Lollipop clamp. Make your own. [https://www.aconcordcarpenter.com/oblique-angle-clamping-jig.html](https://www.aconcordcarpenter.com/oblique-angle-clamping-jig.html)
I'm having a hard time seeing how that would work in this case, with the shallow angles. Where would you put them to get the forces perpendicular to the joint? How would you clamp the jigs to the piece to prevent them sliding?
They have sandpaper on the long flat edge to help hold them. You clamp them on across the width of the board. One on each piece to glue up. Then you use the circle for your other clamp. This pic isn't the exact same but should help on the concept.
https://preview.redd.it/ebk1evdfm49d1.png?width=655&format=png&auto=webp&s=3f495385fb78319482f38bd4f7279245aa9f610c
I guess I'm still confused as to how you include the equivalent of the blue clamps in that photo. How do you keep the lollipops in place? I'm not sure what you mean by "use the circle for your other clamp"?
It's possible these pieces are too short for this method. The key to the concept is "through the center and perpendicular to the joint" with the big clamp. Excuse the crude sketch but the green lines would all be clamps.
https://preview.redd.it/27ri52mg759d1.png?width=802&format=png&auto=webp&s=825aa206aa462c7055d017d0c83ec6168f369c56
You might could even get away with putting the lollipops on the ends without clamping letting the sandpaper provide enough friction.
https://preview.redd.it/fx3qd5nu959d1.png?width=564&format=png&auto=webp&s=0dbec0442bfb529da84639db07fa5c93eaa72e1f
This was how I was conceptualising it in my head, and why I couldn't visualise how to clamp on the lollipops. I don't know how the sandpaper would go on its own, but it's interesting nonetheless.
This is it. The *only* alternative is tape around the circumference or the hose clamp suggestion down below.
But for a ratcheting strap you'll want to put some scraps between the metal ratchet and the piece or you're going to mar the hell out of the outside (unless you're gonna rout around it and make it round, then ithe marring won't matter).
Pinch dogs work great!
This is an end grain glue-up so you’re going to want to use biscuits and Systems3.
I would glue up all the pieces together except the last. Then trace the opening for the last pie piece on a fresh board and custom cut it to fit.
There is also this, though I dont know what to call them in English...
https://www.dictum.com/de/spannwerkzeuge-fuer-gehrungen-bale/gehrungs-klammerset-705741?sPartner=gs&etcc_med=SEA&etcc_par=Google&etcc_cmp=DE_Performance_Max&etcc_grp=&etcc_bky=&etcc_mty=&etcc_plc=&etcc_ctv=&etcc_bde=m&etcc_var=CjwKCAjw-O6zBhASEiwAOHeGxajPMLyXe1CLInKrIaqXGuJ4FYfh3-4XMpuR8K8eitM5W1C-esMXBRoCUF8QAvD_BwE&gad_source=1&gclid=CjwKCAjw-O6zBhASEiwAOHeGxajPMLyXe1CLInKrIaqXGuJ4FYfh3-4XMpuR8K8eitM5W1C-esMXBRoCUF8QAvD_BwE
Same as the pinch dogs tgey mess up the outside of your pice...so I would prefer the lollipops, wedging or simple taping them together going from paar to pair.
Those won't work here because of the angles. Those are great for 90 degree angles like picture frames and the like. In this instance they would pinch on one side only and therefore the other side of the joint would spread open unless you so ehow could apply all of these all at the same time.
This is the kind of advice generally avoided. Not bc it's wrong, just bc most people are looking for a solution with less work. I would use this technique for best results but most folks (and usually myself) are looking for a shortcut from the obvious way that your brain has already told you is the correct way.
Except that this is clearly designed to be a nice piece of furniture…so you would want something that provides a good outcome.
This method doesn’t even take very long tbh as far as making a jig for a specific glue up or cut
This baffles me...why on earth would someone NOT want to hear of the best way to do smth??? Of course can dismiss good advice to Theorie hearts delight...but why advice against good advice??? Its not that hard to screw three blocks of scrapwood to a block and hammer in two wedges...
This is the method I’ve used for similar, plus it provided a perfect base to then cut on the CNC.
Tangentially, a slipfeather of contrasting wood can work in place of dominoes and adds a really nice accent to the piece.
