Re: [CAD_CAM_EDM_DRO] need help in motor calibration

Here is a better way to figure it.
Your spur gear is a module 1.5 with 24 teeth. From the gear book that would
have a 36MM PD and a 39MM od.
First convert the metric PD to imperial or 36mm/ 25.4=1.4173 is the pitch
diameter in imperial that time pi =4.45265" per rev of the pinion. Next take
4.45265 and divide by 2000 ( 200 steps X10)=.00226326 per step
Then 1"/.00226326=441.8405309 steps per inch so set your steps per unit to
this value
For mach 2 velocity I would start with 50 and work up as you know you
machine is running properly. That will give you 50 IPM but probaly will end
up wanting 200 to 300 depending if it is a router or a plasma cutter.
For mach2 set acceleration to 10 and work up both the velocity and
acceleration for best performance
set the minimum pulse width to 5 and set the direction precharge to 10 for
the G210
Dan

----- Original Message -----
From: "halmandeel" <halmandeel@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, March 13, 2005 1:19 PM
Subject: [CAD_CAM_EDM_DRO] need help in motor calibration


>
>
>
> I have the following information that I need help in:
>
> Driver: Gecko G210 set to 10 microsteps.
>
> Motors: Stepper motors of www.nanotec.com:
>
> Current per winding: 4.0 Amp (P)
> Holding Torque: 1321 oz/in (933 Ncm)
> Resistance per Winding(Ohm):1.94
> Inductance per Winding (mH): 22
> Rotor Inertia(gcm2):4000
> 1.8 Degrees
>
> mechanical: Gantry xyz rack and pinion direct drive:
> Pinion size (dia) without teeth: 36mm
> pitch: 1.5mm
> Pinion teeth: 24
>
> Q1.can you help me figure out the speed?
>
> I got the help of figuring out the following calculations from
> user:rszemeti @ Geckodrive group
>
> Thank you rszemeti
>
> I have 24 teeth per rev @ 1.5mm per tooth = 36mm of movement per
> rev.
>
> the motors are 200 steps per rev (360/1.8) .. so the movement per
> *whole* step is 36mm/200 0.18mm, I am using 10:1 microstepping so
> 0.18/10 = 0.018mm per rev or 1 / 0.018mm =55.55555(recurring)
> steps per mm = 55.55555 * 25.4 = 1411.111097 per inch
>
> Now...on mach2 config>motor tuning I get to a screen with the
> following title "motor setup velocity/acceleration"
>
> I have numbers to fill in :
>
> Velocity:!
> Acceleration:!
> steps per unit: ( I entered 1411.111097 for inch = 55.555555 * 25.4)
> however its not working
> Minimum pulse width= !
> Direction precharge= !
>
> What I get for the number I have entered (1411.111) is if I am
> calculating a 20" of movement of a single x-axis I get a 50+ actual
> movement
>
> Please help me understand how to work it out and solve the problem.
>
>
>
>
>
>
>
>
>
>
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