Messages

1

General Mach Discussion / Re: Stepper motors seem a LITTLE slow

« on: October 12, 2011, 11:10:10 PM »

When I had the velocity set to 200in/min I couldn't go above 5% in the slow jog % box in the manual screen. Since I have lowered the velocity to 10in/min and the accel is set to 0.5 in/sec/sec now I can go to 100% but these numbers are academic as the overall velocity is no higher than before. I hope this makes sense cause i'm confused as hell...lol.

When I say everything works fine, this is what I mean. My lathe is only 14" across the bed so 10 in/minute is slow but workable. I would have thought that for a rough cut I could have got 20-30 in/min but i'm no expert in machining. I'm an electronics man, not a turner. It's just something I fancied learning.
I should also add that i'm working with delrin 150 so I should be able to go quite a bit faster than working with alloys.

Also, my steppers are only 1 amp rated, I suspect they are underrated.

Cheers
Phil

2

General Mach Discussion / Re: Stepper motors seem a LITTLE slow

« on: October 12, 2011, 11:08:39 AM »

XML attached.

The motors are not so hot that I cant touch them.

Cheers
Phil

3

General Mach Discussion / Re: Stepper motors seem a LITTLE slow

« on: October 11, 2011, 03:11:18 PM »

Hi there

So, I set the board to 1/8th microstep.

The Mach3 steps per unit works out at 32000!! to get the correct travel. However, no increase in speed despite playing with vel/acc graph.

Are the motors supposed to get hot when running?

Cheers
Phil

PS I lived in Aberdeen for 10 years. The granite city.

4

General Mach Discussion / Re: Stepper motors seem a LITTLE slow

« on: October 11, 2011, 12:40:08 PM »

Correction:

Driver card set to:
Current (amps) 75%
Decay mode FAST
Microstep setting 1/2

5

General Mach Discussion / Stepper motors seem a LITTLE slow

« on: October 11, 2011, 12:33:15 PM »

Hi all

This may be something or nothing.

I have just converted a 7x14 mini lathe to two axis CNC. Everything works fine but when I increase the jog above 5% the drives start to loose steps and grind to a halt.
If i'm set to 5% and below everything is fine.

My config is as follows:

3.06Ghz processor.
TB6560 driver card. DIP switches set to 75%, FAST, Half step.
57BYGH603 stepper motors. 1.0amp 1.8 step angle 14.5 kg.cm running at 24vdc.

Using this information I have set the Mach3 steps per unit to 4000 which gives me the correct travel as per the DRO.
I have the step/dir timing set to 1us.

I have the acceleration set at 0.6 seconds and the velocity at 200in/min.

The kernel speed is 60,000hz.

Any help would be appreciated. It might just be that my motors are not man enough to go any faster which is fine as I can work with it as it is.

Cheers
Phil

6

Mach4 General Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: October 11, 2011, 12:20:27 PM »

Hi All

My Name is Phil and I have just converted a 7x14 mini lathe to CNC running Mach3.
I live in Ladysmith BC Canada.
I am an electronics design engineer.

I will have some questions shortly about maximum RPM for my stepper motors.
I will start a thread in the general section.