1. i need help on calculating the pulse equivalent for rack and pinion system and ball screw system....thnx

2. Originally Posted by yasser
i need help on calculating the pulse equivalent for rack and pinion system and ball screw system....thnx

3. hiii i built a cnc router ,i used rack and pinion for the x and y with gear ratio 1:5 and ball screw for the z with gear ratio 1:3 i am ysing a dsp hand controllrer the problem is the distance moved by the machine is not exact like the drawing it is as if it is scaled larger by 10%...there is a setting in the dsp hand that requires a parameter which is the no of pulse needed to move the machiene 1 mm pulse/mm so i guess there is a formula for rack system and another for ballscrew to calculate this parameter..thnx

4. break this down into steps first. Working on Metric system.

#1 Need Shaft Revs per Unit. So need tooth pitch(TP) and number of teeth on Pinion(PT). Shaft Revs per unti = 1 / (TP * PT)
So example working on Mod 1 with 24 Teeth: Shaft revs per unit = 1 / (1 * 24) =0.0416

#2 Motor Revs per unit With Ratio. For this we need number of teeth on Motor (MT) This is Motor Revs per unit = Shaft Revs per unit * PT / MT
Example 0.0416 * 24 / 12 =0.0832

#3 Steps Per Unit= Motor Revs * Microsteps. Example 0.0832 * 2000= 166.40 Steps per

5. ## The Following User Says Thank You to JAZZCNC For This Useful Post:

6. Originally Posted by yasser
i need help on calculating the pulse equivalent for rack and pinion system and ball screw system....thnx

Use this calculator:

http://mycnc.co.uk/coding/AxisCalculator.zip

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