When I press “Home”, the Z axis moves up to the vertical limit but X and Y don’t move at all.
Hi Austingraphics,
Welcome to the playground. I have no limit switches so can only rediret you to the " Homing and Machine Limits" in the troubleshoot page. This page is inside the Altmill section and that might not even be your machine.
It might be helpfull, if you give the folks that can help a bit more info on your setup. What machine you have, what controller, what sender, what etc. This way, they can get right into helping you instead of having to assume or ask about it.
Hope you get it going quick.
You don’t mention what machine or controller you have but I have a LongMill MK1 with a the 8-bit long board.
I have sensors and the homing sequence goes like this.
- move Z up till the sensor is triggered
- then move down by the pull-off distance
- move Z up slower till the sensor is triggered
- only after that is done does the X or Y start
- then it does the same procedure as the Z but does both the X and Y at the same time
So with that said does your machine stop after the first or second Z home? If it’s stopping after the first it could be that the either the Homing debounce time or Homing pull-off distance need to be increased.
$26 - Homing debounce, milliseconds
Whenever a switch triggers, some of them can have electrical/mechanical noise that actually ‘bounce’ the signal high and low for a few milliseconds before settling in. To solve this, you need to debounce the signal, either by hardware with some kind of signal conditioner or by software with a short delay to let the signal finish bouncing. Grbl performs a short delay, only homing when locating machine zero. Set this delay value to whatever your switch needs to get repeatable homing. In most cases, 5-25 milliseconds is fine.
$27 - Homing pull-off, mm
To play nice with the hard limits feature, where homing can share the same limit switches, the homing cycle will move off all of the limit switches by this pull-off travel after it completes. In other words, it helps to prevent accidental triggering of the hard limit after a homing cycle.
Above quotes are from endmill.com
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I have the altmill and the issue was the Z sensor. Thanks.
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You didn’t get into specifics but I’m assuming after your z axis tried to home, it tripped an error? And the fix was to adjust your inductive sensor until the z axis could home properly?
This has been a common issue lately posted on the Facebook page,
You said you had this on the Altmill? I recently purchased an Altmill MK2. It’s been homing OK since I received it. Now all of a sudden it only homes Z and then stops. The display still shows “Homing” button and nothing else is active. It might be the Z sensor but I’m really not sure I set it correctly since it seems the nut on the front face barely has any thread engagement. I had to remove the serrated washer on the one side to make sure the nut engages.
What did you do to correct the Z sensor?
Thanks
Ron
The instructions do state that the washer should not be used to ensure enough thread engagement. A better solution would be for Sienci to thread the plate so that the nut is not required, except the one at the back to lock it in place.
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Based on what I remember from my Altmill assembly, the z sensor sticks out about a mm past the nut. You likely don’t have the sensor in far enough. Just be sure the Z carriage doesn’t hit it.
I have no idea if this is why only Z homes. If the sensor is outside it’s range then in theory the Z carriage will keep going up until it hits a stop and will then throw a machine error. If t doesn’t throw an error it is likely not the sensor.
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There are no errors showing up, it just pauses the homing cycle.
As the other person mentioned, the directions actually say do not install the serrated nut, my nut just catches the last threads.
SOLVED: I figured out my problem. I tried out the XY squaring tool before this happened. Not sure exactly the steps I took but at the end it prompted me that I could improve my accuracy by updating the firmware. I’m not sure how I responded but think I just closed the window. When I went back into the tool to see what I might have done, there is a more graceful way to exit. Bottom line when I went into the firmware the values for $100 and $101 (X and Y resolution) were reset from 320 to 0. I updated to 320 again and all was good again.
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