I could use some help

A Former User

@fcwilt I'm looking at the Status window? Y is currently at 34.5.

A Former User

@fcwilt I just moved the bed FORWARDS. Y is now at 124.5.

fcwilt

@fcwilt okay, I did a test. I clicked on Y-50 twice. That took the rear of the bed to the endstop (it hit it, versus touching it and backing away).

Where did the test start from? The fact that -100 took the rear of the bed to the endstop tells us nothing without knowing where the bed started from.

Frederick

fcwilt

@mac said in I could use some help:

@fcwilt I'm looking at the Status window? Y is currently at 34.5.

You cannot trust those numbers until you are absolutely sure the 100 is the correct value for Y in M92.

If M92 values are off everything the printer "says" and does will be off.

Frederick

A Former User

@fcwilt okay, here's something, I moved the Y-axis as far forwards as it would go. Status is saying I'm at 220.00.

The nozzle is 59 mm in front of the rear of the bed. So, for the nozzle to be at the back of the bed, the front of the bed has to go another 59mm. At which point Status should say Y is at 279.0.

A Former User

@fcwilt I understand what you're saying about how the numbers have to be exact. Being close would be a good beginning to that journey, I think.

A Former User

@fcwilt I just moved the nozzle to where I'd like the front of the bed to be. Status is reporting 62.0. I moved the bed as far forwards as it would go. I'm at 220.0 according to status, but I have another 59mm to go.

A Former User

@fcwilt im sorry this is so frustrating. For me as well. But based on what we’ve learned, I’m starting to see the problem spatially. So that’s helpful, to me, at least.

fcwilt

@mac said in I could use some help:

@fcwilt okay, here's something, I moved the Y-axis as far forwards as it would go. Status is saying I'm at 220.00.

The nozzle is 59 mm in front of the rear of the bed. So, for the nozzle to be at the back of the bed, the front of the bed has to go another 59mm. At which point Status should say Y is at 279.0.

Yes, one of the things I am trying to determine is if the M208 values you are using are correct.

As I mentioned if they are off then my homing code is off and will not work.

Here is what needs to be done.

double or triple check that jogging Y by a specified distance moves that distance when measured with a ruler. You cannot use the readout from the DWC.
once you are absolutely sure you can use the Y jog buttons to move known amounts we can then determine the max travel on the Y axis.
once we know that we can determine if the M208 values for the Y axis are correct.

To use jogging of Y to measure the max travel of Y is simple:

execute M564 H0 S0 (from the DWC console is fine) so you can jog the entire axis without being limited by the current M208 limits
jog the bed as far back as possible
execute G92 Y0
jog the bed as far forward as possible
read the current Y position as displayed by the DWC

Report the results. Fingers crossed again.

Frederick

fcwilt

@mac said in I could use some help:

@fcwilt im sorry this is so frustrating. For me as well. But based on what we’ve learned, I’m starting to see the problem spatially. So that’s helpful, to me, at least.

It can be tricky and sometimes it is hard to wrap your head around all the interacting bits.

IF I was sitting with you at the computer this whole thing would have been finished in about an hour. But having to communicate back and forth slows things down.

But we are getting closer.

Frederick

A Former User

@fcwilt yes, I agree, we are. I’ll use a metal ruler I have. It hasn’t changed in 70 years.

fcwilt

@mac said in I could use some help:

@fcwilt yes, I agree, we are. I’ll use a metal ruler I have. It hasn’t changed in 70 years.

DRAT and DOUBLE DRAT.

I posted M92 when it should have been G92.

DO NOT ENTER M92 Y0.

IF you do just re-boot the machine and be sure and use G92 and the specified point in the process.

Frederick

A Former User

@fcwilt sorry? are you saying that the changes I made to Y were supposed to be in another line?

A Former User

@fcwilt where's this G92?

fcwilt

@mac said in I could use some help:

@fcwilt sorry? are you saying that the changes I made to Y were supposed to be in another line?

This part here:

To use jogging of Y to measure the max travel of Y is simple:
- execute M564 H0 S0 (from the DWC console is fine) so you can jog the entire axis without being limited by the current M208 limits
- jog the bed as far back as possible
- execute G92 Y0
- jog the bed as far forward as possible
- read the current Y position as displayed by the DWC

The G92 above was original posted as M92 which was wrong, wrong, wrong and would have messed up the entire process.

I have corrected the original post and re-posted it here.

As long as you have not started this process listed above all is good.

Frederick

A Former User

@fcwilt I haven't even started measuring again. I did turn the printer off so I could move the bed back to the end-stop. I'd like to use that 0-point to measure from. But getting to it is brutal!

fcwilt

@mac said in I could use some help:

@fcwilt I haven't even started measuring again. I did turn the printer off so I could move the bed back to the end-stop. I'd like to use that 0-point to measure from. But getting to it is brutal!

Understood.

And it's true that the longer move you measure the less slight inaccuracies in the measurement will affect the results.

One good measurement is all you should need to verify the the Y setting of 100 in the M92 command is the correct value for your printer.

At least my mistake with G92 was corrected in time and you didn't get messed up by it. That's a relief.

Frederick

A Former User

@fcwilt OKAY, I've moved the bed back, right to the point where the endstop clicks. I've taped the metal ruler to the frame. The beginning of the measure is absolutely lining up with the very back of the metal bed.

So, I had to Home Y to get the machine movement points back. The bed was already right at the switch, but it decided to pound on the motor for a bit, then it stopped.

With the movement buttons back, I jogged the bed forwards 10 times (Y+10 each time). The front of the bed is at 12 and 7/8 right now. If it had started at the endstop, I think it would be at 13 inches exactly right now.

A Former User

@fcwilt 13 inches of travel is 300mm. We're talking round numbers, Frederick!

fcwilt

@mac said in I could use some help:

@fcwilt OKAY, I've moved the bed back, right to the point where the endstop clicks. I've taped the metal ruler to the frame. The beginning of the measure is absolutely lining up with the very back of the metal bed.

So, I had to Home Y to get the machine movement points back. The bed was already right at the switch, but it decided to pound on the motor for a bit, then it stopped.

With the movement buttons back, I jogged the bed forwards 10 times (Y+10 each time). The front of the bed is at 12 and 7/8 right now. If it had started at the endstop, I think it would be at 13 inches exactly right now.

I really don't quite understand what you did but that doesn't matter as long as...

You are satisfied that the Y value of 100 for M92 in the config.g file is correct.

If you are we can proceed to measure the Y axis.

Frederick