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| Back to Tutorials | |
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| Part 5 Completing the Bearing
Cage | |
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With
608-CageA now complete its time to go back to Cage B which we copied
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mirrored from cage A before the chamfers were added.
In
the outliner
click on 608-CageB, select the Eye icon to bring it into view and
close the eye icon of 608-CageA.
When
we originally mirrored the cage from 608-CageA, we effectively applied
a scale factor of -1 in the Y axis. Press N
to open the Transform Properties window, You will see
ScaleX:-1.000. To clear this back to ScaleX:1.000 we need to apply the
scale to the object. To do this press Ctrl-A
and accept "Apply Scale and Rotation". If you had simply changed the
number in the Transform Properties window to 1 the cage would have
flipped back to the other side of the bearing |  |
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In
front view select the vertices that make up the loops we cut
in the bridging section between the ball cups. Shift-Alt-RMB but
leave the vertices of the bottom bridging section deselected as these
are parallel to the |
X axis and the easiest to modify.
With
the vertex loops selected on all but the bottom section, press X to delete them |
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Zoom SW, pan Shift-MMB and rotate
the view MMB,
until you obtain a good viewing angle on the bottom face of the
remaining bridging section. Select the central bottom face. (Shift-RMB the 4
vertices on the corner of the face.)
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Switch
to top view and go into wire
view mode
Z. you will see the selected edges are not square because
they were cut from |
geometry originally
created from the ball bearing's UVspheer, so we need to square up the
edges.
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select
the face vertex on the outer surface of the cage and Shift-S snap
Cursor/>Selection.
Select the vertex on the
opposite end of the edge and Scale S
constrain X
to a scale point
of 0.
Repeat this on the other edge of the face. |
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Select
one of the edges that cross the bottom face. Go to side view and wire
view mode. You will see that the edge is not aligned to the Y axis,
this is because of the same reasons the edge above are not
square.
Extrude E
(Only Edges from sub menu) a face from this edge constrained
in the Z
axis. The length of the face is not important. We will use
this face to see what angle the edge is at. |
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In
the mesh tools 1 panel select edge angle and then select the four
vertices of the face. The angle of each |
face corner will be displayed.
To form the clasp we need to spin the bottom face 92.376 degrees.
Select only the bottom
two vertices and delete them X
as they were there just to obtain the required spin angle. |
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Select
one vertex on the inside edge of the bottom face and snap Shift-S
Cursor->Selection to position the cursor to the centre of the
spin
radius.
Shift-RMB
Select the other vertices of the
bottom face. |
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Go
to side view NumPad-3.
In the Mesh Tools panel set Degr:92.376 and Step:7 and press Spin.
Select all A
and remove doubles W
as we have also stacked |
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of the edge below the cursor. |
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Re-select
the newly spun face and Extrude E
(Region from sub menu) and 0.3
for
the distance. When you select region a new face will be extruded
constrained to an axis perpendicular to the original face.
If the face extrudes in the wrong direction press grab G constrain to Y
and distance -0.6
(-0.3 to bring it back to the cursor and -0.3 for the
correct position) |
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With
the vertices of the face still selected cut a new edge across the
centre of the face. K Knife
(Midpoints). Two new vertices will be
created.
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In
the Mesh Tools panel set Degr:90 and leave Step:7. Go to side view and
press Spin. The next section of the clasp will be formed. |
Select all A and remove doubles
W
to remove the vertices stacked under the cursor.
Re select the newly created face and extrude (Region) 0.2mm
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With
the vertices of the face still selected cut a new edge across the
centre of the face. K Knife
(Midpoints). Two new vertices will be
created.
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Select
the two new vertices and delete X (Edges). The edge
joining the two vertices and both faces either side will be deleted.
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Select one middle vertex and snap the cursor to it.
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Select
the two centre vertices and the two on the left edge. We will spin
these in front view to form the front radius of the clasp.
In the Mesh Tools panel set Degr:180 and Spin:14, go to front view and
then press Spin. |
As before select all and remove doubles.
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Select
the newly formed clasp and the four edge loops that make up the
bridging section. |
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We
are now going to Spin Dup the new bridging section with the clasp
around the cage.
Tab
into Object Mode and snap the cursor to the object centre.
Tab
back into Edit Mode.
In the Mesh Tools panel set Degr:360 and Spin:7.
Press Spin Dup to copy the bridging section between the cage spheres. |
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Select
all and remove doubles. |
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Its
now time to add the fillet around the edges of the cage. This time the
outer edge loops will also follow around the clasp.
Follow the details in Part
4 to add the Fillets but with Edge
Select activated make sure you select continuous loops that also
include the clasp.
Add the 0.05mm Fillets with the bevel Centre script.
Add the Edge Split Modifier also detailed in Part 4
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This completes OB:608-CageB
Press Ctrl-W
and save your work.
In the next section's we will add the dust shield and circlip to
complete the detailed model of the 608 bearing
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