Mega-Point Drill Grinder

 

Setup values for different drills points

 

 

 

 

Drill

A

B1

B2

C

D

E

G

Rem

4-facet drill point with point thinning (DIN 1412 A)

118

30

+ 6

7

40

6

5 R

1

6-facet drill point (DIN 1412 D for cast iron)

118/90

30

+ 6

7

40

10

15 R

 

4-facet drill point with point thinning and lip correction

(DIN 1412 D) for high carbon steel and brass hard

118

30

+ 6

5

40

12

15 R

2

TITER Plus, Guehring etc. with split point type OF

130

30

+ 5

8

65

2

10 L

3

4-facet parabolic point for deep hole drilling

with e.g. Guehring GT. 100 or Stock V 70

130

30

+ 5

7

40

6

5 R

4

4-facet left-hand drill point with split point

118 L

30

+ 4

5

130

8

40 L

 

flat bottom drill (180 tip angle)

150

+10

+ 10

3

40

12

20 R

5

4-facet spot drill

90

30

- 6

6

50

12

10 R

 

IFANGER boring tool for through-holes

118

30

30

5

60

6

25 L

 

three fluted right-hand core drill

(primary and secondary relief)

118

30

+ 6

--

--

--

--

 

three fluted solid carbide drill

140

22 ; + 6

5

50

0

20 L

6

Remarks

1. Point thinning of drills with dia. less than 3 mm / 1/8" requires a very sharp edge at the split point grinding wheel.

2. Point thinning as "4‑facet drill point with point thinning", then line up cutting edge parallel to split point grinding wheel and grind lip correction as needed.

 3. Radius on corner of split point grinding wheel according drill diameter.

 4. Use split point grinding wheel borazon 20 Item No. 600 575, 600 578 or 600 582.

 5. Align cutting edge parallel to single line on the viewing screen.

7. Use split point grinding wheel diamond Item No. 600 594. Align cutting edge for grinding about 1/2 line to deep and viewing screen.