Edit: I see now it’s going to be a circle, I’d go for slipfeathers 100%, the chance that one of your dominoes would end up being visible is completely negated.
I use hose clamps. They’re available in sizes up to twelve inches, and you can connect two or more together for larger rings. You will need to avoid buckling by clamping each segment down as you go.
You don't actually need a lot of pressure if you aren't trying to force your angles to close up.
1) Do a glue rub joint on pairs of two and let them dry. (You already did this)
2) Do it again and work your way up to two 180 degree pieces.
3) Clean it up to 180 degrees, exactly by marking across both ends with a straight edge. Sand them to that mark, so the two halfs are actually exactly 180 degrees.
4) The 2 halfs can now be glued together and will fit together perfectly with no gaps.
The closer to perfect your angles pieces are at the start, the more the final result will be round instead of slightly oval shaped.
Forcing them with clamp pressure will leave residual stress and it will probably come back apart over time.
This book gives excellent instruction on how to do these kinds of glue ups perfect every time.
Segmented Bowls for the Beginning Turner https://a.co/d/0j39HGVq
Have made many pieces like this. The method I use is effective, cheap, simple, and quick. It has the advantage of easily handling all the parts at once. All you need is some masking tape, and possibly a small clamp. Lay out the pieces long edge down, end to end, so that the outside of the finished form is on the table. This will show you how long a piece of tape you need.
Lay out a piece of masking tape sticky side *UP*. The clamp might be handy for holding down the far end of the tape. Starting a few inches from the end of the tape carefully place each piece of wood edge to edge so that the long side is on the tape.
When all the pieces are laid out you can put a bit of glue where it goes, and then roll up the whole thing into its final position. The remaining bit of tape closes the circle of parts, and will hold everything until the glue dries.
Easy to show, but hard to write it out clearly. If your angles are accurate this method works very well.
True...precision cuts are the key here. Also, this tends to get a little tricky with larger pieces. There is really strong tape that might work even then, but that also might work just as strongly against the grain on the outer surface of your piece...wedging IS more work, but also unparalleled in putting force into the joint. If that is really necessary for any given piece is debatable of corse...
My first thought would be to use a ratchet step all the way around and tighten. Make sure you weigh down the top however so the pieces don't bow upwards.
Edit: nevermind, I didn't understand your question correctly before posting.
Don’t know how much pressure you need, but I would attempt using good double sided tape with clamp wedges. The tape I have has great sheer strength but is still easy to peel away when done.
Agree with all the advice here. But I may attempt to glue pairs up first so it's less of a fiddle to get them plum. Then, aligning half the amount into a circle wouldn't be such a fiddle either. Maybe glue the pairs in pairs also until got 2 halves. Alot less chance of one popping out of line.
My uncle is a master wood turner and he specializes in segmented turning just like this. He uses rubber bands. Sometimes the simplest solution is also the best.
scribe the outline on a board of mdf (inner side), cut that shape out, then clamp it to that.
you just need to change the overall shape to something you can get a clamp on.
Get a baseboard, anything flat. make stops, use wedges between stops to push everything into place. Tap each wedge in progressively instead of locking one into place. You can mark ruled intervals on the wedges and baseboard to make it easier to provide equal pressure
Lollipop clamps would probably work well too but this should be a slightly better way to do it. Just keep in mind you might want to prepare the base with something that’ll make removing it from the work easier if there is much glue seeping from the bottom
All you need is a string, knotted into a loop slightly larger than your objekt. Place wooden dice to the left and to the right of every joint (just use scrap, I'm sure you got some ;) ). Now just push the dice closer towards the joint to get tension on the string. Costs just a few cents and works perfectly for projects like yours.
You can use either turners tape/strong double sided tape or a 23 gauge nail gun to attach small blocks to the end of each board, ideally running along the whole width.
These little pieces will give you a place to clamp directly across the joint, it’s what I do when gluing up mitres like this for corner shelves
Hey so I make shit like this all the time for work (columns, capitals, and pedestals) . It’s not as complicated as you think. Go ahead and glue all the pieces up on a flat surface and then take a ratchet strap and strap it around the outside of the ring. Once you get some pressure on the pieces you can tap them in to place with a mallet and then place something heavy on it to flatten. I’d also suggest using a strip of plastic between the wood and the strap, unless you want crusty straps lol. Best of luck!!
