Avoneer
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 posted on 11/2/06 at 06:10 PM |
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Tapping ali bar for rose joints
Can I tap a solid 20mm ali bar so that an M12 rose joint can bolt on one end?
It's won't be in a very stressed application as will just be one end of the rotating bar that my top paddle shift rocker is attached
to.
Pat...
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Hellfire
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| posted on 11/2/06 at 06:36 PM |
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Yes.
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Jon Ison
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| posted on 11/2/06 at 06:48 PM |
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Cant see any reason why not in that application.
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flak monkey
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| posted on 11/2/06 at 06:50 PM |
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Yep, you need to drill a 10.2mm hole (assuming its M12x1.75 coarse, or 10.75mm if its M12x1.25 fine.
David
PS the quick way to get an approximate tapping drill size for any metric ISO thread is to subtract the pitch from the OD of the thread.
Sera
http://www.motosera.com
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Avoneer
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| posted on 11/2/06 at 08:51 PM |
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Will I get away with 10mm ?
Pat...
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diyer
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| posted on 11/2/06 at 09:06 PM |
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yes should do, as its aluminium
Simon
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Mark Allanson
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| posted on 11/2/06 at 10:21 PM |
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quote:
Originally posted by Avoneer
Will I get away with 10mm ?
Pat...
If you want it to cut 10.2mm, sharpen one of the lands to 5.1mm (leave the other alone)
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Avoneer
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| posted on 12/2/06 at 01:40 AM |
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Any ideas how I could drill a hole into the centre of it to tap without a lathe?
Pat...
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Jon Ison
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| posted on 12/2/06 at 09:30 AM |
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I assume you mean on edge ?
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Avoneer
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| posted on 12/2/06 at 10:08 AM |
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Down the centre of the tube.
Usually done with the ali bar in lathe chuck and drill bit in stock end.
Pat...
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However a large number of electrons were terribly inconvenienced.
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Peteff
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| posted on 12/2/06 at 10:46 AM |
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I tapped one to take a 12mm bolt for a spindle on the grandson's pushchair and it's lasted 2 years so far. It was only an insert and I
drilled it in the pillar drill. M12 sounds chunky for a gearshift application.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Syd Bridge
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| posted on 12/2/06 at 03:49 PM |
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A twisted flute tap helps a lot. And if you haven't got a 10.2 mm drill, go a little bigger, as ali tends to 'flow' or
'shape' as the tap goes in.
Use lots of wd40 to lube as well. 
Syd.
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Avoneer
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| posted on 12/2/06 at 05:22 PM |
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Cheers guys.
Managed to do it.
Found a piece of 24mm ali tube with a 10mm hole already through it.
Tapped it with cutting compound (smelly green sh*t) and it all worked out lovely in the end.
Cheers,
Pat...
 
Rescued attachment DSCF0022.JPG
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NS Dev
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| posted on 12/2/06 at 09:03 PM |
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Bobs your uncle, nice job. Some nice welds on that chassis too (shame about the rust! ) did you do it?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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johnjulie
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| posted on 12/2/06 at 10:15 PM |
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Have you got access to a good bench drill?
Hold the bar in a drill vice, and use a square to get it vertical. Use a small 1/8" or similar metric drill to start with, less chance of
wandering off centre. Then build up to the size you need. Carefully!!
Ideally you need a lathe, no one you know got one? Check for a model engineering club near you.
Cheers John
JFDI
"Just F*****G Do It"
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johnjulie
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| posted on 12/2/06 at 10:17 PM |
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Sorry It was a bit late, hadn't got to page 2. Wot a plonker!!!!
Cheers John
JFDI
"Just F*****G Do It"
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Avoneer
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| posted on 12/2/06 at 10:26 PM |
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No probs.
Found a bar (part of the engine mounts) but this can be replaed later.
Chassis was welded up by my friend in exchange for an LSD - I can only tack!
Rust should be gone by next week and the whole lot nice and shiny black.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Avoneer
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| posted on 12/2/06 at 11:03 PM |
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No probs.
Found a bar (part of the engine mounts) but this can be replaed later.
Chassis was welded up by my friend in exchange for an LSD - I can only tack!
Rust should be gone by next week and the whole lot nice and shiny black.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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