Общий каталог Tungaloy 2020 - 2021 - страница 1258

Regrinding holder

1 Clamping

- Assemble the drill head on the regrinding holder or shortest standard holder (3xD) - Set-up the drill head in the machine : Total run-out must be less than 0.02 mm

2 Grinding the 1st clearance angle

- Set the drill for point angle (140°) and 1st clearance angle (8°)

DAT DAT

3 Grinding the 2nd clearance angle

- Set the drill for 2nd clearance angle (15°)

20˚ 8˚

DAT DAT

20˚ 15˚

4 Grinding the chisel (Thinning)

- Set the drill for thinning angle (35°) with reference to drill axis and angle (30°) with reference to radial axis - Keep the chisel thickness (0.14 - 0.20) and the thinning point must be over the center line

30˚

35˚ 0.14 - 0.20 mm

5 Edge preparation (Honing)

- Cutting edges should have honing by sand or brush (0.04 - 0.06 mm) - You can also use a diamond hand lapper for edge preparation

A-A R = 0.04 - 0.06 mm DAT A A