Cheap and Simple ATC for Chinese Spindle


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Thread: Cheap and Simple ATC for Chinese Spindle

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    Default Cheap and Simple ATC for Chinese Spindle

    Here's a little something I put together for my 80mm chinese spindle. I guess you know the type, 20,000rpm, comes with an ER11 collet on the end.

    Its only as far as proof of concept testing, but it works very well so I thought I'd share.

    The retention system uses the spindle motors own drive to tighten and loosen the locking nut (which will be held in place by a simple locking pin solenoid).

    First I'll get the overview shots out of the way...













    And a few videos:

    Showing the tightening mechanism at work


    and the retention force


    Now the working principals.

    Taper (green), toolholder and stub (bronze), locking balls (yellow), locking nut (red), and locking wedge (light blue) are the ATC parts. The rest is all pretty standard stuff.

    Between the Taper and locking nut is a 2mm pitch thread. The locking nut has two drive (locking) dogs which (with a pin) lock the nuts rotation to the housing but allow it to move up and down the axis. This enables the locking nut to both pull and push the locking wedge up and down the spindles axis. When the locking taper is pushed down, the forces the balls inwards, which presses the tool holder stud upwards due to the contact angle. The tapers on the tool holder stud mean when the locking wedge is removed it will push past the balls easily.

    I can upload CAD files, and give more detail on the manufacture (order of operations is important to reduce runout) if people are interested.

    On a personal note, I reckon this is good enough to put into manufacture and go to hardened steel parts instead of aluminum like I used. However I'm a bit low on time an money so I'm just making it open source instead. Of course if anyone else wants to make one or more for yourself or others, just go for it. And if you think the designs are worthy of a donation PM me for paypal details, it'd be nice to afford more than one tool holder for my ATC setup

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    Last edited by bogan; 10-06-2012 at 02:29 AM.


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    Gold Member Bubba's Avatar
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    This looks fascinating. I for one would like to see the drawings.

    Art
    Country Bubba (Older Than Dirt)


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    bogan

    Don't up load your drawings Here, You should sell them, then you can buy your needed tool holders, there is enough in what you have shown for a good machinist to make the ATC, with what you have already posted

    Mactec54


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    I'd be interested in buying one if the price was right. You have any ball park idea on what you spent?

    How about a group buy?

    My CRP 48 x 48 build [URL=]http://www.cnczone.com/forums/open_source_cnc_machine_designs/144173-crp_4x4.html[/URL]


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    Quote Originally Posted by vtx1029 View Post
    I'd be interested in buying one if the price was right. You have any ball park idea on what you spent?

    How about a group buy?
    Ditto here. Although, my spindle has an ER20 collet.



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    There are a lot of projects on Kickstarter that don't seem like the belong. This wouldn't be one of them.

    You should absolutely try to make a small business out of this idea or sell the idea to someone. CNCRouterParts might be a person to contact.



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    Thanks for the compliments guys, but I have so many other things on the go that I am more equipped to make a proper job of, so I'm happy to let this one go.

    The kickstarter idea is a good one, except NZ'ers can't register. If somebody over in US wants to take it on as a kickstarter or whatever, just budget in a healthy sum to pay me for the design/experience/manufacturing tips I would provide Not that you would need to pay as I'm giving it away freely anyway,. but what goes around comes around right!

    Cost for that one is hard to say, maybe 50 bucks of metal stock, and 50 bucks of bearings and fasteners. But its a proof of concept model, the next ones should be made out of good steel, have the taper ground instead of cut, and be hardened afterwards. The bearing size is the same as spindle grade angular contact which are capable of max rpm (the deep groove I used will only be run to about 8k).

    One thing it isn't so good at is tool release, as there is no mechanism to push the tool holder out. Solvable from the tool changer mechanism though.

    Would make a few changes in design and machining process if I was doing another, but nothing major.

    And with regard to the original chinese spindle, the rotor needed the end machining down to a press fit (mine took 8 ton to press the taper on so I think its pretty tight). The ATC housing needs rods running right to the top to bolt it together, as the standard threads are inaccessible when assembled.

    I would think a final price between 500 and 1000 would cover it? but would depend on economy of scale a lot. Not sure whether the spindle rotor would get pressed on during the process, which might make it difficult to harden the steel properly, or pressed on afterwards, which might cause alignment issues.
    Its all the little things like that which actually makes it a significant distance between the proof of concept above, and a production unit I'd consider good enough quality to sell.

    Sent an enquiry on CNCRouterParts' site. Will look at uploading the design files today, might end up over the size restrictions though, will see.



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    Hmmm, worked better than expected Here ya go, in SW2010 format.

    Attached Files Attached Files


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    This is an amazing project. Thanks for sharing.

    Bill

    Joescnc 4x4 R&P Router, Minimill, Minilathe, CNC Foamcutter, laser cutter, Vectric Aspire. http://makermasters.com, http://themakersguide.com


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    Thanks heaps for making the details available! I'm sure many people here will be very appreciative. I certainly am, even though I'll probably cock it up trying to make it!

    cheers,
    Ian

    It's a state of mind!


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    Quote Originally Posted by aarggh View Post
    Thanks heaps for making the details available! I'm sure many people here will be very appreciative. I certainly am, even though I'll probably cock it up trying to make it!

    cheers,
    Ian
    Cocking it up is just one way of learning. And considering this is the third new spindle I've done, I'm proficient in both



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    This is very cool! I have had plans to make a pneumatic atc for my machine. I'm still getting everything sorted out on my cnc, and I have a few projects to do first. Maybe one day soon I'll have time to make one.



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Cheap and Simple ATC for Chinese Spindle

Cheap and Simple ATC for Chinese Spindle