# Mach4 Spindle Frequency Settings?

**URL:** <https://forum.avidcnc.com/t/mach4-spindle-frequency-settings/2636>\
**Category:** General Chat\
**Created:** [November 11, 2023, 12:05pm UTC](https://forum.avidcnc.com/t/mach4-spindle-frequency-settings/2636 "2023-11-11T12:05:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Arcrunner](https://avatars.discourse-cdn.com/v4/letter/a/ed655f/32.png) [@Arcrunner](https://forum.avidcnc.com/u/Arcrunner)\
**Post date:** [November 11, 2023, 12:05pm UTC](https://forum.avidcnc.com/t/mach4-spindle-frequency-settings/2636/1 "2023-11-11T12:05:08Z")

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Hi All,  
I am setting up a second machine with a spare spindle and VFD, but with Avid electronics and wanted to verify something regarding the ESS spindle Frequency.

![image](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/e/e1a223e335563c015356eabb028897712933566c.png)

From my understanding, this is what the AVID BoB’s 0-10v converter is expecting in regards to frequency, and has nothing to do with the spindle’s operating frequency, correct?

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**Author:** ![jjneeb](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/jjneeb/32/244_2.png) [@jjneeb](https://forum.avidcnc.com/u/jjneeb)\
**Post date:** [November 11, 2023, 3:02pm UTC](https://forum.avidcnc.com/t/mach4-spindle-frequency-settings/2636/2 "2023-11-11T15:02:35Z")

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Correct, thats the base frequency of the PWM signal. It is a fixed frequency and the setting is related to the PWM to analog voltage converter circuit thats being used on the BOB. The spindle speed itself is controlled by the duty cycle (thats the essense of PWM).