deandome
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- Joined
- Jan 19, 2009
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Finishing an old PML Matrix Kit...got a 3" phenolic av-bay kit for DD. I'm about to drill screws to attach bay to payload section, but wondering if using the 4/40 size PEM nuts & screws...like I do in my smaller fiberglass kits...is best way to go?
- are those screws too thin, and maybe likely to either rip thru the tube, or maybe pull the PEMs thru the tube if apogee deployment is a bit late?
- would bigger screws be better, or worse?
- when drilling QT, is plain drilling the best way, or would drilling a bit smaller than required & then widening hole with a heated awl or whatnot be better? Thinking here is that melting the edge of hole might make it stronger/reduce stresses
- or should I just use plastic rivets for this?
- similar/same questions for rail-guide holes, though I'm thinking a flanged T-nut will be better than a PEM nut; more surface area 'grabbing' the BT
