Gear cutting with HAL function

I don't know where you have seen my other encoder, but it is probably the one for the lathe spindle.

Something I just remembered to mention.
In my setup, the scaling between the stepper motor revolutions and the workpiece revolutions is handled in the stepgen scaling. There is actually a belt reduction between the two.

darty367 wrote:

I just find here : picasaweb.google.com/bodgesoc/Gibbs#5437112859354194098

Yes, that's the lathe spindle one.

Sorry for the slow replies, I spent today travelling to Spain.

valvolo wrote:

1) the disk of the encoder must have a specific number of teeth?

No, any number will work. You need to set the scale correcty in the LinuxCNC config files, but it can be any number. More teeth is better as long as the counting hardware/software can keep up.

3) with the hobbing cutting, synchronization between spindle and 'a-axis is always 1 to 1 (one turn of the spindle = one turn of the A-axis)?

No, 1 to 1 gives you one tooth, which isn't very useful. (actually, it doesn't even work). The ratio needs to be exactly the required tooth count.

4) where do I find a Pyvcp panel with a spinbox?

You would need to look in the docs for how to create a PyVCP panel. I didn't see any point duplicating things which are better documented elswhere.
www.linuxcnc.org/docs/html/hal/pyvcp.html

if I modify something in the folders of the program does not start LinuxCNC....

Read the crash report, it will tell you what is wrong.
Better still, start LinuxCNC from the command line (type "linuxcnc" and you will get more information.
My guess would be that you don't have the same hardware as me. This is partly why I didn't put all the files up, as the configuration will depend on your hardware. The sample I put up is for people to understand and duplicate, not to simply add to their configuration. Specifically if your machine does not use a Mesa 7i43 then my sample won't work. A modified version ought to work even with a parallel port though.

valvolo wrote:

so now I am studying to figure out how to convert the commands in your program refer to 7i43 to use them with the parallel port!
I have a bit of difficulty..

www.linuxcnc.org/docs/html/man/man9/encoder.9.html

loadrt encoder
...
addf encoder.0.capture-position servo-thread
addf encoder.0.update-counters base-thread
...
setp encoder.0.position-scale 400
...
net A-phase encoder.0.phase-A parport.0.pin-02-in
net B-phase encoder.0.phase-B parport.0.pin-03-in

(other details I don't have the time for right now)