Internal pressure on a cylindrical mould
Internal pressure on a cylindrical mould
(OP)
Hello,
Can anyone explain the way this system works. Thanks
Can anyone explain the way this system works. Thanks
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Internal pressure on a cylindrical mould
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RE: Internal pressure on a cylindrical mould
B.E.
RE: Internal pressure on a cylindrical mould
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
RE: Internal pressure on a cylindrical mould
- where you got the image.
- what you are actually trying to do.
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
The image is from a drum company. I build drum shells (musical instruments) I have a 13.75 id steel mould .Basically it is a pipe 13.75 ID by 18" depth. You place veneers in usually 2-3 plies,glue between them to form the shell. So the part in the picture is the internal pressure system.What I need to do is put pressure on the inside of the shell as it dries.I have 4 equal plates and need the best way to press out the inner plates.
Thanks Brian
RE: Internal pressure on a cylindrical mould
RE: Internal pressure on a cylindrical mould
The mechanical expansion mechanism shown in your first image is probably a little safer. The radial links between the core 'star' and the shoes appear to be toggle links. I.e., they are just a little too long to fit nicely in the space, and the screw bears against something to move the 'star' axially and push the links into more nearly radial positions.
Google 'toggle linkage' for help with that.
Note: I'm not completely sure that the image actually does depict a quad toggle mechanism; that's just my best guess from what I can see.
Rather than trying to analyze the linkage, which is possible if your geometry is well known and consistent, it might be advisable to make the toggle links of adjustable length.
The quick and dirty way is a bucket of vise-grips, which also contain a toggle lock mechanism.
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
The extended shank on the central screw suggests that it is used to support the assembly in v-blocks while it is rotated. There is no need for such a feature if the shell is built from the outside in.
Which further suggests that the assembly comprising four sector shoes and a centralizer linkage is not a clamp, but a collapsible mandrel, upon which the drum shell is built from the inside out. The penultimate step would include wrapping the shell exterior with a band of thin metal, retained by a bunch of big hose clamps, and baking the adhesive, e.g. in a pot furnace as appears to be taking place in your first image.
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
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It's much easier to build a laminated shell from inside out over a mandrel than to build it outside-in within a tube, but if that's what you want to do, it's clearly possible.
Mike Halloran
Pembroke Pines, FL, USA
RE: Internal pressure on a cylindrical mould
RE: Internal pressure on a cylindrical mould