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PostPosted: Tue Jan 15, 2013 11:43 am 
retrobike rider
retrobike rider
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Joined: Tue Jan 29, 2008 11:04 pm
Posts: 1802
Location: A wretched hive of scum and villainy...
OK no problem,

You can always have the Helicoil option as a backup if it goes wrong
...Helicoiling would use a 5.2mm hole for M5 thread and a 6.3mm hole for 6mm thread.

All the best,


Last edited by danson67 on Tue Jan 15, 2013 1:45 pm, edited 1 time in total.

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PostPosted: Tue Jan 15, 2013 12:06 pm 
Dirt Disciple
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Joined: Sat Dec 22, 2012 7:49 pm
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Absolutely, a comforting insurance policy as i approach this with some trepidation! I saw a vid on the helicoil too.. what a great idea that stuff is. Presume i match drill holes with taps .. m5/5mm bit etc?


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PostPosted: Tue Jan 15, 2013 1:12 pm 
Retro Guru
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Location: Platsa, Messinias, Greece
Thaumaturge wrote:
Absolutely, a comforting insurance policy as i approach this with some trepidation! I saw a vid on the helicoil too.. what a great idea that stuff is. Presume i match drill holes with taps .. m5/5mm bit etc?


No, the tapping drill size for M5 is 4.2mm. That's the size that you need to drill, in other words.


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PostPosted: Tue Jan 15, 2013 1:52 pm 
retrobike rider
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Joined: Mon Jul 18, 2011 6:12 pm
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Bolt size minus thread pitch gives you the hole size to drill.(M5 X.8 is therefor e 5-.8 = 4.2 as Andy R stated. M6 x1 is 6-1 = 5 and so on .)
Matthew


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PostPosted: Tue Jan 15, 2013 2:45 pm 
Dirt Disciple
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Joined: Sat Dec 22, 2012 7:49 pm
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Ooh i seee.. i took pitch to mean the properties of the thread helix.. i.e. its spacing/speed. That makes for some odd drill sizes though doesn't it.. so there are special bits just for predrilling?


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PostPosted: Tue Jan 15, 2013 5:50 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
Yes!


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PostPosted: Thu Jan 17, 2013 7:51 pm 
Dirt Disciple
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Joined: Sat Dec 22, 2012 7:49 pm
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In the interests of closure, one of the taps i had was a nice round pitch number of 1mm so was able to drill it and tap successfully :)


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PostPosted: Thu Jan 17, 2013 8:24 pm 
retrobike rider
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Location: A wretched hive of scum and villainy...
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was able to drill it and tap successfully

:D Surely some sort of Right of Passage in bloke-shed world?

All the best,


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