7. Computer-Controlled Machining¶
Setup/Schedule¶
Mar 05: computer-controlled machining¶
- Mar 06-07: Design in Fusion (on line)
- Mar 06(Thu) 20-23
- Mar 07(Fri) 10-18
- Mar 07(Fri) 20-23
- Mar 08(Sat): Day 1 (2 students + Instructor)
- PickUp 10:00 at Takatsuka Sta. at North Gate
- Material at Homecenter
- Fablab Hamamatsu
- Pack and take home
- Mar 09(Sun): Day 2 (1 student + Instructor)
- PickUp 10:00 at Takatsuka Sta. at North Gate
- Pack and take home
Tips: Large format CNC
Key
Key is parametric design
| Parameter | Value [mm] |
|---|---|
| tool_diameter | 6 |
| material_thickness | 9-12-15 (±0.3 ?) |
| material_width | 910 |
| material_length | 1820 |
| kerf | 6? (Group Assignment) |
| clearance | 0? (Group Assignment) |
三六板:910x1820mm
四八板:1230×2430mm
Assignment¶
Group Assignment¶
Group Assignment
do your lab’s safety training
Safety training TAKE-SPACE Large CNC Training Docs
Safety
- Eye protection
- Shoes
- Clothes
- Hair
- Gloves
Group Assignment
test runout, alignment, fixturing, speeds, feeds, materials, and toolpaths for your machine
Tips: Large format CNC
Runout, Alignment¶
Mill Square(100x100mm and 50x50mm) and measure
Files
- LargeCNC_Group.f3d
- EntireSketch_ShaperSVG.svg
- Faces_ShaperSVG.svg
- EntireSketch_shaper1820x910.ai
- EntireSketch_shaper300x400.ai
Fixturing¶
Ref. How to use Hamamatsu CNC_FA2022
Speeds, Feeds¶
The Feeds and Speeds
The speed at which we move a cutter across the material is called the “feed rate”.
The rate of rotation is called the “speed” and is controlled by how fast the router or spindle turns the cutting tool. Both feed rate and spindle speed will vary based on the material being cut. A general rule of thumb is that you want to move the tool through the material as fast as possible, without sacrificing surface finish. The longer the tool rotates in any one place, the more heat that builds up. Heat is your enemy and can burn your material or radically decrease the life or your cutting tool.Feed rate vs spindle speed: Spindle speed that is too fast paired with a slow feed rate can result in burning or melting. Spindle speed that is too slow paired with a faster feed rate can result in dulling of the cutting edge, deflection of the end mill and possibility of breaking the end mill.
Ref. Berytech Fab Lab
Individual Assignment¶
Individual Assignment
make (design+mill+assemble) something big (~meter-scale) extra credit: don’t use fasteners or glue extra credit: include curved surfaces
-
Set your material thickness as a parameter in your design
-
Mill a joint from your design with your material
Note
Hamamatsu CNC is using the 1 flute straight bit (Tool_dia: 6mm, Shank_dia: 12mm) by default.
Learn about Up cut and Down cut endmill from the Tip CNC tool