Vacuum tooling for composite construction

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Aquaman33
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Re: Vacuum tooling for composite construction

Postby Aquaman33 » Tue Aug 04, 2020 12:41 am

strud wrote:Hey Drew, sound good


Wet sanded the fins last night, a little more to go maybe but pretty close now

Image

Contemplating the wet epoxy wipe process rather than too much more sanding into the carbon or painting, will just need a good way to support the fins while drying.....


Looking great!

To support the fins I use 2 strips on wood that are screwed together with a thin plywood spacer between them at either end. This creates a channel that you slot the fin tabs into. Typically I mask the fin tabs to protect them from the finish, so the epoxy fillets can bond to the raw carbon.

Not a great picture, but hopefully you get the idea:
Image

strud
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Re: Vacuum tooling for composite construction

Postby strud » Fri Aug 21, 2020 8:29 am

Fins attached to rear end of HPV4PoC, just root fillets in place with final fillets and carbon stiffening overlay to come.

Image


Image


Fin jig was routed on mill with rotary table

Image

Aquaman33
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Re: Vacuum tooling for composite construction

Postby Aquaman33 » Fri Aug 21, 2020 10:16 am

Looks great.

That is a serious fin alignment jig. Love it.

Jim-K
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Re: Vacuum tooling for composite construction

Postby Jim-K » Fri Aug 21, 2020 11:17 am

Out of interest, did you cut slots in the outer shell or bond the fins to the outer surface?

strud
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Re: Vacuum tooling for composite construction

Postby strud » Fri Aug 21, 2020 1:26 pm

Hi Jim-k

Surface mounted. I will be putting carbon over the top of the fillets when done so I'm comfortable the attachment will be robust and very stiff.

The tube assembly is quite stiff, being 2mm thick glass outer tube and 1.6mm wall thickness carbon inner tube with ply spacer rings.

Image

Image

drew
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Re: Vacuum tooling for composite construction

Postby drew » Fri Aug 21, 2020 7:47 pm

I love your use of the metal tubing to ensure your threaded rods for the fin alignment guide are equal length. I'm going to have to steal that technique!
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markf74
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Re: Vacuum tooling for composite construction

Postby markf74 » Mon Aug 24, 2020 7:14 pm

Love that Fin jig , got make me one of those

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CATO
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Re: Vacuum tooling for composite construction

Postby CATO » Sun Sep 27, 2020 8:06 am

Nice...
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