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          Blender Tutorials: 608 Bearing - part 8






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Part 8 The Low Vertices Model




Append Turn off the transform manipulator (hand icon)
 
Transform Manipulator

Click File in the top left hand corner and select "Append or Link"

Navigate to the 608-Bearing.blend  and from the options choose "Object". The components will now be listed. RMB on the components highlighted. Objects
Join Bearing Components
The five components will now be loaded in your file. If they are not visible open the outliner and make sure the eye icon is open.

We need to join these components to make a single object.





Single Object In the outliner select the five components and then with the mouse cursor over the 3D window press Ctrl-J. The components will be joined into a single mesh.

Tab into Edit Mode and press A to select all the vertices.

We only need a single cross section of vertices above the centre of the bearing. 
This cross section will be modified to reduce the number of vertices and then spun around the centre to form the bearing.
Deselect Vertices In front view press B twice to bring up paint select, reduce the size of the selection circle with the SW and pressing 
the MMB paint over the vertices directly above the centre.

The vertices will become deselected. Press X and delete all the remaining selected vertices.





Cross Section Were now left with a cross section through the bearing but still with far to many vertices and a lot of unnecessary internal detail.

We will start stripping out the detail by remaking the corner fillets with a smaller Step: value.
Modify Fillet Select the lowest vertex on the top left corner fillet and extrude it 0.6mm on the Y axis. This will give us the fillet centre point.





Set Cursor Snap Ctrl-S, Cursor->Selection onto the fillet centre. select the existing internal fillet vertices and delete them.

Select the original lowest fillet vertex and in the Mesh Tools panel set Degr:90 and Step:4.



Spin
Press Spin to create the fillet, this time with three fewer vertices. Delete X the vertex on the fillet center.

Repeat this on the bottom left fillet.
We now need to create a continuous external profile of the bearing, combining all the outer vertices of the loose parts.

Cut two new vertices through the left circlip

Cut New Vertex
snapping the line to the edge of the circlip groove's chamfer.

K
Knife Exact,
snap the cut line Ctrl-LMB to the circlip groove chamfer's.





New Edge Add an edge between the groove and the circlip F.

Repeat this and cut a new vertex on the dust shield with the snap line cut from the lower right chamfer of the circlip
New Edge
The offset fillet's of the dust shield still have more vertices than are needed.

From the top vertex of the top fillet extrude an edge -0.1 in the Y axis.

Snap the cursor to this new vertex which is on the fillet centre.
Fillet Centre
Select the internal vertices of the fillet and delete them.





Prepare to Spin Select the top vertex from the original fillet and spin this to form the new fillet.

In the Mesh Tools panel set Degr:60 Step:4 and press Spin.

A new fillet has been created with three fewer vertices.
Spin
Move to the lower dust shield fillet and repeat the above process.

This time extrude the bottom vertex
Fillet Centre
of  the inner fillet 0.1mm on the Y axis to set the centre point. Snap the cursor to this.





Prepare to Spin
Spin
Select the bottom outer vertex of the original fillet and spin this Degr:60 Step:4 The vertices of the lower dust shield fillet have been reduced. Delete the fillet centre vertex.
Cut a new vertex on the inner race from the dust shield bottom fillet. K Knife Exact, Ctrl-LMB to snap the cut to the chamfer. l
Dust Shielt to Inner Race





Box Select

We now have a continuous outer edge of vertices down the left hand side of the cross section, rather than repeating this on the right hand side we can delete all the other vertices and mirror this line of vertices onto the right hand side.

Box select B all the vertices on the right hand side of the cross section including the bearing groves. Delete these X.
Select
                      Set Cursor
Paint Select B-B the remaining inner vertices and delete these.

Tab into Object Mode and snap the cursor to the object centre. Shift-s Cursor->Selection.





Mirror The cursor is now set on the bearing centre so we can mirror the left hand profile onto the right hand side of the bearing.

With the pivot point set to "3D Cursor"
Tab  into Edit Mode and select all vertices A.

Duplicate (copy) the vertices Shift-D then Esc to leave the copy over the top of the original.

Press Ctrl-M to open the Mirror  menu and choose "X Local". The copy will now be mirrored to the other side of the bearing.
Join Edges Re-make the top and bottom edge by selecting a vertex either side of the opening and pressing F.

Select all A and remove doubles W to merge any doubled up vertices.






Spin Go into front view NumPad 1.

In the Mesh Tools panel set Degr:360 and Step:32. Press Spin to form the 3D Bearing.

Select all A, remove doubles W and in the Link and Materials panel "Set Smooth".

As the bearing was created from the original components, an Edge Split modifier will still be activated on this object.
Completed Bearing





In the Link and Materials panel rename the object OB:608-BearingSmall.

Save the .blend file as 608-BearingSmall.

This version of the bearing has 2240 vertices, far fewer than the 26,000+ vertices of the detailed bearing. With 60 of these bearings in the CNC assembly it will still only require the computer overheads for 134400 vertices.

This completes the modeling of both versions of the bearing. In the next part we will look at adding basic materials to the bearing and rendering a 3D view and an exploded view of the bearing.





<< 608 Part 7 The Circlip Tutorials 608 Part 9 Rendering >>












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