Hafco Metalmaster BS-321AS, Instruction Manual

5

This machine is equipped with automatic power 
shut-off safety device to prevent any further 
damage when a blade has been broken. There is 
a reduction in tension when an adjustment bolt 
actuates micro switch’s plunger.  To keep the 
micro switch in proper contact with the blade’s 
tension. An adjustment of the actuator bolt is 
required. 
 

3.7 Chip 

brush 

 
This model has a powered chip brush driven by 
an axle transfer from the drive motor.  The chip 
brush is designed to clean the blade thus 
prolonging the life of the blade. 
 

3.8 

Open Blade Cover Safety Device 

When blade cover is open, close the blade cover 
as instructed below: 
1.  Use one hand on the cover handle to hold 

the blade cover. 

2.  Use the other hand to push in the safety 

plate (Fig. A), so the bracket will release (Fig. 
B). 

3.  Lower the cover down slowly and carefully. 

3.9 

Speed change dial 

The speed change dial adjusts the variable speed 
transmission in blade speed.  Change only while 
blade is moving. 
This machine has a variable speed transmission 
using a variable pulley - system.  The speed is 
changed by rotating the speed changer dial to 
adjust the width of the pulley discs.  When 
compressed, the pulley discs cause the belt to 
ride the outer edge of pulley discs and changing 
the speed. The speed must be changed while belt 
is moving. 
 

3.10  Blade angle scale 

 
The scale indicates the cutting angle of the blade.   
The scale has preset stops at every 15



. 

3.11  Attached coolant device 

 
An attached coolant device that is screwed on the 
front vise jaw for supply enough coolant to the 
cutting material. This device can be unscrewed, 
and move to the rear vise jaw for easy both side 
miter cutting. 
 
 

4 

SET UP AND PRE-OPERATIONS 

4.1 

Adjusting the tungsten carbide guides 

The blade is guided by the upper ball bearings, 
side ball bearings, and tungsten carbide guides. 
 
 
 
 
 
 
 
 
 
 
 
 

Ball bearing

Ball bearing

Tungsten carbide guides 

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Instruction Manual for BS-321AS (B034A)

31/03/2016