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17th Jul 2018, 10:47 AM #1
Ok I give up - how to get this little key off the shaft?
The photo shows the collet sleeve off an old D-bit grinder. In it is a key 4mm x 9mm. I've had the unit in the freezer for over a week to try and slightly slacken the fit, but it is still stuck fast.
You'll see I've now damaged the key a bit by trying to punch it off by the end, and trying to vise-grip it off by the sides. The key will go in the bin once it's off, I'll have to make a new one.
But how to get it out anyway? I'm now just thinking of carefully filing the key down so I can at least get the sleeve out of the cross-head, then maybe drill and tap what's left of the key to try and pop it out with a screw, or alternatively die-grind the remainder out of the slot.
Surely though there's a more elegant solution, if I haven't already cashed in my chips by rounding off the projecting edges of the key?
Deckel S0 collet sleeve - lr.jpg
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17th Jul 2018, 10:56 AM #2Most Valued Member
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You might have more luck using a diamond point cold chisel but use it on the broad side of the key rather than the end. Just a light tap alternating sides between each tap.
I have had good success this way.
Phil
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17th Jul 2018, 11:05 AM #3Most Valued Member
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i would freehand drill and tap it, use a slide hammer with said thread on the end, i usually just gary (bodge) the slide hammer up from whatever is around. coffee mug, lollipop stick etc.
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17th Jul 2018, 11:11 AM #4
Thanks Phil, I would need to buy one. Not cheap though - oddly Blackwoods seems to be cheaper than eBay on this occasion - but still $43 for a 6"x1/2"x1/4" (https://www.blackwoods.com.au/part/0...-point-6x12x14) - is that what you were thinking of?
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17th Jul 2018, 11:42 AM #5Most Valued Member
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Grab the end of it with your sidecutters flat against the shaft then squeeze and pivot the handles up.
shed
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17th Jul 2018, 11:54 AM #6
Just got to let it cool off back to cold again - I put it in the oven on low heat because after being in the freezer water was condensing all over it. It's quite warm in this wintry Canberra shed though - 10.6 degrees - whew - might take an hour or so.
Then I'll try the side-cutters first, it's clearly the easiest, then maybe the drill and tap, and if all else fails then head off to the other side of town and get a diamond point chisel.
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17th Jul 2018, 12:06 PM #7
Phil wins. I couldn't find the side-cutters, so I just tried an ordinary steel cold chisel, some tiny thing 6" long from I had somewhere. A few taps on either side with a light hammer and it was out.
I hadn't even let it cool down. NOW I KNOW!!!
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17th Jul 2018, 12:17 PM #8Member: Blue and white apron brigade
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17th Jul 2018, 05:08 PM #9Most Valued Member
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17th Jul 2018, 06:19 PM #10Senior Member
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Another good trick is to grab the key in a small grinding vice if you have one.
Cheers
Piers
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17th Jul 2018, 08:28 PM #11
A pair of pincers works as well !
Best Regards:
Baron J.
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17th Jul 2018, 09:37 PM #12Senior Member
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Sometimes you can put the shaft on a block of hardwood and tap one end of the key INwards. That pivots the other end out.
Hardwood - so you do not mark the steel shaft, but you support it.
Tap - a calibrated hit with an engineer's ball peen hammer. Start gently.
Cheers
Roger
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18th Jul 2018, 12:43 AM #13
I doubt that the trip to the freezer would help, as that would shrink the spindle and key at similar rates. Doubt that heating would help much either as the spindle is way more massive than the key and in very intimate contact with it. Heat applied to the spindle would expand it, and the key slot, but conduction to the key would cause a similar expansion there in the time it took to get the heat into the spindle due to shear mass of the spindle. Plus there is the chance of distorting the spindle due to uneven heating, or altering material properties dependent upon the heat treatment that the factory would have used in manufacturing the spindle.
I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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18th Jul 2018, 07:05 AM #14Senior Member
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Good it's out.
As for the heat/cool stuff the way to do it would be to warm the shaft with a heat gun until hot to the touch and then touched a frozen steel bar on just the key to shrink it. Only thing better would be to cool the bar with dry ice or liquid nitrogen that we all have around.
Pete
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27th Jul 2018, 06:29 PM #15New Member
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