Nitto QA-4000, Instruction Manual, Page: 17 / 24

8-9 Hi-broach tool angles
For broach diameters of 14 to 25mm, the Hibroach
One-touch Type blade shapes are no different from the
conventional Hibroach Side Lock Type. But from 26 to
35mm diameters the blade shapes are different.
(Fig.41, Fig.42)
Note the difference between blade shapes when re-
grinding.
(Fig. 41)
(Fig. 42)
8-6 Loosening a tight Pilot Pin
When the cutter needs to be replaced, pull out and
change the Pilot Pin which acts as a guide. However, if
metal chips are caught between the cutter and the pin,
the pin may be difficult to be pulled out. Tap the end of
the pin gently with a wooden mallet as you pull it out.
(Fig. 39)
(Fig. 39)
8-7 Cutter grinding
When the cutter needs re-grinding, consult the sales
agent from whom you purchased the tool or an authorized
dealer.
8-8 Jetbroach tool angles
Jetbroach tool angles are as shown in the figure.
(Fig. 40)
(Fig. 40)
16
Edge
Pilot Pin
Slags
Inside of inner cutting tip
Inner cutting tip
Outside of inner
cutting tip
Inside of outer cutting tip
Outside of
outer cutting tip
Outer cutting tip
Outer cutting tip
Inner cutting tip
Hibroach tool angles ( φ 14 〜φ 25)
Hibroach tool angles ( φ 26 〜φ 35)
12゜
25゜
28゜
12゜
12゜
t
Outside
Inside
Outside
Inside
1/2t 〜 1/3t
A
B
2.3(
φ
17.5 〜φ 25(mm))
2.8(
φ
26 〜φ 65(mm))
20 ° 20 °
5 °
5 °
1.1
20 °
20 °
5 °
5 °
0.3
Outer cutting tip
Inner cutting tip
3.7(
φ
26(mm))
3.9( φ 26 . 5(mm)
3.2(
φ
27 〜φ 35(mm)
25 °
20 °
12 °
12 °
1.1
25 °
20 °
12 °
12 °
0.55
Outer cutting tip
Outer cutting tip
Inner cutting tip
Inside of inner cutting tip
Inside of outer
cutting tip
Inner cutting tip
Outside of
outer cutting tip
Outer cutting tip
Inside of outer cutting tip
Inner cutting tip
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