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Author Topic: Kernel speed set to high on z axis and will not save calibration.  (Read 5277 times)

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Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #10 on: July 09, 2013, 11:07:30 AM »
Ok so I was trying to calibrate again. I tell it to move 30 "units" which should be mm as I set that up in the config. So it moved about 26 not bad but not close enough. So it asked and I put in 26 and it calculated a new steps and I accepted it. Then I closed down and re started Mach3. Checked that it was in there and it was. Did a calibration, for 30 again. It moved less than it did before. Then it wants to set it higher  and higher each time as it moves less.
What am I missing?? It moves but not enough. I even set it really low to 600 steps and it still didn't work or go far enough. WTF??

Please anyone with ideas?? If you need more info simply ask as I am not sure what you might need.

Thanks.

Andrew

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Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #11 on: July 09, 2013, 11:25:45 AM »
Sounds like your axis is losing steps, could be due to binding or maybe even the pulse width not enough. Try with Sherline Mode enabled and see if that helps.
Hood
Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #12 on: July 09, 2013, 11:58:09 AM »
Ok so I used the Sherline mode and it got a lot better. But I still couldn't get consistent distances. SOunds like the steps are being missed. It is a cheap Ebay TB6560 board. But is there any other settings that could be doing it as well?? (I think a Gecko is looking better everyday..)

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Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #13 on: July 09, 2013, 01:49:47 PM »
Might be worth trying 8 microstepping if its available.
Hood
Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #14 on: July 09, 2013, 03:00:57 PM »
Ok further developments. I upped the kernel speed to 65000 and it seems to really like it and it seems to give consistent distances. Should I just go to the max kernel speed??

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Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #15 on: July 09, 2013, 03:30:30 PM »
What does the frequency and Time in Int read on Diagnostics page when running at both 25KHz and 65KHz, you must restart Mach after you change the kernel for that to read correctly.
Hood
Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #16 on: July 09, 2013, 08:47:25 PM »
I checked it at both 65000 and 100000 as well and it reads between 5.2 and 4.5 or so each time. So now it's at 100000 and seems to work really well. I calibrated again and it does it right on, well as far as a ruler can tell but good for now until I do it better.
Thanks for your help!

Andrew

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Re: Kernel speed set to high on z axis and will not save calibration.
« Reply #17 on: July 10, 2013, 03:07:26 AM »
If your system is happy then go for it but be aware that you may have issues due to the high kernel.
Your Time in Int is reasonably low so you may be OK but it is still 50% or so of the the interrupt when at 100KHz so you are getting close to the edge.

Hood