Difference between revisions of "CNC"
From Chalmers Robotförening
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==Feed-rate [mm/minute]== | ==Feed-rate [mm/minute]== | ||
*Feedrate = K * ToolNumberOfTeeth * RPM | *Feedrate = K * ToolNumberOfTeeth * RPM | ||
*K is the width of each teeth-stroke in the material | *K is the width of each teeth-stroke in the material in mm. | ||
*K is usally 0.05 | *K is usally 0.05 | ||
*K is maximum of 0.2 for rough finish in soft materials | *K is maximum of 0.2 for rough finish in soft materials | ||
| Line 60: | Line 60: | ||
*K should be 0.025 for high finish (almost glossy) DON'T use a lower K! | *K should be 0.025 for high finish (almost glossy) DON'T use a lower K! | ||
*K defines how fine the cut should be | *K defines how fine the cut should be | ||
*A typical Feed-rate could be 300 | *A typical Feed-rate could be 300 mm/min | ||
==Plunge-rate [mm/minute]== | ==Plunge-rate [mm/minute]== | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
| Små | | Små frässtål (3 - 5 mm) | ||
| Plunge-rate = 20% av Feed-rate | | 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 | |||
|} | |} | ||
*No more than 100 | *No more than 100 mm/min | ||
Revision as of 23:12, 10 September 2013
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]
- RPM = M / Tooldiameter
| 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 |
- No more than 100 mm/min
