[roc-chat] Re: E-bay machine screw ?
- From: Allen H Farrington <allen.farrington@xxxxxx>
- To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
- Date: Sat, 28 May 2011 10:04:23 -0700
I do this all the time. Just make sure that the backing for the screws is
sound.
Allen
Terseness and mis-spelling courtesy of my iPhone
On May 28, 2011, at 8:47 AM, John Howard <John.Howard@xxxxxxxxxxxxxx> wrote:
> Hi All,
>
> I've been a ROC member for a couple years and lurking on roc-chat for about
> the same. I am finishing a 4” fiberglass Madcow Nike Smoke for NSL/ ROCstock
> and have a hardware question.
>
> The Nike is one of two L2 rockets I am bringing with the hope of dong my L2
> Cert flight. I have split the airframe in half and added an electronics bay
> built from a fiberglass coupler tube. I am hoping to connect it all together
> with machine screws. To load the ejection charge, I’ll unscrew the upper
> airframe, load them, then re-attach. The charge will eject the parachute out
> with the nosecone. Everything is built and ready to paint. I have drilled 8
> pilot holes to mount the coupler tube to the bottom half, and four for the
> upper half.
>
> Do you think 4-40 machine screws will be strong enough, or should I use 6-32?
>
> Looking on the web, it looks like 4-40 screws would have enough strength,
> plus there will be 8 on the bottom screwed into standoffs/nuts. I could also
> epoxy the E-bay in, but I also have a open coupler tube with the same pilot
> holes so I could launch the rocket with a motor and motor ejection charge.
> The “keep it simple stupid” version.
>
> Thanks ahead of time, and see you in two weeks!
>
> John Howard
>
>
>
> Sent from my iThing
Other related posts:
