I have an XL with the proximity switches. It appears that the homing process has some amount of slop to it - after a Homing cycle, moving to a ‘known’ location (like rapid SW) doesn’t always come out the same. It’'s been off by up to 2mm, which doesn’t should like a lot but I wanted to have a repeatable position against a fence and this randomness is throwing things off.
Am I expecting to much from the homing cycle? I had though that Home + move to Rapid would be repeatable.
The X has much less variability than the Y.
Question - if the two Y belts are different lengths (in terms of number of teeth), what happens? Is there any way to tell if the two Y belts are not synchronized?
Hi @mhotchin,
You should get a much, much better repeatability than 2mm on re-homing.
There are a number of threads on this topic, it depends on a number of things, but basically you should be able to get a repeatability that is down to fractions of a mm, I know I do. There is probably something mechanical that can be adjusted.
Ensuring equal tension on Y belts (on a properly squared machine) is important indeed, check out this great thread from @LiamN for how to ensure that:
I now use the Gates app and pitch measurement method, works like a charm.
The other trick that comes back regularly to maximize homing repeatability, is this one:
This ensures that the motors lock in place (and the pulleys engage with the belts) in a very repeatable fashion.
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