Author Topic: Rack & Pinion gear  (Read 3289 times)

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Offline bellsofchimeTopic starter

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Rack & Pinion gear
« on: April 15, 2010, 02:51:17 PM »
As a part of our assignment we were asked to do the analysis of a rack and pinion gear used in a CNC milling machine.
I really get confused of how the forces would act on the pinion and how would I determine the equivalent inertia of the gear system.

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Offline nottoooily

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Re: Rack & Pinion gear
« Reply #1 on: April 16, 2010, 03:50:56 AM »
rotational inertia for a point mass is
I = r^2 m
You can treat the rack as a point mass at radius equal to the radius where the teeth contact.

Similarly, if you know the force on the rack, the torque on the pinion is
torque = F r
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Offline bellsofchimeTopic starter

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Re: Rack & Pinion gear
« Reply #2 on: April 16, 2010, 04:58:46 AM »
Again, I have to find the Viscous friction for the system. I have been given Z axis viscous friction, Motor viscous friction and Gear head viscous friction. Please do help me with this term GEARHEAD in a rack and Pinion. and what is gearhead ratio 'N'....how to find it??? ???
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Offline bukowski

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Re: Rack & Pinion gear
« Reply #3 on: April 18, 2010, 01:20:33 AM »
The gear head is another name for the gear box, I believe. N would be whatever the gear reduction is.
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