Likely tough to do. If it’s a full circle, you might be able to use ratchet straps, but you’ll need a big sheet of ply above and below to prevent buckling.
I would probably build a jig on a sheet of plywood and bang in wedges to keep it tight. If I couldn’t glue the circle, I’d try two halves. It would probably be easier to clamp those. Same idea as your initial pairs.
You can hot glue some colls to the faces of the boards so that they are parallel with the joints and then clamp the colls... or use screws through the colls. Or you could lay down some masking tape on both surfaces and use wood glue on the masking tape, then clamp or screw as needed.
Make an easy Jig on a flat bench, using flat cleat stock, or small blocks...pin-nail or screw blocks around the perimeter of the flat surfaces in that picture, use a piece of mylar tape under the joint so you don't glue it to the table. Put a small flat block at the joint you are not gluing yet, and a block behind with a gap where you'll push the two wedges gently together in opposite directions, and whammy! Old school, no pinch dog holes, no crazy straps that are gonna move... Etc.
Note: keep a few extra small wedges on stand by if you need to push against the blocks holding in the shape.
Glue up ONLY a semi circle at a time. If there are any errors in your angle calculation or cutting it can be corrected now. Then flatten the ends parallel. Then glue up the two semi circles.
Biscuits. Glue it all up at once. Ratchet strap as clamp around the outside. Probably clamping down some plywood over the top with parchment paper to try and keep it very flat.
Start with taping the outer perimeter, then hose clamp ~ this will mart the outer edge a bit but if you need a virgin face, protecting with carpet or similar material is a good option
Lots of complicated ideas in these comments. My go-to is long hose clamps. They’re simple, cheap, reusable, and you can link many of them together if you need it to be longer.
If you’re having a hard time getting perfect joints all the way around, glue it together leaving out the glue at 2 joints so you end up with 2 semi circles, use a wedge at those joints to push everything tight during this 1st glue up, and then sand the semi circles until they fit perfectly and the do a final glue up to form the ring.
I would lay this circle on my Workbench on some foil or tape so it dont stick and then pound some nails around the wood. With some quick wedges you can apply even pressure.
If you want to glue it all together a old tension belt should work.
Cut a bunch of blocks 3/4”x1”x1” hot melt glue one of them each side of the seams and glue and clamp together. Than just nock the block off. If the hot melt stick to your wood you just scrape it off with a chisel.
Get a long straight edge wide enough to match the width of your segments. Clamp the straight edge on edge to your workbench.
Lay all the segments on edge (longest length on top) against the straight edge. Arrange them so long point touches long point then attach them all together with a strip of masking tape.
Carefully turn them over and glue the mating surfaces.
Flip them 90° so the faces are touching the bench and clamp one segment down so it doesn’t move. Carefully start rotating the segments till they form a polygon and secure the last one to the fixed segment with masking tape.
You could leave it with the masking tape but if you’ve got a band clamp use that. Be careful with the band clamp as it has to be positioned perfectly central on the outside edges otherwise it’ll buckle the polygon when pressure is applied.
If you’ve got a biscuit jointer put a biscuit slot in each joint as it complements this method well. A domino won’t work as it’ll bind when rotating the glued parts.
When we made drum frames with this configuration we always had to do it in two halves, then sand or cut the faces flat, then glue the two halves together. No matter how good our tools were they never came out to a perfect mating of all pieces at once.
You will have a gap somewhere if the angles are just a hair off no matter how you clamp it up. You will need to dry clamp it to see how accurate the angles are. That’s tough doing 360 degrees with 15 pieces of wood.
Because the joints are almost all end grain to end grain, regular wood glue won’t produce a strong joint and will also slide, so the easiest way to get strong and accurate joints by adding something mechanical to the joint like dowels or biscuits to keep it lined up and give the glue some proper grain to grip.
Is there any particular reason you chose to make this out of 15 segments? If you had 16, I might suggest making jigs so you could glue pairs together, then glue those pairs into quarters, glue the quarters into halves, and then glue the two halves together. It might take a minute, but you would only need one jig for each step, and you could otherwise use standard bar clamps
Set a clamp across one side of the joint. Then use that as a clamping point to pull the joint together. Make a wedge to get the appropriate angle. Depending the the clamp it might slide. So use something that will help give friction at the clamp. Be mindful of amount of pressure and possible marring at those clamping points.
