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1

General Mach Discussion / Help with jerky motion - again!

« on: September 04, 2018, 08:00:34 AM »

Hi,
I would really appreciate some help with jerky motion on my milling machine.

I've read many many post and tried lots of different options and I still have the problem.

So, if I hold the arrow keys down, then motion is smooth.
If I use an external MPG then the motion is smooth.
If I push the RefAllHome button then the motion is smooth (this I find odd).

But if I type a simple command like G0X10 (for example), then the motion is significantly jerky.
This affects all three axes equally. If it runs smooth then all 3 axes are smooth. It is runs jerky then all 3 axes are jerky.

Also if I type:
G64
G0X10  (in mm)
then then the motion is jerky.

It follows that if I load a g-code program then the motion is jerky.

I've tried all the combinations of CV and FullStop modes with no difference. Not that I would expect any difference with a simple one command of G0X10.

I've tried all sorts of motor tuning options of fast acceleration fast speed. slow acceleration slow speed, etc. And still I get jerky motion with the G0X10 command.

My setup is a Bridgeport CNC Interact with upgraded servo motors using Mach3 version R3.043.
 

Thanks
Craig

2

PoKeys / Pokeys57CNC Problem with Matrix Keyboard

« on: March 17, 2018, 08:20:23 AM »

Hi All,

I have Mach3 running with a Pokeys57CNC board. It has 3 axis motor controlling 3 servo motors, PWM 10V analogue driving the spindle, and all the limit, home and E-Stop switches are all working fine. So far so good, the 57CNC has been a great board and rather straight forward to configure.

However, I recently added a small matrix keyboard 3x4 and this is giving me significant trouble to get up and running.

It works, but VERY badly. If I press a key, it registers after about 2-3 seconds. If I hold the button down, then it works maybe 3 times every 10 seconds and very unreliably. I've followed the setup description in the manual, there are no external components (so no external pull up resistors for example) just the buttons wired in a matrix for the keyboard. I also implemented the trivial 1x1 matrix and it shows the same behaviour.

To see the operation of a button, I used both Mach3 and directly with the Pokeys configuration tool. Both show the same behaviour, so I doubt it's directly a Mach3 related issue, apart from the configuration mentioned above.

Any help with this would be appreciated.

Craig