Drill bit Wobble on new drill press

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Forum topic by Scottlee posted 06-20-2014 03:41 AM 1928 views 0 times favorited 8 replies Add to Favorites Watch
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4 posts in 1481 days

06-20-2014 03:41 AM

Topic tags/keywords: dril bit wobble set up new drill

I have a new Jet 17” Floor drill press. It took me a wile to get it out of the box and set up because I travel a lot for work. Read all the setup instructions. And have used it 12 to 13 times. The drill Chuck looked like it was wobbling.
But i thought it was me. I used it again today and the the bit tip made the wood wobble around as i was starting to drill. I called Jet and they said to take the chuck out clean it real good and put it back. Then take a block of wood and a hammer and smack it real good 3 or 4 times. I did that but the problem still exist. So i took it apart and put it back together 3 more times. To my dismay the problem still exist. I have ordered a new chuck and arbor to see it that is the problem. Any words of wisdom for me?

8 replies so far

View TheFridge's profile


9606 posts in 1509 days

#1 posted 06-20-2014 03:50 AM

From what I’ve heard, most of the problems with wobbling are fixed by what you already did a half dozen times. So a replacement chuck and arbor is about the only other thing it could be.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View TiggerWood's profile


271 posts in 1630 days

#2 posted 06-20-2014 03:56 AM

Have you used a dial indicator on the arbor? Are the arbor and chuck free of any scratches; are they smooth to touch? I’m sorry, I’d be tearing my hair out if I were in your position. And if the indicator shows that the arbor is out, I would not relent on Jet until they bend over backwards to satisfy me.

View neverenougftackle's profile


195 posts in 1870 days

#3 posted 06-20-2014 04:09 AM

Go to Harbor Freight and buy both the Machinist Dial and the magnet base, below. Set the base solid to your drills base, set the meter zeroed out at the end of one of you biggest bits. Check its run out by HAND TURNING the chuck, If it is more than the owners manual advertises then take out the drill and check the chuck same procedure zeroing out the meter again, If the chuck has a run out, same procedure remove the chuck and check the shaft.

What you are doing is the process of elimination, as used in all kinds of trouable shooting, If there is a stoped in the wobble slop, zeroed run-out in between your checks, than you have found your culprit. If there is a run out on the shaft its ether the bearings, shaft, bearing/shafts housing was mis drilled. The steel housing that surrounding that bearing has to be drilled to very close tolerances for that bearing to set into. Had a Delta scroll saw once some time back, that the upper arm mount was mis drilled. Nothing could be done Delta replaced the whole scroll saw.

One of these meter will become a great tool in your woodworking shop,,,,all kinds of jigs can be made with the accuracy of that meter,,,,VERY ACCURACE jigs and their corresponding cuts, mind you. 0.001

View MrRon's profile


4793 posts in 3267 days

#4 posted 06-20-2014 07:07 PM

Have you checked your drill bits? Cheap drill bits are not straight and will wobble. First check the drill bits. Use a 1/4” or larger high quality bit before doing anything else. If it still wobbles, then check the arbor.

View Fred Hargis's profile

Fred Hargis

4999 posts in 2517 days

#5 posted 06-20-2014 07:17 PM

Ron has a good point, don’t forget to check the bits you’re using. My old Delta DP had excessive runout that I isolated to the chuck, and a replacement solved my problem. Be aware, most chucks are imports anymore and you can just get another bad one. I was looking for a Jacobs brand chuck and had trouble finding it…I wound up buying an LFA industries chuck. It’s made in France, but very high quality.

-- Our village hasn't lost it's idiot, he was elected to congress.

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4793 posts in 3267 days

#6 posted 06-20-2014 07:18 PM

You don’t need a dial indicator. Just clamp a piece of wood or metal or anything to the table. Put a straight piece of rod in the chuck. Drill rod is best if available. Then rotate the chuck by hand and use a feeler gauge between the rod and block to find the min/max readings. It takes more time, but will save you the cost of buying a dial indicator, although they are handy for other purposes as well.

View MrRon's profile


4793 posts in 3267 days

#7 posted 06-20-2014 07:21 PM

You can buy quality chucks from industrial supply houses, like McMaster-Carr, MSC, Enco.

View Scottlee's profile


4 posts in 1481 days

#8 posted 06-20-2014 07:48 PM

I have a nice set of bits that i got from Lee Vally that I have be using. That’s how I noticed the Whobble. The bits did not act this way on my bench top Press.

I am borrowing a test rod for a CNC Machine where i work and will test to see what the Run out is.

I will be checking back with Jet to make the problem right. More on that later.

Thank you for you Help.

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