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close this bookOperations on Band and Circular Sawing Machines - Course: Mechanical woodworking techniques. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 19 p.)
View the document(introduction...)
View the document1. Purpose of Circular Sawing Operations
View the document2. Assembly of a Table Circular Sawing Machine
View the document3. Tools
View the document4. Mode of Operation of a Circular Sawing Machine
Open this folder and view contents5. Circular Sawing Technology
View the document6. Purpose of Band Sawing Operations
View the document7. Assembly of a Band Sawing Machine
View the document8. Tools
View the document9. Mode of operation of a band sawing machine
Open this folder and view contents10. Band Sawing Technology

7. Assembly of a Band Sawing Machine


Figure 16 Assembly of a band sawing machine 1 adjustable saw blade sheathing, 2 hand wheel to chuck the saw blade, 3 saw blade, 4 machine table, 5 stop rule, 6 contact/or exhaust facility, 7 casing with lower saw band roll and motor, 8 stand

Stand:

The cast iron stand bears the upper and lower band roll, the machine table and the drive motor of the lower band roll.

Machine table:

The machine table is adjustably supported for undertaking angle cuts. The machine table features an adjustable and pivoted stop rule for parallel cuts.


Figure 17 Adjustability of facilities 1 shifting the stop rule, 2 chucking the saw blade, 3 shifting the saw blade sheathing. 4 tilting the machine table

Band rolls:

The lower band roll is firmly pivoted and driven by a motor.

The top band roll is positioned vertically above the lower band roll. It can be adjusted by means of a hand wheel for chucking the saw blade heightwise.

The shaft of the top band roll is inclined towards the running setting of the band saw blade.

The band rolls have rubber bandages for improved adhesive power of the saw blade.

Check that rubber bandages are clean and not damaged or worn!

Saw blade sheathing:

Both band rolls and the band saw blade section not required for cutting are sheathed. The adjustable saw blade sheathing can be set to the thickness of the material to be cut.

Saw blade guidance:

The top saw blade guidance above the table can be set heightwise to material thickness. The guidance positioned below the machine table is rigid. The saw blade guidance consists of lateral and back guide rolls which absorb the feed pressure of the workpiece.


Figure 18 Assembly of saw blade guidance 1 top saw blade guidance, 2 band saw blade, 3 machine table, 4 lower saw blade guidance, 5 lateral guide role, 6 rear guide rolls

The saw blade teeth must protrude beyond the guide rolls so that the saw blade slides easily through the guide rolls.

The band saw blade is properly set when the unstressed saw blade extends 2 mm plus tooth height above the lateral guide rolls and is then 1 mm away from the back guide roll.

Regulating the top saw blade guide should be possible without any danger whilst the machine is running!

Saw blade guides must guarantee smooth saw blade running. The saw blade sections not used for sawing should be sheathed until they are shortly beyond the workpiece surface.

The saw blade run of the machine table must not exceed 3 mm in width!

The correct setting of the guide rolls must be constantly checked!

Relieve the saw blade during longer machine standstill periods.

Why is the machine table adjustable?
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Why is the top band roll movably pivoted?
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Why do the band rolls have rubber bandages?
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How shall the saw blade guidance be set?
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What must be done during longer machine standstill periods?
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