Gear cutting with HAL function

I read your links and try to understand but it's not very simple, please tell me if my reasoning is good.

I checked my input pin in watch screen , it's works.

so now I must copy paste your code :
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Hobbing

in the custom_postgui.hal file and that's it ?

in your code, I'm not sure because I don't understand very well all the code and functions but I suppose A axis can not be use directly with // port with this code :
# A-Axis
setp hm2_7i43.0.stepgen.03.step_type 0
setp hm2_7i43.0.stepgen.03.position-scale [AXIS_3]SCALE
setp hm2_7i43.0.stepgen.03.steplen [AXIS_3]STEPLEN
setp hm2_7i43.0.stepgen.03.stepspace [AXIS_3]STEPSPACE
setp hm2_7i43.0.stepgen.03.dirhold [AXIS_3]DIRHOLD
setp hm2_7i43.0.stepgen.03.dirsetup [AXIS_3]DIRSETUP
setp hm2_7i43.0.stepgen.03.maxaccel [AXIS_3]STEPGEN_MAXACCEL
setp hm2_7i43.0.encoder.00.scale -200

hello andy, I would like propose in the french categorie, a tutorial with screenshots for help people to use this hal function.

So I launch stefconf and configure A axis, and enable the hal function.

For the port // setup , I must choose In input pin (mill to pc) : numerical input ?

after that, what I need to enable for the hal ?



thk

In this case, how can I do it manually ? I think I can know after with the stefconf what is the good configuration.

There are several week that I'm not come on this thread for learn more about hal function because I not enough time, but I really want understand and use this hal function for make my personnal hobbing, it's shame that there is not exist a tutorial for learn more quickly.

I check an other way for make similar function (not with hal function for the moment), but directly in hardware with an arduino card.

I can use an arduino card for change speed ratio between an encoder and stepper motor. It can be more simple that hal function.

But I don't know exactly how I must calculate the good speed ratio between the encoder, stepper motor and gear cutting mill like this :



I suppose it is the same thing that with hal function because it's mathematical.

in my idea, if the gear diameter is the same that the gear cutting mill, the speed ratio is 1:1, after just dividing or multiplying according to the diameter between the gear cutting mill and the gear.
But I'm not sure, it looks too simple.

Somebody can help me ?

andypugh wrote:

I think that sounds like a difficult way to do it.

Really, the way I did it was very simple.

I already make the C code, this is the same thing, I can change easly the speed ratio between encoder and the step of the stepper motor
if it's works for gear hobbing, it can be very simple to use.

Set up your machine t work correctly with stepconf, then post the entire config directory as a zip file here, I will edit it to make it work for hobbing.

when I have more time, I try to install all this and I send you the zip file

just, I seen that you have create a new spindle encoder disc with 180 tooth, why ?