Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Robhi on April 17, 2013, 12:07:07 PM

Title: How could I calculate the step per revolution?
Post by: Robhi on April 17, 2013, 12:07:07 PM: Hello every body.

I have servo motor for my future cnc. I have the following kit servo motor:-
NEMA 34 Servo Motors 3 Axis CNC Kit:

NEMA34 Servo Motors 3 Axis CNC Kit(115VAC,230VAC):

3 PCS Geckodriver G320X, 80V/20A

3 PCS KL34-180-90 (NEMA 34) Dual Shaft, 1125 oz-in Peak 90V/40A

3PCS US Digital: E5-500-250-N-S-E-G-2 Individually
Packaged Shaft-Mount Optical 1/4" diameter shaft.
Molded mounting ears for 1.812" bolt circle (with
Installation Tool) for NEMA 34 Servo Motor

3PCS CA-FC5-SH-NC-6 Connector for 500 line or
250 line Encoder: 5-pin polarized conductor
shielded round 24 AWG cable. Standard
length is 6FT.

1 PCS KL-7220, 72V, 20A, Unregulated Power Supply, 110V/220V

1 pcs 5V Power Supply, 110V/220V

1 PCS C10 Breakout Board for 6 axis ( E-Stop or Limit Switch can be
wired)
I have a ball screw of 10mm pitch , with a pulley of 60 teeth on the screw. the second pulley which is mounted on the servo motor is 20 teeth, and the belt is T5. I also have Gecko 320x...

How could I calculate the step per revolution please?

I do not know if I give you all the information that you need.

thanks for you in advance for your help.

my unit is in mm.

thanks

Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Chaoticone on April 17, 2013, 12:31:18 PM: These should help.

http://www.machsupport.com/forum/index.php/topic,16315.0.html#new

http://www.machsupport.com/forum/index.php/topic,12512.0.html#new

Brett
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 17, 2013, 12:54:14 PM: Hello Brett,

thanks for your reply, but I only found a stepper calculator, and nothing about servo motors,
I do not know how to do it with servo motor.
Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Chaoticone on April 17, 2013, 01:01:45 PM: What is the line count of your encoders?

Brett
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 17, 2013, 01:04:57 PM: 500 lines

Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Chaoticone on April 17, 2013, 01:15:52 PM: OK your steps per rev on your motor will be 2000 then I'm guessing. (500 x 4 for quadrature)

Brett
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 17, 2013, 01:22:07 PM: ok I will try it later and let you know, thanks a lot for your great help.

Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Chaoticone on April 17, 2013, 01:28:52 PM: I get 6000 steps per mm

Brett
Title: Re: How could I calculate the step per revolution?
Post by: Chaoticone on April 17, 2013, 01:33:51 PM: Nope, I think 600 steps per. I just put 10 microsteps out of habit for geckos.

Brett
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 18, 2013, 07:24:42 AM: Ok Brett, thanks too much, i will try it, hoping it will be ok...

thanks again
Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 19, 2013, 05:16:19 PM: hello again, Brett and also other members too.

I have one or two questions please,
In the attached file (step per unit) I have to put 600 as you have told me, that is OK and it is so clear,
but what should I put , in the second attached file (encoder) in the count/unit as well as the velocity?
or should I let them empty? I guess it is so easy to let them empty LOL.

Thanks again for your help

Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Hood on April 19, 2013, 06:50:47 PM: You dont need anything there, they are meant for encoder inputs to Mach if you want to have them. They have to be low resolution or the parallel port wont see them and even then they are only for users information as Mach does not act on them.
Hood
Title: Re: How could I calculate the step per revolution?
Post by: Robhi on April 21, 2013, 02:24:56 PM: Hello,
Thanks Brett and Hood and all other members too,

I Have more one question please, it is about The kernel speed. what do you think please, should I change it to 35000Hz or only let it as it sis, 25000Hz?

thanks again

Robhi
Title: Re: How could I calculate the step per revolution?
Post by: Hood on April 21, 2013, 04:25:07 PM: If you dont need more than 25KHz then it is best not to use more. If however you require it for more velocity then you will have to use more.
Hood