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Z axis torq problem.

Posted: Wed Apr 24, 2019 7:32 am
by rug.dr
hi, i have assembled the I3 Pro w over the weekend, and initially all tree axis had problem (both X/y strap werent tight enough, quick fix)

but i'm still struggling with the Z axis torq, i tried fiddle with the placement of the flexible coupler but i never get it to run smootly.

it just kind of try to move, but can only turn if i gently apply presur with a finder on each motor ... :\

i tried the following position on the coupler half and half to buttom. (this one was the worst ...)

then first part (where the screw) for each it seem's a lot easier for it to move but it's still not enough torq to make it move.

so what am i doing wrong with this one anyone have a picture of a working setup for this part ?.

I also tried putting lithium grease on the threaded rod and bearing it seem's to help a bit but still no free movement both way.

Re: Z axis torq problem.

Posted: Wed Apr 24, 2019 10:12 am
by William
Hi, I think you need this:viewtopic.php?f=82&t=60931

Re: Z axis torq problem.

Posted: Wed Apr 24, 2019 1:04 pm
by rug.dr
thanks for the quick response, i adjusted the coupling as show in the thread and tuned the power of the drivers and now it's printing supper accurately (after half an hour of tuning)

it has been a nice experiance!

thank you for the quick response

Re: Z axis torq problem.

Posted: Wed Apr 24, 2019 1:32 pm
by William

Re: Z axis torq problem.

Posted: Fri May 03, 2019 2:33 pm
by dga78
Hi, when I test the travel on the z axis, the motors hums (with gantry removed) but they hardly turn. Its as if they don't have enough voltage, however when I hit the limit with they turn the opposite direction fine.
Do I need to up the voltage to the motors (which circuit board is it)? or is there a config to change this?

Also occasionally they do turn but any force on them causes them to stop (I assume a safety feature to not jam the extruder on the hotbed).

Any help would be appreciated

Re: Z axis torq problem.

Posted: Sun May 05, 2019 9:35 am
by William
Hi, you can 1. remove the smooth rods and the thread rods on a table and check if they are bent´╝Ť
2. tighten the screws of the coupling.
3. The left Z-axis height should be the same as the right Z axis.
4. Maybe the A4988 of Z-axis has not enough power to drive the motor. And you should increase the voltage of A4988.
5. You should lose the Z brass nut a little.
I hope this can help you.