Earlier this weekend the Primo was a champ cutting the strut plates for the LR v4. Two days later (today) I went to cut some 90* corners for clamping the LR table torsion grid during glue-up. Ouch. How the heck did it get so far out of square? I don’t remember it jumping or hitting anything… except I do remember all of a sudden on power up the knob on the lcd screen supplied with the SKR pro was jumping around (probably from excess dust like a scratch volume knob). Anyway all of a sudden the machine decided to home the Z and of course with no touch plate it drove the still bit into the spoil board…
I just remembered that while typing this. (Lightbulb).
You can see from the image of the 3” square and circle how bad it is….
My Primo squares each time by using end stops. Other people square theirs with hard stops, pulling the trucks to stop points which are known square, and keeping it there until power is applied to the motors.
With power off, the trucks can drift, or the trucks on one side or the other can skip steps, causing the machine to drift out of square.
This should be simple to remedy. If you have end stops switches and a 5 motor control board, you shojmd be abme to home X and Y again, and it should be good. If not, simply adjust the stop blocks. If you are running non endstop firmware, just pull the gantries into square with the power off, and hold them there when you turn it on and engage the motors.
Exactly what i have done forever. First thing i do is home X and Y utilizing the dual end stops after powering machine on usign the SKR pro board screen knob control thing , then I connect with Repertier and home again X and Y just for good measure. That is why i was so surprised when it was so bad.
I had a Primo end stop crack and slip. I ended up reprinting and then marking the position, i didn’t tighten it quite so much, and double checked against me position mark after squaring to ake sure the “bump” hadn’t move it.
Got the pen tool out (cheaper than breaking bits). While removing the makita, I noticed the Z was a bit wobbly. Couldn’t find any cracked parts. Tightened up couple of nuts on the lower bearings… then noticed the lead screw was way loose. Tightened that up with the two screws (good thing i kept my dads sears right angle Phillip screwdriver_ and then attempted to home X and chachachachaclunk clunk.
Turned off power. Noticed that the end switch on X? Rail (one in back i guess) was like a 12” from where it should and the motor just kept trying to reach it but it was never gonna.
I measured the one on the right and tried moving the one that was off and noticed the 1” dom moved. Somehow, the X rail moved. I was able to eyeball it back within what looks like 1/16 so fired the bad primo back up and homed Y. Success.
Hoping to build upon that while not wanting to hear any commotion I attempted to home X. Click click . Then again - double click.
Feeling confident, I ran the same square and circle test but using the pen. BAM! Luck still lives in my shop.
3 out of 4 of my original end stops broke when I was trying to get my steppers working right. That jack hammering effect when a stepper is missing a wire is no joke.
, then I connect with Repertier and home again X and Y just for good measure. That is why i was so surprised when it was so bad.
