Hello Tato, Several years ago the flex shaft of choice for stone
setting was the Foredom ‘R’ machine. When I bought mine several years
ago it was a wonderful machine. It would run at a very low rpm and go
up to a maximum of 14,000 rpm. After several years, I had to replace
the foot control. The newer controls have a design flaw that makes
them unusable at low rpm. Then newer ‘R’ motors have a high end speed
of 20,000 rpm.
The old foot controls were a simple design. They had a trigger
assembly from a variable speed drill inside the housing. This trigger
was depressed by a lever. The trigger was of a simple design also. The
new design is more complicated. There is a circuit board and there
are two micro switches in the assembly. Each of the switches have a
long actuator arm with a roller on the end. Here is the problem with
the newer foot controls. It seems that the switch for the low speed
circuit bends once the foot control is fully depressed. Once it bends,
you will no longer have low speed available on your machine. I have
tried several of the newer foot controls on my old motor, they all
have had the same problem. A few years ago I mentioned this to Foredom
and they seemed unconcerned with the problem.
I have rambled on enough. To answer your question. You will need low
speed for precision stone setting. You should be able to see the
individual teeth on a bur when it is turning at low speed. You also
need high torque at low speed. You will want high speed grinding,
polishing and finishing.
The ‘CC’ machine has good speed control, but it does not have enough
low end torque.
The ‘S’ motor does have more torque than the ‘CC’, but not as much at
the low end as the ‘R’.
I have not tried the ‘L’ machine because I want more high end speed
available than the 5,000 maximum that it offers. It is too slow for
grinding, and polishing.
Last week I ordered one of the new ‘TX’ machines. I will post my
opinion of this machine after I test it out.
I use several hand pieces. I use the #18D the most, but I would not
be without the #30. Get the #30 if you only get one handpiece. The #30
will accept anything up to 5/32". Another plus is that it accepts the
Good luck choosing a machine. I hoped that my comments have helped in
Timothy A. Hansen
TAH Handcrafted Jewelry