GOJ Verktøy AS
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Technical Information

 

 

Tooth types

To obtain optimum cutting rates, toothing and tooth types are of great significance. We offer four tooth types to solve your cutting problem.

Normal or standard tooth (N)

With a rake angle of 0°, this tooth type is particularly suited for cutting short chipping, low alloyed materials, solids in small and medium cross sections as well as tubes and profiles.
 

Hook tooth (K)

With a positive rake angle of 10°, the hook tooth has a large, long-drawn-out chip space. Therefore, it is mostly used for cutting non-ferrous metals, steels of all kinds, Cr-Ni alloys, and primarily bigger cross sections.
 

Special toothing (Plus)

This tooth type features varied toothings and an extremely positive rake angle of 16°, which results in aggressive cutting behaviour of the band saw blade. Therefore, it is well suited for cutting stainless and acid resisting steels.
 

Novum tooth

This tooth type has ground tooth tips with a chamfered, non-set precutter and two set finishing cutters and is manufactured with a positive rake angle of 10° or 16°. Its particular tooth geometry allows economic cutting of high and highest alloyed steels with bimetal band saw blades.
 

 


Toothing

Standard toothing with regular pitches

Standard toothing is characterized by the same space between the individual teeth. It is particularly well suited for low alloyed materials of solids in small and medium cross sections as well as thin walled tubes and profiles.
 

Combi toothing

Combi toothing has varying spaces between the tooth tips within a group of teeth. This allows cutting larger cross sections with the same blade and reduces virbrations in lengthwise and transverse direction.
 

 


Tooth Settings

The tooth setting of the band saw blade is necessary to achieve free cutting of the blade during the cutting process. The individual teeth are set out of the band saw blade level to the right and left, forming a cutting channel wider than the thickness of the band saw blade to avoid blade binding.

We offer the following tooth settings for various applications:

Standard set

The individual teeth are set in right-left-straight sequence. This tooth setting is often used in combination with standard toothing but also in combination with Novum or Plus toothing.
 

Right left set

This tooth setting is particularly efficient with easy to cut materials such as non-ferrous metals, plastics and wood.
 

Wave set

The set sequence is waved.
 

Group set

Two teeth set to the right are followed by two teeth set to the left while one tooth remains straight. This tooth setting was developed for low vibration cutting of thin material cross sections, such as tubes and profiles.
 

Combi set

With the set sequence of this tooth setting, several teeth in a row are set to either the right or the while only few teeth (e.g. each 5th, 7th or 9th tooth) remain straight. Thus, this setting has more cutting tooth edges and less chipremoving tooth tips. The combi toothing reduces vibrations, which otherwise occur when cutting with unvarying tooth spaces. We deliver the combi tooth with a positive rake angle of 10° for solids in larger cross sections and with a rake angle of 0° for smaller cross sections, profiles and bundle cutting.
 

 


Cutting speed and feed rate

These two components determine the cutting rate provided in cm²/min.

The cutting speed

(band speed) depends on tensile strength, type and cross section of the material to be cut. For higher tensile strength you have to choose a lower cutting speed. Smaller cross sections can be cut with a higher cutting speed than larger cross sections.

The feed

(cutting pressure) depends on the cross section of the material. For larger material cross sections you need a high cutting pressure. Thin-walled tubes and profiles as well as sharp edges are cut with low pressure and if possible with constant feed.

The following table shows cutting rates as a function of the material to be cut.

Material
 
 

Cutting speed in m/min

Cutting rate in cm²/min for dimensions of (mm)

25ø

50ø

75ø

100ø

150ø

200ø

Construction steel machining steel

80 - 90

25-35

40-50

50-60

55-70

70-90

75-85

Case hardened steels steels for hardening and tempering

45 - 75

20-25

25-35

30-40

35-50

40-60

40-50

Non-alloyed tool steels roller bearing steels

40 - 60

20-25

25-35

30-35

30-40

40-50

40-50

Alloyed tool steels 
high speed steels

30 - 40

15-20

20-25

25-30

30-35

30-35

30-35

stainless steels*

20 - 35

10-15

15-20

15-20

15-20

15-20

15-20

Heat-resistant steels* high temperature alloys steels*

15 - 25

5-10

5-10

7-13

5-15

5-15

5-15

 

* For these qualities we recommend our band saw blades Novum and Plus with their specific tooth types.

