Subject: Sherline taper mounted chucks

From: John Bryant <[email-masked]>
Date: Sun, 28 Apr 1996 13:49:15 -0400

The 6" four-jaw chuck on my Standard Modern lathe is far too clumsy for
fine work, and for some time now I've been considering obtaining a
smaller four-jaw chuck for gripping smaller parts.  Now I've seen what
appears to be the answer - KBC is advertising a 3" four-jaw chuck (by
Sherline) directly mounted on a Morse 4 taper (which matches my
spindle).  Also it's currently on special at 10% off.  I'm a bit
reluctant, however, to splash out $220 on a part that I've never seen
and which may not turn out to be a good idea.

Could anybody comment on the part itself (quality?) and whether using
a taper mounted chuck is or is not a very good idea?  As an alternative
I could, of course, always mount a small four-jaw chuck on a backplate,
but small four-jaw chucks seem hard to come by, and D1-3 back plates
are not cheap.

           Thanks - John Bryant ([email-masked])

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From: [email-masked] (J.A.Harvey )
Date: 29 Apr 1996 04:22:16 GMT

>           Thanks - John Bryant ([email-masked])

John:

The Chuck that you are describing will knowck your eyes out when you
get it. The quality that Joe Martin ( The president of SHERLINE ) puts
into his tools is very impressive. It's no secret here that I am a
SHERLINE supporter ( so much so , that we recently became SHERLINE
dealers). I think that if you buy the chuck, you'll not let anyone pry
it from your hands!
By the way, and not to make this into a commercial, but if you send me
the part number that you are looking at ( remember, we're NEW SHERLINE
dealers!) I'll see if I can do better on the price for you ( That goes
for anyone else reading this group as well.)

Good luck on your project.

Jim Harvey
[email-masked]
http://hre.com/

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From: [email-masked] (Mark Fraser)
Date: 29 Apr 1996 13:40:41 GMT

and I've seen them being made at the factory.  I agree, impressive!
/mark

J.A.Harvey ([email-masked]) wrote:
: In <[email-masked]> John Bryant <[email-masked]>
: writes: 
: >
: >The 6" four-jaw chuck on my Standard Modern lathe is far too clumsy
: for
: >fine work, and for some time now I've been considering obtaining a
: >smaller four-jaw chuck for gripping smaller parts.  Now I've seen what
: >appears to be the answer - KBC is advertising a 3" four-jaw chuck (by
: >Sherline) directly mounted on a Morse 4 taper (which matches my
: >spindle).  Also it's currently on special at 10% off.  I'm a bit
: >reluctant, however, to splash out $220 on a part that I've never seen
: >and which may not turn out to be a good idea.
: >
: >Could anybody comment on the part itself (quality?) and whether using
: >a taper mounted chuck is or is not a very good idea?  As an
: alternative
: >
: >           Thanks - John Bryant ([email-masked])

: John:

: The Chuck that you are describing will knowck your eyes out when you
: get it. The quality that Joe Martin ( The president of SHERLINE ) puts
: into his tools is very impressive. It's no secret here that I am a
: SHERLINE supporter ( so much so , that we recently became SHERLINE
: dealers). I think that if you buy the chuck, you'll not let anyone pry
: it from your hands!
: By the way, and not to make this into a commercial, but if you send me
: the part number that you are looking at ( remember, we're NEW SHERLINE
: dealers!) I'll see if I can do better on the price for you ( That goes
: for anyone else reading this group as well.)

: Good luck on your project.

: Jim Harvey
: [email-masked]
: http://hre.com/

---

From: Jim Kovar <[email-masked]>
Date: Mon, 29 Apr 1996 18:00:20 -0700

>            Thanks - John Bryant ([email-masked])  
   It would seem that doing any turning would loosen the chuck from the 
spindle unless held in by a draw bar. Of course, I could be mistaken. I 
like to have any kind of a taper mounting that I am putting side forces 
on to be held securely.
                          Jim

---

From: [email-masked] (Peter Brooks)
Date: 2 May 1996 17:51:59 GMT

Jim Kovar ([email-masked]) wrote:
:    It would seem that doing any turning would loosen the chuck from the 
: spindle unless held in by a draw bar. Of course, I could be mistaken. I 
: like to have any kind of a taper mounting that I am putting side forces 
: on to be held securely.
:                           Jim

Am I missing something here?  I thought a Morse taper will hold (almost)
anything, regardless of the side loads.  Granted, a Jacobs taper is
more likely to self release, but Machinery's Handbook classes the MT as
well within the self-holding range.

I'm considering doing a #3 MT to 3/4 x 16 adapter for my Taig chucks.  Since
the load is relatively constant (unless I'm roughing a square piece or 
whatever), I would expect to be able to skip the drawbar.

Pete Brooks

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From: [email-masked] (James Kirkpatrick)
Date: 3 May 96 14:30:39 MDT

In article <[email-masked]>, [email-masked] (Peter Brooks) writes:
|>Am I missing something here?  I thought a Morse taper will hold (almost)
|>anything, regardless of the side loads.  Granted, a Jacobs taper is
|>more likely to self release, but Machinery's Handbook classes the MT as
|>well within the self-holding range.

I always thought "self holding" simply meant the tapers would not
slide apart all by themselves, e.g. how an R8 taper is supposed to work
(but doesn't, always).  Obviously under *some* loads the taper will
separate, else it would be a permanent assembly method!  Typically a
taper-mounted object (e.g. dead/live centers, drill press chucks) is
subjected to mostly axial loads.  The FAQ warns that using a drill press
as a cheap mill can cause problems due to the side loads, and I've assumed
the information came from experience.

Certainly, a large taper and small side loads might be safe, especially
if coupled with some axial loading (such as from a tailstock center).
But from what I've heard heard, this sounds like a dangerous practice.
If a taper-mounted chuck *does* work loose, consider the impact (in more
ways than one).

Actual experience from others on this topic would help!

Jim

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From: [email-masked] (Paul Pierce)
Date: 13 May 1996 01:30:45 GMT

[email-masked] (Paul Pierce) wrote:
>
>MSC offers, in their latest sale flyer, 3" chucks with 5C mounting.  
>Sounds slick for small work.  Use your 5C drawbar.
>[email-masked] (Paul Pierce) wrote:
MSC IS 1-800-645-7270

ALSO

KSB (1-800-521-1740)  OFFERS ON PAGE 306, SEVERAL SHERLINE MOUNTED CHUCK 
OF 3" AND 4" BOTH 3 JAW AND 4 JAW WITH DIFFERENT SHANKS.

MARK ROGO (MORTON) HAD A POSTING A COUPLE OF DAYS AGO HERE OFFERING 
SHERLINE EQUIPMENT.

  PAUL PIERCE in AJ AZ
  [email-masked]
  NRA Endowment Member