6.2 CAM

Question 1

What are the standard components to Stereolithography (SLA)? (5)

Answer 1

1. Photopolymer
2. Laser/flash system
3. Ascending/Descending Platform
4. Solvent rinse
5. Post curing

Question 2

Speed is an advantage for fewer or more axes?

Complex geometry?

Answer 2

Speed - fewer axes

Complex geometry - more axes

Question 3

For resolution/detail, do you want more or fewer axes?

How about finish?

Answer 3

You want more axes for both resolution/detail and finish

Question 4

Which machines (more/fewer axes) cost more, have capabilities, and more variety of tools?

Answer 4

More axes

Question 5

Define Standard Tessellation Language (STL)

What does an STL describe and not describe? (color?)

Answer 5

File format native to stereolithography CAD software created by 3D Systems.

An STL file describes only the surface geometry of a 3D object without any representation of color, texture, or other common CAD model attributes.

Question 6

Define Tessellation

Answer 6

The division of a surface into smaller polygons, yielding a higher level of detail.

Question 7

3 Axis Milling allows you to control the X, Y, and Z planes. How does 4 Axis milling affect milling technique?

Answer 7

Rolling of the block

Question 8

How does 5 axis milling affect milling technique?

Answer 8

1. Changes axis of block

2. Axis of cutting instrument

Question 9

Two reasons for the “wet” in wet manufacturing? What are the 8 materials we wet manufacture?

Answer 9

1. Temperature control
2. Tool Preservation

A. Partially sintered zirconia
B. Fully sintered zirconia
C. Titanium/Titanium alloy
D. Fully sintered Cobalt Chromium alloy
E. (High) noble alloy
F. Glass ceramics (e.max)
G. Particle filled glass (vita)
H. PMMA and other polymers

Question 10

Three reasons for the “dry” in dry manufacturing? What are the four materials we dry manufacture?

Answer 10

1. Avoid water contaminates
2. Immediate sintering
3. Pre-sintering characterization

A. Partially sintered zirconia
B. Partially sintered cobalt chromium alloy (intron)
C. Wax
D. PMMA and other polymers

Question 11

Milling

• Higher or lower feed rate
• Cutting fluid optional or essential
• Used for what materials (5)
• Requires polishing?

Answer 11

1. Higher feed rate
2. Optional fluid
3. Acrylics, wax, zirconia, metals, carbide bur
4. No, great surface finish

Question 12

Grinding

• Higher or lower feed rate
• Cutting fluid optional or essential
• Used for what materials (1)
• Requires finishing?

Answer 12

1. Lower feed rate
2. Fluid essential
3. Ceramics - coarse diamond burs
4. Requires polishing/glazing