X-carve linux cnc upgrade tuning

Greetings all, i'm new to the forums but not totally new to the hobby CnC world. I have had my X-Carve for a little over a year now and with the advise of my friends have moved from an Arduino motion controller configuration to LinuxCNC. I have afew things left to get fully functional but i am currently trying to tune the machine. all the steppers are jogging (more or less**) e-stop works, touch off probe is wired properly but haven't tested it in EMC.

here's where i'm running into issues.

when jogging at low speeds (ie. 10ipm) my machine sounds like a jack hammer, more on Y as there are 2 stepper motors. when i was using the Arduino setup this was not the case. i understand i'm using more amps now and this is an entirely different beast by comparison. but i dont think this sound or behavior is correct. i could be wrong but its making the machine jerk and shake which will equate to pore cut quality long term.


i will have to get my machine config and upload it when i get home in afew hours.


Machine configuration physical:
X-carve
acme screw Z
GT2 pulleys belts X-Y
Stepper Driver kit with BOB


Documentation
Stepper driver kit docs




i am also getting some help from friends online elsewhere i will use this as a repository for information and update as regularly as i can in hopes any help or success i have will aid others.

mrbishop wrote: when jogging at low speeds (ie. 10ipm) my machine sounds like a jack hammer,

Are you jogging with a jogwheel?

A jogwheel sends (in effect) square-wave position commands. These can be a bit harsh on a machine with high accelerations.
You could try reducing the accelleration, or you could pass the jogwheel counts through the ilowpass HAL component (which is intended for this)

not using a wheel. just the keyboard and G1 commands.

mrbishop wrote: not using a wheel. just the keyboard and G1 commands.

That uses up my easy explanation.

What accelleration settings are you using? Is this a parallel port machine or are you using a step generator?

As a simple experiment, make the step-times 5 x longer. Then if that doesn't work make the accelleration 10s lower. You probably don't want to leave either setting that way, but it might help eliminate two possible sources of the problem.

its a parallel port card. all DB25. i posted a link to the exact kit i have in the OP.
I will be posting my config in afew hours when i'm home at my machine. and i will try your suggestion as well

config attached