I could use some help

fcwilt

@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

@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

@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.

@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

@fcwilt It makes sense, let's go with it.

fcwilt

@mac said in I could use some help:

@fcwilt It makes sense, let's go with it.

OK

This is next.

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

When jogging near the ends try to "sneak" up on the ends so you don't over shoot them. The firmware will think the move happened even if the bed stayed still.

Frederick

@fcwilt I'm going to follow your instructions, and I'll report them to you as soon as I have them. Just hang on, we'll get there.

@fcwilt Y is EXACTLY 350!

fcwilt

@mac said in I could use some help:

@fcwilt Y is EXACTLY 350!

Does it seem possible that the bed actually moved 350mm?

Frederick

@fcwilt THE FRONT OF THE BED IS AT 18 INCHES FROM WHERE IT STARTED.

@fcwilt 18 inches is 457.2 mm.

@mac ![alt text]( image url)

@fcwilt The bed started at 0 inches, and travelled to 18 inches. DWC called it 350.0. It's 18 inches. All of the numbers are whole numbers. We're golden.

fcwilt

@mac said in I could use some help:

@fcwilt THE FRONT OF THE BED IS AT 18 INCHES FROM WHERE IT STARTED.

But 18 inches is 457.2 mm - how is that possible?

Frederick

@fcwilt I have an inches to metric calculator doing that for me.

@fcwilt link text

fcwilt

@mac said in I could use some help:

@fcwilt I have an inches to metric calculator doing that for me.

No I mean if the bed actually moved 18 inches which is 457.2 mm the DWC should read the same 457.2 mm, assuming the DWC was reading 0 when you started. Which is should have since you execute G92 Y0.

Frederick

@fcwilt maybe the question is, what is the relationship between DWC reporting 350, and my metal measuring stick reporting 18 inches?