View
214
Download
0
Category
Preview:
Citation preview
7/28/2019 PM 06 Corner Finishing
1/12
PowerMILL 6. Corner Machining
Issue PMILL 6 93
6. Corner Finishing
Introduction.Corner Machining includes 5 different types of strategy: Pencil, Multi Pencil, Stitch
Corner, Automatic Corner andAlong Corner.One of the strategies creates 'single pass'
machining along sharp internal corners (Pencil) while the other four perform local machining
of areas inaccessible to a larger tool (Rest Milling).
All Corner Finishing strategies allow a Threshold Angle to be specified. PowerMILL limits
the toolpath to either side of this angle the idea being to solve the potential problems
associated with the tool running up or down steep slopes. For instance the user could apply a
stitch strategy to track across the steep areas and parallel strategy for shallow areas. Also a
higher feed rate could be used on the shallow areas and a lower feed rate on the steep areas,
which if applied first is more likely to be taking a heavy cut.
Pencil FinishingThis option produces single pass tool tracks along the intersection between sharp internal
corners of the component surface.
Select Delete Al l from the File menu and Reset forms from the Toolsmenu.
FromFile > Examples open the model cowling.dgk
Calculate the Block.
Create a Ball nosed dia 10 tool and name it as bn10.
Select an Iso2 view.
7/28/2019 PM 06 Corner Finishing
2/12
6. Corner Machining PowerMILL
94 Issue PMILL 6
From the Toolpath s trategies form, select Corner Pencil Finishing
Keep the thresholdangle of30 degrees.
Selecting both will produce the
steep and shallow toolpath.
Apply the toolpath andCancel.
7/28/2019 PM 06 Corner Finishing
3/12
PowerMILL 6. Corner Machining
Issue PMILL 6 95
The toolpath is split where the steep areas where the
slope exceeds the specifiedThreshold Angle
separately.
Animate the toolpath. Rename thetoolpath as pencil_both.
Right click over the toolpath in the explorerand select Settings.
Select the Copy Toolpath icon from the form.
Change the Output option fromBoth to Shallow.
SelectApply to generate the Shallow slope machining only.
The toolpath is produced. The steep area is no
longer machined.
Animate the toolpath. Rename the toolpath as pencil_shallow.
Right click over the toolpath in the explorer and select Settings.
Select the copy toolpath icon from the form.
Change the Output option fromShallow to Steep.
7/28/2019 PM 06 Corner Finishing
4/12
6. Corner Machining PowerMILL
96 Issue PMILL 6
Generate a steep pencil machining toolpath.
Only the steep area is machined.
Animate the toolpath. Rename the toolpath as pencil_steep.
Save the project inC:\temp as train-corner.
Corner Along Finishing
All the Corner Finishing
strategies, (except forPencil) are
based on machining the area
between the Reference tool (2) and
the Active tool (1).
In this example the main finishing
tool is a 12 Ball nose (reference) to
be Corner finished with a diameter
5 Ball-nose.
From the Toolpath s trategies form, select Corner Along Finishing.
Define a dia 5 ball nose toolnamed bn5.
In the Reference Area, select the tool bn10.
Change Output to Shallow.
SetCusp to 0.03.
Check Direction is set to Climb.
7/28/2019 PM 06 Corner Finishing
5/12
PowerMILL 6. Corner Machining
Issue PMILL 6 97
Apply the toolpath andCancel.
Animate the toolpath and note that
it has machined the shallow areas
from outside to inwards in a Climb
milling direction.
The leads and links need to be
improved
Set all the Links to Skim
7/28/2019 PM 06 Corner Finishing
6/12
6. Corner Machining PowerMILL
98 Issue PMILL 6
Select the Lead In tab
Select Vertical Arc and fill
in the values shown.
Click Copy to Lead out
Apply andAccept
The Vertical Arc leadprovides a smoother
transition onto the work
piece with the tool already
moving at the specified
cutting feed rate.
Open the Leads and Links form and change the Lead In/out fromVertical Arc back to None as the next toolpath to be created doesntrequire them.
Corner Stitch Finishing
From the Toolpath s trategies form, select Corner Stitch Finishing.
The previously used values are in the form.
Change Output to Steep
7/28/2019 PM 06 Corner Finishing
7/12
PowerMILL 6. Corner Machining
Issue PMILL 6 99
Apply the toolpath andCancel
The steep area has been machined.
If required, it is possible to change the Direction and/or
order of individual tool tracks via the Toolpath - Edit
options.
Right click on the toolpath and select Edit >Reorder.
7/28/2019 PM 06 Corner Finishing
8/12
6. Corner Machining PowerMILL
100 Issue PMILL 6
SelectAl ternate direct ions.
In Leads and Links select CircularArc
The steep areas now run in a zig-zag
direction rather than one way and this
time the Short links are defined as a
Circular Arc.
7/28/2019 PM 06 Corner Finishing
9/12
PowerMILL 6. Corner Machining
Issue PMILL 6
101
Corner MultiPencil Finishing
From the Toolpath s trategies form, select Corner MultiPencil Finishing
Change Output backtoShallow
Apply the toolpath andCancel
7/28/2019 PM 06 Corner Finishing
10/12
6. Corner Machining PowerMILL
102 Issue PMILL 6
Change theThreshold Angle to90
This has the effect of
creatingan unlimited
Shallow machining area for
the toolpath. Using these
setting the same strategy
would be created if the
Output- Both is applied. IfOutput - Steep is applied no
toolpath would be created.
Apply the toolpath and Cancel
7/28/2019 PM 06 Corner Finishing
11/12
PowerMILL 6. Corner Machining
Issue PMILL 6
103
Corner Automatic Finishing
From the Toolpath s trategies form, select Corner Automatic Finishing
Change Output toBoth
Change thethreshold angleback to 30
Apply the toolpathand Cancel
This strategy automatically uses
Along for the Shallow areas and
Stitch for the Steep areas.
However, due to it being all one
toolpath, it is not so easy to controlthe Leads and Links or the
Reordering.
7/28/2019 PM 06 Corner Finishing
12/12
6. Corner Machining PowerMILL
104 Issue PMILL 6
Recommended