Just as a final comment, things are working very well at this point. A little bit of tweeking as suggested above helped.
But the biggest improvement was sparingly lubricating the lead screws. I had a can of spray silicon lubricant intended for the bearings and chain on my garage door. The can says the lube forms a dry lubricant layer that "doesn't attract dirt". I sprayed a bit of the lubricant into a plastic cup and used a Q-tip soaked in the liquid to apply the lube sparingly to the screws. That made a huge difference. After application turning the screws by hand was noticeably easier. And the chatter the anti-backlash nuts were making completely disappeared. All the axis run smooth as can be now.
here are the acrylics list. It was compiled by ralph of ben cut laser but I have done several and found the list to be true.
The 4 digit numbers are the ePlastics Reference Numbers
ORANGE 2422 - Can cut in 4 passes.
Light Purple 1020 - Cannot cut.
Dark Purple 3730 - Cannot cut.
RED 2423 - Can cut in 3 passes.
DARK GREEN 2092 - Can cut in 3 passes.
Light Green 2111 - Cannot cut.
Glass Green 3030 - Cannot cut.
Dark Blue 2424 - Cannot cut.
Light Blue 2069 - Cannot cut.
Yellow 2208 - Can cut in 3 passes.
Now there may be ways around the ones that are listed as cannot cut. Paint on the surface or nail polish could change that. I'll have to try it.
@Zax I have the GRBL 0.9 at the moment and was going to try the 1.1e or what the latest version is.
If I am honest, I got 2 3D printer and if I would try to stop the steppers by hand, I could not stop them, but those ELEKS MILL steppers are easy to stop...
I wil check the Vref as soon as I get my meter back....
The MANA.HEX was on and I updated that one first, before I tried GRBL
@nottingham82 excellent advices. Works like a charm now. Thanks a lot bro. There are still some minor inaccuracies but that should not be a big deal. I'll fine tune it later.
For those who have similar issue once you key in a wrong command then end up losing all the axis, what I did is to reflash the firmware and reset the numbers (ie 400.000; 500.000 etc) then reconnect the machine, you will have them back.
Hmm... Further testing has resulted in an inconsistent measurement... When using the jog command, I get the result as reported above... But when I enter a command into the command line, say, for example, Z22, instead of the expected 22mm, I get double the result, in this case 44mm... Further investigation to come... Still, I believe this process can be accurate, learning as I go...
Disabled Categories are greyed out
This topic will be moved to the category
Looks like your connection to Offical Forum was lost, please wait while we try to reconnect.