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Author Topic: feed rate behavior  (Read 7109 times)

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Offline Pratyeka

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Re: feed rate behavior
« Reply #10 on: November 13, 2009, 09:58:27 PM »
Recently bought Mach3 R3.042.032
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Offline Tweakie.CNC

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Re: feed rate behavior
« Reply #11 on: November 14, 2009, 05:41:32 AM »
Could it be exactly the opposite to what I have said before and your PC is running too fast ?.

This link may be of interest:-

http://www.machsupport.com/forum/index.php/topic,11921.0.html

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline Pratyeka

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Re: feed rate behavior
« Reply #12 on: November 14, 2009, 11:13:15 AM »
Interesting! Will try to slow down the cpu as soon as I fix the power supply of the CNC. Apparently the bridge rectifier need to be mounted to a heat sink when driven above 3 amp... The supplier forgot to mention that. Replacing it with a 25 amp.

Where can I get the XP optimization file?
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Offline Tweakie.CNC

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Re: feed rate behavior
« Reply #13 on: November 14, 2009, 11:29:49 AM »

Bottom of this page :-

http://www.machsupport.com/downloads.php

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: feed rate behavior
« Reply #14 on: November 14, 2009, 12:01:44 PM »
There is absolutely *nothing* to be gained by running the Mach3 kernel speed any faster than the fastest step rate you require.  All it does it eat up CPU bandwidth, and potentially create problems.  Few machines seem capable of running reliably long-term above a 45kHz kernel rate, regardless of what the driver test indicates.  If it works at 35kHz, and gives you the rapid speeds you need, then run it at 35kHz.  Going faster buys you nothing at all.

Regards,
Ray L.
Regards,
Ray L.

Offline Pratyeka

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Re: feed rate behavior
« Reply #15 on: November 14, 2009, 04:43:16 PM »
There is absolutely *nothing* to be gained by running the Mach3 kernel speed any faster than the fastest step rate you require.  All it does it eat up CPU bandwidth, and potentially create problems.  Few machines seem capable of running reliably long-term above a 45kHz kernel rate, regardless of what the driver test indicates.  If it works at 35kHz, and gives you the rapid speeds you need, then run it at 35kHz.  Going faster buys you nothing at all.

Regards,
Ray L.
Thanks for the info. But this is moot since I get the problem from 25khz on... changing to higher frequencies was just done for troubleshooting.
« Last Edit: November 14, 2009, 04:47:45 PM by Pratyeka »
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