Thread: New Mill losing steps
1 - ON
2 - ON
3 - OFF
4 - OFF
5 - ON
6 - OFF
7 - ON
8 - ON
Output Current(A): 5.7
RMS current: 4.00
micro step: 1600 pulse/rev
Standstill current: half dynamic current
microstep 1600 probably means (360/1.8)x8 = 1600 in which case 1/8 microstep
I think motors are 6A
Last edited by EddyCurrent; 04-11-2014 at 09:44 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
Thank you for your reply.im trying to get more information for you as you've been a great help just a bit unsure where to find the rest.what is a normal feed rate for this type of machine on aluminium
Do you have any screens on the cables to the steppers (I don't see any) or perhaps consider cat5 twisted pairs for the step and dir etc. ..Clive
Last edited by Clive S; 04-11-2014 at 10:34 PM.
However I do know you need to find out how far the X and Y move for one revolution of the driving screw.
Also set the acceleration and velocity to be the same for X and Y so they work better on curves.
Last edited by EddyCurrent; 05-11-2014 at 09:16 AM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
Looking at the photo, your stepper motors appear to be directly coupled to the end of the lead screws and therefore have a 1:1 ratio.
In Mach 3 the calculation for 'steps per' is;
((360 degrees / motor step angle) * microstep value) / screw pitch
So for your machine we don't know the screw pitch and that is what you need to do by turning the screw one rev and measuring the table distance moved.
As an example for my machine the calculation is;
((360/1.8) * 8) / 10 = 160 steps per.
Similar to what jazzcnc said but using 1/8 microstep it looks like your machine has a screw pitch of 2.0176mm which sounds a bit odd.
Last edited by EddyCurrent; 05-11-2014 at 06:00 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
Eddy's correct and to do the maths we need the screw pitch. . .BUT . . . There is another way to do this if you don't know. (thou in your case it's not hard to find out)
In Mach on the settings Tab there is an option to "Set steps per Unit" it's just above the reset button.
To do this you will need to accurately measure how far the machine moves. (Tape measure isn't accurate enough)
when you click the button it will ask which Axis to calibrate then after this it will ask how far to move. Enter an amount, soon as you click enter the machine will move in a positive direction. Mach will then ask how far it moved, so measure distance and enter into box then it will calculate the STEPS PER for you.
Do this for each axis and you'll be set. The longer the distance you can measure and the more accurate the better.
Last edited by JAZZCNC; 05-11-2014 at 07:17 PM.
hi guys getting an error saying ( cant have a move of zero) this comes up when i go to type in the distance i want the machine to move
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