# TMC autotune: help with motor specs and unknown extruder

**URL:** <https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975>\
**Category:** Sovol SV06 ACE\
**Tags:** klipper\
**Created:** [February 20, 2025, 8:08am UTC](https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975 "2025-02-20T08:08:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tverdyy](https://avatars.discourse-cdn.com/v4/letter/t/73ab20/32.png) [@tverdyy](https://forum.sovol3d.com/u/tverdyy)\
**Post date:** [February 20, 2025, 8:08am UTC](https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975/1 "2025-02-20T08:08:08Z")

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Hey everyone,

I’m trying to get the most out of my Klipper setup and I’m interested in using the TMC autotune addon. To make it work, I need to gather some information about my stepper motors, but I’m having trouble finding the specs.

I’ve got the following motors installed:

- Z-Axis: Shengyang 42BYGH1634-A-20Db
- Bed: Shengyang 42BYGH3043-A-24DN
- X-Axis: Shengyang 42BYGH2265-A-24DN
- Extruder: Unknown model (if anyone has any tips on how to identify it, I’d appreciate the help)

To populate the motor\_database.cfg file, I need to know the following values for each motor:

- Resistance (Ω)
- Inductance (mH)
- Holding torque (Ncm)
- Max current (A)
- Steps per revolution

Could anyone help me out with the specs for these Shengyang motors, or point me in the direction of a reliable source? I’d also appreciate any suggestions on how to identify my extruder motor model.

Thanks in advance for any help or guidance you can provide!

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**Author:** ![mich0111](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/mich0111/32/1176_2.png) [@mich0111](https://forum.sovol3d.com/u/mich0111)\
**Post date:** [February 20, 2025, 8:11am UTC](https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975/2 "2025-02-20T08:11:02Z")

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Hi,  
Ask Sovol at [info@sovol3d.com](mailto:info@sovol3d.com).  
They’ll get back to you within a week.

@sovol3d

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**Author:** ![tverdyy](https://avatars.discourse-cdn.com/v4/letter/t/73ab20/32.png) [@tverdyy](https://forum.sovol3d.com/u/tverdyy)\
**Post date:** [February 20, 2025, 8:13am UTC](https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975/3 "2025-02-20T08:13:08Z")

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Thanks for the tip! I’ll reach out to Sovol at [info@sovol3d.com](mailto:info@sovol3d.com) and see if they can provide me with the necessary information. I’ll make sure to share the specs here in the forum once I receive them, so that others with the same motors can benefit from it. Appreciate your help!

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**Author:** ![bfroxen](https://avatars.discourse-cdn.com/v4/letter/b/bcef8e/32.png) [@bfroxen](https://forum.sovol3d.com/u/bfroxen)\
**Post date:** [February 26, 2025, 5:25am UTC](https://forum.sovol3d.com/t/tmc-autotune-help-with-motor-specs-and-unknown-extruder/6975/4 "2025-02-26T05:25:24Z")

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I reached out to Sovol a while back and received these. While waiting, I [tuned my motors another way](https://forum.sovol3d.com/t/stepper-motor-tuning/6740/5), so I never really looked at them.

 ![image](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/9/9e68657e89af37b5d3ffb574c34f44d69f0094a0.jpeg)  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/0/025f2fa59eed6f0c350d0cf46d52b0df98caaa5c.jpeg)