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Copyright © 2021 Quality Machine Tools, LLC
PM-1340GT v8 2021-04
Figure 3-28
PM-1340GT Taper turning attachment
PM-1340GT TAPER TURNING ATTACHMENT
This is a t
oolroom-quality fixture that can be retrofitted
to any PM-1340GT lathe manufactured later than 2015.
It is a self-contained, center-pivoted design that is at
-
tached by a single clamp at any point along the lathe
bed. It handles tapers up to 10 inches long, with half-an
-
gle from zero to +/- 10 degrees. Taper angle is precisely
settable by micrometer-style screw adjustment.
Before installing the attachment, make certain that its
two sliding components — Dovetail slide and Follower
carriage — move freely without side play. Adjust the gibs
and lubricate if necessary.
Bear in mind that setting up any taper attachment is an
iterative, cut and try process. In particular, if you will be
using for reference a precision ground bar between cen-
ters, first be sure that the tailstock is zeroed accurately
— no offset — before working on the taper attachment.
The same applies to copying the taper on existing tools,
such as taper-shanked reamers, many of which have
center holes drilled both ends. [Center-to-center align-
ment is not an issue if the reference item can be held in
a chuck, in which case it is only necessary to adjust for
zero runout at various points along the axis.]
When copying a reference taper, be sure that the in-
dicator probe is exactly at center height.
The taper attachment can remain in place for regular
