2'x2' piece of standard B/C 1/2" plywood from Home Depot. You might want a bigger piece if you have a bigger lathe. I cut it into 4x 1'x1' pieces. Glued them back to back, then cut the corners off on the bandsaw. I attached my lathe faceplate to the center and then rounded it on the lathe. I brought it to a diameter that would give me an extra 10mm or so. I worked it so that the front didn't wobble and then drilled and tapped it for my lathe (1" x 8 TPI). I turned a small shoulder and then turned the rest so that it was tapered. I reinforced the threading with thin CA and retapped a few times applying CA each time. Then I mounted it on the lathe with the faceplate off and made a slight taper from the center on the face side. Sanded the whole thing just so I wouldn't get any splinters and used a little bit of CA to help.
Bought a bunch of white "Foamies" brand foam sheets from a local craft store. Each is 2mm. Using spray adhesive I glued each both to the face of the plywood, and hand-molded it around the edges. I did this repeatedly, gluing and molding sheet after sheet, until there was ~10mm worth of foam on the face and edges. Last step was making a piece to enclose the edges, which was just a lot of cutting and gluing.
Tried it on 2 pieces today and it works just as well as I had hoped. I just jam the workpiece up against it in reverse and use the tailstock to hold it in place and then it's held in place well enough for me to finish the bottom. Total cost was $6.50 for the wood, under $10 for the foam, and a couple dollars worth of glue.
Bought a bunch of white "Foamies" brand foam sheets from a local craft store. Each is 2mm. Using spray adhesive I glued each both to the face of the plywood, and hand-molded it around the edges. I did this repeatedly, gluing and molding sheet after sheet, until there was ~10mm worth of foam on the face and edges. Last step was making a piece to enclose the edges, which was just a lot of cutting and gluing.
Tried it on 2 pieces today and it works just as well as I had hoped. I just jam the workpiece up against it in reverse and use the tailstock to hold it in place and then it's held in place well enough for me to finish the bottom. Total cost was $6.50 for the wood, under $10 for the foam, and a couple dollars worth of glue.
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