Messages

21

Spanish / Re: ayuda, alguien q este roscando con mach3tunr..........

« on: May 11, 2011, 12:02:24 PM »

La version es 3.043.035 que es la última en desarrollo, aunque no he encontrado problemas.

El index debounce lo tengo en 100.

22

General Mach Discussion / Re: Opinions on drives for cnc control conversion?

« on: May 10, 2011, 07:39:12 PM »

I purchased TECO drives from Machmotion.  They have been running continously doing production work without any trouble.

23

Spanish / Re: ayuda, alguien q este roscando con mach3tunr..........

« on: May 05, 2011, 10:37:38 PM »

Un solo slot es suficiente para medir RPM y para index. No necesitas mas. Al slot le calculas el ancho con la formula que hay en el manual. A mi  me funciona perfecto.
 

24

Spanish / Re: ayuda, alguien q este roscando con mach3tunr..........

« on: May 05, 2011, 03:08:00 PM »

Tendría que desbribir con mayor detalle el problema.  Yo rosco a 1500 RPM paso 2mm sin ningun problema.  Inicialmente tuve problemas porque la trayectoria no era repetitiva. El problema estaba relacionado con que estaba utilizando el index pulse de un encoder y no era bien procesado.  Luego instalé un slotted disk con un photosensor y rosca perfectamente.

25

Spanish / Re: ayuda, alguien q este roscando con mach3tunr..........

« on: May 04, 2011, 11:40:03 PM »

Si el paso no es constante puede ser:

1. Aceleracion o desaceleracion del coche al principio o final de la rosca. Aqui interviene la capacidad de aceleracion de la máquina, la distancia a la que arranque la rosca etc.

2. Si el husillo no tiene torque suficiente y se pierde velocidad durante el roscado, esto aumenta el paso.

26

General Mach Discussion / Re: Index pulse in Lathe

« on: April 23, 2011, 04:14:07 PM »

Instead of the encoder tried a slotted disk with a hall effect sensor.  Problem got solved at least to the naked eye.  Problem could have been related to the signal stretching circuitry of the BB board or to the encoder itself, or any other unknown cause, not sure.

Tried V42.033 and worked fine.  Then installed V43.022 (latest lockdown) and unusual jerking in the Z axis started (just in threading movement). Installed back V42.033 and jerking continued.  Installed latest dev. version and all went back to normal.  Cannot explain what happened...........

27

General Mach Discussion / Re: Index pulse in Lathe

« on: April 20, 2011, 08:59:38 PM »

Sorry, I got the wrong driver test photo in my last post.

BTW I am using Windows 7

28

General Mach Discussion / Re: Index pulse in Lathe

« on: April 20, 2011, 07:27:58 PM »

Hi Rich,

I think I can set the spindle speed manually.  By this I guess you mean directly from the VFD without commanding it from Mach.  I will try that.

Ticked Spindle Speed Averaging, same behaviour.

Ticked Spindle speed feedback.  Spindle variation less than 2 RPM, but no improvement in threading.

I have single pulse.  It is the index pulse from a heindenhain encoder, that goes through a break out board (otherwise it would be too fast for mach).

Attached PPS test result

Installed latest Dev version and behaves the same.

Clue:  Tried a 10 sec delay (G4) before each G32 and the offset between threads diminshed. 

Will try manual control of the spindle and see what happens.

Jorge

29

General Mach Discussion / Re: Index pulse in Lathe

« on: April 20, 2011, 05:52:47 PM »

Rich,

Attached  XML.

Jorge

30

General Mach Discussion / Re: Index pulse in Lathe

« on: April 20, 2011, 01:50:03 PM »

Rich,

Here are some results from this morning.

Checked Z axis for backlash with a dial indicator: 0.03mm
Mach backlash compensation is disabled.

Check repeatibility precision of Z axis:  In 6mm its dead zero. Checked arrival point both with G1 and G32 and they behave exactly the same.

Then did a threading test (see attached).  Made three passes and they are off about 0.3 mm from each other.

I am attaching the photos of the test and the code used.

The spindle encoder is a Heindenhain that came with the machine.  The index signal is processed by a Machmotion B B board.  RPM reads well, and even RPM control with feedback is very accurate too.

Still cannot understand what is going on........

Thanks,

Jorge