chrisg
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| posted on 22/4/09 at 02:39 PM |
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Tapping M10 hole
I need to fix my engine in place, it has M10 x 1.25 fine threads into an aluminium crankcase, but I don't have the correct bolts.
Would it be ok to tap these out to standard pitch M10?
Cheers
Chris 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Humbug
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| posted on 22/4/09 at 02:46 PM |
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I would have thought it would strip or cross the threads, making it less effective.
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tegwin
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| posted on 22/4/09 at 02:56 PM |
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NO... dont do that! Course threads in aluminium dont work at the best of times hence why most are fine....
Trying to switch between fine and course would just FUBAR the hole!
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Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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chrisg
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| posted on 22/4/09 at 03:00 PM |
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Message received and understood!
Thanks chaps 
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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mad-butcher
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| posted on 22/4/09 at 03:06 PM |
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try these chris http://stores.shop.ebay.co.uk/WVS-FASTENERS_METRIC-FINE_W0QQ_fsubZ13QQ_sidZ124709800QQ_trksidZp4634Q2ec0Q2em322
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chrisg
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| posted on 22/4/09 at 03:18 PM |
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Cheers Tony
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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02GF74
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| posted on 22/4/09 at 03:26 PM |
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quote:
Originally posted by tegwin
NO... dont do that! Course threads in aluminium dont work at the best of times hence why most are fine....
you sure about that? I thought aluminium and cast iron both use course threads?
e.g. on ford crossflow, head and alloy inlet manifold use UNC.
.... but then I don't know for sure, it is google time I guess....
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AdamR
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| posted on 22/4/09 at 04:10 PM |
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Agreed. Everything on a Rover V8 (aluminium block) is UNC.
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mad-butcher
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| posted on 22/4/09 at 04:25 PM |
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japanese
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minitici
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| posted on 22/4/09 at 04:38 PM |
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You could always fit helicoil or re-coil wire inserts and convert to 'standard' metric pitch.
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Jimbob
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| posted on 22/4/09 at 05:03 PM |
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Just buy the correct bolts!
They wont be expensive and its the right way to do it
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chrisg
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| posted on 22/4/09 at 05:29 PM |
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quote:
Originally posted by Jimbob
Just buy the correct bolts!
They wont be expensive and its the right way to do it
BUY!!!!
I nearly choked on me whippet!
Are you a REAL Yorkshireman or a foreigner?
(Actually that's what I've done, via Tony's link It was just an idea to save some time)
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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David Jenkins
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| posted on 22/4/09 at 05:45 PM |
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Soft metal should have coarse threads - stuff like aluminium is too weak to support fine threads in the way steel can.
It depends on your definition of 'fine' of course!
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chrisg
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| posted on 22/4/09 at 06:58 PM |
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quote:
Originally posted by David Jenkins
Soft metal should have coarse threads - stuff like aluminium is too weak to support fine threads in the way steel can.
It depends on your definition of 'fine' of course!
That being the case, I wonder why Honda went for fine threads?
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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richmars
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| posted on 22/4/09 at 07:05 PM |
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It's no the finest M10, you can also get M10x1.0
So maybe x1.25 is a good comprimise.
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David Jenkins
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| posted on 22/4/09 at 07:17 PM |
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I have taps and dies in my toolbox for 1/2" x 40tpi - that's fine!
(It's a model engineering thread, easy to set up for thread-cutting in an imperial lathe)
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