Rigid Tapping on a PCNC1100

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    Default Rigid Tapping on a PCNC1100

    As should be apparent from my previous posts on the Tormach forum I'm not a fan of T/C Tapping and use thread milling exclusively. Now PathPilot is opening up another option - Rigid Tapping!
    We know that LinuxCNC is capable of this but Tormach hasn't yet provided the necessary hardware and software extensions (the 1100 Mk4 can't be far away but who knows what it will bring ). Anyway, I just couldn't resist, and it turned out to be fairly easy. There are however a couple of issues that I still need to clear up. Here's a short video of my initial proof of concept. Now I've proven to myself that it works I can invest more effort an $ in a more professional approach....



    Step

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    Last edited by TurboStep; 07-14-2015 at 06:28 PM. Reason: Video was cut off!


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    Default Re: Rigid Tapping on a PCNC1100

    Great video Step, I think you're going to spark a lot of interest with this.

    Terry



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    Default Re: Rigid Tapping on a PCNC1100

    Very well done! I'm guessing you were able to read directly off the parallel port from within LCNC?

    I haven't looked at the Tormach control board at all, but any thoughts on passing your new data line through the existing Tormach controller board through to the Mesa card?

    I wasn't sure whether or not the Tormach would have the necessary deceleration / acceleration to do rigid tapping, but it's good to see that you had success! I also know nothing about rigid tapping, so this might not even be an issue.



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    Default Re: Rigid Tapping on a PCNC1100

    awesome!

    Tim
    Tormach 1100-3 mill, Grizzly G0709 lathe, PM935 mill, SolidWorks, HSMWorks.


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    Default Re: Rigid Tapping on a PCNC1100

    I have said this before! Your working knowledge of these machines is awesome.
    I always read and take notes from your posts. Well done!



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    Default Re: Rigid Tapping on a PCNC1100

    Very nice! I can't wait to see more. Thanks for sharing.



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    Default Re: Rigid Tapping on a PCNC1100

    the 5i25/6i25 has 2 ports. I assume tormach is only using the rear one. If you are lucky the firmware in the mesa card has at least 1 encoder counter on the second port. If not - then you would need different firmware. Don't know how easy that would be in the pathpilot setup.

    Did you add a base thread or are you only counting in the servo thread?

    sam



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    Default Re: Rigid Tapping on a PCNC1100

    @wtopace: like with the standard parallel port the Mesa card only provides 17 pins per port for input/output and those on the external connector are already fully used. As sam mentioned, the card does have a second port and I initially intended to use this but for the first prototype I decided to go for the parallel port to reduce the number of unknowns - this is all new-land for me as well!
    @ sam: I added a base thread. From the information I've found the card doesn't appear to allocate the resources to either port (correct me if I'm wrong) so if an encoder has been provided at all by the firmware I'm presuming that it would also be available for the second port.
    My next step is to replace my makeshift encoder and maybe Tormach will have released something comparable by then.
    Step



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    Default Re: Rigid Tapping on a PCNC1100

    Awesome work! Any updates on the new encoder or the modifications to PathPilot required?



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    Default Re: Rigid Tapping on a PCNC1100

    Quote Originally Posted by ltborg View Post
    Awesome work! Any updates on the new encoder or the modifications to PathPilot required?
    Thanks, but there wasn't that much to it. The biggest issue was getting the post to generate suitable code and finding a fix for the strange behaviour (see Youtube comments) which is still there on the latest PP versions, although I haven't tried 1.9.4b yet. If I remember correctly the only changes neede to PP were in the HAL to configure the parallel port and set up the encoder. I basically followed the standard configurations described in the cnclinux pages.

    I've made no further progress for several reasons, including:
    It aint broke... so why fix it!
    I only wanted to try rigid tapping because I didn't have a suitable thread mill for 1/4-20 (I use metric multi form thread mills up to 8mm) but I had an unused 1/4-20 tap lying around "just in case", so I actually don't have much use for rigid tapping.
    And then I don't actually like using taps! I much prefer thread milling because it fits better into my workflow. Thread milling is normally the very last operation and doesn't throw up any strings of metal that might scratch a finished surface.

    Finally, I'm busy with other projects like a physical feed rate override knob (inspired by this thread http://www.cnczone.com/forums/tormac...ml#post1773868). I thought it would be fun, even though I didn't think I needed it. Now that I've tried it I find it really quite cool - a video will appear sometime - when I finally get around to it. I'm now working on a simple controller for a multi-nozzle Fogbuster type system inspired by the Datron spray mist coo!lant system. PathPilot is SOOO much more fun than Mach3 ever was!
    Step



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    Default Re: Rigid Tapping on a PCNC1100

    huh. the rising z was an issue with the new TP. I know it was fixed in linuxcnc - maybe it never got back to pathpilot.

    sam



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    Default Re: Rigid Tapping on a PCNC1100

    Quote Originally Posted by samco View Post
    huh. the rising z was an issue with the new TP. I know it was fixed in linuxcnc - maybe it never got back to pathpilot.

    sam
    Thanks for the feedback. I'll check it out when I've merged into 1.9.4b.
    Step



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Rigid Tapping on a PCNC1100

Rigid Tapping on a PCNC1100