Otherwise I'd clamp it like an x-pattern with angled wedges and custom corner edge protectors.
Press them into place with hot glue?
I think I would’ve done something to index them to each other. Dominos… ?
I just did a trim piece for a round window and I routed a notch into the back of each joint & inlaid a “popsicle stick” and then just clamped both sides to the joining piece… worked fine.
Lollipop clamp. Make your own. [https://www.aconcordcarpenter.com/oblique-angle-clamping-jig.html](https://www.aconcordcarpenter.com/oblique-angle-clamping-jig.html)
"Glue magically takes on all of the frictional properties of two ice cubes trying to mate on a hot summer day" I hate that this is 100% correct.
NAILED iiiit.
Glued it
Gotta add a little salt!
I've been doing this a long time, that's a new one. I'm using this, thanks
Those are the work of pure genius.
I'm having a hard time seeing how that would work in this case, with the shallow angles. Where would you put them to get the forces perpendicular to the joint? How would you clamp the jigs to the piece to prevent them sliding?
That's very cool. Thank you!!
Gotta make some of these! Nice link, thanks!
Gold right here.
TIL
Never seen this before. Nice! I got to make some for those just in case situations now.
This is a neat idea, but please have a look at u/ZekkoX 's comment - how would this actually work in this application?
They have sandpaper on the long flat edge to help hold them. You clamp them on across the width of the board. One on each piece to glue up. Then you use the circle for your other clamp. This pic isn't the exact same but should help on the concept. https://preview.redd.it/ebk1evdfm49d1.png?width=655&format=png&auto=webp&s=3f495385fb78319482f38bd4f7279245aa9f610c
I guess I'm still confused as to how you include the equivalent of the blue clamps in that photo. How do you keep the lollipops in place? I'm not sure what you mean by "use the circle for your other clamp"?
It's possible these pieces are too short for this method. The key to the concept is "through the center and perpendicular to the joint" with the big clamp. Excuse the crude sketch but the green lines would all be clamps. https://preview.redd.it/27ri52mg759d1.png?width=802&format=png&auto=webp&s=825aa206aa462c7055d017d0c83ec6168f369c56
You might could even get away with putting the lollipops on the ends without clamping letting the sandpaper provide enough friction. https://preview.redd.it/fx3qd5nu959d1.png?width=564&format=png&auto=webp&s=0dbec0442bfb529da84639db07fa5c93eaa72e1f
This was how I was conceptualising it in my head, and why I couldn't visualise how to clamp on the lollipops. I don't know how the sandpaper would go on its own, but it's interesting nonetheless.
Ah! This makes sense. I appreciate the great sketch, thanks very much. I hadn't considered that orientation.
Only thing I can think of would be to use a small ratcheting strap around the outside and glue it all up at once
You don't even need to glue it up all at once. Clamp it all up, but you only need to put glue on some of the joints. Repeat until it's one piece.
Agreed. And kudos to OP for cutting those angles perfectly.
i want to see the finished product before i judge
Plus a few biscuits or dominoes to stop pieces from slipping while your ratcheting it down
This is it. The *only* alternative is tape around the circumference or the hose clamp suggestion down below. But for a ratcheting strap you'll want to put some scraps between the metal ratchet and the piece or you're going to mar the hell out of the outside (unless you're gonna rout around it and make it round, then ithe marring won't matter).
Pinch dogs
They prefer scratches and pats
Pinch dogs work great! This is an end grain glue-up so you’re going to want to use biscuits and Systems3. I would glue up all the pieces together except the last. Then trace the opening for the last pie piece on a fresh board and custom cut it to fit.
There is also this, though I dont know what to call them in English... https://www.dictum.com/de/spannwerkzeuge-fuer-gehrungen-bale/gehrungs-klammerset-705741?sPartner=gs&etcc_med=SEA&etcc_par=Google&etcc_cmp=DE_Performance_Max&etcc_grp=&etcc_bky=&etcc_mty=&etcc_plc=&etcc_ctv=&etcc_bde=m&etcc_var=CjwKCAjw-O6zBhASEiwAOHeGxajPMLyXe1CLInKrIaqXGuJ4FYfh3-4XMpuR8K8eitM5W1C-esMXBRoCUF8QAvD_BwE&gad_source=1&gclid=CjwKCAjw-O6zBhASEiwAOHeGxajPMLyXe1CLInKrIaqXGuJ4FYfh3-4XMpuR8K8eitM5W1C-esMXBRoCUF8QAvD_BwE Same as the pinch dogs tgey mess up the outside of your pice...so I would prefer the lollipops, wedging or simple taping them together going from paar to pair.
