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Too big to fail
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Broken drill press - fixable?
Is this fixable? The chuck came right off the spindle tonight.
 
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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03-29-2006, 08:24 PM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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Thom,
How was it affixed before? Usually a bolt or screw on arrangement. If you look inside the chuck or the arbor what is there attaching the two? Hope its more than just a press fit? Joe
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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03-29-2006, 08:32 PM
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What brand? That looks like a morse taper jam spindle. My dad has an ancient Delta that is held in place by friction only. All I have to do to get the chuck off of my dad's is hit the top of the chuck... It falls right off. It too, has actually fallen off on me while drilling. Take the bit out, shove it back on the spindle and give a few light taps from a mallet from the bottom.
Dave
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs. '84 Targa - Arena Red - AX #104 '07 Toyota Camry Hybrid - Yes, I'm that guy... '01 Toyota Corolla - Urban Camouflage - SOLD Last edited by slodave; 03-29-2006 at 10:20 PM.. |
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03-29-2006, 08:49 PM
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The exact same thing happened to me this past weekend!
Block of wood and a hand sledge did the trick. Harbor Freight has another cheapie one on sale for $39. They are practically disposable. Heck, it's hard to buy a 1/2" chuck for $39....
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03-29-2006, 08:50 PM
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The Jacobs chuck Thom has is great. I would not replace it.
Dave
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs. '84 Targa - Arena Red - AX #104 '07 Toyota Camry Hybrid - Yes, I'm that guy... '01 Toyota Corolla - Urban Camouflage - SOLD |
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03-29-2006, 08:51 PM
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Too big to fail
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So it's just jammed on there, eh? Ok, I'll clean it up and try to mash it back on.
Thanks!
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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03-29-2006, 09:14 PM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
Posts: 10,459
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would it help to knurl the taper?
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03-29-2006, 09:39 PM
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Quote:
Dave
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs. '84 Targa - Arena Red - AX #104 '07 Toyota Camry Hybrid - Yes, I'm that guy... '01 Toyota Corolla - Urban Camouflage - SOLD |
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03-29-2006, 09:45 PM
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Join Date: Apr 2002
Location: NoCal
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Thom,
That sort of thing happens all the time, even on the $10K milling machine I was using yesterday. As others have said, clean up the tapers. A good way to clean the taper on the press itself would be to turn on the motor and hit it with a scotchbrite pad. You want it as smooth as possible. Clean the inside taper of the chuck too. The taper relies on clean metal to metal contact to work. Then install the chuck. I usually give it a few taps with a dead blow hammer, just to be sure. As to why it happened, well that's another topic. Lets just say a drill tries to draw itself into the metal it's cutting. I'd recommend a bit more downward pressure when drilling, to keep the chuck fully engaged with the spindle taper. If the pressure is too light, you'll have the problem you experienced tonight. Jim |
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03-29-2006, 09:51 PM
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Quote:
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03-29-2006, 09:57 PM
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I also agree with Jim, clean the taper and the chuck. The taper seems to be in good shape. I said I use silicon grease earlier.... Actually I use a little lithium grease on the spindle and gentle wipe it off. You don't want any rust to develop between the the two parts. Thom, I think you live somewhat near the ocean??
Dave
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Make sure to check out my balls in the Pelican Parts Catalog! 917 inspired shift knobs. '84 Targa - Arena Red - AX #104 '07 Toyota Camry Hybrid - Yes, I'm that guy... '01 Toyota Corolla - Urban Camouflage - SOLD |
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03-29-2006, 10:26 PM
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In the shop at Pelican
Join Date: Aug 2002
Location: Los Angeles, CA
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maybe im just not understanding how the chuck actually is held on...
Yep, I retract my statement, knurling would be a bad idea. Didnt realize how it was secured.. |
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03-29-2006, 10:45 PM
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On my new Delta press the instuctions stated that a degreaser dhould be used to clean both the spindle and chuck. I used brake cleaner, and I have taken it off to inspect for rust (I'm a bit anal about things like this) and it looked perfect.
-Jeremy
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03-30-2006, 04:16 AM
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Join Date: Jul 2001
Location: I'm right here Tati
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Yep, just clean it up real good with scotch brite and ram her home.
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03-30-2006, 05:00 AM
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Location: St Charles Il
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It's called a "self locking taper". There are several types and sizes of them. A old tool maker trick to make the fit lock up even tighter is to use a dusting of chalk.
A follow up on Jims idea of the drill pulling off. In soft metals where the drill trys to pull in it is a good idea to grind a 0 or slight negative rake at the tip. Then the drill press drives the bit into the material. |
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03-30-2006, 06:00 AM
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Too big to fail
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I was using a 3 3/4" hole saw on 12ga steel, and this press doesn't have the torque needed when the hole saw gets a good bite - it would stall - so I was working it down very slowly.
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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03-30-2006, 06:39 AM
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Too big to fail
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Last night I cleaned everything up with a scotchbrite pad, ran the 'claws' of the chuck up inside so I wouldn't mangle them, then pounded it on with a hammer and it's working fine now - thanks!
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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03-31-2006, 09:39 AM
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1984 Porsche Targa 3.2L
1987 Porsche Carrera 3.2 
