Straightening bent Drill Press Spindle

I done it. Have an old Craftsman 15" floor DP that has had .008 runout in the spindle for a couple decades. Just used it for junk drilling, and very rarely. Decided to fix it quick and dirty, so rigged a dial gauge to read the chuck body, turned the spindle to max deflection, backed off the dial, and smacked the chuck with a BFH fairly hard. Recheck; .007. Hmmm. Smack; .005. Smack; .002. Smack; dead nuts. 'Bout time I did something with that. JR Dweller in the cellar

Reply to
JR North
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Way cool!

Harold

Reply to
Harold and Susan Vordos

Did you see the hair line cracks in the casting?

Paul

Reply to
co_farmer

I have an arbor-mounted R8 drill chuck (Rohm keyless, nice chuck) for my Excello vertical mill. A while ago I came in one day and found that it was running ~10 thou out, probably because someone accidentally cranked the vise into the side. I asked a couple of professional machinists and they told me to simply find the high spot and use the side of the vise to simply press it back. I tried it and it worked fine, although I ended up buying a new Jacobs ball-bearing Super Chuck for $40 and a new arbor. The old arbor, which was quite dinged-up, went into the scrap bin, while the Rohm keyless got a new MT2 arbor and was dedicated to lathe use. After measuring the TIR of the old chuck and arbor separately, I'm pretty sure that the runout was in the taper connection, and not an actual bending of either of the parts.

Reply to
woodworker88

JR, Reminds me of my first machining job in about 1967. I had one semester of machine shop, and was working in a shop to support a family. This particular day, I was drilling the bolt holes in the flange of a ~10" Brass globe valve. (Apparently the back rake angles were in semester #2.) Well, the 3/4" drill chaght, and threw that 75# valve across the shop. The boss was nice enough to let me straighten the quill, in an "H" press. (Or buy a new one.) The last guy bought a new table for the DP, after drilling holes in the table. Dave

Reply to
Mechanical Magic

Harold sez: "Way cool!" If Harold says something is cool, then you can bet it is cool! He even explained to me that BFH means "be fairly heavy".

Way cool!

Harold

Reply to
Robert Swinney

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