I have two questions that I hope are not too burdensome to answer.
Question #1 is, are channels ordered from suppliers? Can they be
fabricated (and would it be worth the effort) out of sizing stock?
All sizing stock I’ve seen is too shallow to accommodate many stones,
especially colored I recently acquired the Allset
channel/prong cutting set, and in the instructional video, a jeweler
is cutting seats on what appears to be either a cast or fabricated
length of channel that I presume could be added to a mounting. I’ve
been unsuccessful in finding this type of pre-fabricated channel. For
all I know, it could have been just a prop to demonstrate the tool. I
always thought channels were cut into thick shanks, drilled and seats
cut for the stones.
Question #2 is, how do you decide what tubing size to choose if you
wanted to cut a seat and tube set a say, 2.5mm stone? Tubing in
catalogues list OD/ID dimensions. Would tubing with a 3 mm OD and a
2.12 ID be appropriate? How much wall thickness needs to be left in
order to securely set the stone? Thanks for your help!