Subject: Morse taper

From: [email-masked] (Carl)
Date: Wed, 25 Sep 1996 04:30:21 GMT

Several of the contributors to this newsgroup have commented on the fact that
the various Morse tapers have different amounts of taper per inch.

   The best explaination I have ever seen for this has to do with patents.  In
the past patent applications were usually acompanied by models or samples.  If
the originator of the Morse taper sent in samples of the various tapers then the
patent might have been based on the actual measurements of the samples, which
seem to form two groups. The taper in one group differs from the taper in the
other group.  Perhaps the inventor had to tear down the setup on his lathe
between groups.

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From: Dan Bollinger <[email-masked]>
Date: Wed, 25 Sep 1996 10:33:12 -0700

> other group.  Perhaps the inventor had to tear down the setup on his lathe

I've not seen any taper with a patent number on it, have you?

Tapers come in two types, ones that release by hand, and ones that require a hammer blow.  The wedging action 
is suited to the task.

Morse tapers are all about 5/8" per foot taper.

Brown & Sharpe are about 1/2" per foot.

Standard Steep Machine tapers (as in horizontal milling machines) are 3.5" per foot.

Check the Machinery's Handbook for specifics.

Dan Bollinger
Industrial Designer

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From: [email-masked] (Scott Logan)
Date: 25 Sep 1996 17:38:49 GMT

> Morse tapers are all about 5/8" per foot taper.
                       ^^^^^

> Brown & Sharpe are about 1/2" per foot.
                     ^^^^^
I think that is the point, they are ABOUT 5/8 or 1/2 inch per foot, but
all different.  And enough different that they are not interchangeable
even discounting the size difference.  IOW, you have to change your set
up for grinding or turning the various tapers.  

--
 ----------------------------------------
 Scott Logan [email-masked]
 09/25/96 12:38
 http://www.loganact.com

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From: [email-masked] (James Kirkpatrick)
Date: 25 Sep 96 15:17:36 MDT

In article <[email-masked]>, [email-masked] (Carl) writes:
|>   Several of the contributors to this newsgroup have commented on the fact that
|>the various Morse tapers have different amounts of taper per inch.
|>
|>   The best explaination I have ever seen for this has to do with patents.  In
|>the past patent applications were usually acompanied by models or samples.  If
|>the originator of the Morse taper sent in samples of the various tapers then the
|>patent might have been based on the actual measurements of the samples, which
|>seem to form two groups. The taper in one group differs from the taper in the
|>other group.  Perhaps the inventor had to tear down the setup on his lathe
|>between groups.

The more likely explanation is simply to prevent one Morse taper
>from  being fitted into the wrong "other end".

For example, if you try to stuff an MT3 arbor into an MT4 spindle,
or vice-versa, not only won't it fit well, but the mismatch in the
actual taper means it won't even begin to stick.  If the tapers were
the same, some dumb machinist might try to make such a set-up work
even though the taper engagement is a tiny fraction of what's needed.

Jim

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From: Jeffrey Prothero <[email-masked]>
Date: Wed, 25 Sep 1996 21:28:20 -0700

> even though the taper engagement is a tiny fraction of what's needed.
I hadn't thought of that possibility.  Another possibility is that the
taper has to be slightly different in the various sizes so that the tapers
lock and release.  Sort of the way that press fits have different
requirements for a half inch hole and a two inch hole.
			CHeers,