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### Author Topic: Calculating Step For Mach  (Read 5591 times)

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#### McYoda

• 2
##### Calculating Step For Mach
« on: September 08, 2008, 03:17:18 AM »
I like how to calculate the step for Mach when using step motors. I plan to build another new machine using servo motor and gear rack.

The equipment would be like this.

Servo Motor RPM = 3200
Gear Rack = 20 DP
Pinion = 20 Teeth
GeckDrive = 320
Decoder = 500 CPR
Gearbox/belt = 9

I think that is everything I need. How do I get the steps for Mach?

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Calculating Step For Mach
« Reply #1 on: September 08, 2008, 04:21:59 AM »
What are you meaning by the Gearbox/belt = 9? is that a reduction of 9?
Without any gearing then 1 rev of motor moves 1 inch, one rev of motor is 2000 pulses (500 x 4) so that is what your steps per unit will be.
If you have a 9:1 gearing then it will need 9 revs to move 1 inch so Steps per would be 2000 x 9 = 18,000.
Hood

#### McYoda

• 2
##### Re: Calculating Step For Mach
« Reply #2 on: September 08, 2008, 10:49:07 AM »
Thank you for the clear explanation.

What are you meaning by the Gearbox/belt = 9? is that a reduction of 9?
Without any gearing then 1 rev of motor moves 1 inch, one rev of motor is 2000 pulses (500 x 4) so that is what your steps per unit will be.
If you have a 9:1 gearing then it will need 9 revs to move 1 inch so Steps per would be 2000 x 9 = 18,000.
Hood

#### writerson

• 15
##### Re: Calculating Step For Mach
« Reply #3 on: April 07, 2010, 05:49:44 PM »
in this calculation, how many step per do we need to turn this servo 3200 RPM ?

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Calculating Step For Mach
« Reply #4 on: April 07, 2010, 06:06:00 PM »
Depends what  line count your encoder is.
Hood

#### writerson

• 15
##### Re: Calculating Step For Mach
« Reply #5 on: April 08, 2010, 02:53:34 AM »
if we have 2000 line encoder,, how many step per do we need to turn this same servo motor 3200 RPM

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Calculating Step For Mach
« Reply #6 on: April 08, 2010, 03:28:01 AM »
If its a 2000 line encoder then that is 8,000 in quadrature so 8,000 x 3,200 = 25,600,000 pulses per min/60 = 426,666 pulses per second (426KHz)
If it was a 500 line encoder then it would be 2,000 x 3,200 / 60 = 106,666Hz (106KHz)

Hood
« Last Edit: April 08, 2010, 03:30:36 AM by Hood »

#### writerson

• 15
##### Re: Calculating Step For Mach
« Reply #7 on: April 08, 2010, 06:51:16 AM »
i understood that i'll need 426Khz for 2000 line - 8000 in quadrature for 3200 RPM ! but what will be the "step per" in this calculation ?  ( 8000 ? )

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Calculating Step For Mach
« Reply #8 on: April 08, 2010, 07:14:29 AM »
It all depends on what the pitch of the ballscrews are and if you have any reduction between the motor and the ballscrews.
Hood

#### writerson

• 15
##### Re: Calculating Step For Mach
« Reply #9 on: April 08, 2010, 07:43:10 AM »
i didnt mean any movement of axis.. i just mean, how many  "step per" do we need to turn motor 3200 RPM with 2000 line encoder.. we need totally 426,666 KHZ but.. what could we set "step per" from motor tuning to turn servo 3200 RPM ??