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DIY 3D printed foil

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SaulOhio
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Re: DIY 3D printed foil

Postby SaulOhio » Mon Aug 17, 2020 1:51 pm

I'm working on my first 3d printed stabilizer. My machine isn't big enough to do a full wing, and I'm even printing the stab in 6 parts. Just finished printing up the first section this morning. It seemed to take about 50% longer than the software predicted. PLA and its going to be covered in carbon. So far I've only made molds with my CNC machine and laid up carbon. Any tips on getting the carbon fiber to stay close on the leading edge while under vacuum? I want to wrap is close so the carbon cloth is continuous from the top to bottom sides.

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Re: DIY 3D printed foil

Postby rynhardt » Mon Aug 17, 2020 2:07 pm

I know this isn't what you're asking, but is there any particular reason you need the carbon to be continuous across the edge? There's no real structural benefit.
I'd do the top and bottom with the fabric flat in the moulds and then trim and sand the edges once the moulds are removed.
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fluidity
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Re: DIY 3D printed foil

Postby fluidity » Tue Aug 18, 2020 6:17 am

SaulOhio wrote:
Mon Aug 17, 2020 1:51 pm
I'm working on my first 3d printed stabilizer. My machine isn't big enough to do a full wing, and I'm even printing the stab in 6 parts. Just finished printing up the first section this morning. It seemed to take about 50% longer than the software predicted. PLA and its going to be covered in carbon. So far I've only made molds with my CNC machine and laid up carbon. Any tips on getting the carbon fiber to stay close on the leading edge while under vacuum? I want to wrap is close so the carbon cloth is continuous from the top to bottom sides.
I worked the weave so that the fabric was tight around the front and then hand sewed the trailing edges together. Best to start from the centre and stitch out to the sides to keep it symmetrical. Some people use a light spray of of tacky placement glue. I would recommend preparing some stiff sheet and clamps to apply around the vacuum layers around the trailing edge to keep the unsupported excess tapered and in-line.

Alternatively you can use composite fabric sleeving, sollercomposites has a great range. Be sure to check the flat, minimum and maximum diameters though to match to your wings.
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Re: DIY 3D printed foil

Postby atomic-chomik » Tue Aug 18, 2020 6:43 am

Use electrical tape to lay carbon fibers down around complex curves or rounded areas.

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Re: DIY 3D printed foil

Postby fluidity » Wed Aug 19, 2020 6:57 am

atomic-chomik wrote:
Tue Aug 18, 2020 6:43 am
Use electrical tape to lay carbon fibers down around complex curves or rounded areas.
I've tried industrial electrical tape in the past with bad results. Maybe the wider hobby rolls could work so long as the stickiness doesn't transfer(expecially under curing heat) to the piece you are working on.

I do use masking tape sometimes though. There is a sweet spot after the piece has partially cured but before it's fully cured where you can peel it off successfully and the stickiness stays on the masking tape. It's thin so the overlaps make only small ridges from the height difference as one wrap lies over the top of the next.

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Re: DIY 3D printed foil

Postby atomic-chomik » Thu Aug 20, 2020 5:59 am

Regarding the electrical tape, give it a twist so its the sticky side out - Critical piece there.

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Re: DIY 3D printed foil

Postby atomic-chomik » Thu Aug 20, 2020 6:01 am

Regarding the electrical tape, give it a twist so its the sticky side out - Critical piece there.


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