hello
my first post on this forum
i have a weird question, not sure if its possible but maybe there is a workaround
so here is the fun, i’m building a polar sand table (a dune weaver) the original one use gear and a “crash homing method”
im modding it to a belted version with optical end-stops until here all good everything homes
that’s the sequence:
First home x axis (the rotary one) to found the opto switches, once the x is aligned with the switch the y axis can home safely. all good
But as the x axis is homing the belt of the Y axis is winding around his stepper and depending on the position the y carriage will crash on one end or another
Is it possible to disable the y stepper during homing?
(im using grbl 1.1h on a cnc shiel v.3 with a nano)
Like:
$H
Disable Y stepper
Home X
Engage Y stepper
Home Y
That should stop winding the belt around the stepper
i dont mind to modify grbl but some info would be super great
ill try to upload a video and pictures of the project
If something is happening in the code to cause the Y axis to move during an X Home command, personally I would concentrate on finding out why (and fixing that), rather than trying to disable the stepper as a mitigation technique.
Usually the homing sequence touches the limit switch once, backs off, then touches again at a slower speed. Has the Y Homing actually completed, or is it doing the second home sequence?
Or is there possibly a wiring issue where the Y motor responds to X commands?
A video might help us to understand the problem better. In order to post a video, you will need to create a YouTube account, create and publish the video there (public, not private), and then post the link to the video on this forum.
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the problem i have is not from the code, i have activated grbl to run first x and then y the sequence is working as it should, the problem is mechanical,
its a rotary system, the Y stepper motor is also the center of the rotary axis (X)
so basically as the rotary axis home while the y stepper is locked the belt is winding around
not sure how to explain it
for ex if you put a rope around a tree and you pull from one side of the rope you will be puled (sorry for the weird explanation i don’t know how to put it )
if you look for tuanchris dune weaver you will see the system, min is similar but i replaced the gear with belts
many thanks again for your time
ill follow the steps to gain trust level, (and publish a video)
and depending on the position the y carriage will crash on one end or another