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Posted by JR North on February 5, 2008, 10:00 pm
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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
--
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Home Page: http://www.seanet.com/~jasonrnorth
If you're not the lead dog, the view never changes
Doubt yourself, and the real world will eat you alive
The world doesn't revolve around you, it revolves around me
No skeletons in the closet; just decomposing corpses
--------------------------------------------------------------
Dependence is Vulnerability:
--------------------------------------------------------------
"Open the Pod Bay Doors please, Hal"
"I'm sorry, Dave, I'm afraid I can't do that.."
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Posted by Harold and Susan Vordos on February 5, 2008, 11:05 pm
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>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
Way cool!
Harold
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Posted by Robert Swinney on February 6, 2008, 9:18 am
Please log in for more thread options 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".
BFH Swinney
>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
Way cool!
Harold
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Posted by pdrahn@coinet.com on February 6, 2008, 12:04 am
Please log in for more thread options > 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
>
> --
> --------------------------------------------------------------
> Home Page:http://www.seanet.com/~jasonrnorth
> If you're not the lead dog, the view never changes
> Doubt yourself, and the real world will eat you alive
> The world doesn't revolve around you, it revolves around me
> No skeletons in the closet; just decomposing corpses
> --------------------------------------------------------------
> Dependence is Vulnerability:
> --------------------------------------------------------------
> "Open the Pod Bay Doors please, Hal"
> "I'm sorry, Dave, I'm afraid I can't do that.."
Did you see the hair line cracks in the casting?
Paul
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Posted by woodworker88 on February 6, 2008, 12:24 am
Please log in for more thread options 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.
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>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