Messages

1

General Mach Discussion / Re: need help step per unit

« on: May 08, 2009, 06:39:04 PM »

I'm building cnc router for woodworking and I did try to use timing pulley but it is not available in my town I'm form Egypt so if it important I may make an order  by any on line store. sorry for my poor writing

2

General Mach Discussion / Re: need help step per unit

« on: May 08, 2009, 06:18:44 PM »

I've attach a picture of the pulley I'm using hope that can be help
thank you

3

General Mach Discussion / Re: need help step per unit

« on: May 08, 2009, 05:53:35 PM »

motor revs per unit= 2.5xNs/Nm=2.5x1 =2.5    (1:1 drive ratio because my gear has no teeth)
             Assuming 1:1..........Don't understand "Toothless Gear"..in mach 3 guide says (if the motor has a gear ,chain or belt drive to the screw with Nm teeth on the motor gear and Ns teeth on the screw gear then motor revs per unit = screw revs per unit xNs/Nm).my motor has gear with belt drive to the screw the gear is flat with no teeth so how can I calculate Nm and Ns.shall I ignore Nm and Ns in my calculation or there is anther way to calculated.
thank your for kind support

4

General Mach Discussion / Re: need help step per unit

« on: May 08, 2009, 12:16:52 PM »

hi Tweakie
thank you for your interest  and my machine  set up  in mm .

5

General Mach Discussion / need help step per unit

« on: May 05, 2009, 12:53:01 PM »

I've read tuning motor chapter,and make my calculation as below
pitch=1/5 =0.2                effective pitch =0.2x2=0.4
screw revs per unit =1/0.4 =2.5
motor revs per unit= 2.5xNs/Nm=2.5x1 =2.5    (1:1 drive ratio because my gear has no teeth)
mach3 steps per motor revs =200x32 = 6400
mach3 step per unit = 6400x2.5 =16000
would you please check this calculation if it right and if drive ratio 1:1 is right or not.
thank you for your support

6

Forum suggestions and report forum problems. / need advice for my step per unit

« on: May 05, 2009, 11:20:04 AM »

I've read tuning motor chapter,and make my calculation as below
pitch=1/5 =0.2                effective pitch =0.2x2=0.4
screw revs per unit =1/0.4 =2.5
motor revs per unit= 2.5xNs/Nm=2.5x1 =2.5    (1:1 drive ratio  my gear has no teeth)
mach3 steps per motor revs =200x32 = 6400
mach3 step per unit = 6400x2.5 =16000
would you please check this calculation if it right and if drive ratio 1:1 is right.
thank you for your support

7

General Mach Discussion / Re: wrong parts measurment

« on: May 04, 2009, 06:55:14 PM »

thank for reply,I've read tuning motor chapter,and make my calculation as below
pitch=1/5 =0.2                effective pitch =0.2x2=0.4
screw revs per unit =1/0.4 =2.5
motor revs per unit= 2.5xNs/Nm=2.5x1 =2.5    (1:1 drive ratio because my gear has no teeth)
mach3 steps per motor revs =200x32 = 6400
mach3 step per unit = 6400x2.5 =16000
would you please check this calculation if it right and if drive ratio 1:1 is right.
thank you for your support

8

General Mach Discussion / wrong parts measurment

« on: May 04, 2009, 12:32:11 PM »

I'm trying to test my machine and I always get wrong measurement say I'm draw an rectangle with size 150x130 mm it give completely wrong measurement like 100x90 mm.I'm not sure if step per unit is correct or what.can some one help me to find out my step per unit please the following are my machine  details
34 Nema stepper motor 1.8
1/32 microstepping drive
leadscrew Dia 25mm,with 5 thread per inch and 5mm between threadcrests and is connected to the motor with pulley which has no teeth in the motor shaft and  pulley which has no teeth  in the screw( there no  teeth in the screw gear and no teeth in the motor gear Ns,Nm)

9

General Mach Discussion / power went off

« on: February 16, 2009, 12:21:40 PM »

I'm new to cnc and please ,need some help as I was in the middle of cutting and suddenly power went off and when i restart my computer I don't know  how to start my G code and which line should I start to finish cutting.
thank you for your help