ME 418

ME 418
M8, M9, & M10
Robert Peace
[email protected]
Before launching Mastercam for the 1st time:
 Open Windows Explorer & Navigate to:
 Computer  Windows (C:)  Users  NSID  Default
 Copy my mcamx7 folder
 H:  My Documents
 Paste my mcamx7 folder
Dimensioned Drawing
Set-Up Sheet
AL 6061-T6, Barstock diam. 50.8mm, Mat.L=96mm
July 2014
Hard Jaws, Ljaw = 47.3
M8 – Drawing in MasterCam
 Things to Ensure:
Coordinates are: D+, Z (diameter and Z)
Units are Metric
Machine Type is Baxter Lathe (Operations Manager)
File Save location is H: drive (if it is left on C:, you won’t
be able to access it).
 If undo is unavailable, Esc the function and it will be
M8 – Stock Set-Up
Chucking ~1/3 of
finished length:
65/3 ~ 20 mm
Total Length: 20+8.7+65+2 = 95.7
Round to 96.0 mm
Safety Clearance ~2mm,
round to 1.7 mm
Facing pass
after rounding
= 2.3 mm
Part-off Tool
Jaw Width = 47.3 mm
B=3.0 mm
W=4.0 mm
=8.7+65+2.3=75 mm
Grip Length ~ 20 mm (technically 20.3 (29-8.7)
Position along Axis, Z: -29.0
ZW= 47.3+1.7+3+4=56.0
M8 – Tool paths
First is Always a Facing Pass with tool ID#5
Leave stock behind for finishing passes.
Always “From Tool”
Reference points to ensure safe tool paths.
Lead in/Lead out parameters for some tools are
 Cut-off tool is always tool ID#130 and in position 8.
Cup Reference Points (D, Z)
For M9
 A printed, dimensioned (METRIC) drawing of your
work-piece. SEE PAGE 6 for Details.
 A printed listing of all tools used, in sequence,
maximum of 8 tools.
 Draw your part in AutoCAD, as it is a smoother import
than Solidworks.
 Draw part to Full Scale.
 Drawing already imported into MasterCam, and origin
set (see page 68 of the lab manual).
 All Roughing passes attempted in MasterCam.
 Templates for set-up sheet, drawing and Job Card can
be found on the ME 418 website.
For M9
 Design Considerations (see lab manual 6-9).
 Maximum diameter = 50.8 mm
 Maximum length <= 2.5* stock diameter
 Keep the bar-stock as thick as possible close to the
chuck for as long as possible.
 Very small diameters can result in unstable work pieces
and chattering (poor surface finish).
 Design should include circular arcs and straight lines.
 Tool #1 must be the reference tool – Tool ID#5 (T0501)
 Tool #8 must be the part-off tool – Tool ID#130 (T13001)
 Tool library is in the Lab Manual
 Late Penalties & Marking Scheme supplied on pages
3-6 of the lab manual.
Work Piece Datum & Tool Change
Positions, G50’s
 If these are not correct, collisions or “Machining Air”
can occur.
 Says where the cutting edge is in space relative to the
workpiece datum (Origin).
 When a tool change occurs, the Turret does not move,
but the coordinates X, Y change.
 This is because the tools cutting edge is in a different
 Description of calculations: Page 61 of lab manual
 Values for “cup” example: Page 63
Tool Change Video
CNC Code Debugging
 Unmodified Code found on page 56
 Debugging Tools:
 Mastercam Backplot
 Shows tool path, rapid moves, tool and holder
 Can be expanded (double blue triangles) to show coordinates D, Z, Y of
leading edge of tool during run through, rapids and feeds different colors.
 Can set to stop at any change in XYZ, (stop sign to right of progress bar).
 Mastercam Simulation
 Shows tool position using X, Y, Z coordinate system, not the
coordinate system used in the drawing process.
 X  Z in drawing
 Y  Radius in drawing (even though we used diameter programing)
 Z  Y in drawing (always 0.0 for our case)
 Plot.exe (similar to Backplot)
 Custom made DOS program to assist with student code debugging.
 Space.exe
 Custom made DOS program to space out CNC code to assist with
student debugging.
Due Before M10
 See Page 4-5 of lab manual.
 Two weeks after M9:
Completed Mastercam file - digital
Completed CNC Set-up sheet – hard copy
Completed Engineer’s Drawing – hard copy
Work Piece Datum & Tool Change Position (G50’s) digital
 3 School Days before M10:
 Debugged CNC code – MUST have been run through
SPACE.exe - digital
 Any corrections to G50’s, drawing or set-up sheet.
 Drawing and set-up sheet – hard copy (only if significant

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