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November 29, 2020, 13:17:03 pm

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21
RC Flight Chatter / Re: Making Self Tappers into P...
Last post by pooh - November 21, 2020, 12:34:50 pm
I can't find the item I wanted to show, I've used them in the past for exactly the sort of job you want. The version I have used is a partially split brass cylinder with a rough outside (sharp points) and a female thread ending with a brass disc which is only partially down inside the inner - as you screw into the thread (with a screw!) it pushes the disc further down the inner, which forces the split cylinder to push hard against the plastic hole.

I bought these from one or more of my usual electronics suppliers (my day job is electronics) but I'm blowed if I can find them in RS Components or RapidOnline, largely because I can't work out how to describe them to the search engine!

these guys may be able to help


https://www.insertsdirect.com/acatalog/Small-Quantities-1.html
22
RC Flight Chatter / Re: Making Self Tappers into P...
Last post by e-flite_rules - November 21, 2020, 11:51:18 am
Maybe take a short countersunk M3 bolt and then drill and tap an M1.6 thread into it coaxial with the main thread?  Epoxy the bolt into an M3 countersunk and tapped hole in the plastic and then use a spring washer, plus plain washer, under an M1.6 bolt to provide a shake proof joint?

Or even use a countersunk #3 or 4 self tapper?  Do such things exist?

What do you think?

23
RC Flight Chatter / Making Self Tappers into Plast...
Last post by e-flite_rules - November 21, 2020, 11:35:20 am
Using self tapping screws to fasten together plastic items typically works fine.  That is until one tries to make and unmake the joint multiple times.  Sooner or later the thread strips and the clamping load drops to zero.  Not good if the joint is holding a wing in place!

I typically avoid this issue by never undoing such joints.  However space limitations in my house mean that all planes now need to be de-rigged for storage. 

So.....

Any ideas as to how to make such joints serviceable?  Typically they are blind so adding a captive nut behind the joint is not an easy option. 

Something like these would seem ideal.  However I only know of a source down to M4.  Need something more like M2.



So any ideas?

THANKS!
24
Introduce Yourself Here / Re: Hi all
Last post by PDR - November 20, 2020, 10:57:54 am
I assumed you'd emigrated to Australia or something (so perhaps we should change your name to "Wirraway"...

:)

Welcome home.

PDR
25
Introduce Yourself Here / Re: Hi all
Last post by Brian Cooper - November 20, 2020, 09:28:48 am
Blimey, there's a name from the past.
They finally let you out, then....  :ev  ;)
26
Fullsize Aviation / Re: Duxford drops Flying Legen...
Last post by Tabsdad - November 19, 2020, 22:24:10 pm
Quote from: Dave_S on November 19, 2020, 22:21:03 pmThe only people I know who ride trikes are bikers no longer able to cope with two wheels due to accidents.....

I never thought of that and completely get it.
27
Fullsize Aviation / Re: Duxford drops Flying Legen...
Last post by Dave_S - November 19, 2020, 22:21:03 pm
The only people I know who ride trikes are bikers no longer able to cope with two wheels due to accidents. I knew one chap who was regularly pulled over on his trike because he was carrying a shotgun case - with his crutches inside!
28
Introduce Yourself Here / Re: Hi all
Last post by Chippie - November 19, 2020, 21:05:24 pm
Hi Harvard,
Its been a long while since you posted....,and a long time since fly-ins...
Good to hear you are still around..👍
29
Introduce Yourself Here / Hi all
Last post by Harvard - November 19, 2020, 20:20:12 pm
How have you all been since well ages ago have we still got some of the best flyers here, and some of the funniest people i had the pleasure of meeting up with,at a couple of flyins a long time ago.
Hopefully all those faces i met are still doing what they did best having fun and helping all the new guys.

30
Fullsize Aviation / Re: Duxford drops Flying Legen...
Last post by Tabsdad - November 19, 2020, 19:26:26 pm
Quote from: paulinfrance on November 19, 2020, 19:13:00 pmThe Trike has all the disadvantages of two and four wheels, :'' , " all in one" ^-^

That's what my summary says. " all the disadvantages of a bike and none of the advantages of a car"😁
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