I have been wanting to get back into open segment turnings again, hence a jig was needed. This jig in theory is to assist in gluing the segments in a proper position to create a equal spacing between the wedges.
The jig was mostly scraps that I had in the shop, plus the hardware and the large circular protractor (found that on online). Started with the base using 3/4" plywood and added 2 layers between the base and the top of the turn table. they are all connected with a 2" diameter post so the turn table will spin easily and stay flat.
The mechanism for the indexing included a block with a bar installed on it that rides on the post in the corner, along with a small stop block on the bar. Both have thumb screws to lock in position. The bar does go to the center of the jig. I also incorporated a clamping system into the build, this consist of vertical supports on the sides with a cross-piece with hanger bolts that slide in a slot within the supports. Also there is a circular plate attached to the bottom to cover all of the wedges needing pressure during the drying. Just slide the plate down after removing the bar and lock in place.
In theory: the jig works like this, set the bar just above the ring being glued to, then set the stop block on the bar to the outside of the wedge being glued. Place the wedge in the corner of the bar and stop block, spin the turn table counterclockwise to the next angle to glue the next block in place. Once back at the start, remove the bar and slide the clamping plate in place and lock down. THen repeat for each additional layer.
And turned for the next block.
This should work well for gluing the segments, and it can be used to clamp rings together also.
There is a build blog with more details of the construction. https://craftisian.com/entries/1925-getting-started
Thanks for looking and comments are always welcome and appreciated.
Pottz. thanks. that is the principle, except you start from the base and work up. I had a ring I messed up on a while back, and some wedges that I hope to use one day. But I wanted to show folks the basics.
ok thanks i had it backwards. but it seems to me youd want to start with the widest ring first for stability in the glue up ? so could you do it that way ?
working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.
Never thought about it that way, but I guess one could start with the top ring. I will have to experiment a little with this. I did size this for the max on my lathe, although I don't think I will ever take it that far, about 12" diameter is about as large as I would like to turn. Things start to get a little shaky.
I don’t know that it matters which way you stack the rings, unless you were trying to make a very thin walled, very flat bowl, then there could be issues…
Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".
This Segment Gluing Jig is well made with a lot of precision and forethought into its intended use. I am awaiting the post of your first project using this to see the final product.
Ron, thanks. I was looking for accuracy for the glue ups.
Jim, thanks. I sat at the bench messing around with a few blocks drinking my coffee thinking how this should work. The first item was the post to hold the bar in place. I think it will do the job that I intended.
