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  1. #1

    Question Z Axis Touch Plate Recommendations

    I'm looking for recommendations for an inexpensive touch plate for setting the Z axis on my DIY CNC router.

    In my searches I see a lot of hockey puck and plate style devices that don't seem to have any compliance or over travel capability. This can't be good.

    I see some brass button styles starting at ~25$. Most of the comments say they have to be reworked due to poor continuity.

    What would you recommend?

  2. #2
    Neuer Benutzer
    Join Date
    Jan 2013
    Posts
    187

    Re: Z Axis Touch Plate Recommendations

    I use a switch that is repeatable to 3 microns. this one

    I purchased it on eBay for around $20 it moves about 1/8" before it triggers, then has 1/4" of travel after the trigger point.

    In use, I rapid down to the switch, when it triggers I retract 1/4" then move down at 5 ipm, retract 1/4" then move down at 5 ipm again and take the average of the Z position both times. I exported the output the an excel spread sheet after doing it 100 times. I found the accuracy was repeatable within +-2 microns, and about 75% of the time it was the exact same value.

    I like this method because I have an ATC and I can set depth as part of the change cycle, and don't have to worry about additional wires etc, to complete a circuit.

  3. #3
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    Nov 2011
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    204

    Re: Z Axis Touch Plate Recommendations

    Could you reveal the brand, supplier or Ebay seller of the product?

    Don

  4. #4
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    Join Date
    May 2004
    Posts
    134

    Re: Z Axis Touch Plate Recommendations

    I don't think the one linked to is the one he bought for $20 on ebay... At least, not based on the listed price.

  5. #5
    Neuer Benutzer
    Join Date
    Jan 2013
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    187

    Re: Z Axis Touch Plate Recommendations

    The one I linked to is the one I use. The seller only had one, it was a lucky purchase. When I was researching doing this, I saw other using a hall effect sensor, but the issue with them is that the amount of metal at the end of the cutter could affect depth.

    If you do a little googling you can find mechanical limit switches that are position repeatable. I believe most of them are just hall effect sensors in a nice package, where the mechanical switch trips the hall effect.

    The biggest problem I have with mine is that once in a while a chip will land on it and goof up the depth, I plan to add blow off, but need more time!

  6. #6
    Registered
    Join Date
    May 2004
    Posts
    134

    Re: Z Axis Touch Plate Recommendations

    Quote Originally Posted by TTalma View Post
    The one I linked to is the one I use. The seller only had one, it was a lucky purchase. When I was researching doing this, I saw other using a hall effect sensor, but the issue with them is that the amount of metal at the end of the cutter could affect depth.

    If you do a little googling you can find mechanical limit switches that are position repeatable. I believe most of them are just hall effect sensors in a nice package, where the mechanical switch trips the hall effect.

    The biggest problem I have with mine is that once in a while a chip will land on it and goof up the depth, I plan to add blow off, but need more time!
    Fantastic score. You should buy some lottery tickets...

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