 


Break-in procedures

To obtain full service life we recommend that you break in the band saw blade in a controlled way. Determine the correct cuttingspeed and feed (see above) as a function of the dimension of the material to be cut. 

Start with 70% of the regular cutting speed and 50% of the regular feed rate. After cutting 400-600 cm² (approx. 20 x 30 cm or 15 X 40 cm), increase the feed rate slowly to the rate previously determined.

 


Safety instructions

For your own safety, please follow the safety instructions while you are working with JUNIOR metal band saw blades:

  • Always wear safety glasses and gloves when unpacking and installing the band saw blades.
  • Turn off the machine at the main switch when performing repairs.
  • Follow the safety instructions of the manufacturer.

 


Toothing recommendation

Solid materials

Combi toothing increases the area of application and reduces vibrations.

Bimetal band saw blades

HM-Power band saw blades

standard toothing

combi toothing

combi toothing

Material cross
section

toothing
 

Material cross section

toothing
 

Material cross section

toothing
 

to 10 mm

14 tpi

to 25 mm

10/14 tpi

50 - 120 mm

3/4 tpi

10 - 30 mm

10 tpi

15 - 40 mm

8/12 tpi

100 - 250 mm

2/3 tpi

30 - 50 mm

8 tpi

25 - 50 mm

6/10 tpi

150 - 400 mm

1,5/2 tpi

50 - 80 mm

6 tpi

35 - 70 mm

5/8 tpi

> 350 mm

0,75/1,25 tpi

80 - 120 mm

4 tpi

40 - 90 mm

5/6 tpi

 

 

120 - 200 mm

3 tpi

50 - 120 mm

4/6 o. 4/5 tpi

 

 

200 - 400 mm

2 tpi

80 - 180 mm

3/4 o. 4/5 tpi

 

 

300 - 700 mm

1,25 tpi

130 - 350 mm

2/3 tpi

 

 

>600 mm

0,75 tpi

150 - 450 mm

1,5/2 tpi

 

 

 

 

200 - 600 mm

1,1/1,6 tpi

 

 

 

 

>500 mm

0,75/1,25 tpi

 

 

Tubes

With thin tubes (up to a wall thickness of approx. 8 mm), use toothing with 0° rake angle if possibile.

Wall thickness in mm

Outside diameter of tube in mm

Toothing in tpi

 

20

40

60

80

100

120

150

200

300

500

2

14

10/14

10/14

10/14

10/14

8/12

8/12

8/12

8/12

5/8

3

14

10/14

10/14

8/12

8/12

8/12

8/12

6/10

6/10

5/8

4

10/14

10/14

8/12

8/12

8/12

6/10

6/10

5/8

5/8

4/6

5

10/14

10/14

8/12

8/12

6/10

6/10

5/8

4/6

4/6

4/6

6

10/14

8/12

8/12

6/10

6/10

5/8

5/8

4/6

4/6

4/6

8

10/14

8/12

8/12

6/10

5/8

5/8

4/6

4/6

4/6

4/6

10

-

8/12

6/10

5/8

4/6

4/6

4/6

4/6

4/6

4/5

12

-

8/12

6/10

4/6

4/6

4/6

4/6

4/6

4/6

4/5

15

-

8/12

6/10

4/6

4/6

4/6

4/6

4/5

4/5

4/5

20

-

-

4/6

4/6

4/6

4/6

4/5

4/5

4/5

3/4

30

-

-

-

4/6

4/6

4/5

4/5

4/5

4/5

2/3

50

-

-

-

-

-

-

4/5

3/4

2/3

2/3

80

-

-

-

-

-

-

-

3/4

2/3

2/3

>100

-

-

-

-

-

-

-

-

2/3

1,5/2

 
      Utviklet av IDESIGN AS