17 (A) - SILENT CUTTER MACHINE

SILENT CUTTER MACHINE

Aim: To mix minced fish meat with various additives and measure the power transmission elements of a silent cutter machine.

Apparatus:
  1. Minced meat.
  2. Measuring scale
  3. Outside and inside caliper
  4. Tachometer
  5. Thread (Nylon)
Working principle: The silent cutter is used to mix the minced meat with various additives. In its working principle the power and motion from the electrical motor (i.e. driving shaft pulley) is transmitted to the driven shaft pulley by means of V belt. The driven pulley shaft rotates single grooved pulley and a cutter fixed at the end of the shaft. When single grooved pulley rotates on the driven pulley shaft, it rotates another grooved pulley by means of single V belt. This grooved pulley has a horizontal worm shaft to rotate vertical worm wheel shaft. The vertical worm wheel shaft rotates the bowl fixed on it. So both the bowl and cutter rotates simultaneously with different speeds.

Procedure:
  • Put the picked meat and additives into the bowl provided.
  • Switch on the electrical motor.
  • Collect the minced meat after some time.
  • Switch off the machine.
  • Clean the bowl, cutter blades with detergent and water.
Observations: Following observations have to be recorded.

Sl.No. Parameters
1. Horse power of the electrical motor (HP/KW)
2. RPM of the electrical motor (rpm)
3. RPM of the driver pulley (rpm)
4. Diameter of the driver pulley (cm)
5. Diameter of the driven pulley (cm)
6. Diameter of the smaller grooved pulley (cm)
7. Diameter of the bigger grooved pulley (cm)
8. Centre distance between the pulleys
9. Type of belt drive system used
10. No. of teeth on worm wheel
11 No. of threads on worm shaft
12 Type of belt used
13 Type of gear used
14 No. of blades
15 No. of belt used (No.)
16 Diameter of the bowl(cm)

Calculations:

1) Velocity ratio of belt drive

N2
= ------------
N1
d1
= ------------
d2
Where,
N1 = Speed of the driver in rpm
N2 = Speed of the driven in rpm
d1 = Diameter of the driver in cm
d2 = Diameter of the driven in cm

2) Length of the belt
(r1 – r2)2
L = (r1 + r2) + 2x + ------------
x

Where,
r1 = radius of the driver pulley in cms
r2 = radius of the driven pulley in cms
x = distance between the center of the pulley in cms

2 π NT
HP = ------------
4500

3) Diameter of the shaft

π
T = ------fsd3
16
Where,
Fs = Shear stress in Kg/ cm2
T = Torque in Kg-m
N = rpm
HP = Horse power
d = Diameter of driver shaft in cms

Last modified: Monday, 9 August 2010, 7:22 AM