I have been trying to make some seats in some round prong settings
and have been having a problem with the stone setting bur grabbing
the prongs and not moving. I was using my Fordom flexshaft and was
working very gently, and very slowly. However, the bur would grab,
and not move. The stone setting bur was the correct size for the
stone I was trying to set. I used Bur-life to facilitate the process,
but it did not help.
I then removed the bur from the flexshaft and put it in my pin vise
and very gently tried to rotate it, but it grabbed the prongs and
would not turn I then switched to the next smaller size bur and had
the same problem, and furthermore when I did get it to rotate, it was
cutting the seat lower than I really wanted, and really chewed up the
bur. It seems to me that the teeth of the bur are too coarse, and
that a bur with finer teeth would work better. When I checked the Rio
catalog, there is no mention of the size of the teeth of the burs,
Does this mean that they all come just one size?
I finally was able to get the seat made, but am not happy with the
way the bur chewed the prongs when I finally got it to rotate. After
using a tiny file, I was able to get them smooth, but wonder if there
are better burs than the ones I have. I purchased them some time ago,
and don’t know the name of the brand. I will appreciate any
suggestions you have as to the best stone setting burs to use, and
any other suggestions. I don’t mind paying premium prices for the
burs. I just want ones that will work without grabbing. Thank you.