ET 449
CNC LATHE OPERATIONS:  O.D. TURNING and  External Threading
                 LABORATORY 3

Purpose:  This exercise will cover the basic procedures for Outside Diameter (O.D.) turning and external threading operations in OneCNC.   File importing, coordinate systems, CNC options, tool selection, and tool path generation will be covered.  Note:  This part will be used in lab 5 as a support fixture for 4th axis machining.

Objectives:  After completing this exercise you should be able to perform the following:

1. Import a dxf file into OneCNC
2. Edit the file for delineating required geometry
3. Set the coordinate system for the lathe operations (lathe radius)
4. Select the geometry to be turned
5. Specify tooling information required
6. Modify cut control as necessary
7. Generate a tool path for the part specified
8. Post-process tool path for a HAAS lathe
9. Save the file as a PLAIN ASCII format
10. Download file to the HAAS TL-1 lathe
11. Run the program (under supervision) and produce the required part.

Procedures:

Prior to using OneCNC, create a model or 2D drawing of part shown in the following section.  You may create the geometry using a 3D package of your choice (i.e. ProE, ProD) or create using AutoCad or equivalent.

Steps necessary for creating a tool path are provided with graphical illustrations .
Major steps include the following:

STEPS:
   1.  Create DXF
          2. Edit and remove non-essential lines
                3. Delete all geometry below the Center Line (C.L.) of the part.
                    4. Change coordinate system to LATHE RADIUS
                          5. Move object so that 0,0 is located at the right, C.L. of the part
                               6. Select NC Lathe
                                    7. Select Turning Option
                                         8. Select geometry to be machined
                                              9. Click DONE and edit tool information
                                                   10. Edit Cut Control and turn on undercut
                                                         11. Select RETRACT AND CLEARANCE
                                                             12.  Select OD geometry for threads to be cut
                                                                 13.  Select Threading Tool
                                                                    14.  Edit cut control and select R.H. threading
                                                                       15.  Specify RETRACT AND CLEARANCE
                                                                           16. Save and transfer to HAAS
                                                                               17. Produce Part (will assistance from lab instructor)
                                                                                  18.  Write lab report and submit

The following part will be produced on a HAAS CNC lathe.

NOTE:  Thread Specification:   3/4 -10, UNC, Class 2
                                                Major Diameter:  .748
                                                Minor Diameter:  .625
                                                Thread Depth:     .0615   Depth = (Major - Minor) / 2
                                                Feed Rate:  General Approximation:  1/n or F = P  In this case F = .1 IPR

                                      3D - MODEL
 

                                                                                 ENGINEERING DRAWING :  EXPORT AS DXF
 
 

                   IMPORT INTO OneCNC,  DELETE ALL LINES (ONE SIDE OF CENTER LINE),  MOVE TO (0,0) AS SHOWN

PARTIAL LISTING OF CNC PROGRAM SHOWN ABOVE

SAVE TO FLOPPY
PROGRAM IS READY FOR THE HAAS CNC MACHINE:   NOTE MACHINE MUST BE SET UP !!!!!  SEE INSTRUCTOR BEFORE ATTEMPTING TO RUN!

COMPLETE LAB REPORT USING STANDARD FORMAT AND SUBMIT.