Table 4.
Effect of varying feed and spindle speed on the incurred delamination and uncut fibers damage during drilling process in fabricated composite specimens.
| Test | Drill bit diameter (mm) |
Feed (mm min− 1) |
Spindle speed (rpm) |
Hole entrance | Hole exit | ||
|---|---|---|---|---|---|---|---|
| Fed | Fu | Fed | Fu | ||||
| 1 | 7 | 50 | 1500 | 1.15 | 5.666 | 1.262 | 24.076 |
| 2 | 7 | 1000 | 1500 | 1.168 | 20.791 | 1.267 | 31.146 |
| 3 | 7 | 2000 | 1500 | 1.26 | 49.276 | 1.27 | 62.151 |
| 4 | 7 | 1000 | 500 | 1.385 | 61.197 | 1.489 | 38.076 |
| 5 | 7 | 1000 | 1500 | 1.258 | 49.792 | 1.367 | 31.146 |
| 6 | 7 | 1000 | 3000 | 1.159 | 34.8 | 1.307 | 29.592 |
| 7 | 10.1 | 50 | 1500 | 1.056 | 1.281 | 1.136 | 4.183 |
| 8 | 10.1 | 1000 | 1500 | 1.167 | 56.738 | 1.161 | 22.486 |
| 9 | 10.1 | 2000 | 1500 | 1.242 | 70.771 | 1.196 | 29.099 |
| 10 | 10.1 | 1000 | 500 | 1.321 | 63.142 | 1.261 | 14.107 |
| 11 | 10.1 | 1000 | 1500 | 1.237 | 56.738 | 1.241 | 12.183 |
| 12 | 10.1 | 1000 | 3000 | 1.166 | 27.83 | 1.231 | 9.349 |