Messages

1

General Mach Discussion / Re: Help Needed with MY 3040 cnc machine -Z axis Problems.

« on: January 28, 2016, 05:27:14 AM »

Thank you
I understand now ,I'll try increasing the velocity in the axes, especially the x and y , and thanks for explaining what the G01 and G02 are for , the feedrate and the plunge rate , G code is making more sense by the day

Regards Rob

2

General Mach Discussion / Re: Help Needed with MY 3040 cnc machine -Z axis Problems.

« on: January 28, 2016, 04:56:20 AM »

Thanks ,I will try that , I saw the slow jog setting  but didnt try it as i really want a fast jog, but if I set slow jog to say 10% does regular jog become 10 x faster? .
In motor tuning I have all 3 axes set at   400 150   (slow) If I set the velocity higher so the jog and rapids increase , the G code will still overight the velocity with the feedrates for cutting, Am I right?

Regasrds Rob

3

General Mach Discussion / Re: Help Needed with MY 3040 cnc machine -Z axis Problems.

« on: January 28, 2016, 04:25:11 AM »

Thanks for the reply , i appreciate it .Ive just found out what my problem was, I thought it might be a motor issue so I started to swap over 2 motors to see if the problem transfered axes, and found that the coupling on the z motor had come loose. I sorted that and recalibrated the Z axis and the cutting depoth
is now perfect.
I understand keeping the accelleration and velocity low increases acuracy , but how do you get the rapids to be faster than the set velocity? and is the rapids speed the same as the jog speed as again with my motors set at the manufacturers recommended 150 ,rapids and jog speeds are painfully slow .

Thank you again, I told you I was a NEWBY

4

General Mach Discussion / Help Needed with MY 3040 cnc machine -Z axis Problems.

« on: January 27, 2016, 01:06:36 PM »

Hi
I have a 3040 chinese cnc machine , and I make my g Code on Cambam and use a licenced Mach 3 software.
I started cutting 3 mm perspex and managed to get pieces cut with very few noticable problems.

When I started to cut Aluminium it became apparent that the Z axis needed calibrating so after watching a video on YOUtube I set up the Z axis , but I still have problems.

When I start a program on Mach 3 after zeroing the z axis , It soon becomes apparent that each pass is deeper than the G code is stating. the DRO on Mach shows what should be happening but in actual fact the cuts are too deep.
When the DRO shows a depth of -1.8 to 2mm , the actual depth is 3mm. The settings page on Mach 3 confirms that the Z axis is set up correctly. I have had occassions when I get to pass number 15  or so (Each pass is 0.1mm) the tool digs in and drills though the remainder of the 4mm aluminium, breaking the tool in the process.
In hindsight I have always had this problem but as perspex is more forgiving I must have got away with it.
I would appreciate some help as I have run out of ideas.  The G code looks fine , I can see the coordinates being sent out and there is nothing strange that I can see.
The only thing I can say is that when I jog the z axis there appears to be some minor glitches in the sound of the motor which I cant hear on the x and y motors .

thanks Rob