I have 15 years experience as a bench jeweller/goldsmith. Recently I
bought a new Italian wedding band stretcher/compressor. The type with
the split mandrel extending vertically with the compresser directly
below with a removable steel disc containing concave depressions- the
most popular unit. I have used these machines for years so I am no
novice, I can’t reduce the size of a wedding band without distorting
it. The concave depressions keep throwing the work off centre so my
bands are getting skewed.
Any thoughts??? I thought that maybe grease on the bottom of the
plunger was possibly sticking to the top of the wedding bands and
causing it to be thown off, I also thought that maybe I need to high
polish the concave depressions. The plunger seems to be 90 degrees to
the disc bed, and my wedding bands start out parallel to the bed. I
am out of ideas.
Any advice/ help would be much appreciated!
Thanks in advance