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Author Topic: Loosing steps when milling slowly  (Read 10138 times)

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Online Tweakie.CNC

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Re: Loosing steps when milling slowly
« Reply #20 on: March 11, 2011, 05:36:41 AM »
What make and model driver board are you using for your steppers ?

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

Offline RICH

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Re: Loosing steps when milling slowly
« Reply #21 on: March 11, 2011, 05:51:37 AM »
Post info on your driver and motors.
What is the amp and voltage output of your power supply?
RICH
Re: Loosing steps when milling slowly
« Reply #22 on: March 11, 2011, 04:38:39 PM »
Hi.
My driver: http://cgi.ebay.com/CNC-3-Axis-Stepper-Motor-Driver-Controller-Board-TB6560-/270705528552?pt=LH_DefaultDomain_0&hash=item3f074e8ee8
the steppers: M57STH76-2808D-1 from: http://www.motioncontrolproducts.co.uk/products/2/5/nema_23_high_torque_stepper_motors/

Power supply is 24vdc 10A.

I know the driver is a bit cheap, but i am low on cash, and i have used a board a bit like this to drive a proxxon MF70 without any problems (using kcam).

I just don't get it.. it drives fine when running 1000 mm/min but runs like ********* when running for example 500mm/min.

Offline Hood

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Re: Loosing steps when milling slowly
« Reply #23 on: March 11, 2011, 05:11:41 PM »
What microstepping do you have set?
Hood
Re: Loosing steps when milling slowly
« Reply #24 on: March 11, 2011, 05:14:34 PM »
i have set it to 1/16 right now, but have tried with 1/8 and 1/2...

Offline Hood

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Re: Loosing steps when milling slowly
« Reply #25 on: March 11, 2011, 05:18:14 PM »
Is it all motors that are weird?
Hood
Re: Loosing steps when milling slowly
« Reply #26 on: March 12, 2011, 12:53:32 AM »
Yes all of them... they run quite smooth at 1000mm/min. But still looses some steps, but not like when running half the speed. But 1000mm/min is a bit to fast for cutting some materials.

Offline Hood

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Re: Loosing steps when milling slowly
« Reply #27 on: March 12, 2011, 04:15:14 AM »
what if you go half again?
Hood

Offline RICH

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Re: Loosing steps when milling slowly
« Reply #28 on: March 12, 2011, 05:07:21 AM »
Quote
i have used a board a bit like this to drive a proxxon MF70 without any problems (using kcam).

Was it the same board and machine along with  the same drive  settings  you are using now and did you try slow speeds at that time when using Kcam via the PP?
Post your xml file.

RICH
Re: Loosing steps when milling slowly
« Reply #29 on: March 13, 2011, 02:29:15 PM »
It was not the same board, just a similar one... The settings are different, because it is a different machine. Slow speeds with the other cnc and kcam was possible without any problems.

I just tried to set the microstep back to ½ step. Apparently it works better... not loosing so many steps. But I just tried it quick, i will do an attempt some day next week to see if it really helps.

But is it normal that steppers runs smoother at high speeds?