Messages

21

General Mach Discussion / Is this a suitable power supply

« on: April 20, 2014, 02:02:50 PM »

Hi,

I have bought a http://www.cnc4you.co.uk/index.php?route=product/product&product_id=280 48V 12A CNC Power Supply

Do you think that this power supply is too higher voltage for the kit i have, 3 nema 23's and 1 nema 17

I have attached the spec on the 3 nema 23 motors and the motor driver


Thank you

22

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 20, 2014, 01:14:28 PM »

I wound down the current on the 23's it made them smoother, there is a pot on the driver board, with current markers, you can set it with a voltmeter, mine are now .8v

23

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 20, 2014, 09:47:07 AM »

its not the shielded cable, mine doesn't reset all axis to zero after auto homing, but i wouldn't expect it too

After you auto home, move x and y axis to say Z 50 and X 50, then press zero x and zero y buttons , you can do the same with z axis

after all 3 are zeroed move the axis's to a new location, then press the goto zero, i am not sure you really need the axis set to zero after rehoming, as far as i know you would normally move all 3 axis to the work zero point and then press zero x, zero y button and z zero button, this is now your working zero, and goto zero will take to back to your work starting point.


i might be wrong

24

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 20, 2014, 06:23:28 AM »

I have just checked  the 2mm pitch on the y axis pulley is 30t

so both steps / mm should be around 53.333


http://calculator.josefprusa.cz   this is handy

25

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 20, 2014, 04:13:12 AM »

I have

Y Axis 36 tooth  pulley @ 2mm pitch, the steps/mm are 53.8354 vel: 10000 acc 125
X axis 20 tooth pulley @ 3mm pitch, 53.7268 gel: 20000 acc 125

26

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 20, 2014, 03:28:15 AM »

What gears are you using on the y axis?

27

General Mach Discussion / Re: Axis Problem

« on: April 19, 2014, 03:59:28 PM »

I also wound down the amps on the Nema 23's to 1.8A, all seems to be working well now

28

General Mach Discussion / Re: Axis Problem

« on: April 19, 2014, 01:28:29 PM »

Thank you Hood, I have sent them an email today.

I swapped the motor drivers over Y axis with the A axis , and strangely enough it has started working, will do more testing later to see if its reliable.

Thank you for your help

29

General Mach Discussion / Re: Machine wont zero after Homing

« on: April 19, 2014, 09:11:40 AM »

Hello Martin,


I am using the 60khz version of the same card and the same Stepper Motor Driver, i had the skipping problem too, i set the motor driver on the nema 23's to 1/16 and 10000mm/m and acceleration to 125
I also switched to vista, that made a difference, for some reason a clean install of vista made a big difference, try doing a clean install of your OS and see if that helps.


My problem that Hood is looking at is, after moving away from the homing switch after homing the A axis won't stop moving away 

John

30

General Mach Discussion / Re: Axis Problem

« on: April 19, 2014, 07:09:17 AM »

Thank you Hood