Re: [CAD_CAM_EDM_DRO] How fast is too fast on a Bridgeport?

washcomp wrote:

>I'm tuning my NEMA 42 stepper motors with MACH2 and find that I can
>make the table on my Bridgeport move at blindingly scary speeds (in
>excess of 20 ips).
>

20 IPS? Really? Thats 1200 IPM, or 100 feet/minute! That means you
can pretty
much go from one end of the table to the other in one second! Are you
sure of these
measurements? I would think that would tip a Bridgeport over on its
side unless it was
bolted to the floor!

> I've slowed it down, but don't have a clue what
>is an approprite speed and accelleration setting for the X, Y and Z
>axis? I'm currently running 1000 steps per inch. The table also
>seems to continue to move (from momentum, inertia) after I release my
>manual jog button. Is this normal?
>
>

Assuming the software ramps down the velocity when you take your finger off
the jog button, that is normal. If not, then it is losing position
every time you jog.

I usually limit my jogs to 45 IPM for safety reasons, and occasionally
set programs
to do rapid feeds of 60 IPM after the program is known to work
correctly. I just
don't see the need for such speeds unless you are doing heavy commercial
production.
It is very hard on the machine to run these speeds on sliding ways.

Jon