# Z-Axis Movement is off by 8 times more than expected

**URL:** <https://forums.maslowcnc.com/t/z-axis-movement-is-off-by-8-times-more-than-expected/11106>\
**Category:** Software\
**Created:** [September 11, 2019, 11:33pm UTC](https://forums.maslowcnc.com/t/z-axis-movement-is-off-by-8-times-more-than-expected/11106 "2019-09-11T23:33:48Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fablabfortsmith](https://avatars.discourse-cdn.com/v4/letter/f/ea666f/32.png) [@fablabfortsmith](https://forums.maslowcnc.com/u/fablabfortsmith)\
**Post date:** [September 11, 2019, 11:33pm UTC](https://forums.maslowcnc.com/t/z-axis-movement-is-off-by-8-times-more-than-expected/11106/1 "2019-09-11T23:33:48Z")

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I’ve been having a lot of issues with my Z-Axis plunging way too far into the wood. So I spent the day learning about G-code and trying a variety of different programs to see if any of them acted any different. I was finally able to narrow down and repeat the issue; though not sure where I need to look in order to fix it.

In the Z-Axis dialog box, I did the following:

- I zeroed out the bit to the wood, and it is always very repeatable.
  - On the side of the Z-Axis I marked a line where the zero is at.

- With each test, I clicked the Go to Zero button and marked on the side of the Z-Axis where the router stopped at.
- I get the following results with the values shown when I click the RAISE button
  - the router moves 1.5” with a value of 0.2 INCHES
  - the router moves 1.875” with a value of 0.25 INCHES
  - the router moves 2.25” with a value of 0.3 INCHES
  - the router moves 40mm with a value of 5 MM
  - the router moves 53mm with a value of 6.5 MM
  - the router moves 59mm with a value of 8 MM

I was able to get similar results using G-code where I just plunged the router into the wood…

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**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\
**Post date:** [September 12, 2019, 3:01am UTC](https://forums.maslowcnc.com/t/z-axis-movement-is-off-by-8-times-more-than-expected/11106/2 "2019-09-12T03:01:50Z")

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change the leadscrew pitch in your config.

this post doesn’t give any information about what you have it configured to be  
or what your Z axis is, so other than noting that this setting doesn’t match  
your machine, it’s impossible to know what it should be

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**Author:** ![fablabfortsmith](https://avatars.discourse-cdn.com/v4/letter/f/ea666f/32.png) [@fablabfortsmith](https://forums.maslowcnc.com/u/fablabfortsmith)\
**Post date:** [September 12, 2019, 2:28pm UTC](https://forums.maslowcnc.com/t/z-axis-movement-is-off-by-8-times-more-than-expected/11106/3 "2019-09-12T14:28:27Z")

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Yup, that’s exactly what it was. I changed it from the default value of 3.17 to 19.8 and now it drills down to within 0.08 mm