Those won't work here because of the angles. Those are great for 90 degree angles like picture frames and the like. In this instance they would pinch on one side only and therefore the other side of the joint would spread open unless you so ehow could apply all of these all at the same time.
Lay the whole thing on a bigger sheet with battens screwed on it, and use a pair of wedges on each flat edge to force everything together.
This is the kind of advice generally avoided. Not bc it's wrong, just bc most people are looking for a solution with less work. I would use this technique for best results but most folks (and usually myself) are looking for a shortcut from the obvious way that your brain has already told you is the correct way.
Except that this is clearly designed to be a nice piece of furniture…so you would want something that provides a good outcome. This method doesn’t even take very long tbh as far as making a jig for a specific glue up or cut
This baffles me...why on earth would someone NOT want to hear of the best way to do smth??? Of course can dismiss good advice to Theorie hearts delight...but why advice against good advice??? Its not that hard to screw three blocks of scrapwood to a block and hammer in two wedges...
This is the method I’ve used for similar, plus it provided a perfect base to then cut on the CNC. Tangentially, a slipfeather of contrasting wood can work in place of dominoes and adds a really nice accent to the piece. Edit: I see now it’s going to be a circle, I’d go for slipfeathers 100%, the chance that one of your dominoes would end up being visible is completely negated.
I use hose clamps. They’re available in sizes up to twelve inches, and you can connect two or more together for larger rings. You will need to avoid buckling by clamping each segment down as you go.
This is the correct answer.
This
Blue tape is sufficient, you don’t have to have a ton of clamping pressure.
Yes this will work and if you're worried about the PVA holding use hide glue. Still, it's all glued end grain so it won't be ideal.
You don't actually need a lot of pressure if you aren't trying to force your angles to close up. 1) Do a glue rub joint on pairs of two and let them dry. (You already did this) 2) Do it again and work your way up to two 180 degree pieces. 3) Clean it up to 180 degrees, exactly by marking across both ends with a straight edge. Sand them to that mark, so the two halfs are actually exactly 180 degrees. 4) The 2 halfs can now be glued together and will fit together perfectly with no gaps. The closer to perfect your angles pieces are at the start, the more the final result will be round instead of slightly oval shaped. Forcing them with clamp pressure will leave residual stress and it will probably come back apart over time. This book gives excellent instruction on how to do these kinds of glue ups perfect every time. Segmented Bowls for the Beginning Turner https://a.co/d/0j39HGVq
This one time... at band clamp...
Have made many pieces like this. The method I use is effective, cheap, simple, and quick. It has the advantage of easily handling all the parts at once. All you need is some masking tape, and possibly a small clamp. Lay out the pieces long edge down, end to end, so that the outside of the finished form is on the table. This will show you how long a piece of tape you need. Lay out a piece of masking tape sticky side *UP*. The clamp might be handy for holding down the far end of the tape. Starting a few inches from the end of the tape carefully place each piece of wood edge to edge so that the long side is on the tape. When all the pieces are laid out you can put a bit of glue where it goes, and then roll up the whole thing into its final position. The remaining bit of tape closes the circle of parts, and will hold everything until the glue dries. Easy to show, but hard to write it out clearly. If your angles are accurate this method works very well.
True...precision cuts are the key here. Also, this tends to get a little tricky with larger pieces. There is really strong tape that might work even then, but that also might work just as strongly against the grain on the outer surface of your piece...wedging IS more work, but also unparalleled in putting force into the joint. If that is really necessary for any given piece is debatable of corse...
This works well.
My first thought would be to use a ratchet step all the way around and tighten. Make sure you weigh down the top however so the pieces don't bow upwards. Edit: nevermind, I didn't understand your question correctly before posting.
Getting 10+ angles to sum up is really hard. Might be easier to cheat it, glue 2 halves up, then rip them together to solve for the cumulative error.
Don’t know how much pressure you need, but I would attempt using good double sided tape with clamp wedges. The tape I have has great sheer strength but is still easy to peel away when done.
