I purchased a small 5/16 geometric die head recently because I had to
make a fairly large quantity of screws for a clock project I'm
finishing. It really worked well and I'm very pleased with the results.
I have a question about the chasers that fit into the head. I purchased
a few sets on ebay and noticed that they have different letter markings
preceding the placement number on the chaser. These prefixes have the
letters A1, J1, L1, W1, Y1 and U1. They precede the numbers 1,2,3,4 on
the chaser sets. I'm also not sure how the chamfer and face grind affect
their use. Can anyone help me with this?
Thanks,
Bill S



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I've never heard of the A1...U1 designations for chasers, which means
nothing at all as I'm just a hobbyist. I do have a couple of old Gemtric
catalogs with some info on the chamfers and face grinds and I could send you
the relevant portions of that. Email me if you'd like that. Mostly I just
use whatever chaser match the thread form needed, though the choice should
depend on material.

You might also try emailing Quality Chaser and see if they can decipher the
prefixes for you.

Mike

"Bill S" wrote in message ...
I purchased a small 5/16 geometric die head recently because I had to
make a fairly large quantity of screws for a clock project I'm
finishing. It really worked well and I'm very pleased with the results.
I have a question about the chasers that fit into the head. I purchased
a few sets on ebay and noticed that they have different letter markings
preceding the placement number on the chaser. These prefixes have the
letters A1, J1, L1, W1, Y1 and U1. They precede the numbers 1,2,3,4 on
the chaser sets. I'm also not sure how the chamfer and face grind affect
their use. Can anyone help me with this?
Thanks,
Bill S



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