Carbide Pilot Hole Correction Boring Bit
Brand :
MISUMI
Caution
Product Description
In case the hole pitch has an intersection or the inclination tolerance of the hole is demanding.
By using it before finishing the reamer, the bend of the hole can be modified.
Specifications
| Model Number | Flute Diameter D 0.1 mm Increment Designation | Recess Length ℓ 1 mm Increment Designation | Overall Length L | Shank Diameter d | |
| No. | |||||
| BRB | 3 | 1.8 ~ 2.0 | 6 ~ 10 | 40 | 3 |
| 4 | 1.8 ~ 2.4 | 6 ~ 10 | 50 | 4 | |
| 2.5 ~ 3.5 | 10 ~ 15 | ||||
| 6 | 2.5 ~ 3.0 | 10 ~ 15 | 60 | 6 | |
| 3.1 ~ 5.0 | 10 ~ 20 |
More Information
● When there is tolerance on the hole pitch, or when the allowable margin of error in the hole inclination is very limited, the use of this product before finishing with a reamer allows the hole skew to be corrected.
■Reference examples of machining process
(when positional accuracy, diameter precision, or surface roughness are required)
| Finished Diameter | Diameter of Pilot Hole (drill diameter) | Diameter of Pilot Hole (bit diameter) | Spiral Reamer | Pentagonal, Hexagonal Reamer |
| Ø 2.0 | Ø 1.7 | Ø 1.8 | Ø 1.98 | Ø 2.00 |
| Ø 2.5 | Ø 2.2 | Ø 2.3 | Ø 2.48 | Ø 2.50 |
| Ø 3.0 | Ø 2.7 | Ø 2.8 | Ø 2.98 | Ø 3.00 |
| Ø 3.5 | Ø 3.2 | Ø 3.3 | Ø 3.48 | Ø 3.50 |
| Ø 4.0 | Ø 3.7 | Ø 3.8 | Ø 3.98 | Ø 4.00 |
| Ø 4.5 | Ø 4.2 | Ø 4.3 | Ø 4.48 | Ø 4.50 |
| Ø 5.0 | Ø 4.7 | Ø 4.8 | Ø 4.98 | Ø 5.00 |
■ Cutting Conditions
| Bit Diameter | Feed Rate F (mm/min) | Revolution Speed (min-1) |
| Ø 1.8 | 22 | 3,700 |
| Ø 2.3 | 25 | 3,400 |
| Ø 2.8 | 27 | 3,100 |
| Ø 3.3 | 28 | 2,900 |
| Ø 3.8 | 30 | 2,700 |
| Ø 4.3 | 31 | 2,500 |
| Ø 4.8 | 32 | 2,300 |