Messages

1

General Mach Discussion / Re: Steppers and mach out of sync

« on: April 18, 2011, 03:54:56 AM »

how would i go about that? just with a multimeter from the pin to ground?

2

General Mach Discussion / Re: Steppers and mach out of sync

« on: April 18, 2011, 03:24:54 AM »

I have mach 3 set up as per the instructions.

I have removed each lead screw from the coupling, and turned them all through their complete length multiple times. there are no spots where anything is binding.

The motors are getting a little warm,i can keep my hand on them, but i wouldn't say its comfortable if you know what i mean. they are a little hot.

3

General Mach Discussion / Re: Steppers and mach out of sync

« on: April 17, 2011, 11:35:34 PM »

Hey, sorry this has taken so long, ive been away for work.

I have completely programmed mach 3 from scratch to the point of completely un-installing and re-installing a newly downloaded copy. Still the same problem is there.

My Driver board is a HY-TB3DV-M (imported from china, cant find the make).

Im starting to think i may need to buy another driver board and give it a go.

4

General Mach Discussion / Re: Steppers and mach out of sync

« on: March 07, 2011, 07:42:15 PM »

I have checked the coupling,turned the leadscrew by hand moving the axis from one extreme to the other a couple of times and cant find any tight spots, all fixings are nice and tight, the axis is moving nice and square, bearings are fine.

I have swapped the motor with another of exactly the same type and i still have the same problem.

5

General Mach Discussion / Re: Steppers and mach out of sync

« on: March 06, 2011, 02:40:16 AM »

Ive done all of the above, im confident that the motor is not missing steps. and it has almost no backlash on the axis at all. the velocity and acceleration are both set to a nice low value and when i try to stall the motor, i have a nice amount of torque there.

6

General Mach Discussion / Steppers and mach out of sync

« on: March 05, 2011, 05:28:33 AM »

Hey,

I have just built my own CNC mill from scratch. but i have found a problem that i cant seem to solve.

to cut a long story short my x axis which is directly driven by a leadscrew will not consistently match up with the DRO readings in mach 3.

for a start, my motors are running at 200 steps/rev, driving a 1.5mm leadscrew, controller is set to 1/8 microstep. which works out to be 1066.6 steps per mm. but moving the axis 100mm on mach 3 will only physically move the gantry about 80mm. i have played around and found a number that will move it almost exactly 100mm (some fine tuning needed) but when i went back to it the next day to fine tune it, the steps per mm were still the same as what i had programmed it to the day before but it was moving 20mm more!

i cant think of any other way to describe this problem but ill answer any questions u have for more information.

please help. its getting very frustrating! lol