## Re: OT rack and pinion Question

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• ... One rotation of the pinion engages 12 teeth and should result in 1 of movement. A 3.75 reduction means one rev of the motor would then result in .2666
Message 1 of 3 , Jan 31, 2006
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--- In mach1mach2cnc@yahoogroups.com, "Randy Taylor" <randyt26@y...>
wrote:
>
> Sorry for the off topic Question,
>
> I am building the machine tool camp router and the drive system is rack
> and pinion with 3.75 to belt reduction. The rack is 12 teeth per inch
> with 12 pitch and the pinion is 12 pitch and 12 teeth. would one a
> revolution of the pinion be 1 inch? Could a servo drive this with just
> 3.75 to one reduction?
> Sorry for the questions .
> Randy
>
One rotation of the pinion engages 12 teeth and should result in 1" of
movement. A 3.75 reduction means one rev of the motor would then
result in .2666 inches of movement. Now let's assume you want to run
your motor in the center of it's torque range and you have a 1500 RPM
motor. So the target is 750 RPM. At 750 RPM you will have a
respectable 200 IPM. A good speed for plamsa cutting, but a bit fast
for smaller router cutting.

All of the above makes certain assumptions about your motors. IF they
were to be higher RPM models and the center of the range is 1500 RPM
then you would really have to slow the RPM down for cutting at say 45
to 60 IPM.
Based on what you told us the combination could be from fair to poor
for a router application. What are the motors rated at for voltage
and torque? How heavy is your gantry? Are the slides low friction?

Never apologize for asking a question. I opens the floor for
discussion and many others learn from it.
• Caudlet well the kit specifies for 400 -700 Oz-in steppers, I belive he sells the servo info seperatly. I would expect the gantry to way about 75Lbs and I am
Message 2 of 3 , Feb 2, 2006
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Caudlet
well the kit specifies for 400 -700 Oz-in steppers, I belive he sells the servo info seperatly. I would expect the gantry to way about 75Lbs and I am using thk linear slides on all axis's. The spindle is a hitachi router. Thanks for confirming the ratio
caudlet <thom@...> wrote:
--- In mach1mach2cnc@yahoogroups.com, "Randy Taylor" <randyt26@y...>
wrote:
>
> Sorry for the off topic Question,
>
> I am building the machine tool camp router and the drive system is rack
> and pinion with 3.75 to belt reduction. The rack is 12 teeth per inch
> with 12 pitch and the pinion is 12 pitch and 12 teeth. would one a
> revolution of the pinion be 1 inch? Could a servo drive this with just
> 3.75 to one reduction?
> Sorry for the questions .
> Randy
>
One rotation of the pinion engages 12 teeth and should result in 1" of
movement. A 3.75 reduction means one rev of the motor would then
result in .2666 inches of movement. Now let's assume you want to run
your motor in the center of it's torque range and you have a 1500 RPM
motor. So the target is 750 RPM. At 750 RPM you will have a
respectable 200 IPM. A good speed for plamsa cutting, but a bit fast
for smaller router cutting.

All of the above makes certain assumptions about your motors. IF they
were to be higher RPM models and the center of the range is 1500 RPM
then you would really have to slow the RPM down for cutting at say 45
to 60 IPM.
Based on what you told us the combination could be from fair to poor
for a router application. What are the motors rated at for voltage
and torque? How heavy is your gantry? Are the slides low friction?

Never apologize for asking a question. I opens the floor for
discussion and many others learn from it.

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