1. Nachi Precision Private Limited Welcomes you …….

2. Technical Inputs on Metal Cutting -Band Sawing

3. 1. Types of Band Saw machines 2. Band Saw nomenclature
CONTENTS
1. Types of Band Saw machines
2. Band Saw nomenclature
3. Band Saw Selection
4. Band Saw Cutting Condition
5. Band Saw Testing Report
6. Trouble shooting.

4. TYPES OF BAND SAW MACHINE & APPLICATION
HORZONTAL；１３２０Ｈ×１７２０w
VERTICAL；１２６０Ｈ×1560w×４０００
Construction Beam
TYPES OF WORK MATERIAL
Bearing Steel Bars
Tool & Dies

5. METAL BAND SAW MACHINES
Cut-Off Machine
Contour Machine
Hinge Type
2 Pole Vertical Down Type
Portable Machine

6. Tooth material ＆ B.M.Construction
刃部材質とﾊﾞｲﾒﾀﾙ構造
　Tooth　material　＆　B.M.Construction　
・Tooth material is made of Powder HSS or Super HSS.
・Body material is made of spring steels.
・Tooth and body are welded strongly by electronic beam welding.

7. PITCH WIDTH TOOTH Rake Angle Wedge Angle Cutting Face Gullet
各部の名称
　NOMENCLATURE
Rake Angle
Wedge　Angle
　Back　Angle
Cutting
Face
Gullet
Gullet　Depth
Thickness
Set Width
PITCH
WIDTH
BACK
TOOTH
BODY=SPRING STEEL

8. Ｔｏｏｔｈ ｆｏｒｍ Types of Tooth Form Tooth Form ● Regular Tooth Form
　Ｔｏｏｔｈ　ｆｏｒｍ　
Types of Tooth Form
Tooth Form
● Regular Tooth Form
　・Wide application of materials, like
Carbon Steels, Alloy Steels & FC
　・０°rake angle is suitable for small
diameter less than 50mm and thin plate.
　・4T, 4/6T & above (Fine Pitch Tooth)
● Hook Tooth Form
　・Hook tooth form has sharp teeth permits
good cutting performance.
　・Positive rake angle is suitable for
tough and non ferrous materials.
・3T, 3/4T & below (Coarse Pitch Tooth)
0 degree rake
Positive rake

9. 　ピッチ
　Ｔｏｏｔｈ　ｐｉｔｃｈ　
Tooth Pitch is defined as the number of teeth per inch (TPI)
Pitch Type
Pitch Pattern
● Constant Pitch
Constant pitch has uniform
tooth spacing.
- Use for solid material.
● Variable Pitch (VL)
Variable pitch has different
Variable pitch has 2 types of
pitch in one group.
Variable pitch produce less
noise and reduce vibration
1 INCHES
Constant Pitch
3 TPI
3 TPI
E.g. of 3TPI
25.4 ÷3TPI=8.46mm
Variable Pitch
2/3 TPI
1 GROUP
2 TPI
3 TPI

10. 　あさり形状
T y p e o f t o o t h s e t　
Tooth Set: The teeth are alternately protrude on the left and right of the band body.
It’s allow clearance of the blade back through the cut.
　Type of Tooth Set
Tooth Set Pattern
● Standard Tooth Set
　・Used in constant pitch.
　・3 teeth sequence – left, right & straight.
● Group Tooth Set
　・Used in variable pitch.
　・Multi-teeth sequence.
- Prefer for ferrous material
● Wave Tooth Set
　・Used in fine pitch tooth.
・Suitable for sheet metal, thin pipes.
3 Tooth Set
5 Tooth Set
7 Tooth Set
Wave Tooth Set

12. 　あさり形状
Cutting Performance　
Cutting Performance primarily depends on following factors
Machine Design and Quality
Work Material composition
Material size and shape
Guide spacing
Blade TPI selection
Blade sharpness / Tooth Profile
Blade speed and feed rate
Blade tension
Blade Vibration
Coolant Quality and Proportion

13. TPI Selection Standard
Band Saw Pitch Reference Table as below
Pitch too big -- cutting force increase in per tooth -- causes tooth break & bad finishing
Pitch too small -- chips stuck in groove of tooth -- causes breakage of band saw
Soft & elastic materials -- better to use slightly coarser pitch
Hard materials --better to use fine pitch W

16. NACHI Metal Band Saw Selection
Tough to cut
Easy to cut

18. Cutting Speed -- Movement speed of Band Saw in 1 min as m/min
Cutting Condition
Cutting Speed -- Movement speed of Band Saw in 1 min as m/min
based on the work materials to be cut
Cutting Rate -- Work piece area being cut in 1 min as cm2/min
Cutting area cm2
Cutting Rate cm2/min =
Cutting Time min
Cutting Speed m/min
Cutting Time　min
Cut Area　cm2

19. SWORD PERFORMANCE SAWING S45C Cutting Condition
・Material：Machine Structural　Ｓ４５Ｃ 　Φ３００
・Band Saw Size： SH　４５７０×３４×１．０７×２／３
・Machine　　 ： HA-４００
・Cutting Speed ： V＝５５ｍ/min　 　 　　　　
・Cutting Time ： １３分/min（Rate＝５４cｍ２/min）　
・Result　　　　： Total area of cut　ｃｍ２
SAWING S45C
（ｃｍ２）
AMADA
Bhaco

20. SWORD PERFORMANCE SAWING SKD11 Cutting Condition
・Material：Cold work tool steels　SKD11 　Φ200
・Band Saw Size： SH　４５７０×３４×１．０７×２／３
・Machine　　 ： HA-４００
・Cutting Speed ： V＝40ｍ/min　 　 　　　　
・Cutting Time ： 分/min（Rate＝22 cｍ２/min）　
・Result　　　　： Total area of cut　ｃｍ２
SAWING SKD11
（ｃｍ２）
MARATHON
M42
SANVIK

23. TIPS FOR OPTIMUM PERFOMANCE
1. Breaking-in or running-in of a new blade is important.
2. Avoid starting a new blade in an existing cut.
3. Apply correct tension.
4. Observe chip formation. Fine, powdery chips mean insufficient feed pressure. Coarse, heavy burned chips mean excessive feed pressure.
5. Ensure proper clamping of work material.
6. Position guide arms as close to the work as possible.
7. Ensure correct position & condition of wire brush.
8. Use correct proportion of coolant.( 5 to 10 % oil )

24. MACHINE RELATED TIPS
Check Carbide guides, replace worn out guides.
Check Blade tracking, proper gap between blade back & band wheel flange to be maintain.
Check free movement of blade in guides. Maintain proper pressure of guides on blade.
Check coolant & hydraulic oil level.
Check oil & coolant leakages if any.
Clean oil filters periodically.
Check blade alignment with respect to vise & base.
Use ½ capacity of vise for optimum life.( Better beam strength )

25. THANK YOU !!!