One of my first new videos I will be making is just on tube setting.
Let me first explain one thing IN PRINT, the finished height of the
"table of the stone" to the tube wall must be that the “table” and
wall must be the same height… This is after filing and cleaning.
Why? you will run into premature wearing of the gold and expecting
loss of the stone…I personally like to have some metal over the
table height, just to avoid this problem.
So where does this leave you? Kindly make a seat about 1/3 the depth
from the top—>to the base of your tube…or putting it another way,
drop it down enough that you have enough working depth/metal. This is
to allow for much of your aggressive preparation.
Do not make any beads inside any wall…this is the failing shortcut
many of the setters use…this is not the correct way to set any form
of tube setting…:>( So what happens if you don’t have a decent sharp
graver at your ready? Not set the stone?..duh?
Has anyone mentioned using a “hart” shaped bur or commonly called a
"156C" bur…the bur must not be the same size as the girdle
diameter. The size of bur should not exceed 75% the size of the
stone…period!!! Make bur cuts all around the inner tube/wall all
at the same tube-depth and into the wall, also at the same inner cut.
Do not exceed any cutting that will weaken the tube wall. If you make
a deep cut, you will do two things…totaly weaken the wall structure
and have great problems in getting the stone tight…this is like
overkilling the cutting process…again, don’t use beads.
Trim some of the outside wall to to prepare the pushing over of the
metal…I use a # 4 Triangular cut 20 cm. file and make incremental
filing all around the tube…then you can use a brass pushing
tools…not steel…as this might leave marks on the metal and you will
have much grief getting those marks off of the outer wall and then
weaken the nicely prepared tube wall.
I would prefer to just use a fine finishing process using a flat
edge/surface, pumice wheel of only 180 grit strength to do your
cleaning…remembering you are involved in a very thin wall. Make
sure all of the wall IS OVER THE STONE, check with your 10x loupe
all through the setting procedure.
If you folks can wait till I make one of many videos you will have
all of the answers necessary. If you would like to assist me, kindly
write to me and tell me what topics you would like to view in great
detail…" viewing is lots better, than reading"… Gerry!