Author Topic: Rack & Pinion gear  (Read 2755 times)

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bellsofchime

• Beginner
• Posts: 2
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.

nottoooily

• Full Member
• Posts: 91
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

bellsofchime

• Beginner
• Posts: 2
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???

bukowski

• Robot Overlord
• Posts: 219