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Topics - daydreamandy

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1
Mach3 under Vista / Parallel port and Mach3 working but skipping steps
« on: August 10, 2012, 05:01:08 AM »
Hi
I can control my CNC Mill using Mach3 but have skipping steps and speed changes on all axis motors at random times and places.

I have:
Windows7 32bit
parallel port on motherboard, set to EPP
parallel optical breakout board
3x 2M542-N Stepper Drivers
3x Nema 23 Motors

I have already proved there is no wiring problems or noise(see below), and the problem happens even when the motors are disconnected from the CNC machine so it cant be missalignment of the machine or rough spots etc.

I made a little circuit using NE555 timer to control the motors via the 2M542-N motor drivers, bypassing the PC. There was no skipping steps or speed issues at all.
Therefore I can only assume the problem is somewhere at the PC end.

Help please!!! I am so close to getting my machine working and just cant fix this issue!!!

Andy

2
General Mach Discussion / Automate finding centre of X and Y
« on: June 25, 2012, 05:01:05 AM »
Hi

Just plugged in my metric CNC machine, looking to solve a problem of Zeroing the XY of the bed.

1. When you run "All ref home" is there a way to increase the distance the motors back off when they hit the limit switches, my switches seem to have a large distance between I/0?
(this sometimes causes limits to set, looking at diagnostics, the limit switch can set sporadically as it not showing as set any longer!)

2. More importantly, is it possible to make a script that will run a routine similar to "All ref home" but uses both limits on the X and Y axis?
I want the machine to find XYZ machine 0, then reverse the function to find XY max without zeroing the coordinates.
Then i want the machine to go to 1/2Xmax and 1/2Ymax and zero the coordinates there.

My machine is home made and my bed size is not the easiest size to deal with! Between limit switches is around 525.774X * 374.540Y (mm)
I found this out by driving XY motors to the limit switches.

Andy

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