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stator mold | 14 comments (14 topical, editorial)

Re: stator mold (3.00 / 0) (#2)
by oregon wind on Mon Jul 21st, 2008 at 09:32:27 AM MST
(User Info)

Hi Dan, thanks for your response.

I have made a few stators using plywood. Works well, but I would like something more durable.

At the Guemes Island workshop last year I liked your HDPE molds.

I called the local plastic company, and they want $330 a sheet for 1/2" HDPE.

I was thinking of maybe making the mold from steel instead. I have some here.

Do you see any problems with this idea?

Thanks

[ Parent ]

Re: stator mold (3.00 / 0) (#4)
by DanB (danb@*no spam*otherpower.com) on Mon Jul 21st, 2008 at 03:53:06 PM MST
(User Info) http://www.otherpower.com/

you shouldn't need a full sheet really. Even a bit of thin stuff to line a plywood mold on the bottom and top would be good, and ifyou're really picky then get some half inch stuff for the sides.
If you make the mold out of HDPE only - it will warp over time. We've wound up bolting ours to some very thick partical board (from a solid door) to keep it flat.

[ Parent ]

Re: stator mold (3.00 / 0) (#10)
by Flux on Tue Jul 22nd, 2008 at 01:21:31 AM MST
(User Info)

Steel can be used for moulds but the surface finish would need to be good and you would need to include a reasonable "draw" angle. A flash of nickel or chrome plate would help considerably.

Unless you are going into large scale production I can't see it being worthwhile.

Polyester virtually sticks to nothing and will be easy. I have no experience of vinyl ester but it shares many properties with epoxy. From experiences at work years ago, epoxy released well from cold moulds as long as the surface finish was near perfect. WE had need to hot mould some epoxy items and these were a real pain to release especially on new moulds. In desperation we heated some of the moulds to blueing temperature and the oxide formed helped considerably.

Flux

[ Parent ]

stator mold | 14 comments (14 topical, 0 editorial)

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