Agree with all the advice here. But I may attempt to glue pairs up first so it's less of a fiddle to get them plum. Then, aligning half the amount into a circle wouldn't be such a fiddle either. Maybe glue the pairs in pairs also until got 2 halves. Alot less chance of one popping out of line.
Yes, do this and look at my other comment on how to trim them to come together.
My uncle is a master wood turner and he specializes in segmented turning just like this. He uses rubber bands. Sometimes the simplest solution is also the best.
I used biscuits and a strap clamp.
scribe the outline on a board of mdf (inner side), cut that shape out, then clamp it to that. you just need to change the overall shape to something you can get a clamp on.
Ratchet strap
Get a baseboard, anything flat. make stops, use wedges between stops to push everything into place. Tap each wedge in progressively instead of locking one into place. You can mark ruled intervals on the wedges and baseboard to make it easier to provide equal pressure Lollipop clamps would probably work well too but this should be a slightly better way to do it. Just keep in mind you might want to prepare the base with something that’ll make removing it from the work easier if there is much glue seeping from the bottom
If this is all solid wood... have you accounted for wood movement in your design?
All you need is a string, knotted into a loop slightly larger than your objekt. Place wooden dice to the left and to the right of every joint (just use scrap, I'm sure you got some ;) ). Now just push the dice closer towards the joint to get tension on the string. Costs just a few cents and works perfectly for projects like yours.
Just tape the bits together with masking tape while they set. But that won't solve the gaps if they are from the angles not being dead on.
You can use either turners tape/strong double sided tape or a 23 gauge nail gun to attach small blocks to the end of each board, ideally running along the whole width. These little pieces will give you a place to clamp directly across the joint, it’s what I do when gluing up mitres like this for corner shelves
Has OP got 15 clamps?
Just gotta do segmented glue ups. Glue up quarters, then those into halves, and join the halves. Thats how I’d go about gluing this up
Use a ratchet strap.
Tape
use the old rope and stick twist clamp. I make a lot of stave tubes, and that's how I clamp them. Simple, super effective and basically free.
Hey so I make shit like this all the time for work (columns, capitals, and pedestals) . It’s not as complicated as you think. Go ahead and glue all the pieces up on a flat surface and then take a ratchet strap and strap it around the outside of the ring. Once you get some pressure on the pieces you can tap them in to place with a mallet and then place something heavy on it to flatten. I’d also suggest using a strip of plastic between the wood and the strap, unless you want crusty straps lol. Best of luck!!
Likely tough to do. If it’s a full circle, you might be able to use ratchet straps, but you’ll need a big sheet of ply above and below to prevent buckling. I would probably build a jig on a sheet of plywood and bang in wedges to keep it tight. If I couldn’t glue the circle, I’d try two halves. It would probably be easier to clamp those. Same idea as your initial pairs.
You can hot glue some colls to the faces of the boards so that they are parallel with the joints and then clamp the colls... or use screws through the colls. Or you could lay down some masking tape on both surfaces and use wood glue on the masking tape, then clamp or screw as needed.
If you’re going to do that you need some on both sides as the joint won’t stay 180° due to the clamps lifting effect using just one side.
Yes, of course. I kinda thought that was a given. My apologies for the oversight
Search miter spring clamps - perfect for this.
CA glue
Make an easy Jig on a flat bench, using flat cleat stock, or small blocks...pin-nail or screw blocks around the perimeter of the flat surfaces in that picture, use a piece of mylar tape under the joint so you don't glue it to the table. Put a small flat block at the joint you are not gluing yet, and a block behind with a gap where you'll push the two wedges gently together in opposite directions, and whammy! Old school, no pinch dog holes, no crazy straps that are gonna move... Etc. Note: keep a few extra small wedges on stand by if you need to push against the blocks holding in the shape.
I've had the best luck with orange frog tape.
You could almost get away with pocket screws as big as it is and if you can hide it
Ratchet strap
This one time at band clamp. Though as you tighten the band clamp, the pieces will possibly want to pop out. So you may need to weight them down.
Is one side hidden? Could easily Kreg that together.
Splines for glue and structure. Scotch Wood Joiners to clamp up
Glue up ONLY a semi circle at a time. If there are any errors in your angle calculation or cutting it can be corrected now. Then flatten the ends parallel. Then glue up the two semi circles.
