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wrong axis movements
« on: November 05, 2014, 01:00:34 PM »
Hi, my name is ALI
AND I have a problem,
first i had done every thing right and it seems okay ;D
 >:( >:( >:(  my problem is when i tell the (X) axis to go 1 mm! the axis goes 6.99=7mm
and all the axis act like that with different measures
this is my machine specs:
leadshine driver 4.2 AMPS
3 NEMA 23 (IN MY CASE I HAVE 3 AXIS MACHINE)

this is my mach3 configurations:
(x) motor tuning =103.427896 steps
acceleration=  31.607143
velocity =323.58

(Y) steps = 114.6788991
velocity=1455
acceleration=90

(Z) steps =114.9425287
V=1575
ACCELERATION=206.25
my taple workable =520*500*20
  and my other problem is how i can start my PCB coz am using the machine for PCBs prototype  how to start from the center of the taple  ???
please i tried  2 weeks and  couldn't solve it    !1
Re: wrong axis movements
« Reply #1 on: November 05, 2014, 01:08:38 PM »
also this is my drivers config.  for the x.y.z axis
5 micro steps
and 2.89 amps
wrong axis movements
« Reply #2 on: November 05, 2014, 03:46:44 PM »
And your leadscrew pitch is?


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Offline Tweakie.CNC

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Re: wrong axis movements
« Reply #3 on: November 06, 2014, 03:56:51 AM »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: wrong axis movements
« Reply #4 on: November 06, 2014, 05:20:31 AM »
And your leadscrew pitch is?


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am not prof at this stuff but as i know this how i measured every thing about ma ball screw:
am using ballscrew cpz my machine hase a brake for the screw
and sickness of the screw(pitch diameter)  =15.84mm
and the lead =1.23mm
and the pitch=2.42mm
and if i sited the measuring to for 1inch to count how many leads per inches=9 leads i between nd plus the two lead the my tool on it with the two sides
Re: wrong axis movements
« Reply #5 on: November 06, 2014, 05:24:14 AM »
See reply to your post here http://openbuilds.com/threads/i-cannot-get-my-axis-move-right-in-mach3.833/

Tweakie.
i used mach to calculate that by using calculate steps per unit for each axis and it comes up with
103.427896  for (X)
114.6788991 for (Y)
114.9425287 for (Z)
and hen i get mach to move x to 1mm it goes 6.99=7mm!!

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Re: wrong axis movements
« Reply #6 on: November 07, 2014, 03:21:04 AM »
Hi,

first of all you have to be clear in witch unit you what to work,
because sometimes you are talking in mm and sometimes in inches.

let's say we want to work in mm.

figure out what your leadscrew pitch is (for example 15mm per rotation)
figure out the stepangle of your motors (for example 1,8° menas 200 Steps per rotation)
figure out in witch stepping mode your stepper controller is set up (for example 1/2 step mode)

in our example we have 1/2 setp mode and 200 Steps/rot. means we need 400Steps per 15mm.
-> 26.66666666 Steps/mm will per your setup in motortuning

for the speed you can start with 400rev/min what means
-> 6000 mm/min is your speed for motortuning

for acceleration let's start with 600 (1/10 of speed)

if your machine is running now in the correct measurement
you can pay with speed and acceleration.

all these values are based on my example above.

Thomas



anything is possible, just try it.
if you find some mistakes, in my bad bavarian english,they are yours.
Re: wrong axis movements
« Reply #7 on: November 07, 2014, 03:36:05 AM »
First and foremost: do NOT mix units! That way lies ... madness.

Cheers
Roger
Re: wrong axis movements
« Reply #8 on: November 08, 2014, 01:00:54 PM »
First and foremost: do NOT mix units! That way lies ... madness.

There are always those that given an inch will take a kilometer ;-)
Re: wrong axis movements
« Reply #9 on: November 20, 2014, 03:57:42 PM »
hello
i have a question and i can't find the answer for it
i have a LS(LG)  VFD Korean one     it's 1.5KW 2HP
AND the spindle unfortunately 2.2KW  3HP   so all i am asking can i run the spindle according to the VFD max output i mean could i use the VFD to run the spindle with the specs of the 1.5KW spindle coz i don't not neeed all the 3 horse power inust want to rin the spindle like it's 1.5 KW ones?
is it possible ?