Is there a tool or cutter that has several teeth that I can use in my
lathe to clean up some metric threads in an aluminum hood for a camera
lens/shutter? The threads are about 67mm internal. The hood has been
dented and after straightening out the hood as much as possible I will
need to clean up the threads.

Thanks
Bob AZ

"Bob AZ" wrote in message
oups.com...
Is there a tool or cutter that has several teeth that I can use in my
lathe to clean up some metric threads in an aluminum hood for a camera
lens/shutter? The threads are about 67mm internal. The hood has been
dented and after straightening out the hood as much as possible I will
need to clean up the threads.

Thanks
Bob AZ


What I do in these circumstances is cut and file a piece of thickish copper
sheet into a single tooth chaser, which I drag along the thread at the
slowest possible back-gears speed. Internal threads are trickier, but
possible.

Works a treat.

--
Jeff R.

Jeff R wrote:
"Bob AZ" wrote in message
oups.com...
Is there a tool or cutter that has several teeth that I can use in my
lathe to clean up some metric threads in an aluminum hood for a camera
lens/shutter? The threads are about 67mm internal. The hood has been
dented and after straightening out the hood as much as possible I will
need to clean up the threads.

Thanks
Bob AZ


What I do in these circumstances is cut and file a piece of thickish copper
sheet into a single tooth chaser, which I drag along the thread at the
slowest possible back-gears speed. Internal threads are trickier, but
possible.

Works a treat.

--
Jeff R.





I've used the same pitch tap, hand held at slow rpm to accomplish this.

--
Steve Walker
(remove wallet to reply)

They make a tool just for straightening lens threads and filters.
Porter's Camera used to catalog it, Shutterbug used to have a small ad
in the back for the manufacturer. At the price of some lens
accessories, one use would pay for it. It's kind of a flat jackscrew
with curved surfaces to bear on the dent(s). You could also cut a
male thread on your lathe and use that to gently restore the threads
back into usable condition.

Stan