cmcgrath5035

I agree with @kiwigrant’s approach, also use care connecting grounds between your logic sifter implementation. Use the input power GND terminal.

Most stepper driver I/Os are in fact Opto-Isolators, the inputs simply anode and cathode of an led. As mush as possible, isolate driver ground noise from tinyG when possible. Check out the Schematics.

Test, are yyou there?

Woa, sorry, I depend on notifications when issues show up and somehow it got turned off.

G2core Probing – Have you seen this wiki item https://github.com/synthetos/g2/wiki/Gcode-Probes#configuring-probe-input

It answers some of your questions and a lot more.

Are you probiing directly from CLI, or using a CAM interface such as Chilipeppr or cnc.js?

Here is a link to an old post by someone using a tinyG machine to extrude ceramic paste
https://synthetos.comtopics/3d-printing-with-tinyg-rotational-axis-a-trouble/#post-10855
What you are trying to do is essentially sames as a 3Dprinter that dedicates a motor to feed hard plastic into an extruder

I don’t see how spindle speed control could be precisely synchronized to the current velocity of the syringe tip which tinyG will vary according to jerk settings and xyz velocity commands

You might want to scan thru the Issues section on the wiki for similar questions https://github.com/synthetos/TinyG/issues

I have not used cnc.js in a while, but do believe A axis is supported but needs to be enabled.

I believe it is a true statement that Gcode does not have a freehold command equivalent.
Gcode does have an M6 bitchange command, not supported by tinyG

In the Chilipeppr environment this can be overcome using a chillipeppr_pause directive in a comment.
Read this
https://github.com/chilipeppr/widget-gcodelist/blob/master/README.md

That should hopefully work for you.

• This reply was modified 4 years, 7 months ago by cmcgrath5035.

Sorry for delay.

I have no knowledge of HSMXpress and limited cnc.js experience.

Here are some more or less generic comments based on reported errors I see

Is your design in inch or mm? Frequently arc errors are the result of lost computation precision, made worse by repeated mm to inch conversions. tinyG uses mm as the native mode, so regenerating your Gcode in mm may help.
Or, changing the post processor to not use arcs will usually eliminate the arc errors.

Are you making parameter tweaks then attempting to resume from the recoverable error? That is not likely to work. When such an error occurs, there is still a queue of pre-computed movements waiting to be executed based on the original parameter set. Resetting or power cycling tinyG will recompute the movements then using your modified parameters.

If you received a return address, I think safe to assume you will get a replacement back.

I have no direct experience with your situation, so most of this is a bit of conjecture on my part.
My read of the tinyG Tuning process (https://github.com/synthetos/TinyG/wiki/TinyG-Tuning)
implies setting the current pot somewhat higher than a setting that produces minimal skipped steps. The problem is that the optimal setting this way is highly dependent on the load on the spindle – optimal for pine will not be the same as for aluminum or foam board.
Setting the pot for ‘minimum noise’ is not likely optimal. I would expect perceived noise to always be minimum at max pot, but that does not necessarily translate to maximum energy transfer to the milling process.
As the motor core heats up, less magnetic energy is generated by power pulses.
Perceived ‘noise’ from the motors is a combination of the frequency with which pules of energy are sent and the duration of those pulses. The higher the pulse current setting, the shorter the pulse will be. But once a stepper has made it step movement, excess current during the hold position phase of the movement cycle will heat up the motor core.

Damage a motor with bad commands?
Maybe, but I find it difficult to say any stall could bend a motor shaft (that would be bad). Core heating could change ‘noise’. Repeatedly ramming a motor into a stop might tend to loosen a pulley? (belt machine)? check your Allen set screws.

To really damage a motor the heat dissipated in the winding would have to be high enough to melt a winding wire and perhaps fuse it to an adjacent one.

Not much help, probably