Y home

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Y home

Postby jmackniak » 2016-Oct-Fri-08-Oct

Using Simple that i put together from a kit. Lots of y and z issues but i am getting through them. I had a Y issue, when i would home my Y the machine, pullies and belt, would jam up and make a god awful 'car talk' sound. I was advised to reverse the connector on my y 180 degrees. I needed to force the pins down but it did work.
My question: As i calibrate my machine for first time, i watch a video on youtube-https://youtu.be/JPGpEPR6Xxc Y home is at the back of his machine, when i home my Y it is at the front of the machine. does this matter??
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Re: Y home

Postby RetireeJay » 2016-Oct-Fri-08-Oct

jmackniak wrote: I was advised to reverse the connector on my y 180 degrees. I needed to force the pins down but it did work.

Reversing the Y connector will reverse the direction of the motor. That is, when the Printrboard tells the motor to move the Y axis "more positive" then reversing the connector will change the direction on the machine that it moves when going to a "more positive" location.

I don't know why you needed to force anything. The plastic connector for the motor sometimes has a little kind of a latch that you need to pull back in order to remove the cable from the board, but once you've got it started it should come off smoothly and go back on the board in the reversed direction just as smoothly.

jmackniak wrote:As i calibrate my machine for first time, i watch a video on youtube-https://youtu.be/JPGpEPR6Xxc Y home is at the back of his machine, when i home my Y it is at the front of the machine. does this matter??


Yes, it absolutely matters. Is your Simple kit a rather old one (more than a year and a half or so)? Old Printrbots all called Y=0 "home" on the Y axis. But newer ones often call Y=Max to be "home." This can get complicated (why, oh why did they ever do that?).

(1) Your firmware is set up to expect "home" to be at either zero or max, and most versions of the firmware don't make it easy to know which setting you have (but some versions do tell you, and even allow you to change it; check your EEPROM settings with M503).

And (2) the location of the home switch needs to be in agreement with the firmware setting.

And (3) the motor has to drive the Y axis in the correct direction to find the switch when going to "home," so simply reversing the way the motor is plugged into the board doesn't necessarily bring you into alignment with (1) and (2). But it might be necessary, depending on (1) and (2).

And on top of that, (4) your User Interface (Cura, Repetier, or ...) also needs to know whether home is at zero or Max.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
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Injection molded extruder gears
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Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
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