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### Author Topic: Multiply Feed rate?  (Read 2002 times)

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#### Rikk

• 19
##### Multiply Feed rate?
« on: July 25, 2011, 03:10:23 PM »
I have pulleys on each axis giving me a 2:1 ratio, is there a way in mach3 I can tell it this is the case, otherwise I'm assuming if in the .nc file I specify a feed rate of 200 I'm actually getting 100?

Thanks

...............Rikk

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Multiply Feed rate?
« Reply #1 on: July 25, 2011, 03:43:23 PM »
That is done by your steps per unit in Motor Tuning. You work out how many steps it will take to move the axis 1 unit, for example 200 steps for stepper x 10 microsteps of drive x 2 for gearing would equal 4000 steps per 1 rev of screw. If your screw was 10 tpi then it would need 10 turns of screw to move 1 inch so the previous number would be multiplied by 10 to give you the steps per inch, 40,000 in this example.
Hood

#### Rikk

• 19
##### Re: Multiply Feed rate?
« Reply #2 on: July 25, 2011, 03:53:03 PM »
Ahhh course....doh sorry.

Yep that's all set up, teach me to ask questions when I'm tired

#### Hood

• 25,838
• Carnoustie, Scotland
##### Re: Multiply Feed rate?
« Reply #3 on: July 25, 2011, 03:55:31 PM »

Hood