Last summer, I reported my problems with drill bits slipping in the
chuck of my little Delta DP350 bench drill press. At the time, I had a
Phase II Keyless (1/32 to 1/2 inch, JT33 taper, about $20) on it. I was
forced to tighten this chuck with a hook spanner and sometimes a strap
wrench, defeating the whole point of "keyless", and still it sometimes
slipped.

I was attracted to the keyed ball-bearing jacobs-type chucks, but none
were available in JT33 taper. So, I got a plain-bearing heavy-duty
keyed Jacobs chuck, made by Jacobs, for about $84 (MSC 08590093).

This works. Not a hint of slipping, though I had to tap it right
smartly with a rawhide-faced hammer to set it on the JT33 taper well
enough that the chuck wouldn't pop off when the drill broke through and
pulled on the chuck.

I would guess that the key issue is accuracy of machining all those
oddly shaped parts within the chuck. This keyed chuck is faster to
tighten and untighten than either the original jacobs-style chuck that
came with the DP350 or the Phase II keyless.

Joe Gwinn


The original thread is at " VFD recommendations sought; wearing
belts; slipping chucks" (18 June 2005).

Only the best in regards to keyless. Phase II is Chinese. My Albrecht
R-8 1/2" keyless has never slipped, even with 1" Silver and Deming
through 1/2" plate.
JR
Dweller in the cellar

Joseph Gwinn wrote:
Last summer, I reported my problems with drill bits slipping in the
chuck of my little Delta DP350 bench drill press. At the time, I had a
Phase II Keyless (1/32 to 1/2 inch, JT33 taper, about $20) on it. I was
forced to tighten this chuck with a hook spanner and sometimes a strap
wrench, defeating the whole point of "keyless", and still it sometimes
slipped.

I was attracted to the keyed ball-bearing jacobs-type chucks, but none
were available in JT33 taper. So, I got a plain-bearing heavy-duty
keyed Jacobs chuck, made by Jacobs, for about $84 (MSC 08590093).

This works. Not a hint of slipping, though I had to tap it right
smartly with a rawhide-faced hammer to set it on the JT33 taper well
enough that the chuck wouldn't pop off when the drill broke through and
pulled on the chuck.

I would guess that the key issue is accuracy of machining all those
oddly shaped parts within the chuck. This keyed chuck is faster to
tighten and untighten than either the original jacobs-style chuck that
came with the DP350 or the Phase II keyless.

Joe Gwinn


The original thread is at " VFD recommendations sought; wearing
belts; slipping chucks" (18 June 2005).


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On Sat, 14 Jan 2006 12:02:58 -0800, JR North
wrote:

Only the best in regards to keyless. Phase II is Chinese. My Albrecht
R-8 1/2" keyless has never slipped, even with 1" Silver and Deming
through 1/2" plate.
JR
Dweller in the cellar

I have several import keyless Albrecht knockoffs from Grizzley. I
got them some years ago, so they're more likely from Taiwan than
China.

They all work very well, slippage is very rare with just easy hand
tightening. They work much better than any key chuck I have. I
have not barfed up one drill shank in any of them.

Relating to the thread about Chinese quality, I have found a remarkable
difference in Taiwanese quality vs Chinese...have others seen the same?
I just purchased a Right-Angle arbor for my Bridgeport, got one made
in Taiwan, quite impressed with the quality...sharp threads, good
finish, very nice. Purchased similar items from "made in China" and
don't see any resemblance to the same quality.

Just looking for opinions on the difference, wonder if my sample
population is too low for generalizations....

John

I have noticed the same thing as well. Particularly with respect to
measuring tools, but I also have a taiwan made cnc bedmill that I have been
pleased with. In my limited experience, Taiwanese quality has been almost
universally better than Chinese. Chinese quality seems to be improving in
some areas and lagging in others.

StaticsJason

"CAMCOMPCO" wrote in message
ups.com...
Relating to the thread about Chinese quality, I have found a remarkable
difference in Taiwanese quality vs Chinese...have others seen the same?
I just purchased a Right-Angle arbor for my Bridgeport, got one made
in Taiwan, quite impressed with the quality...sharp threads, good
finish, very nice. Purchased similar items from "made in China" and
don't see any resemblance to the same quality.

Just looking for opinions on the difference, wonder if my sample
population is too low for generalizations....

John