Research Article
Precise Hole Drilling in PMMA Using 1064 nm Diode Laser CNC Machine
Table 2
The different experimental values of and at different working conditions.
| | Power (W) | Focal position | Taper ratio | Taper exposure time (s) | Aspect ratio | Aspect exposure time (s) | Assist gas pressure (mmHg) |
| | 2.45 | At surface | 1 | 2.75 | 20.8 | 2.75 | 20 | | = | = | 1 | 2.5 | 16.6 | 2.5 | 30 | | = | = | 1 | 2.5 | 20.8 | 1.75 | 40 | | = | = | 0.9 | 3 | 22.2 | 0.75 | 50 | | = | = | 0.9 | 0.75 | 22.7 | 0.75 | 60 | | = | At mid surface | 1 | 1.75 | 16.6 | 1.5 | 20 | | = | = | 0.8 | 1.75 | 3.7 | 1.25 | 30 | | = | = | 1 | 1.25 | 17.8 | 1.25 | 40 | | = | = | 0.9 | 3.5 | 4 | 3.5 | 50 | | = | = | 0.9 | 3.75 | 7.8 | 3.5 | 60 | | = | At lower surface | 0.43 | 1.75 | 4.3 | 1.75 | 20 | | = | = | 0.54 | 3.75 | 4.5 | 3.75 | 30 | | = | = | 0.6 | 4 | 4.5 | 3.75 | 40 | | = | = | 0.37 | 1.5 | 4.5 | 4 | 50 | | = | = | 0.4 | 4 | 4.4 | 0.75 | 60 | | = | = | 1 | 0.75 | 31 | 0.75 | 70 | | 2.45 | At surface | 0.48 | 3.75 | 3.3 | 2 | Non | | = | At mid surface | 0.5 | 3.5 | 4 | 2 | = | | = | At lower surface | 0.6 | 3.75 | 3.5 | 2 | = | | 1.82 | At surface | 0.5 | 3.75 | 3.5 | 2.5 | = | | 0.96 | At surface | 0.56 | 3.25 | 5 | 2.5 | = |
|
|
