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Helical Milling Blind Holes, Flat Bottom Pitch (P)
DC Hole Diameter (DH) (inch)
| Helical Milling (Blind | Hole, Flat Bottom) | |||||
| Type | DC | RE | BS | 2 DH max. P max. | 3 DH min. | P max. |
| .031 | .079 | 2.417 .787 | 2.276 | .787 | ||
| .063 | .047 | 2.354 .748 | 2.276 | .748 | ||
| 1250" | .079 | .031 | 2.323 .709 | 2.276 | .748 | |
| . | .094 | .016 | 2.291 .709 | 2.276 | .748 | |
| .118 | .031 | 2.244 .669 | 2.193 | .669 | ||
| .125 | .024 | 2.228 .669 | 2.193 | .669 | ||
| .031 | .079 | 2.902 .787 | 2.776 | .787 | ||
| .063 | .047 | 2.839 .748 | 2.776 | .748 | ||
| " | .079 | .031 | 2.807 .709 | 2.776 | .748 | |
| 1.500 | .094 | .016 | 2.776 .709 | 2.776 | .748 | |
| .118 | .031 | 2.728 .669 | 2.693 | .669 | ||
| .125 | .024 | 2.713 .669 | 2.693 | .669 | ||
| .031 | .079 | 3.902 .787 | 3.768 | .787 | ||
| .063 | .047 | 3.839 .748 | 3.768 | .748 | ||
| " | .079 | .031 | 3.807 .709 | 3.768 | .748 | |
| 2.000 | .094 | .016 | 3.776 .709 | 3.768 | .748 | |
| .118 | .031 | 3.728 .669 | 3.768 | .669 | ||
| .125 | .024 | 3.713 .669 | 3.687 | .669 | ||
| A Type | .031 | .079 | 5.902 .787 | 5.768 | .787 | |
| .063 | .047 | 5.839 .748 | 5.768 | .748 | ||
| " | .079 | .031 | 5.807 .709 | 5.768 | .748 | |
| 3.000 | .094 | .016 | 5.776 .709 | 5.768 | .748 | |
| .118 | .031 | 5.728 .669 | 5.686 | .669 | ||
| .125 | .024 | 5.713 .669 | 5.686 | .669 | ||
| .031 | .079 | 7.902 .787 | 7.768 | .787 | ||
| .063 | .047 | 7.839 .748 | 7.768 | .748 | ||
| " | .079 | .031 | 7.807 .709 | 7.768 | .748 | |
| 4.000 | .094 | .016 | 7.776 .709 | 7.768 | .748 | |
| .118 | .031 | 7.728 .669 | 7.686 | .669 | ||
| .125 | .024 | 7.713 .669 | 7.686 | .669 | ||
| .031 | .079 | 9.902 .669 | 9.767 | .630 | ||
| .063 | .047 | 9.839 .630 | 9.767 | .630 | ||
| " | .079 | .031 | 9.807 .630 | 9.767 | .630 | |
| 5.000 | .094 | .016 | 9.776 .630 | 9.767 | .630 | |
| .118 | .031 | 9.728 .551 | 9.685 | .551 | ||
| .125 | .024 | 9.713 .551 | 9.685 | .551 | ||
| " | .157 | .035 | 2.165 .630 | 2.106 | .630 | |
| 1.250 | .197 | .016 | 2.087 .591 | 2.070 | .591 | |
| " | .157 | .035 | 2.650 .630 | 2.605 | .630 | |
| 1.500 | .197 | .016 | 2.571 .591 | 2.569 | .591 | |
| " | .157 | .035 | 3.650 .630 | 3.599 | .630 | |
| 2.000 | .197 | .016 | 3.571 .591 | 3.563 | .591 | |
| B Type | 157 | 035 | 5.650 .551 | 5.597 | .551 | |
| 3.000" | . .197 | . .016 | 5.571 .551 | 5.561 | .551 | |
| " | .157 | .035 | 7.650 .591 | 7.597 | .591 | |
| 4.000 | .197 | .016 | 7.571 .591 | 7.561 | .591 | |
| 157 | 035 | 9650 472 | 9597 | 472 | ||
| 5.000" | . .197 | . .016 | . . 9.571 .472 | . 9.560 | . .472 |
*1 L (Max. Depth of Cut =.591" / tan %). Cutters' moving distance until depth of cut reaches APMX at a maximum ramping angle.
Maximum depth of cut A type is .827", B type is .803".*
2 The maximum diameter when machining a blind hole with a flat face using a corner radius of .031" for A type and .157" for B type. Other than that, find with the below formula. {(cutting edge diameter DC)─ (corner radius)─ 0.3)}×2 *3 The minimum diameter when machining a blind hole with a flat face using a corner radius of .031" for A type and .157" for B type. Other than that, find with the below formula. {(cutting edge diameter DC)─ (corner radius)─ (Width of wiper edge BS)─ 0.1)}×2 Note 1) The recommended ramping feed is .002 IPT or under.