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Old 06-29-2018, 10:35 PM
Jim_in_PA Jim_in_PA is offline
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Default Collet Question

I have and use various sizes of ER25 collets; both those that came with my Stinger II and some more I bought for both backup and to allow me to stay ahead of tool changes. In general, they take the cutters with enough snugness that I don't have to worry about the bit falling out of them while I'm tightening the nut on the Spindle...with the exception of the 1/2" collet. That size doesn't grab any of my 1/2" shank cutters enough to hold it while doing the deed. I've tested probably a dozen 1/2" shank bits, both CNC oriented and just for grins, a bunch from my regular router bit collection from various manufacturers. This includes both 1/2" collets I have; the one that came with my Stinger II and an Amana I recently purchased as backup and for convenience as already mentioned.

Is this just a normal thing for 1/2" collets? 1/8" is snug. 1/4" is snug. 3/8" is snug. I don't know about the 3/16" one because I don't have anything with that shank size yet. Bizarre that I need a third hand with 1/2" shank bits. LOL
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Old 06-29-2018, 10:38 PM
Rlee1972 Rlee1972 is offline
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I would replace RAPIDLY without using. We run a lot of 1/2” and it’s very tight just by hand tightening. Of course we use the wrench to complete but we see no difference in that regard from our 1/16” up to 5/8” collets. All tight!
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Old 06-30-2018, 02:03 AM
Ger21 Ger21 is offline
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It could be a 13mm collet?


I've been using ER32 collets for 20 years, and I have a lot that are not tight until you start to tighten the nut.

As long as it starts to grab with light finger tightening, the collet is fine.
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Old 06-30-2018, 09:34 AM
Jim_in_PA Jim_in_PA is offline
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Here's the thing...it's two different 1/2" collets from two different manufacturers. One is the collet that came with the machine; the other is an Amana that I bought this week. IE, brand new. That's why I'm puzzled. They both tighten down just fine and securely. It's just when the bit is initially being inserted that the fit of the shank is loose.
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Old 06-30-2018, 09:40 AM
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Gary Campbell Gary Campbell is offline
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Jim...
My collets are similar to Gerry's. About a third will actually hold the bit against gravity, two thirds wont. In all sizes.

Something to think about: 1/2" bits are the heaviest
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Old 06-30-2018, 11:13 AM
drummerjg drummerjg is offline
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For what its worth, the 1/2" ER25 collet that came with my Stinger holds the bit just fine while finger tightening.There isn't any film of oil or lubricant on the bit or collet, is there? Just a wag......or maybe the shank of the bit is undersized???
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Old 06-30-2018, 01:08 PM
Rlee1972 Rlee1972 is offline
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Jim-I misunderstood your statement. I assumed you meant "still loose" after snugging up. Should have read closer.
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  #8  
Old 06-30-2018, 01:28 PM
Jim_in_PA Jim_in_PA is offline
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Quote:
Originally Posted by Gary Campbell View Post
Jim...
My collets are similar to Gerry's. About a third will actually hold the bit against gravity, two thirds wont. In all sizes.

Something to think about: 1/2" bits are the heaviest
I guess I'm just confused that all the other sizes I own (2 of each size at this point) are pretty much spot-on in to hold the cutters via friction, but the 1/2" is loose. Yea, they are heavier cutters, but there's zero resistance. It's just curious!
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  #9  
Old 06-30-2018, 01:59 PM
Bruce Page Bruce Page is offline
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Everything manufactured has a design tolerance. I just measured several 1/2” shanks and they went from .4990 to .5003. Some of them are snug in the collet and some aren’t. I also have a full set of R8 & 5C collets for my mill & lathe, all of them are loose until tightened. Nature of the beast.
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  #10  
Old 06-30-2018, 02:17 PM
Jim_in_PA Jim_in_PA is offline
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Thanks for the confirmation, Bruce and Gary. Much appreciated!
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Non CNC stuff...

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Festool "a good collection"
Stubby - lathe
Oneida Cyclone
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Commission work for equestrian tack storage and other custom furniture and cabinetry
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http://bvww.us
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