Painful homing following GRBL 1.1 Upgrade

CNC Machines Shapeoko
1

After installing GRBL 1.1 my homing procedure has changed.

First the Z axis homes at the usual speed and then backs off the 5mm, but then it proceeds to repeat the whole homing movement but at a loud and very slow speed.

Then both the X and Y axes do the same thing. Normal speed home movement and back off, then loud slow speed re-homing and back off.

I have double and triple checked my GRBL settings line by line for my XXL with those listed on the Carbide site and they match.

I’ve downloaded and installed UGS V. 2.0… Same results.

It’s kinda hard to listen to. It sounds like the gantry is in pain.

Anyone have any ideas what might be causing this?

Thanks

2

It’s just doing a slower motion to “dial in” the position of the switch. Without hearing what you’re hearing, I’d say it’s normal, meant to improve repeatability.

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3

Hey Neil,

Thanks for the quick reply. I’ve been using the XXL since 2016 with GRBL .09 and UGS V1.09 and never had an issue with this.

Assuming you use GRBL 1.1, does your machine double home? This is totally new to my machine.

Thanks again,
Bill

4

Yes, I believe it was added with 1.1.
Your $24 is the speed it’s moving after the initial $25 seek rate.

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5

Thanks Neil,

It’s 1:20 am and I’m getting blurry eyed. I’m gonna do some reading on that tomorrow at https://github.com/gnea/grbl/wiki/Set-up-the-Homing-Cycle.

Thanks again,
Bill

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6

My 18 month young XXL does the same thing after flashing to 1.1 Soon enough you’ll get used to this “new normal” :wink:

7

Thanks for the note Darren.

I’ve heard of the second coming, but this second homing makes me grit my teeth. :slight_smile: It just doesn’t feel right.

I do feel a tiny bit better hearing someone else is experiencing the same thing.

Thanks again.
Bill

8

Same exact thing with my XXL after the upgrade. It doesn’t sound right to me, but it can’t be skipping on the belt or anything because jobs all run correctly.

9

I’m pretty sure you’re just hearing the stepper running at a really slow rate.

10

Thanks F B.

I feel better knowing others are experiencing the same thing.
But, I don’t have to like it. :crazy_face:

Thanks again.

11

Hey Neil,

You mentioned earlier the $24 and $25 settings.

Not that I would change either without someone a lot more experienced than me saying it would be OK, but would increasing the $25 make any difference?

Edit… Make that the $24. Currently $25=1500, $24=100.

12

You could change that to whatever you’d like. It just changes the feed rate for homing. Theoretically, the slower it is, the more accurate your homing results will be.
Your motors are fine. Steppers make noises when they move. Many, myself included, get a kick out of hearing our stepper motors play music.

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13

Thanks Neil,

Your input is greatly appreciated.

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14

I’ll try to get a video of mine on the next job I run. It is not typical stepper motor noise. This sound is similar to what you hear if you are zeroing the z and accidently run it into the work piece.

15

You can certainly change them. $25 is the “seek” rate - it runs at this rate until it hits a switch. Setting it too high can really slam the carriage into the stops- I used to use 5000. I currently use $25=2000, and $24=100, with a pull off, $27=5mm

16

Okay, I pulled my little Shure VP83F out and threw it on a camera with no production values allocated to the image. I repeated $H in the MDI window over and over to dial up the gain on the mic to just shy of clipping, then recorded one cycle for auditory comparison:

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17

Correct-a-Mundo!!! That’s it. :star_struck:

Totally new to my machine since 1.1 update. Guess we’re stuck with it, but it’s still a bit unsettling.

Thanks for taking the time Nathaniel.

Bill

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