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Offline Mogal

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Kernel Speed Question
« on: August 01, 2015, 02:58:20 PM »
Note: Software must be restarted and motors retuned if kernel speed is changed.

Just wondering what affect this has?
I've just updated my hardware and Xp to Win7.
The old computer ran at 25khz and could not run any faster.
The new hardware, I can run at 100khz.

Are there any Pros/cons to running faster or leaving the frequency at 25khz.
I did find my Z axis would lose steps at anything other than 25khz, no matter what speed was used.
And I'm guessing that 'retuned' means testing and resetting the steps per unit?

Thanks,
Chris

Offline ger21

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Re: Kernel Speed Question
« Reply #1 on: August 01, 2015, 03:25:32 PM »
Steps/unit never changes. When you change the kernel, you need to reset your accel and velocity settings.

As you increase the kernel speed, you're taking time away from the CPU to actually run windows itself. So as it gets faster, you may start to see stability issues in Windows.

Many people have reported smoother running motors at higher kernel speeds, but the author of Mach3 has always recommended using the lowest kernel speed to give you the speed that your motors need.
Gerry

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Offline Mogal

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Re: Kernel Speed Question
« Reply #2 on: August 01, 2015, 05:33:27 PM »
That's great Gerry, thanks once again.
I'll leave it at the lower setting then, as it still runs great where its at.

Cheers!
Chris

Offline beefy

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Re: Kernel Speed Question
« Reply #3 on: August 01, 2015, 07:18:11 PM »
Thanks Gerry,

I was wondering that very thing yesterday. My rapid speed is 10,000mm/min and my steps/mm are about 94.

Anyway that works out to be only under 16,000 steps/sec so I should be able to comfortably run at the lowest 25K kernel speed. Prior to this time I've always had it running higher thinking that would be "safer". I'll drop it down to 25K now and leave Windows with more time for other things. Can't have too much improvement in stability with Windows LOL.

Keith.