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Post by silverfox on Jan 29, 2008 9:27:18 GMT
I have miss drill some holes in the main frames!!!!
The new holes will 'overlap' the wrong ones, so they look like the mastercard logo (or a figure of 8 on its side)
I am thinking of tapping the holes and brazing/ sil solde the plugs and re drilling
Any other ideas better than that?
Ron (the other one)
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Post by Tim Bayliss on Jan 29, 2008 9:41:29 GMT
The 'standard' method of fixing this not uncommon occurance is to weld up the existing holes, grind/file back & start again. I'd guess that brazing in a plug (why tap the holes first?) would have a similar effect but be careful when re-drilling that the drill does not get snagged in the joint of the plug & parent metal.
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Post by ron on Jan 29, 2008 9:55:48 GMT
Hi Ron If you haven't got welding facilities, try tapping the hole, fitting a headless screw, rivett it in, then file it flush. If you are carefull you can usually drill the new hole successfully. [Err I'm reliably informed of this by a close aquaintance  ] Ron |
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Post by mackintosh on Jan 29, 2008 10:04:36 GMT
Hi Ron I would be wary of any form of heat because distortion could be an issue. It depends on how much the holes overlap. If it's not to much less than half a hole I would tap countersink lightly Loctite in a stud and rivet into the countersink and dress off. Hope this helps.
Bob
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Post by havoc on Jan 29, 2008 11:00:21 GMT
How functional are these holes? Otherwise a plug and some soft solder.
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Post by silverfox on Jan 29, 2008 11:21:51 GMT
Holes are to hold the cylinders!!. I am a bit wary of the heat aspect. Rather like the loctite and c/sink. Really daft thing is., i had already centre puched the locations on the other mainframe, but bolted them 'inside out' and had to work backwards to get the cylinder location. perhaps a small 'strap' on the inside of the frame would give it a bit more security ( eg cross section,...bolt head, strap, main frame, cylinder) as it would keep the 'filled holes' deciding to moveby keeping them between the face of the cylinder and the strap.
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Post by silverfox on Jan 29, 2008 11:22:14 GMT
Holes are to hold the cylinders!!. I am a bit wary of the heat aspect. Rather like the loctite and c/sink. Really daft thing is., i had already centre puched the locations on the other mainframe, but bolted them 'inside out' and had to work backwards to get the cylinder location. perhaps a small 'strap' on the inside of the frame would give it a bit more security ( eg cross section,...bolt head, strap, main frame, cylinder) as it would keep the 'filled holes' deciding to moveby keeping them between the face of the cylinder and the strap.
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Post by ilvaporista on Jan 29, 2008 13:08:12 GMT
Just one from me. If you tap the hole and put a bolt in (as would be my reccomendation) Watch out that the bolt is of a similar hardness to your frames. I did one with some cheap DIY bolts and the drill just followed the softer metal and left me almost back at square one... I know buy cheap rubbish and regret it...
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Post by chris vine on Jan 29, 2008 13:39:20 GMT
Hi Ron, the other one!
I have made this mistake too many times to want to think about.
I just loctite in a small plug. I turn it to length so that it fits flush.
You could tap the hole and put a threaded plug in with loctite. It will never move then.
I too would be wary of heat on the frames, quite apart from the problem of getting them hot enough to use silver solder.
Chris.
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Post by silverfox on Jan 29, 2008 13:41:05 GMT
They are 2BA holes, i have tapped them 7/32x 32 ( i think) it was nearly midnight when i found out the error . and will thread some m/s rod, loctite it it ans peen the ends over into the countersink. Should do it, the more i think about the retaining strap (There is nothing in its way) the more it makes sense.
Thanks to all for the advice
And apologies for the double posts etc, computers are not my strong subject!
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Post by Jo on Jan 29, 2008 14:58:53 GMT
Ron,
Idle thought: have you thought of knocking up a sort of eccentric washer? You could drill the hole over sized and then make a stepped washer. The bit in the frame could take up the offending offset, with the facing washer looking remarkably perfectly in line with the nuts on the studs.
Jo
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abby
Statesman
Posts: 925
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Post by abby on Jan 29, 2008 16:57:59 GMT
I did exactly the same thing , my solution was to TIG weld the holes and redrill , there was no distortion.
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Post by havoc on Jan 29, 2008 18:16:39 GMT
Did you already made the cilinder blocks? Otherwise shift those holes likewise. Even easier to tell the right from the left one afterwards...
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Post by silverfox on Jan 29, 2008 18:39:40 GMT
yes, cyls already drilled, thats how i discovered the mistake, off to shed for some serious work!!
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Post by silverfox on Jan 30, 2008 13:23:04 GMT
Thanks to all who replied, tapped the holes and loctited insert. also c/s both sides and flattened into c/s. all ok, holes now back where they should be
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