Messages

1

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 18, 2020, 03:12:41 PM »

Rich, I was clicking to slow down the feedrate to see what's happening, without clicking it's the same, just don't consider that.

The G04 P100 dwell is there because I put it there, because between every change of direction the motor stalls, don't ask me why, because in normal turning also in G0 rapid doesn't stalls. Maybe it's for the accelerations, but they are the same with a little stop before moving, and with that doesn't stall anymore...I think is for the too fast change in direction.

If I create a standard threading code with the wizard, like M8x1.0, I think I can't see the problem, if it's there, because in proportion the movement is a lot smaller...but I will try.

The macro is the original one, I tried with G76 and with G32 from that macro.

I will try your suggestions as soon as I have some time, now I'm really busy and can't try them.

Thank you for your time for now.

Christian

2

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 13, 2020, 08:32:33 AM »

Rich, I actually don't have any current reduction in the drives. The current settings are correct for my size motors.
SW4 is already ON.
I have now set the steps per revolution at 1000, why have to try at 2000?
I already have correct steps per unit settings, I use the lathe frequently with no issues.
I have the backlash enabled yes, and in the pdf Threading on the lathe it says that works fine...however, I already tested it without it and the result is the same. The X axis is ok for backlash on my lathe.
I can't set the speed manually, I only set it via Mach3.
Thank you,
Christian

3

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 13, 2020, 07:45:06 AM »

It's the same whatever size I use, in G76 or G32.
In this particular case I was trying to do a 28mm pitch round profile thread in a piece of plastic.

4

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 12, 2020, 09:28:38 AM »

The stepper drivers are 2M656.

Christian

5

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 12, 2020, 02:52:55 AM »

Thank you all for your reply.

I attach here the xml.

I'm using a modified screenset from Franco CNC on youtube:

https://youtu.be/0R2JI__YhF4

I ran the drivertest.exe program, and the result is very good, 25065 pulses, I attach a screenshot. Moving the mouse is ok, nothing strange happens.

The version I'm using is R3.043.062

I tried the threading wizard, in G76 and also in G32, and I tried also with a CAM postprocessor, the gcode is also in G32, but nothing changes, the problem is the same.

The stepper drivers aren't the TB6600, at this moment I don't remember exactly the model, but they are the standard black chinese drivers for Nema 34, I think DM856 or similar, I will confirm tomorrow.

Thank you for your time.

Christian

6

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 06, 2020, 04:57:40 AM »

Ok so, yesterday I tried several times, with no luck.
I have the spindle rotating at 100RPM, a pitch of 28mm, the first 15-20mm the Z axis starts at 30mm/rev, then goes to 32mm/rev for another 15-20mm and then goes to the correct 28mm/rev. I tried changing value of acceleration of the Z axis but in my opinion is not related, it does not change anything. The feed has to be 28mm/rev from the beginning, apart from the acceleration of the motor.
If anyone knows a possible solution to this (not only to start several millimeters away from the workpiece, I know it) I will appreciate it.
Thank you
Christian

7

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 04, 2020, 01:13:51 PM »

Update: after an entire day of trying to change every setting, with no luck, today, after some normal turning, I tried again and it worked perfectly.
Don't ask me how...I don't know!
Only thing I've done I think is reinstalling Mach3 latest version after trying an older version with no luck.
I'll see tomorrow if it's still working ok...

8

General Mach Discussion / Re: Mach3 turn threading problem with Z feedrate

« on: February 04, 2020, 05:21:15 AM »

I read it so many times

9

General Mach Discussion / Mach3 turn threading problem with Z feedrate

« on: February 04, 2020, 04:02:57 AM »

Hello everyone, I have a CNC converted lathe, everithing running fine with Mach3 turn from a few moths.
I need to thread now, and I have a problem, I can not understand why the Z axis movement starts with a different feedrate, and then stabilizes at the correct feedrate after a few millimeters. Everithing else is correct, if I change the RPM, the feedrate changes accordingly, but I can't figure out why at the start is different...
I attach a link to a little video of the problem. In this video I slow down the feedrate to make it easy to you to see what is the problem. You can hear the motor changing 2 times feedrate before going to the correct one.
It is the same with G76 or G32. I also tried to make some G1 passes in G95, and the feedrate is correct, but not in G32 or G76.
I think I have tried changing every settings in Mach3 with no luck. I hope there is something here that can help me.
Thank you very much.

https://drive.google.com/open?id=1_NKYLJ-pcKyUJI7g80QR5-i9lU1dOFSB