Video NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE


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Thread: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

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    Default NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Hi Folks.

    I am keen to get your technical feedback on a new Design Touch Probe I have been developing.

    Please note I want to respect the rules of this forum and do not in this posting offer this invention for sale etc. I am interested to receive your technical thoughts and feedback only via this thread.

    Cheers Keen





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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Nice work keen. Not to be pedantic, but wouldn't this be a "crash damage resistant" design, as opposed to "crash resistant". All likeliness of crashing is still there. As seen here

    NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE-pkm2qjl-jpg

    How easy would it be to change out the shaft if its bent? I watched the videos again, but I didn't see if the probe could measure Z.

    Last edited by soymilk; 07-25-2016 at 01:03 AM.


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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Nice - when can I buy one?



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Quote Originally Posted by soymilk View Post
    Nice work keen. Not to be pedantic, but wouldn't this be a "crash damage resistant" design, as opposed to "crash resistant". All likeliness of crashing is still there. As seen here

    NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE-pkm2qjl-jpg

    How easy would it be to change out the shaft if its bent? I watched the videos again, but I didn't see if the probe could measure Z.
    Thanks for your feedback. Maybe Smash Resistant would be more accurate!

    Yes the Probe measures Z just the same.

    It is unlikely the shaft or stem would break - but if it did, I am thinking it best to supply a replacement stylus assembly. It has a simple design and will help keep the overall cost down.

    Cheers.., Keen



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Quote Originally Posted by brianbonedoc View Post
    Nice - when can I buy one?
    Hi Brian. Thanks for the feedback.

    I want to respect the forum rules and not discuss price or supply etc here, this thread is for technical matters.

    You can send me a PM re other matters.

    Cheers Keen



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Does the probe have normally open contacts or normally closed contacts like the Tormach #32309? I ask because several times in the video you mentioned failure due to forgetting to plug in the cable.



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Keen:

    The "secret" to having the internal contacts working for millions of cycles without requiring any maintenance is to have electronics that detects when the contacts are about to open and drop the current to zero. This is how the older Renishaw probes operate (I have purchased multiple Renishaw probes on eBay for very low prices). Having a constant current running through the contacts (without the low voltage sensing) will result in arcing when the contacts open up. If you sense the voltage increase before the contacts open, you can reduce the current to zero before the contacts open and totally prevent arcing. This will also greatly increase the sensitivity of the probe since the stylus deflection is greatly reduced as well. A timeout has to occur before a test constant current gets reapplied, and if the contact is still open drop the current to zero again and wait the timeout again. You can often get Renishaw probe interface boxes on eBay for reasonable prices, although you may prefer making your own electronics (that's what I would do in your situation).



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    I haven't checked which are expired but Renishaw obtained numerous patents covering their ideas including the arc reduction technique that you mentioned, a breakaway stylus, use of strain gauges, piezo sensors, optical sensors, wireless connections, etc, etc. Something to consider if you decide to commercialize the improved touch probe.



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    I really like your style keen. Well done.

    WW



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    I'd certainly be interested in this probe. I use a standard edge finder cause of dealing with expensive probes just hasn't been worth it to me.



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Quote Originally Posted by kstrauss View Post
    Does the probe have normally open contacts or normally closed contacts like the Tormach #32309? I ask because several times in the video you mentioned failure due to forgetting to plug in the cable.
    Hi kstrauss.

    Normally closed.



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    Default Re: NEW DESIGN CRASH RESISTANT LOW COST TOUCH PROBE

    Quote Originally Posted by Dallas J View Post
    I'd certainly be interested in this probe. I use a standard edge finder cause of dealing with expensive probes just hasn't been worth it to me.
    Thanks for your feedback.

    Keen



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