Confused again!

[Buba b]

So I've just sorted my duff maths in first post ! And it proves I can't make tea and post at the same time , anyways the manual gives an example of a servo :
Motor rotates one cycle every 5000 pulses and tool moves 10mm
CMR/CMD = 5000/(10x1000) = 1/2
CMR : Gear ratio numerator
CMD : Gear rato denominator

I'm running at 1/3 which gives me the 3mm over run , if your right and I need to put in 1600/5 then that would be great as I wouldn't have to frazzle my brain with maths. They just look big numbers compared to the manual and I never thought about it that way . Il try tomorrow see what happens .... Can't be that easy , it's Chinese !
Thanks

[johngoodrich]

So I've just sorted my duff maths in first post ! And it proves I can't make tea and post at the same time , anyways the manual gives an example of a servo :
Motor rotates one cycle every 5000 pulses and tool moves 10mm
CMR/CMD = 5000/(10x1000) = 1/2
CMR : Gear ratio numerator
CMD : Gear rato denominator

I'm running at 1/3 which gives me the 3mm over run , if your right and I need to put in 1600/5 then that would be great as I wouldn't have to frazzle my brain with maths. They just look big numbers compared to the manual and I never thought about it that way . Il try tomorrow see what happens .... Can't be that easy , it's Chinese !
Thanks

I would say yes it seems that would be right from their example, apart from where they put =1/2 because that doesn't add up but that could just be because its Chinese translation give it a try and let us know

[JAZZCNC]

I haven't seen the manual but I think you may be using the wrong parameter. Usually, Numerator/Denominator relates to gearing, it's often used in servos for electronic gearing.
So in your case, if you have no gearing then it will be 1/1. The actual pulse setting I'd expect to be in another parameter, often it's the encoder pulse parameters that dictate the output pulses per unit(mm) so it could be you need to enter 320 into the encoder parameters.? (might need to divide this by 4 if the parameter expects encoder base count as it will multiply x4 as it will assume your using quadrature encoders.!)

But without seeing the manual I could be way off.!!

[dazp1976]

I haven't seen the manual but I think you may be using the wrong parameter. Usually, Numerator/Denominator relates to gearing, it's often used in servos for electronic gearing.
So in your case, if you have no gearing then it will be 1/1. The actual pulse setting I'd expect to be in another parameter, often it's the encoder pulse parameters that dictate the output pulses per unit(mm) so it could be you need to enter 320 into the encoder parameters.? (might need to divide this by 4 if the parameter expects encoder base count as it will multiply x4 as it will assume your using quadrature encoders.!)

But without seeing the manual I could be way off.!!

I was thinking that last night.
The gearing is for if you are driving your motors/screws with reduction such as 2/1 belt & pulley. 1/1 being direct drive with no pulleys.