8. Computer controlled machining¶

Assignment¶

Group assignment Test runout, alignment, speeds, feeds, and toolpaths for your machine
individual project Make something big on a CNC machine.

Group Assignment¶

Group assignment documentation

Concept of something Big¶

Examine the form factor of potential final project
Use a joint that are not feasible by laser cutter
- Pocket type joint
  - Research: Traditional Joints
- I also researched Kerf bend for the center enclosure that mainly include mist generator and projector
  - Kerf spacing calcurator
  - FabAcademy project

Design¶

Fusion360¶

Defined some parameters.

Sketched the table top and leg.

Excluded the sketch to the thickness of the board.

Leg was jointed to the table.

Extruded the center part. It is the enclosure of the mist unit and the projector.

Sketched some fire wood branches.

Excluded the branches and put them into the holes of table.

I examined the design with 1/5 model (laser cutter)

vCarve¶

I defined the parameters based on the result of group work.

2D outline tool path
- Cut depth = 15.5mm ( board thickness + 0.5mm)
- End mill = 1/4” Down-cut(57-910)
- Speed 12,000 RPM (Spindle Rotation Speed)
- Feed 3.0inch/second
- Path = 3
- Vector processing = Outline
- Add Tab
Pocket tool path
- Depth = 5mm
- End mill = 1/4” Down-cut(57-910)
- Speed 12,000 RPM (Spindle Rotation Speed)
- Feed 3.0inch/second
- Path = 3
- Clear pocket = offset

Preview

Time and order

Machine settings¶

I did AIR CUT at the height of Z=50 to confirm the path.

Problem:
At the beginning of AIR CUT, the machine stopped when moved to origin point. I checked the settings, then found that the XY offset was set by default. So I removed the offset setting and tried again, then the Shopbot started milling properly. I have to check all settings carefullr, especially when we have to share a same software with other users.