Re: [CAD_CAM_EDM_DRO] Re: Tapered Threads? Kim's TurboCNC codes

On Thu, 2003-10-30 at 04:53, rotarysmp wrote:

> Hi Kim,
>
> Have you talked to Dave K about gettng your G codes encorporated into
> an official release of TurboCNC?

Dave and I have been emailing on a regular basis. I think he is really
busy with V4.

> Those two features you have added
> would be a huge service to the TurboCNC community if you were willing
> to share them.

I'm willing to share, but I wish TCNC was truly open source. I've done
a lot more mods to TCNC than just those, like the ability to run 3
handwheel encoders, etc. I've also added symbols and the ability to do
true single stepping when running a file.

> Does your G76 multipass threading routine infeed along a 29.5° angle,
> or just a direct infeed?

Angle adjusted infeed. Right now it is 29 degrees. I could add an A
parameter so that threads of any thread angle could be properly cut.

> I had been thinking of writing an Excel
> macro to create the lines of code to do multipass threading with
> angled infeed, but it makes much more sense to code it into TurboCNC
> as a canned cycle.

Did you see my post last week where I explained that we added a canned
helical milling cycle as well as a circular cycle ? I also added taper
cuts to G77 and a 3rd axis to a G77 clone for milling, ie G77x where X
is 0,1,2,3 depending on what type of cut you want.

> I need to step up my efforts to learn TurboPascal, as I would like to
> rewrite the encoder sync module to sync on both the rising and
> falling edge of the encoder pulse for double the resolution with the
> same hardware.

The output from most encoders isn't a symmetric pulse ie there is no
guarantee that the duty cycle will be 50%. Even if the sensor gear had
a 50% tooth, the rise and fall times might not be equal, so I wouldn't
program it to use the rising and falling edges. BTW: TCNC needs a pulse
width of about 20 degrees right now.

One could, however, machine (we are machinists, right ?) a gear with
multiple teeth and trigger on the rising edge of each one of them. One
wouldn't even have to modify the program if one remembered to adjust the
thread pitch by the "gear tooth factor".

Why do you need higher spindle resolution ?

> Regards,
> Mark
>
>
>
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--
Kim Lux <lux@...>