Re: Need help with Dyno design

--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> I agree, although it would mimic the acceleration and velocity of

moving a mass such as a machine table or gantry. Acceleration could
be adjusted in the software. If the test revealed that the load could
not be accelerated to speed, the continual torque at set velocity
would be irrelevant. So, actually it would be a device to measure the
acceleration of a specified load in a predetermined duration.

>
> Ron

Interesting, as you could set a slow ramping speed, say over 12
inches or more, and then see where the motor misses. ie: increasing
load.

run a fast speed to test acceleration.

In my review of plasma machines, it seems that many first timers use
surplus steppers that are of questionalble power, then want more, so
move to servo's that are 10x the power.

then curse the steppers and praise the servos.

If one were to follow Mariss's advise and calculate the power needed,
then one would know before hand the size steppers and the expected
performance.

I spoke to a list member that is retro-fitting a BOSS with servos.
on the surface, it seems that the old steppers did work as Bridgeport
were run for many years with them.

so, it would seem that just offering drivers to the steppers would
have been the fastest path to getting things running.

Dave