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  1. #1321
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    Default Re: OmioCNC report

    I want a manual edge finder, just something cheap that's quicker and easier than chucking up a rod and feeler gauges.

    Anyone used one of those LED ones or should I go for one that's like a dial gauge with the hinged prong instead of a plunge?


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  2. #1322
    Registered dharmic's Avatar
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    Default Re: OmioCNC report

    I made a touch probe as well. A little simpler, without the electronics in the probe so I could keep two wires back to the black box. Of course, I have to flip the polarity when I swap between this and tool height plate but it's still pretty handy. Sort of. It'll be a lot handier when I've written some macros to touch off a corner of a workpiece, find the centre of a hole and a couple of other things.

    In the meantime, I find a lot of what I'm doing at the moment is getting an edge aligned with X or Y axis of the machine and you can't beat a little run-out gauge for that. I ended up getting a bigger mag base and I can use the arms that came with it in a collet in the spindle to hold it in place, with a lathe dog on the collet nut pushed up against the bottom of the Z ways to stop the spindle from spinning and throwing the readings off.



  3. #1323
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    Default Re: OmioCNC report

    Quote Originally Posted by RCaffin View Post
    You might be interested in MYOG probe tips as well: see
    MYOG and Repair Touch Probe Styli

    Thanks for that, it was a big inspiration early on. Bit too lazy to chase that rabbit hole further right now with qmark styluses being priced not too bad and easily available, but it's certainly in the back of my mind.


    Quote Originally Posted by Stigoe View Post
    Is this a homemade probe or a commercial probe?

    all home made, not decided if I want to put up the cad and board files for it yet, but I'll be doing a step through of the design within a couple weeks on my YT channel at the very least. Not really anything different from other reneshaw clones aside from using a comparator to allow me to use a conductive contact vertex. Side benefit of the particular comparator also being a push/pull driver so the input doesn't need a separate pull up/down, but I'm not really taking advantage since it all goes through a little multi probe board to get the tool setter, probe, and touch plate all working together.


    For a manual edge finder I like the Little Machine Shop 1/4 shank edge finder well enough. Not sure what you mean by hinged prong, like a dial test indicator or a Haimer 3d taster? A test indicator really isn't meant for that kind of thing, it would be way fiddly to keep adjusted on axis, a regular manual edge finder would be far simpler. Haimer I'm not sure if you could get one small enough for your average benchtop gantry machine, and they're really expensive comparatively.

    I had been thinking about putting a steel plate on the spindle holder for a mag base, just chucking up an arm in a collet sounds a lot simpler.



  4. #1324
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    Default Re: OmioCNC report

    Once you have a PCB that does the logic and power (yah, it's on my project list) the touch probe is a handy dandy little add on. But it's not the be-all and end-all of measuring on your machine, I only mention this because it surprised me. Sure, it replaces my wobbler/edge finder and being able to do a G31 move which stops at deflection is great for touching off a zero. But I still get a tonne of use out of a cheapo dial test indicator when setting things up - the touch probes aren't great at letting you run along an edge and seeing how far it deflects as you go along.



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    Default Re: OmioCNC report

    oh ya, I probably use a test indicator more than anything, so many things that a contact probe just can't touch (heh) I'm really curious to try coord system rotation works out for dealing with alignment issues, but I only have really simple probing routines written right now.

    For doing a rough setting I did find it pretty handy to put a led on your main screen that shows the probe activity status if there isn't an indicator light on the probe body itsself. Really quick to probe a zero just above a fixture pin, move the gantry down the axis you're trying to align to and pivot the work piece until the probe triggers without having to do a full probing routine. When 'close enough' is all you need.



  6. #1326
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    Default Re: OmioCNC report

    Dragged out the touch probe today to do a bit of zero setting, it's really nice for that. Gave it a go getting something square and there it's not great, but it is good for confirming that something's set properly in a fixture before hitting the big GO button

    Got my sub-plates sorted for the 4th axis today. No more stuffing around getting everything aligned, it now takes 3 minutes, four dowels (two for head and two for tail) and eight bolts that I can reach with a cordless driver from "I need the 4A" to chucking up a part in a properly aligned, ready to rock and roll rig. Very pleased.





  7. #1327
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    Default Re: OmioCNC report

    Quote Originally Posted by RCaffin View Post

    Looking at a 'typical' Chinese ER25 set on eBay, the specs say
    Style: ER25
    Hardness: 46-50HRC
    Standard: DIN6499b
    Accuracy: 0.005mm

    The ones I bought did seem to meet the DIN Standard.

    'Do you feel lucky?'

    Cheers
    Roger
    Thanks Roger, your link is not working, but I found something quite decent I think:

    ZJchao ER20 Precision SPRING COLLET set 13 pcs 1mm-13mm CNC MILLING LATHE CHUCK | eBay

    They have a runout tolerance of less then 0.008mm, they don't provide hardness, but honestly I have no clue how hard it matters.

    Kind regards, Robert



  8. #1328
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    Default Re: OmioCNC report

    I now want to square things up on the table.
    The X axis ends up aprox. 1mm to high (or to low, don't remember) compared to the Y axis.

    OmioCNC report-notsquared-jpg

    I was thinking to widen the holes on the side panels and adjust as necessary, also using epoxy under the bolts to hold things in place.

    Good idea, or are there better solutions to this?
    Is this something more people where running into?

    Regards, Robert

    Attached Thumbnails Attached Thumbnails OmioCNC report-notsquared-jpg  


  9. #1329
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    Default OmioCNC report

    Mine was out, the big plate the gantry sides bolt onto isn't flat. Once you've surfaced a spoilboard, or like Dharmic got a flat bed and shimmed it square with the spindle, the uneven ness doesn't matter anyway as your work surface is level relative to the tool. The bed is worse than any other part of the machine, one of my bed panels is almost 1mm higher than the next! The frame isn't flat and level either. Personally I wouldn't bother, and just face mill a nice flat surface to clamp your work down to.

    Also the normal t slot bed bows like a banana when any sort of force pushes down on it, so getting things accurate in Z is like trying to piss in the wind.


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  10. #1330
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    Default Re: OmioCNC report

    Quote Originally Posted by Mmpie View Post
    Mine was out, the big plate the gantry sides bolt onto isn't flat. Once you've surfaced a spoilboard, or like Dharmic got a flat bed and shimmed it square with the spindle, the uneven ness doesn't matter anyway as your work surface is level relative to the tool.
    Thanks Mmpie, maybe I did not make myself clear, I was not speaking about the bed but the angle between X and Y.
    I need to be able to cut square parts and now they are way off.
    I check the levels of the bed, its better then I was afraid off: 0.3525mm.
    I will deal with that later, first I want to be able to cut square parts.

    Regards, Robert



  11. #1331
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    Default OmioCNC report

    Ah I see, I would investigate where the problem is before drilling them out, it might be something that can be shimmed or some such easy fix, opening up the holes I think could leave that joint more susceptible to vibration/wobble.


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