• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print

Home > Ordnance Documents and other related manuals > > Setting Up the Lathe.
General Lathe Operations and Machining
Table 2: Lathe cutting Sppeeds for Staright Turning and Threading

Lathe Operations
Page Navigation
  43    44    45    46    47  48  49    50    51    52    53  

LATHE OPERATIONS - OD1645 - LESSON 1/TASK 1
workpiece.  The methods of operation described in this lesson are general in
nature.
With  experience,  the  machinist  will  be  able  to  vary  certain
procedures with success for individual operations.
b.  Setting Up the Lathe.
Before starting a lathe machining operation,
always  ensure  that  the  machine  is  set  up  for  the  job  that  is  to  be
accomplished.  If the workpiece is to be mounted between centers, check the
alignment  of  the  headstock  center  with  the  tailstock  center  (live  or
deadcenter) and make the necessary changes as needed.
Ensure that the
toolholder and the cutter bit are set at the proper height and angle.  Check
the workholding accessory to ensure that the workpiece is held securely.
Use the center rest or follower rest to support long workpieces.
(1) The  first step in preparing the centers is to see that they are
accurately mounted in the headstock and tailstock spindles.  The centers and
the tapered holes in which they are fitted must be perfectly clean.  Chips
and dirt left on the contact surfaces will impair accuracy by preventing a
perfect fit of the bearing surfaces.  Be sure that there are no burrs in the
spindle  hole.
If  burrs are  found,  they must  be  removed  by carefully
scraping or reaming the surface with a Morse taper reamer.
Burrs will
produce the same inaccuracies as chips or dirt.
(2) Center points must be accurately finished to an included angle of 60.
Check the angle of the center with the use of a center gage.  If the test
shows that the point is not perfect, true the point in the lathe by taking a
cut  over  the  point  with  the  compound  rest  set  at  30.
The  hardened
tailstock center must be annealed before it can be machined or set up in the
lathe and ground with the use of a toolpost grinder.
c.
Lathe Speeds and Feeds.
(1) General.
Determining the most advantageous feeds and speeds for a
particular lathe operation depends on numerous factors such as the kind of
material being worked on, the type of tool, the diameter and length of the
workpiece, the type of cut desired (rough or finished), the cutting oil
used, and the condition of the lathe being used.
48






Western Governors University

< Previous Page
Index ^
Next Page >

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.