Hi All:
Just received my new Jet 17″ drill press, you know the one with the Laser. Real nice machine, sturdy and well built. Question is:
I installed my own Jacobs ball bearing chuck instead of theirs. I then inserted my 1/2″ high speed steel drill blank (plus or minus 1/000th) to check for run out and table alignment. I did notice some run out at the lowest point of the blank until I reinserted it a few times in the chuck which cured that pretty much although it’s still out a few thousandths. I then inserted a brand new Forest City 1/2″ Forstner Bit (CORRECTION “BRAD POINT BIT) to make some holes.
What I noticed is when the point of the bit just touched the wood I could see that it was OUT OF ROUND (it would actually move the wood) and as I continued the downstroke the wood began to wabble and or vibrate. I’m not quite sure what is causing the problem; the bit, the chuck or the press itself. I removed the Jacobs chuck and installed the Jet chuck with the same results. I reinserted the bit several times thinking it may not have been sitting squarely in the chuck but that didn’t help any. Your thoughts please. Since my 1st post I am thinking that the Forest City Brad Point Bit is out of round but find it hard to believe. I’m still experimenting and testing. Tomorrow I will actually bring out the Dial Indicator and measure the run out with the Steel Drill Blank and see where that goes. Thanks for your comments and suggestions thus far. Stay with me on this subject until it is rectified please.
Edited 3/28/2009 11:11 pm ET by AL800
Replies
I would guess that there is a bunch of grease in the spindle hole of the drill press and you need to clean it out to get the chuck seated correctly. If the grease is heavier on one side it will cause the chuck to be mis-aligned. I would check the spindle hole and clean it with a solvent and a brush, and clean the Morse taper of the chuck too. If you get them clean and still have runout I would contact the dealer. I hope this helps.
Bruce
If you hold a fine felt tip pen up to barely touch the bit while it is spinning, you can mark the high point of each revolution. Then rotate the bit in the chuck, a couple of times and repeat the drill with the pen. If the marks stay on the same side in each chuck position, this would indicate the bit is not true.
If it stays in the same position relative to the chuck, that would indicate a chuck or the shaft that it mounts on.
However, for a drill-press to move up and down freely, requires a little play, both in the quill, and inside the step-pulley where the shaft and key travel.
Belt memory can induce some vibration
A few thousands on the end of the drill rod. How much of the rod are you chucking? What is the reading on the drill rod at the bottom of the chuck? Could your drive belt be causing the vibration? Get a reading turning the spindle by hand. I would make sure everything is clean. (I'm sure you did.) I would trust you Jacobs chuck over anything from overseas.
If the morse taper isn't the issue, it could be that the bit isn't held properly in the chuck. I find that sometimes, with small diameter bits (under 1/8" especially), they will sometimes wobble unbelievably, but if I release it from the chuck and try again, it is fine. You can also try tightening the chuck using all three holes. That may help. And try the forstner bit in another drill to see if it isn't the bit that's the problem, though by the sounds of the drill rod, it's not.
Chris @ www.flairwoodwork.spaces.live.com
(soon to be www.flairwoodworks.com)
- Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful. - Albert Schweitzer
Two areas I would immediately check: first, make sure the drill press taper socket is clean and grease free and second, make sure the drill chuck socket is also clean (most chucks require an adapter to go between the chuck and drill press--these work on a friction fit, must be spotless and all three pieces of drill press socket, drill chuck and adapter must not have any burrs). Various tapers for the sockets and adapters are used and noted by the manufacturer, called out Morse Taper and Jacob Taper with numbers dependent upon size.
T.Z.
Bent drill, do not fret.
Teaches drilling.
I am NOT sure I can describe the answer. Only from metal working from me that moved to wood for some reason.
Make a PIONT or target? Move the drill bit down to the target.. Carefully! If you miss the target, try again.. Hit and miss a few times and then ON TARGET! I sure hope your target was clamped well!
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