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Tool Talk Discussion Forum

press on chuck troubles??

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tom(ont)

03-15-2004 18:50:29




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I was using my 1/2" drill press today with a fairly large bit(3/4") had a good pilot hole and every time I finished a hole the bit snagged a little than the press on chuck fell off. To put chuck back I tap up with hammer? Is there a propper proceedure and was thinking of giving,er a dose of locktite...got any ideas??tom(ont)




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wdTom

03-16-2004 17:58:16




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
What I have done is to drill a hole in the chuck, where some have a screw to hold them to the spindle. Then drill and tap the spindle and use a small allen/socket head capscrew to hold the chuck on. You can loctite it too. Now the real neat thing to do is to tap the hole in the chuck so whenl you want to take it off your remove the capscrew, insert a larger screw that fits the threads you tapped in the chuck and thne screw it in and it will pull the chuck. Probably a #8 or #10 is big enough to hold a chuck on, and a 1/4" thread will pull most I would think.

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Ray M41

03-16-2004 16:13:32




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
I bought a Delta 8" a few years ago. The chuck has a taper fit. It kept falling off. I finally clamped a drill bit in my vise grip and stood the bit up under the spindle. I turned on the drill and with the spindle turning bored a hole in the tip so I could tap it for a 1/4" allen type set screw. I then bought a chuck with a taper fit and fitted with a set screw. End of problems.



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Bob M

03-16-2004 08:17:56




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
I was given an old Buffalo Forge drill press with the same problem. The taper on the spindle was chewed up pretty good and the chuck was completely trashed.

My solution was to remove the spindle and have a buddy turn down the taper to 0.500 then thread it for ½-20. I then purchased a new ½-20 threaded ½" Cushman chuck and screwed it onto the re-worked spindle. It's been working great for 20+ years now.

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Oklahomatractorrebuilder

03-16-2004 05:26:08




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
We had the same problem with our drill press. We took a angle grinder and roughed up the spindle on the drill press, then used loctite on it and used a hammer to set the chuck then let it dry overnight. We drill holes over 3/4 inch with it all the time and have not had any problem in 3 years now. Use the slowest speed and keep your bits as sharp as you can and use chain bar oil when drilling the holes. Tim

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Vern-MI

03-16-2004 04:35:24




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
That is the typical coupling on a drill chuck for a mill or drill press. It allows the chuck to be changed or replaced. The included angle on both pieces must be the same at less than 13 degrees to get the desired locking action. They must also be clean when assembling.



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Slowpoke

03-16-2004 01:15:51




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
I think you have too much vibration from that big bit. It may not be running true, and maybe the speed is too fast. Half inch presses are not made to use over 1/2" bits in steel. But one way to solve the break thru problem is to clamp the work piece on top of a flat scrap, or even line up two pilot holes and drill part way thru the bottom one. Then you only have the last hole to worry about.



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TimV

03-15-2004 21:03:19




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
Tom: I've got one of the cheapie "China Special" drill presses and had the same problem with mine. I ended up using Loc-Tite and it hasn't fell off since, which has been over a year and several hundred holes. I used the "removable strength" grade because I happened to have some laying around, but I imagine any decent stuff would work.



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RusselAZ

03-15-2004 20:20:34




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 Re: press on chuck troubles?? in reply to tom(ont), 03-15-2004 18:50:29  
locktite is a help but; before using it make sure the spindle and the chuck taper are very clean, use some 400 sandpaper on both of the tapers and then heat the chuck to about 250 degrees and then with a block of wood on the drill table, use the drill press and press it on and hold the pressure till the spindle and chuck temperature have equalized.

the next question is how fast your spindle is turning? A 3/4 bit shouldn't be used at more than 200 rpm, preferably slower if possible. And you don't want the bit to be "to" sharp. Another trick that helps the break through problem is (using your pilot hole) turn the piece over if possible and finish from the "bottom" side.

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tom(ont)

03-16-2004 17:06:17




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 Re: Re: press on chuck troubles?? in reply to RusselAZ, 03-15-2004 20:20:34  
thanks guys.. yes the press is on low and i don't run the belt overly tight as a slip clutch. The taper is rough, think I'll clean taper and chuck up and try the lock-tite heatpress idea..I'm usually found over in the ford-N section but thought I'd better ask the tool experts....tom(ont)



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