3 Axis CNC router

**AndyUK** · 18-05-2020

I'm with Neale, sounds like Z is trying to move too fast.

I've had to detune my Z quite substantially compared to the X and Y speeds, the rapid upwards Z motions at the start of my cuts caused it to stall. Wonder if its something about moving a heavy spindle directly against gravity - although you'd hope that was only a small factor. It runs approximately 40% of the rapids speeds of X and Y (after correcting for screw pitch differences) and about half the acceleration. Its a 1605 running on a 3.1nm Nema 23, velocity 2m/min, 200mm/s^2 accel. Probably conservative, but works for me. Not a problem in every day life though as the travel is so much smaller :)

Regards the special cable, it requires a slightly custom job. I used a RJ11 crimper and some CAT5 to knock up one - you only use three wires. If you want I'll lend you one.

**JoeHarris** · 18-05-2020

Originally Posted by AndyUK

I'm with Neale, sounds like Z is trying to move too fast.

I've had to detune my Z quite substantially compared to the X and Y speeds, the rapid upwards Z motions at the start of my cuts caused it to stall. Wonder if its something about moving a heavy spindle directly against gravity - although you'd hope that was only a small factor. It runs approximately 40% of the rapids speeds of X and Y (after correcting for screw pitch differences) and about half the acceleration. Its a 1605 running on a 3.1nm Nema 23, velocity 2m/min, 200mm/s^2 accel. Probably conservative, but works for me. Not a problem in every day life though as the travel is so much smaller :)

Regards the special cable, it requires a slightly custom job. I used a RJ11 crimper and some CAT5 to knock up one - you only use three wires. If you want I'll lend you one.

Thanks Andy, yes I will try slowing the Z down a bit and see if that helps. Kind of you to offer a lend and an excuse to head down south sounds nice! but what about one of these: https://www.aliexpress.com/item/32931330627.html probably costs less than the postage back and forth!

**Clive S** · 18-05-2020

Originally Posted by JoeHarris

Thanks Andy, yes I will try slowing the Z down a bit and see if that helps. Kind of you to offer a lend and an excuse to head down south sounds nice! but what about one of these: https://www.aliexpress.com/item/32931330627.html probably costs less than the postage back and forth!

Yes that should do it.

Not sure if it will work with win10

I made a cable a few years ago that I keep in the control box. I think mine connects to a serial com port.

**AndyUK** · 18-05-2020

Looks like the sort, but some concerning reviews.

Half-way house in the meantime from the manual:

Auto configuration by SW4
Change SW4 two times in one second to identify the motor parameter after
power-up if it is the first time installation. Please note that the rotation
switch position must be 0 when using this function.

**JAZZCNC** · 18-05-2020

Originally Posted by JoeHarris

Thanks Andy, yes I will try slowing the Z down a bit and see if that helps. Kind of you to offer a lend and an excuse to head down south sounds nice! but what about one of these: https://www.aliexpress.com/item/32931330627.html probably costs less than the postage back and forth!

Don't bother buying the cable Jo you won't need to play with PID settings etc. Just flick the Switch 2 times in quick succession, when you do it the motors will make a buzzing sound for a second then stop. If the motors are whistling at the moment they will probably stop or change the tone.

**JoeHarris** · 18-05-2020

Originally Posted by JAZZCNC

Don't bother buying the cable Jo you won't need to play with PID settings etc. Just flick the Switch 2 times in quick succession, when you do it the motors will make a buzzing sound for a second then stop. If the motors are whistling at the moment they will probably stop or change the tone.

Thanks guys, pretty sure I did this when I first set them up.

I got the laptop set up - connected it to the ipm but it wouldn’t connect for some reason, then it crashed! Maybe I should persist with plan A!!

**JAZZCNC** · 18-05-2020

Originally Posted by JoeHarris

Thanks guys, pretty sure I did this when I first set them up.

I got the laptop set up - connected it to the ipm but it wouldn’t connect for some reason, then it crashed! Maybe I should persist with plan A!!

To be honest I thought you had done it because I seemed to remember going thru it with you before. The Software just does the same thing but it does allow you to tweak it, but you should only need to do this is your having resonance issues, etc. Which you are NOT. 99% of the time the Auto tune option works fine.

RE: Laptop did you set the Adapter IPV4 address to manual .? and set to 10. 1. 1. 1 and 255.255.255.0

**JoeHarris** · 18-05-2020

Originally Posted by JAZZCNC

To be honest I thought you had done it because I seemed to remember going thru it with you before. The Software just does the same thing but it does allow you to tweak it, but you should only need to do this is your having resonance issues, etc. Which you are NOT. 99% of the time the Auto tune option works fine.

RE: Laptop did you set the Adapter IPV4 address to manual .? and set to 10. 1. 1. 1 and 255.255.255.0

You did! I’ll leave the protuning for now then.

Haha, no, totally forgot that important step! Cheers Dean. Its been a long while since I last went through the ip/m manual page by page. Looks like I need to get it out again...

Sent from my iPhone using Tapatalk

**JoeHarris** · 16-06-2020

Originally Posted by AndyUK

I'm with Neale, sounds like Z is trying to move too fast.

I've had to detune my Z quite substantially compared to the X and Y speeds, the rapid upwards Z motions at the start of my cuts caused it to stall. Wonder if its something about moving a heavy spindle directly against gravity - although you'd hope that was only a small factor. It runs approximately 40% of the rapids speeds of X and Y (after correcting for screw pitch differences) and about half the acceleration. Its a 1605 running on a 3.1nm Nema 23, velocity 2m/min, 200mm/s^2 accel. Probably conservative, but works for me. Not a problem in every day life though as the travel is so much smaller :)

Regards the special cable, it requires a slightly custom job. I used a RJ11 crimper and some CAT5 to knock up one - you only use three wires. If you want I'll lend you one.

I have completed a few successful projects now, pocketing, profiling and v-carving, all without much of a hitch. But trying some 3D (2.5D) carving has resulted in my z axis behaving badly again! Part way though a roughing toolpath the z axis started moving a little erratically and then stalled a few times (I think). It moved up and started milling above the work piece. I pressed feedhold then stopped the machine, the spindle stopped but the z axis kept making jolting movements in an upward direction?! It only stopped it's mad movements when I hit the emergency stop. I am going to throttle back the motor tuning some more on Z to see if it relates to that, but it seems very odd to me that it would carry on moving after being told to stop. Has anyone else had a similar issue?

**JAZZCNC** · 16-06-2020

Don't know why it's doing this never seen it before but the reason it kept going after feed hold was because it was emptying the buffer.

Have you done a check to see if your missing steps from the pulse being on the wrong side of the edge.? If not then Zero the Z-axis and mark it's position then write some G-code so it moves back n forth several 100 times, only needs to be short moves. Make the last move go back to Zero.
If it doesn't return to the mark then you need to change the active Hi/Low in motor tuning for that Axis.