CNC
From Chalmers Robotförening
Security-rules
- You must have taken the CNC-course by Chalmers Robotics to run the CNC-mill
- Always follow the Checklist
Specification
| Brand
|
Optimum
|
| Modell
|
|
| Max-X-travel
|
ca 480 mm
|
| Max-Y-travel
|
ca 128 mm
|
| Max-RPM
|
ca 3000 ( vid hög växel)
|
| Max-Jog-speed
|
1500[mm/minute]
|
some hints:
- Max travel does not determine the maximum dimension of the piece you can manufacture, you have to take into acount that the tool has a diameter which you need to subtract from max "work-area".
- It's recomended to not attempt to manufacture a piece bigger than 110x400mm in one run.
- If you need to manufacture a piece bigger than 110 in both x and y direction, you may manufacture it in two runs ( but this is difficult and time-consuming).
CNC Milling calculating-rules
RPM [Revolutions per Minute]
| Material
|
M
|
| Polycarbonate
|
20000
|
| Aluminium
|
10000
|
| Nylon
|
7000
|
| Steel
|
5000
|
- A typical RPM could be 3000
Feed-rate [mm/minute]
- Feedrate = K * ToolNumberOfTeeth * RPM
- K is the width of each teeth-stroke in the material in mm.
- K is usally 0.05
- K is maximum of 0.2 for rough finish in soft materials
- K is maximum of 0.1 for aluminium
- K is maximum of 0.05 for steel
- K should be 0.025 for high finish (almost glossy) DON'T use a lower K!
- K defines how fine the cut should be
- A typical Feed-rate could be 300 mm/min
Plunge-rate [mm/minute]
| Små frässtål (3 - 5 mm)
|
Plunge-rate = 20% av Feed-rate
|
| medelstora frässtål (5 - 8 mm)
|
Plunge-rate = 10% av Feed-rate
|
| stora frässtål (8 - 14 mm)
|
Plunge-rate = 5% av Feed-rate
|
