stepper settings/ calculation set up

go it figured out. it helps writing out all the steps of the calculations.
Thanks again guys for all the help.

Nice.
You are welcomed.

Todd Zuercher wrote: Racks (non metric ones at least) are usually specified in diametrical pitch, This means that a 20 pitch pinion of 1 inch diameter would have 20 teeth and the matching rack would have 20 teeth cover pi inches (about 3.14 inches). So one rev of your 22 tooth pinion should travel 22(pi)/20 inches.

You guys really do it the hard way. In all the other contries in the world (minus one other obscure one) metric makes it so much easier

Take Tommy's module 2, 20 tooth pinon,

The diameter is 2 * 20 = 40mm
The Circumference (distance travelled) is 40mm * pi = 125.66mm

The silly bit is that the world agreed to use the same methods for invloute gears back in WW2 (or was it WW1) but the insistance to quote TPI just makes it harder for you guys.

rodw wrote:

Todd Zuercher wrote: Racks (non metric ones at least) are usually specified in diametrical pitch, This means that a 20 pitch pinion of 1 inch diameter would have 20 teeth and the matching rack would have 20 teeth cover pi inches (about 3.14 inches). So one rev of your 22 tooth pinion should travel 22(pi)/20 inches.

You guys really do it the hard way. In all the other contries in the world (minus one other obscure one) metric makes it so much easier

Take Tommy's module 2, 20 tooth pinon,

The circumference is 2 * 20 = 40mm
The diameter (distance travelled) is 40mm * pi = 125.66mm

The silly bit is that the world agreed to use the same methods for invloute gears back in WW2 (or was it WW1) but the insistance to quote TPI just makes it harder for you guys.

The only difference is inversion, the calculations are almost the same, other than the units difference.

PS: 40mm would be the diameter, 125.66 would be the circumference.

Oops, sorry, I updated what I said. I've been immersed in this stuff with a US based engineer the last couple of days who is working in SI units. This morning he said:

Rod, in your distance traveled calc per pinion rev - my research showed that a 30mm diameter pinion is the pitch diameter. You guys are clever enough to call it by it's useful name

you need the pitch of the belt system

there are Inch and Metric belts available
GT2 for instance is metric 2mm Metric is 5mm or 10mm Standard
the Inch ones are module m=d/z
but better to messure is the outside diameter m=da / 7(z+2)

and d=Workdiameter=m*z
worklengthPerRev= U = d*Pi THATS the Value you need for calculation

if you got the m you got P as m=P / Pi -> P= m * Pi
so you got
d= (z*P) / Pi

Sorry Education Personal