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Help needed for Drill Press issue

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Forum topic by JVallario posted 10-25-2010 09:14 PM 998 views 0 times favorited 9 replies Add to Favorites Watch
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JVallario

76 posts in 2612 days


10-25-2010 09:14 PM

I’ve had a small (yes cheap) 5 speed drill press which has served me well over the past few years. Recently the spindal or chuck has take to locking up when using larger bits – spade bits or fostner bits. I’ve re-tensioned the belt – changed speeds and even removed and reinstalled the chuck. The bits don’t slip but the whole assembly from the spindal down does. The pullys don’t stop and the bits are fine (used with a hand drill) and the unit has never been dropped. I’ve searched the net for help but come up empty. Any ideas or do I just need to buy a new one?

-- John


9 replies so far

View PurpLev's profile

PurpLev

8523 posts in 3110 days


#1 posted 10-25-2010 09:27 PM

so the chuck spins around the arbor? or does the chuck+arbor spins in the spindle?

what taper is your chuck and what taper is your arbor? does the arbor have the tang at the end? does your chuck have a screw to lock it into the arbor?

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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Gregn

1642 posts in 2445 days


#2 posted 10-26-2010 02:43 AM

Does the shaft the pulleys connected to turn with the pulleys, or are the pulleys spinning around the shaft. If their spinning around the shafts the shaft sheer key may have been sheared. Just a guess, had this happen to me before.

-- I don't make mistakes, I have great learning lessons, Greg

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Bradford

1434 posts in 3285 days


#3 posted 10-26-2010 02:46 AM

Does the motor whine just before it locks up? The motor may not be rated for torque that high.

-- so much wood, so little time. Bradford. Wood-a-holics unanimous president

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JVallario

76 posts in 2612 days


#4 posted 10-26-2010 02:48 PM

Thanks for the replies – both the shaft and chuck freeze up under pressure. I have no idea of the taper size. The motor does not whine at all. The shaft sheer key seems the most plausible cause though I would think it would stop even with small bits – which it doesn’t.

Gregn – were you able to repair this?

-- John

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Gregn

1642 posts in 2445 days


#5 posted 10-26-2010 06:16 PM

Take the pulleys off of the shaft there should be a shear key if this is damaged this will more than likely be the problem. If there is no slot for the shear key then check your set screws to be sure they are in contact with a flat spot for the set screw. It sounds as if this is the problem. Check with your local machine shop supply store they should carry shear keys and set screws that fit by size and not by brand. One way to tell if you have shear keys is to look at the top pulley there should be a slot that slides down the pulley for the shear key to ride in.

-- I don't make mistakes, I have great learning lessons, Greg

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JVallario

76 posts in 2612 days


#6 posted 10-26-2010 08:31 PM

Greg – thanks I’ll check that out.

-- John

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Gregn

1642 posts in 2445 days


#7 posted 11-01-2010 04:11 AM

Hey John, Just thought I’d check back and see how the drill press repair was going? Hope things are going your way with the repairs.

-- I don't make mistakes, I have great learning lessons, Greg

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JVallario

76 posts in 2612 days


#8 posted 11-01-2010 06:38 PM

Hi Greg – I haven’t pulled it apart yet because I’m still working a project and using it with a drum sanding attachment. I did find a parts diagram and as it turns out there are no keyways or set screws. The spindle shaft screws into a pulley insert – reverse threads I’m sure. The only thing I can think is a problem with the bearings possibly from using the drum sander attachment and the the horizontal pressure on them. The only way to order replacement parts is with an 800 number and since it is China made I’m a tad hesitant to give my credit card out. I may end up just getting a new one when I’m finished with my current project.

-- John

View traupmann's profile

traupmann

124 posts in 2249 days


#9 posted 11-01-2010 07:35 PM

Gregn’s advice is very good. What you haven’t gotten to is that often the chuck is a Jacobs with a taper holding it in place. A rubber mallet can usually tap it free. Check your parts diagram. I doubt it is bearings because you say the shaft is turning. A bad bearing will either squeak or wobble like crazy. With the premise that there is something that under a load is beginning to slip, I’d check the taper or chuck attachment.

Keep us posted…

-- chas -- looking for Serta sponsorship to go Pro...

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