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Author Topic: tuning steppers in mach 3  (Read 10218 times)

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tuning steppers in mach 3
« on: November 20, 2006, 10:07:10 AM »
if i have a gecks g201 and 270 oz rex step steppers and 24v 4.5 amp   im trying to get in the ball park is 500 and 40 way off or am i creeping to the sweet zone i just see on here some guys with xylotec boards  have accel around 16  just wondering if im way off or not
does lower accel give you more torque

John
st.louis,mo

Offline Chaoticone

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Re: tuning steppers in mach 3
« Reply #1 on: November 20, 2006, 03:16:41 PM »
Hey John,
    Lower accel will not give you more torque. The accel will help you keep from loosing steps. It is just like you pushing a car and pushing a bike. You can probably push them both at the same speed. It will just take you longer to get the car from stop to max than it would the bike. You will just have to play with motor tuning to find what your machine will do. Uping your Voltage to the motors will give you more torque.
;D If you could see the things I have in my head, you would be laughing too. ;D

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Re: tuning steppers in mach 3
« Reply #2 on: November 20, 2006, 03:39:51 PM »
BIG yes on upping the voltage.
I went from 17 to 24 and it made a HUGE differance.
Re: tuning steppers in mach 3
« Reply #3 on: November 20, 2006, 04:16:03 PM »
so  an accel of 40 or 50 isnt unheard of  on 270 oz steppers i just need to up the voltage is this correct
do you think if i try between 36 and 42 that wont be to much

John
Re: tuning steppers in mach 3
« Reply #4 on: November 20, 2006, 04:18:23 PM »
First we need to know the voltage rating thats on your stepper motor.

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Re: tuning steppers in mach 3
« Reply #5 on: November 20, 2006, 04:19:37 PM »
Do you have any spec sheets, info on your steppers? Running 75-80V on a stepper is common.

The 201s are rated at 80V max.
« Last Edit: November 20, 2006, 04:23:24 PM by Chaoticone »
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: tuning steppers in mach 3
« Reply #6 on: November 20, 2006, 05:35:56 PM »
right now im running  3 of them at 24v 4.5 amp power supply



Operation
 Holding torque-Nm (oz/in) +/- 10%  262
 Rated voltage 3.2
 Rated current per phase (amps DC) 2.8
 Resistance (Ohms) +/- 10% 1.13
 Induction (mH) +/- 20% typical 3.6
 Motor length (mm) 76
 Rotor inertia (g-cm^2) 480
 Weight (kg) 0.92
 

 


 
 

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Re: tuning steppers in mach 3
« Reply #7 on: November 20, 2006, 06:58:16 PM »
65-80 volts would be nice. Check out this link. ;D

http://www.campbelldesigns.com/files/power-supply-part-1.pdf
« Last Edit: November 20, 2006, 07:08:01 PM by Chaoticone »
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: tuning steppers in mach 3
« Reply #8 on: November 20, 2006, 08:43:25 PM »
you know i seen that 3.62 rated volts on the homeshop cnc web site but i could swear when i bought them it was 1.62  man that just seems like alot of volts for those little nema 23  i got a 48 volt power supply downstairs that came out of a centroid controller maybe ill try that before i sink some money on a new transformer  thanks for the help  ill let ya know what happens

John
st.louis,mo

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Re: tuning steppers in mach 3
« Reply #9 on: November 20, 2006, 08:54:11 PM »
John,
    Steppers like it hot. They are designed for heat. The 48 will be twice as nice. You may not want more than that. I would want at least 75. ;D The only reason I wouldn't go 90  :o is because of the rating on the geckos.
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!