Topics

1

General Mach Discussion / Mach3 limited step pulse frequency problem

« on: October 29, 2018, 07:02:35 AM »

I am using Mach3 on Windows 7. The hardware is A4988 (stepper driver) and a small stepper motor taken from photocopier. I am using 12VDC and printer port.

The Motor Turning setup is:

Steps per unit >5080
Velocity > 6
Acceleration > 0.6
Step pulse (1-5 us) > 0

This setting works fine. But whenever I try to increase Velocity e.g. 10 or 15 or 20. The motor turns with only Velocity (6). I mean that I increase the velocity in Motor Turning Setup, but in practice it does not increase and it remain 6. I also tried to increase Step pulse (1-5 us) e.g. 1, 3, 5. But the velocity does not increase more than 6.

I also used 555 timer based step pulse generator in place of Mach3. When using 555 timer based step pulse generator, the motor turns with more than 6 Velocity and the motor run faster.

I could not figure out the problem. Using Mach3, the velocity should increase. Is there any problem with Mach3, printer port or computer itself?

2

General Mach Discussion / Need CNC beginning guide

« on: November 19, 2016, 01:58:32 PM »

I am building wood CNC router but it is not finished yet.

Suppose, I have finished it, tested all stepper motors, limit & home switches with Mach3.

Then, need to start working in real time. But there, needs guidance to start making drawing of one line or a big design in CAD program TO real-time engraving.

Please suggest me the basic tutorials or articles or book to get started.

I want to think about the things to do before when my CNC machine will be completed.

3

General Mach Discussion / Can not increase motor velocity (65mm/min). Why?

« on: October 10, 2016, 06:29:34 AM »

I am using 10mm lead with 1.50mm pitch, 200-steps per revolution and so 1.50mm per revolution. I tested the velocity, it can not be increased more than 65mm/min. If I increase, the motor stops after a JERK, and the motor power supply turns off automatically (thanks God, if it would not then it may harm).

The motor tuning setting is attached to show how I set the parameters.

Note:
Using full-step mode
Kernal speed = 35000Hz
Using computer ATX power supply.
Driving stepper with 5V
Using L297 & L298 driver.

4

General Mach Discussion / Mach3 sending pulses to wrong LPT pins

« on: October 09, 2016, 03:29:49 AM »

I have built CNC router, just testing to move X-axis to calculate mm/full cycle.

I set X-axis port setting and "Step per" to 1 as shown in images below, so it will move one step per unit.

I run "G0 X200" to move motor one full cycle. (because most motors have 200 full steps per cycle)

I monitor the LPT port with another program.

After running this code "G0 X200", I thought it should send 200 pulses to D0 - Step pin (second LPT pin) as I set in Port Setting.

LPT monitor shows, Mach3 is sending pulses to D4 & D5 (6th & 7th pin)

Why Mach3 sending pulses to D4 & D5 (6th & 7th pin), expect it should send pulses to D0 (2nd pin)?

Please help, I'm newbie here with Mach3.

5

General Mach Discussion / Unipolar stepper motor with ULN2003?

« on: July 08, 2010, 06:59:06 AM »

hi

Last time I was designing like this . I attack this to computer before start computer. After start I write codes and run only 3 steps. I find that IC and motor are going very much hot, then I disconnect all connections to IC. It really was near to be burnt, if I do not disconnect. What was the problem in circuit? I think it may be in its ground or +12V wire. Is it?