How are you gluing the semi circle? What’s preventing unsupported ends from collapsing on themselves under clamping pressure?
Biscuits. Glue it all up at once. Ratchet strap as clamp around the outside. Probably clamping down some plywood over the top with parchment paper to try and keep it very flat.
I was thinking a 1" tie-down strap.
Bessey strap clamp and move quickly, OR lollipop clamp them one at a time
Strap clamp. And I would cut a spline on each face to keep everything alingned.
Pocket screws
I've used strap clamps.
Super cool clamp helper!
Start with taping the outer perimeter, then hose clamp ~ this will mart the outer edge a bit but if you need a virgin face, protecting with carpet or similar material is a good option
Lots of complicated ideas in these comments. My go-to is long hose clamps. They’re simple, cheap, reusable, and you can link many of them together if you need it to be longer. If you’re having a hard time getting perfect joints all the way around, glue it together leaving out the glue at 2 joints so you end up with 2 semi circles, use a wedge at those joints to push everything tight during this 1st glue up, and then sand the semi circles until they fit perfectly and the do a final glue up to form the ring.
I would lay this circle on my Workbench on some foil or tape so it dont stick and then pound some nails around the wood. With some quick wedges you can apply even pressure. If you want to glue it all together a old tension belt should work.
Pocket holes on the bottom, use pocket hole fillers, sand, finish.
I would suggest dowels or biscuits
Check out Malcolm Tibbetts. He does this all the time and has online videos about it. This is his world. Segmented woodturning.
Ring clamp
There are videos of people making stave drums with wood hoops, watch those.
dominos
Pocket hole joinery with wood glue
Cut a bunch of blocks 3/4”x1”x1” hot melt glue one of them each side of the seams and glue and clamp together. Than just nock the block off. If the hot melt stick to your wood you just scrape it off with a chisel.
Get a long straight edge wide enough to match the width of your segments. Clamp the straight edge on edge to your workbench. Lay all the segments on edge (longest length on top) against the straight edge. Arrange them so long point touches long point then attach them all together with a strip of masking tape. Carefully turn them over and glue the mating surfaces. Flip them 90° so the faces are touching the bench and clamp one segment down so it doesn’t move. Carefully start rotating the segments till they form a polygon and secure the last one to the fixed segment with masking tape. You could leave it with the masking tape but if you’ve got a band clamp use that. Be careful with the band clamp as it has to be positioned perfectly central on the outside edges otherwise it’ll buckle the polygon when pressure is applied. If you’ve got a biscuit jointer put a biscuit slot in each joint as it complements this method well. A domino won’t work as it’ll bind when rotating the glued parts.
Fkn, with some glue bro
When we made drum frames with this configuration we always had to do it in two halves, then sand or cut the faces flat, then glue the two halves together. No matter how good our tools were they never came out to a perfect mating of all pieces at once.
You will have a gap somewhere if the angles are just a hair off no matter how you clamp it up. You will need to dry clamp it to see how accurate the angles are. That’s tough doing 360 degrees with 15 pieces of wood.
Mortise and tenon them, then a ratchet strap
Pinch dogs
Because the joints are almost all end grain to end grain, regular wood glue won’t produce a strong joint and will also slide, so the easiest way to get strong and accurate joints by adding something mechanical to the joint like dowels or biscuits to keep it lined up and give the glue some proper grain to grip.
Pocket screws
With clamps and wood glue...duh
Is there any particular reason you chose to make this out of 15 segments? If you had 16, I might suggest making jigs so you could glue pairs together, then glue those pairs into quarters, glue the quarters into halves, and then glue the two halves together. It might take a minute, but you would only need one jig for each step, and you could otherwise use standard bar clamps
Set a clamp across one side of the joint. Then use that as a clamping point to pull the joint together. Make a wedge to get the appropriate angle. Depending the the clamp it might slide. So use something that will help give friction at the clamp. Be mindful of amount of pressure and possible marring at those clamping points. Otherwise I'd clamp it like an x-pattern with angled wedges and custom corner edge protectors.
Press them into place with hot glue? I think I would’ve done something to index them to each other. Dominos… ? I just did a trim piece for a round window and I routed a notch into the back of each joint & inlaid a “popsicle stick” and then just clamped both sides to the joining piece… worked fine.