compound miter glue up jig

Re: compound miter glue up jig

Mike Stafford

I do my compound miter glue up using 3M Stretchable tape #8884. It allows you to secure segments with the adhesive and pull the tape tight which squeezes the joints together.

It really works well. Sometimes you wish you had a second set of hands. On larger assemblies I find it easier to do sub-assembly glue ups as you show and then put them together using the stretchable tape.

Re: compound miter glue up jig

john lucas

Mike I tried stretch wrap. It was hard to get the pressure right. Close some and then some came open while I was trying to get more pressure. I did manage to get them all glue up and finished the Urn but decided there had to be a better way.

With this jig I'm thinking I might need some weight on the top of the joint but it's a balancing act between pressure on the sides and pressure on the top to keep the joint closed. I need to find a better tape than the blue tape. This tape comes off too easily.

Re: compound miter glue up jig

Barry Irby

John, I did a couple of compound miter glue ups. (Bird houses and their roofs) I used hose clamps. Bought some bigger ones that would go on stuff 8" or more. The things I made were being turned later. I cut little "flats" on them to give the clamps something to bite onto and not slip. Laid the pieces with the outside up and taped the joints with blue tape. Turned the assembly over and glued the joints and rolled them up. Taped the last joint and installed the clamps top and bottom and tightened them. Worked well. Easy after you did one or two. Two or three extra hands would help.

I find it interesting that you can just add the hose clamps together. Two four inch ones will fit on and eight inch cylinder.

Not stretch wrap...

Mike Stafford

The product I use is stretch tape as I wrote in my original post. It has adhesive on the tape and sticks to the wood as you pull it around the assembly. Once the tape is in place it tries to shrink back to original size but the stickiness of the tape holds it in place and you get tremendous clamping power.

Have never had an assembled blank come apart using this method.

Re: compound miter glue up jig

john lucas

Hose clamps work fine on straight staves (I've made several of those birdhouses). On compound mitered staves you are trying to clamp a cone. They just slip off.

Re: compound miter glue up jig

Barry Irby

You are correct. I cut a notch in the corners of each piece at a given Altitude. A chisel or sharp pocket knife will do it nicely. Little "flats" on the big end will do it too.

Re: Not stretch wrap...

Gary clarke

Malcolm Tibbetts uses 1/4 inch elastic bands. I have used his method several times and found it quite easy. You might try it before you go to the work of making a jig. It is in his book and on one of his videos.

Re: Not stretch wrap...

john lucas

Is he gluing tapered staves using the elastic bands? I suppose if there is enough friction they might work although I would think the angled pressure would make the glue joint slip.

stretch tape

John K Jordan

The stretch tape sounded useful for several things. I ordered some from Amazon to try:

https://www.amazon.com/gp/product/B0006UZ4NW

JKJ

Re: compound miter glue up jig

Joanne in Point Pleasant, PA

I have no new suggestion for such a difficult glue-up, but I wanted to compliment you on your cool jig invention! That would be a useful jig for many purposes. Thanks for sharing and I am sorry for your loss. Many of the tools in my shop were my Dad's. As much as I miss him, I feel he is always present out there with me.

Re: stretch tape

Mike Stafford

I learned about the stretch adhesive tape from Don Russell who has taught staved segmented construction turning classes at John C. Campbell for years. He worked at 3M and knows all about all kinds of great products that turners can use.

I have used the tape for assembly of staved bowls and urns for almost 12 years.

Re: Not stretch wrap...

Gary clarke

Yes, he has a way to apply the bands by stretching them to the inside of a half ring. After the half rings are dry he sands them on a disk sander and then glues 2 halves together. His video shows this better than I can describe the process.

+1 on this

ebd

Exactly what I do for my segmented rings. You can make any size, no matter how large by daisy chaining multiple hose clamps. Also, tightening is easy and fast using a small drill with a socket fitting the hose clamp nut. I glue them up on a glass plate to insure flatness. Makes no difference how many segments are in the circle. Just tighten it up carefully and you are good to go.

Re: compound miter glue up jig

eliot feldman

Here's how I do it:

Turn a cone shape of the size and angle you need.

Cut your angled segments and glue onto each a couple of little wedges that will have a vertical outer edge when they are arranged around the upright cone.

Wrap whatever you want around the wedges when you glue-up.