Messages

1

General Mach Discussion / Re: Motors unable to run slow/missing steps

« on: February 17, 2009, 07:13:59 AM »

Steps per unit is 1574.803.

I'm using mm and a 100mm move does indeed give a 100mm translation.

2

General Mach Discussion / Re: Motors unable to run slow/missing steps

« on: February 17, 2009, 06:41:09 AM »

Ah ok. I should explain that when I say the wizards are working fine, they only work fine at higher speeds. If I try to run a wizard with a slow feed the motors just dont move. I think that is the root of all my problems. I'll check my code out for what you have suggested also.

Thanks!

3

General Mach Discussion / Re: Motors unable to run slow/missing steps

« on: February 17, 2009, 04:55:14 AM »

I'm as sure as I can be its not backlash. When I use the wizards in Mach 3 it cuts perfect circles, rectangular pockets or hole patterns.

Its just when I try to run a programme for a part it starts missing steps. It also seems quite jerky when going round profiled corners too.

My big concern is that my motors won't run slowly, could this be a motor tuning issue??

4

General Mach Discussion / Re: Motors unable to run slow/missing steps

« on: February 17, 2009, 03:46:08 AM »

The motors should be fine, they are 280 Nema's so they should be way more than man enough for what I'm asking (0.3mm depth cuts in alu with a 3mm endmill).

Any suggestions as to what settings I can try to tweak to help this?

Thanks!

5

General Mach Discussion / Motors unable to run slow/missing steps

« on: February 17, 2009, 02:01:36 AM »

Hi everyone. I'm struggling a bit to get my motors running right. I'm running Mach 3, with a Gecko 540 and Kelling 48V power supply & motors on a Taig mill.

I managed to calibrate everything fine, so each axis moves what it says it should when I ask it too. I tried some of the wizards in Mach 3 and they all seemed to work ok.

My problems come when I tried to cut my first proper part. I generated the g code in meshcam and I was really conservative with the feed rates (didn't want to do any damage). It seems my motors just don't run at all if the feedrate is too low. By low I am talking about 4ipm (100mm/min). Surely I should be able to run the motors this slow?

The part I test cut looks a mess. It's all of about the right dimensions but the circular pockets are all out of round, and the external walls are a bit chewed up where I'm guessing the mill has lost/gained steps.

Any ideas why my motors stall at low speeds? Is this normal???

Thanks for any help guys!

Rich