feedrate with DeskCNC

[peterpan]

Couldn't follow your calculations. Looks like my maths is just as bad. This is the way I do it.

1 inch = 25.4 rev (tpi 25.4)
1 rev = 2000 steps (1/10 microstepping)
so 1 inch 25.4 rev x 2000 steps/rev
1 inch = 50800 steps

50800 steps = 1 inch
so 1 step = 1/50800 inch
1 step = 0.000019685 inch

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Another way to look at it
25.4 rev = 1 inch
1 rev = 1/25.4 inch = 0.03937 inch
1 rev = 2000 steps = 0.03937 inch
so 1 step = 0.03937/2000 inch =0.000019685 inch

[WOODKNACK]

Well there you go! you came out with same end results as I did. Your first quote must have been a typo..
Hi Woodknack,

Looks like we are getting nearer to understanding each other.

My screwthread is metric - 1mm per revolution
That would make it 25.4mm in an inch, therefore 25.4rev per inch

With the Gecko 1/10 microstepping driver, 2000 microsteps per rev. it will take 2000x25.4 steps = 50800 steps to move 1 inch

The resolution (inch per step) = 1/50800 = 0.00001984

Suppose the be, 1/50800=0.000019685

looks like we just went throught it for nothing, I think you just made a typo thats all.

How many IPM can you get in Turbocnc?
Seems like you should be getting more then me?

[Dan Mauch]

Deskwinnc and deskcnc use the same PIC chip as the signal generator. Deskam recommend using a max of 25000 steps per second but as I recall will run up to 44000 steps per second.
So with 50000 steps per in it should run at least at 30 IPM and up to about 45 IPM
Dan

[cncman]

Thanks for the info Dan.