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Posted by Snag on April 9, 2006, 7:14 am
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I'm making some shifter and brake pegs for a friend's bike , and have run
into a small problem . I suspect I have work hardened the SS when I drilled
it , because I've never had this much trouble cutting threads .
I have units made and drilled 3/16" diameter and about 1 1/2" deep , but
need some advice . The threads are to be 3/8-16 , and only need to be about
1 inch deep . The first one I drilled like 2 inches deep , in 2 steps (after
a 3/16" pilot hole). The piece was quite warm when I finished . Should I
take these out to the tap drill diameter in 1 step ? Should I use coolant ,
and if so what kind ?
The pegs are slotted 1/8" slots spaced 1/8" apart (done with a parting
tool) , and got very warm during this machining , could that have hardened
the SS some ?
--
Snag aka OSG #1
'76 FLH "Bag Lady"
BS132 SENS NEWT
"A hand shift is a manly shift ."
<shamelessly stolen>
none to one to reply
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Posted by T.Alan Kraus on April 9, 2006, 12:49 pm
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Take the work hardened skin off with carbide tooling at a very low speed
(for something around 3/8 diameter 200 RPM) . Drill your holes at slow
speed and make big chips ( aggressive feed) use plenty of
cooling/cutting oil, don't let the work heat up.
cheers
T.Alan
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Posted by on April 9, 2006, 2:27 pm
Please log in for more thread options Get a NEW tap to tap the holes. 300 series SS can be a pig to tap with
"pre-enjoyed" threading taps of dubious ancestry and questionable
history! :-)
Wolfgang
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