On 2010-08-21, Larry Jaques wrote:
On Fri, 20 Aug 2010 17:08:52 -0500, Ignoramus11290
wrote:

With the original Bosch drives, my 145v motors, etc, the mill was
capable of 200 IPM rapids. Right now I have a 70v power supply with
30A8 drives and the top speed is 60-70 IPM.

My question is how much am I losing, in reality, but having faster top
speed. My feeling is not much, but I want to know.

This is not an entirely idle question, as I could install drives that
match motor voltage (30A20AC or 25A20AC or some such). They would use
120 VAC as power source.

So, would I see any improvement in anything valuable with higher top
speed or no?

I'm in beginners learning mode, too, but I see the factors as being

1) What are you cutting?
2) What tool are you using?
3) What precision do you need?
4) What finish are you looking for?
5) What quantity of product do you need, and in what time frame?
6) What is your machine capable of?

For a hobby machine, I'd think that 60-70ipm is a great top speed.
Some of the machines in the links folks have been posting are giving
20ipm cutting and 80ipm fast return rates.


I am also learning, but I think that you are basically right. Those
top speeds are for guys making production runs.

i