Collet won't open :( - Page 2


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  1. #13
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    I suppose I can't use the normal drill chuck style collet thing instead eh? Finally had enough guts to experiment on aluminum and then this happened Might not be able to get another collet until the weekend.



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    Quote Originally Posted by trialanderror View Post
    Good idea, already took it off the spindle. Will have to buy a vise, probably not a good idea to use the one for the T slot. Yah this was a cheapo chinese one, actually came with the machine
    Well, with your experience with the collet holder in your head, I am guessing the vise came from the same source. So, yeah, maybe not a good idea. That said, I put collets and tool holders into Kurt vises quite often when others over-tighten them or get them jammed up some way and I need to get them apart.

    How much extra does buying cheap really cost a person, not only in money, but in time?



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    Gold Member Fastest1's Avatar
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    So you have the collet out but the tool is stuck in the collet? Do you have a socket? or a piece of wood with a hole in it? Set the collet on the wood with the tool in the hole, punch the tool out. I cant imagine how it got stuck that tight. You shouldnt need to tighten it that much.



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    The tool will probably come out of the collet with pliers, the problem is that I cannot open the collet holder. Heres a pic of the thing I can't open. New ER32 R8 M12 COLLET CHUCK CNC MILLING LATHE -US | eBay

    I already got it off the machine.



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    you need to put some pressure on it with the wrench then tap on it



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    My bet is that since it is new and since it is cheap, the nut had a burr on the thread. Once you tightened it up, now the thread is galled because of the burr. There is probably no way to save this tool holder other than brute force. And if brute force won't get it apart, then it is worthless to you. At least you can grind the nut off and save the tool holder and the collet, and then buy a new nut. Once you do get it apart, check the threads. I bet you find that is the problem of causing it to be "locked up". I had this happen many times early in my career when making threaded parts and not deburring the threads properly before test assembling them. I learned to deburr my work.



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    Ok I will do my best to get this fixed, I ordered that other on eBay, may as well be used as a cheap spare. Going to find a higher quality one as well. What is deburring exactly?



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    Sometimes in cutting metals and plastics, extra sharp "knife edges" are extruded by the cutting tool. I don't want to get into the physics behind it right now. Deburring is the process where these "knife edges" are removed. The equivalent in wood working is sanding off splintered edges. This deburring is critical when cutting most thread forms, because the threading operation almost always leaves a burr at the start thread and at the end thread. Sometimes the crests of the threads will have sharp edges also. Deburring can be accomplished several ways: Recutting with cutting tools while in the machine, using abrasives by hand while in the machine, using abrasives by hand out of the machine, or by using special hand held deburring tools in or out of the machine.

    Most of the better machinists have spent hours deburring parts and have learned the better machining methods to reduce burrs on their parts, thus reducing deburring time.



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    Sorry I was thinking of a spindle with an internal ER taper. It did seem too obvious if you already had the collet in your hand that you wouldnt have figured out how to tap it out. Sorry.



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    How did you put the collet in the ER nut? You don't just thread the nut over the collet, there is an eccentric in the nut that you need to snap the collet into. If you didn't and you torqued things down, who knows what might have happened. See the diagrams here: Accessories ER Collet

    bob



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    Quote Originally Posted by rowbare View Post
    How did you put the collet in the ER nut? You don't just thread the nut over the collet, there is an eccentric in the nut that you need to snap the collet into. If you didn't and you torqued things down, who knows what might have happened.
    Been there, did that, first time I used an ER. Swore I was never going to tell anyone, but what the heck

    What happens is the collet splits in to 2 pieces. The broken section will go down in to the eccentric cut out and could stop the nut turning.

    If that's the fault you should be able to tap the broken section back out of the way with a punch once the tool is out.



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    Default Re: Collet won't open :(

    iam haveing a lot of trouble finding a er20 spindle i have the one in the pic any advice

    SALE 500W CNC Air Cooling Spindle



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Collet won't open :(

Collet won't open :(