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Harold & Susan Vordos
 
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Default What is a second operation lathe?


"Abrasha" wrote in message
...
George wrote:

Matthew matthewjameslee*yahoo.com wrote:

I have seen the harding tool room lathe and understand that is also

called
a "secind operation lathe" But why is this?


I think you're talking about two different animals. Though the
terminology is confusing.

The Hardinge TFB doesn't have a lead screw and is often called a
Secondary Op. lathe. The HLV-x does have a leadscrew and is generally
termed a Toolmaker's lathe.

But the terms are loosely applied and often used to conceal the fact
that the TFB sells for a lot less than the HLV.

If you are not going to use the lathe for thread turning, then all you
need is the TFB.

George.


I don't think that answers the OP question. I don';t think that having a

lead
screw has anything to do with it.

It is my understanding that a "second operation" lathe is exactly what the

name
implies. It is a lathe on which a different (second) operation is

performed
than on the "first opreation" (there is no such term I think) lathe.

This is done so no setup change is necessary on the first lathe. The

parts to
be machined in the "second operation" are just moved form the first to the
second lathe. Having second operation lathes can save a great deal of

time in
the production of parts.

Abrasha
http://www.abrasha.com


The Hardinge lathe that is termed a "second operation" lathe has an 8
station turret in place of the typical carriage, and no tailstock. They
are not an engine lathe, and lack a lead screw. They have thread cutting
ability thanks to master thread collars and followers. They are a very
accurate machine when in good condition.

Parts to be machined are generally either pieces of stock already cut to
length or have the first side machined on another machine, turret lathe or
engine lathe, have been parted to rough length and are chucked or otherwise
held to have the parted off side, or second side, finish machined. These
machines are also known as chuckers. They are inclined towards production
work, as are turret lathes. They would not be a good lathe to own without
an engine lathe due to the greatly restricted capabilities of such machines
for general machine work. You can take a look at one he
http://www.lathes.co.uk/hardinge/page5.html

Harold