Last week I worked on manually drawing some fine round wire (22ga to
30ga range) in the studio with some frustration. The problem was wire
breakage. The larger gages are no problem but the finer ones break
off at the star of the pull. Do any of you have tips or hints that
may help? I just finished a search of the archives and Randy Smith
had a post that stated using pulling pliers with the teeth filed off
was an aide in reducing breakage on fine wire.
The draw plate was held in a vise mounted on a very hardy and sturdy
worktable in the forming area of the studio. The draw plate being
used is a high end one with tungsten carbide inserts. I was using
drawing tongs with teeth. The end of the wire was tapered. I did find
that making sure that a about 1/2 inch of wire protruding from the
pulling side and making sure that the wire was gripped as close to
the plate as possible was helpful. I tried work hardening the end of
the wire however that seemed to increase the amount of breakage. The
wire and the draw hole were lubricated. The wire with paste Bur-Life
and the hole with liquid Bur-Life. The wire was held level going in
the plate and pulled in one continuous level pull. There was no
problem once the wire was going well. The problem was breakage at
the start of the pull. Much care was taken to reduce the size of the
wire in very small increments.
Please offer your insight and suggestions on improvements in
technique that was result in less frustration and greater success.
Best wishes to all,