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Trex / Clone 450 SE V2 tail boom fitting for stays


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solentlife
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Joined: 30 Dec 2010
Posts: 927
Location: Latvia / UK

PostPosted: Mon Feb 21, 2011 2:22 pm
PostPost subject: Trex / Clone 450 SE V2 tail boom fitting for stays
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The tail boom on the 450's has that U shaped fitting that has the horizontal fin fitted to and also the two carbon rods from lower frame connect to to stabilise the boom.

Well during practice flight I had one boom sheer the bolt into that fitting ... so I got a drill slightly smaller than the threaded hole and drilled out the broken bolt. But of course when I tried to fit new bolt - the threads are gone and bolt is now just that tad under in diameter.



Is the bit in question ........ I thought about putting a nut on back - but of course it's a snug fit to the boom and no way can a nut be used.

Anyone any suggestions how to fix ? To buy a new one is accepted - but takes weeks to get here ... I have my spare from my barebones back-up machine but seems a shame to strip that when I planned it to stay pristine ready for when I can fly well !!
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Trouble
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Joined: 12 Aug 2010
Posts: 910
Location: Galveston, Texas

PostPosted: Mon Feb 21, 2011 6:20 pm
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A size larger self-tapping screw?
Actually since you used a smaller drill to clean it out I would get the same size and a size larger self-tapping screw, see if the same size self tapping screw works first..if not, the next size self-tapping screw will work. IF for some reason you cannot find the right size then fill the hole with a hardening compound, like they use on car bodies and screw into that. Too bad you are so far away, I would just send you a few. Sad
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pjdog
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Joined: 12 Jan 2010
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Location: Hudson, Florida, USA

PostPosted: Mon Feb 21, 2011 9:44 pm
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Use your tap and die set to put in a larger bolt.

jack
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solentlife
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Joined: 30 Dec 2010
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Location: Latvia / UK

PostPosted: Mon Feb 21, 2011 10:43 pm
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One of the problems here is that screw sets are difficult to find in the sizes used ... if it's car sized etc. (i mean proper car !) - then no problem. But anything like M2 as the screw is - forget it !!

I do have some M3 ... but it's a lot bigger and I was worried about the size of hole to drill in the rod end ... doesn't leave much 'meat' ....

I'll search my boxes - see if I can find some self-tappers ...

I know what happened ... broken screw part is harder metal than the fitting ... drill skids of and removes softer metal ... end result as I have. Even a pillar drill would have trouble I think ... as drill at that size is not strong enough to resist the deflection.

Best remedy of course is to ditch the old part and replace with new. That will be done ... but it's delivery time as I said earlier.
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Crashagain
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Joined: 17 Jan 2008
Posts: 1380
Location: Redding, Northern Calif.

PostPosted: Mon Feb 21, 2011 10:58 pm
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You may be able to get a standard thread that is just a little bigger and use that. I have done that in the past with succes.
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Dumb Thumbs
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Joined: 01 Jan 2008
Posts: 892
Location: USA, N.J., Middlesex county

PostPosted: Tue Feb 22, 2011 7:58 am
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Afraid you may be stuck untill you can find a screw small enough to work. I feel your frustration. I had a bolt break off in a MicroHeli alum bottom plate (Big $$$) on my Rex500 and could never get the broken bolt out, even broke a drill bit off in there, so now no hope of drilling out and retapping the hole. Also went through two alum boom braces because of bolts breaking off inside.
Some parts are better when made from plastic I've come to learn.
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solentlife
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Joined: 30 Dec 2010
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Location: Latvia / UK

PostPosted: Mon Apr 18, 2011 9:03 pm
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New item of ebay at $2 .... already at home waiting my return from assignment in Ukraine.

Old one I will find way to fix and keep as spare.
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