Cnc_Tutorial_Mastercam_1.pdf
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CNC_TUTORIAL.indd
MasterCAM
version Mill9.1
Tutorial chapters:
1. Importing IGES ile into MasterCAM
2. Tool path setup
a. Setting job parameters: stock boundaries,
creating a bounding box, selecting the stock
origin.
3. Surface toolpaths:
a. Rough cut
b. Finish cut
4. Setting toolpath parameters
a. Creating a new tool
5. Preparing for machining; post processing
a. Checking toolpaths for collisions and gouges
6. NC ile upload
7. Router Functions
Routing is an effective method for machining materials such as
wood (or wood byproducts), plastics, and rigid or high-density
foam. The tutorial chapters will enable you to generate g-code
.NC iles from an imported 3-D model to be machined by the
AXYZ4008 router at the GSD.
1.
Importing IGES ile into MasterCAM
Surface and solid models can be imported into MasterCAM from
environments that create watertight models. The Rhinoceros
platform is successful for exporting watertight .igs or .iges models.
(Note: FormZ is not suited to producing these models.)
Exporting your model from Rhinoceros
1. Prior to exporting your surfaces the entire Rhino model
needs to be located in the Cartesian positive X- and Y-axes
and the negative Z axis.
2. In Rhinoceros select
File / Export Selected
(follow the
Command prompt instructions and select the appropriate
surfaces.) An Export dialogue box will appear: create ile
name and save as an
IGES
*.igs, *.iges.
3. An IGES Export Options dialogue box will appear: scroll
through the IGES types, select
Mastercam
and select
OK
.
Importing your IGES ile into MasterCAM
1. Open the MasterCAM Mill9.1 icon.
2. Using the prompts at the top left of the screen select:
File /
Converters / IGES / Read File.
3. Browse to ind your ile and open it.
4. A dialogue bow will appear, accept defaults and click
OK
.
An addition dialogue box will appear, asking, “Delete the
Current Part?” Click
Yes
. Your model should now appear.
5. Press
F9
to toggle on/off the X, Y, Z-axes. The MasterCAM
location of your model will correspond to the Rhinoceros
exported position. To view your model obliquely, Right-
click for “dynamic spin” options.
Verify Surface Viability
1. Any initial machining problems can be identiied by the
following sequence.
2. First, testing the normals: select
Main Menu / Analyze /
Surfaces / Test Norms / All / Surfaces / Done
. A pop-up
window will then appear informing you of your model’s
integrity. If you have reversed normals, follow the
onscreen prompts to adjust the surfaces of rebuild your
model and re-import.
3. Second, testing the model for sharp internal corners that
may not be machinable: select
Main Menu / Analyze
/ Surfaces / Check Model / All / Surfaces / Done
. A
tolerance will be shown at the bottom left of the screen,
select
Enter
to accept
4. A pop-up window will appear with diagnostics of your
model. Click
OK
. If you had internal sharp corners,
MasterCAM will ask you if you wish to draw the internal
sharp curves. We recommend that you say no and either
proceed knowing that the machine may not be able to
reproduce your model as precisely as you have drawn it
or to redraw your model in the original modeling program
avoiding sharp internal corners and re-import. Take note
of the location of the curves that MasterCAM indicates
contain sharp internal corners before proceeding. And also
understand that you may be able to set parameters that
will minimize the differential between what is modeled
and what the machine is capable of cutting. See below for
details
2.
Tool path setup
Setting Job Parameters: stock boundaries
The stock boundaries help you visualize the part you are
machining during the toolpath veriication.
1. Choose:
Main Menu / Toolpaths / Job setup
2. Choose:
Select corners
3. Select one corner of the stock using the Point Entry
system and then select the opposite corner. The system
automatically ills in the X, Y, and Z ields based on the
geometry you selected.
4. Choose
OK
if you accept.
Note: you can only set up rectangular stock
Setting Job Parameters: creating a bounding box
A bounding box deines the stock limits by inding the extents of
the selected geometry.
1. Choose:
Main Menu / Toolpaths / Job setup
2. Choose:
Bounding box
3. Select the entities around which the bounding box is
deined.
4. Choose:
Done
Setting Job Parameters: selecting the stock origin
The stock origin adjusts the position of the stock. You can set the
stock origin to any corner of your model.
1. Choose:
Main Menu / Toolpaths / Job setup
2. Choose:
Select origin
3. Select a point in the graphics window. The system returns
to the Job Setup dialog box and ills in the stock origin X,
Y, and Z-coordinate based on the point you selected.
4. Click
OK
and leave the remaining defaults as they are set.
3.
Surface Tool paths
Rough Cut
Rough toolpaths remove large amounts of material from surfaces
as rapidly as possible. A rough cut is not required for milling
foam. A rough cut is required when removing wood. Note: be
sure to leave 1/16” of material for your inish cut.
1. Choose:
Main Menu / Toolpaths / Surface /
2. Ensure that the
Surface
settings shown at the top left of the
interface are as follows:
a. Drive:
S
b. CAD ile:
N
c. Check:
N
d. Contain:
N
3. click
/ Rough
4. Select the “surface roughing.” Choose from a number of
preset paths that the tool will take (i.e., parallel, radial,
lowline, contour, etc.) These are all options for the
direction or manner in which the tool will make its cuts
over the surface of the object. To learn more about the
differences at this point, click on the help button.
5. If you choose parallel cut you will be prompted to tell
MasterCam whether you are cutting a boss or a cavity. Do
so accordingly (Boss is a positive, cavity is a negative. If
you have both or a complex form, choose
unspeciied
)
6. You will now be prompted to select the surfaces for
machining. Select all surfaces feature by clicking
All
and
then
Surfaces
. Do not worry if this automatically selects
an underside. You will verify that the machining is only
cutting the desired surfaces in the next steps. Click
Done
.
7. If you wish to select only speciic surfaces rather than
clicking
All
as described above, use the pointer and click
on each desired surface. When inished selecting, click
Done
. You may use the
unselect
button at the top left if you
accidentally choose a surface you didn’t intend to.
8. Again, once your surfaces have been selected, click
Done
.
9. A Toolpath Parameters Dialog Box will open. Follow the
directions in Chapter 4:
Setting Toolpath Parameters
to
set the parameters of your rough-cut, prior to setting the
Finish Cut parameters.
Finish Cut
Surface inish toolpaths are used to create precise surfaces after
roughing.
1. Choose:
Main Menu / Toolpaths / Surface /
2. Ensure that the
Surface
settings shown at the top left of the
interface are as follows:
a. Drive:
S
b. CAD ile:
N
c. Check:
N
d. Contain:
N
3. click
/ Finish
4. Select the Surface Finishing. This is the manner in which
the tool will make its cuts over the surface of the object. To
learn more about the differences at this point, click on the
help button.
5. You will now be prompted to select the surfaces for
machining. Select all surfaces feature by clicking
All
and
then
Surfaces.
Do not worry if this automatically selects
an underside. You will verify that the machining is only
cutting the desired surfaces in the next steps. Click
Done
.
6. If you wish to select only speciic surfaces, rather than
clicking
All
as described above use the pointer and click on
each desired surface. When inished selecting, click
Done
.
You may use the
unselect
button at the top left.
7. Again, once your surfaces have been selected, click
Done
4.
Setting toolpath parameters
Creating a new tool
1. After the defaults are set, a dialogue box will appear.
2. Under the “Tool Parameter” tab, in the Parameters dialog
box, right-click in the tool list area and choose
Create new
tool
.
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