Messages

1

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 08, 2020, 11:19:02 AM »

Craig,

Lets see if I have this right. I was hung up on the encoder and trying to factor the 4 into the equation.  Apparently the items factored into the calculation are:  Motor Steps / rev (200), Microstepping (16), and distance moved per step or rev.

My calculation: 200 X 16 = 3200 Steps per revolution.  (Belt 3mm pitch, pulley 24 tooth) 

(3200) / (24 X 3) = 44.444 pulses per mm      Is this correct??

You mentioned previously that 8 is the preferred microstepping factor.  Is there a reason to not use 16?

Thank you much for your help, it is much appreciated,

Roger

2

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 07, 2020, 06:37:59 PM »

Hi Craig,

I have belt drive for "X" and "Y" with 24 tooth pulley. Microstepping can be either 1/8 or 1/16.  Native units is mm.

"Z" axis is screw with 2mm pitch direct drive from stepper.

Please explain CPR and Mach3 steps per motor revolution.

Thanks,

Roger

3

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 07, 2020, 02:02:53 PM »

I am a bit confused with the calculation and use of: Micro stepping, Steps per unit, steps per revolution, cycles per revolution, Mach 3 steps per unit, as they should be calculated for my particular unit.

4

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 07, 2020, 01:52:54 PM »

How do I determine max speed and acceleration?

5

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 07, 2020, 12:24:54 PM »

In the interest of full disclosure, I am new at this.  I just finished building this CNC Router and have installed and wired the controller (TB6560T4V1) with a Parallel interface and this controls 4 ea. NEMA 23 steppers (X, Y, Z, and A axis) A being slaved together with the Y axis.  On the Controller board I have the Microstepping (working mode 1/8, dip 3&4 on) Current decay (Slow decay, dip 1&2 off)  Current setting dip T1&2 are off for 100%*2.5A.  That's it for the hardware setup.  Not sure I understand these settings, but if they are incorrect please let me know.  The stepper motors have 24 tooth 3M pulleys operating on a timing belt, for the X & Y axis movement.

Initial setup for Mach 3:  Native Units mm.  Port#1 enabled. Motor outputs X, Y, Z, A enabled.  Step Port and Dir Port all set to 1.  Y axis Dir Low Active green check. Step pin# 2, 4, 6, 8.  Dir Pin # 3, 5, 7, 9.  Input Signals X+- enabled pin 10 both,  Y+- enabled Pin 11,  Z+- enabled pin 12,  EStop enabled pin 13.  Output Signals, Enable1 pin 1 Output #1 pin 14.

Unless there are other parameters to set up, it is on to motor tuning, on which I am a bit confused.  Some help here would be appreciated.

Roger

6

General Mach Discussion / Re: Stepper motor speed varriations

« on: March 06, 2020, 06:03:00 PM »

My apologies for the delay. 

It seems to do the same thing in either mode.

7

General Mach Discussion / Stepper motor speed varriations

« on: March 04, 2020, 01:00:37 PM »

My stepper motors on the X and Y axis make different sounds and change speeds as I manually move them by using the keyboard.  What might be causing this?  It is a new setup, so I may have some parameters wrong.

Roger