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18th Jul 2021, 12:54 AM #1Diamond Member
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Removing arbor from old drill chuck
I have an old Jacobs chuck that isn't worth fixing, and wanted to get the MT3->JT arbor out of it. But of course it wouldn't budge.
My first thought was a gas torch on the chuck.
Before I could get to the torch, neighbour suggested a car suspension puller fork between the bottom of the chuck and the edge of the MT3.
Then toolmaker recommended just parting it off in the lathe. My parting tool isn't that good, so turning the back of the chuck down was next best idea. While it did take some time to do, it was a pleasant task:
IMG_1733.jpg
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18th Jul 2021, 02:11 AM #2
Hi Nigel, Guys,
The normal way that the JT arbour is removed is to open the chuck jaws and drill a hole in the back of the chuck and knock the arbour out with a punch. When drilling the back of the chuck, you will know when you are through when the drill breaks into the cavity under the arbour.
Much easier !Best Regards:
Baron J.
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18th Jul 2021, 08:06 AM #3Philomath in training
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I agree with John on that and had to do the same thing a few weeks ago. I recorded what I was doing so will be releasing a video on it around the 30th, after I've finished up doing the Waldown pulley upgrade.
Michael
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18th Jul 2021, 12:02 PM #4Diamond Member
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18th Jul 2021, 05:01 PM #5
Hi Nigel,
I think you are missing the point, you already had the chuck in the lathe spindle, a 1/4" drill in the tailstock, drill a hole in the back of the drill chuck, remove and then sit the chuck arbour down on top of your vise jaws and using a punch through the hole give the arbour a smack with a hammer. It will pop out easily. At this point you will have both a good JT arbour and a repairable chuck if you wanted !
I've done it the other way round as well ! A drill gripped in the lathe three jaw chuck and the errant drill chuck, this one on an MT2, in the tailstock.
Also once you have a hole through the back of a drill chuck it makes it easy to swap things if you need to. For instance, my 16 mm Jacobs won't hold a 2.5 mm drill, but my Rhone 12 mm one will, same arbour taper ! So its easy to swap them as needed.Best Regards:
Baron J.
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25th Jul 2021, 01:09 PM #6Member
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also, a bit of heat will expand it, hopefully will pop off.
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30th Jul 2021, 08:25 AM #7Philomath in training
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- Oct 2011
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- Norwood-ish, Adelaide
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