TYPES OF SIMPLE MACHINE

PRSENTED BY

MR. NIKAM VILAS NAVNATH

LECTURER,M.I.T. DHANORE

E-mail-vilas5151@gmail.com

TYPS OF SIMPLE MACHINES

• SIMPLE WHEEL & AXLE• DIFFERAINTIAL AXLE & WHEEL• WESTON’S DIFFERAITIAL PULLY BLOCK• SINGLE PURCHASE CRAB• DOUBLE PURCHASE CRAB• WORM & WORM WHEEL• GEARED PULLY BLOCK• SCREW JACK

I. SIMPLE WHEEL & AXLE

V.R= D/d D=DIAMETER OF EFFORT WHEEL

d= DIAMETER OF LAOD AXLE

II. DIFFERAINTIAL AXLE & WHEEL

V.R= 2D/(d1-d2)D =DIAMETER OF EFFORT WHEEL

d1= DIAMETER OF OF BIGGER AXLE

d2= DIAMETER OF OF SMALLER AXLE

III. WESTON’S DIFFERAITIAL PULLY BLOCK

1) IF NUMBER OF COGS OR TEETH ARE GIVEN

V.R= 2T1/(T1-T2)T1=NUMBER OF COGS OR TEETH ON BIGGER PULLY

T2= NUMBER OF COGS OR TEETH ON SMALLER PULLY2) IF D=DIAMETER OF BIGGER & d=DIAMETER OF SMALLER PULLY IS GIVEN

V.R= 2D/(D-d)

IV. SINGLE PURCHASE CRAB

V.R.= D/d×T1/T2D= DIAMETER OF EFFORT WHEEL.d= DIAMETER OF LAOD DRUM.

T1=NUMBER OF TEETH ON SPUR OR MAIN GEAR.

T2= NUMBER OF TEETH ON PINION.IF EFFORT HANDLE LENGTH ‘L’ IS PROVIDED INSTEAD OF EFFORT WHEEL.

V.R.= 2L/d×T1/T2

V. DOUBLE PURCHASE CRAB

V.R.= D/d×T1/T2× T3/T4D= DIAMETER OF EFFORT WHEEL.d= DIAMETER OF LAOD DRUM/LAOD AXLE.

T1=NUMBER OF TEETH ON SPUR ‘A’

T2= NUMBER OF TEETH ON PINION ‘B’ MOUNTED ON INTERMEDIATE SHAFT.

T3= NUMBER OF TEETH ON SPUR ‘C’ MOUNTED ON INTERMEDIATE SHAFT.

T4= NUMBER OF TEETH ON PINION ‘D’ MOUNTED ON EFFORT WHEEL.IF HANDLE OF LENGTH ‘L’ IS GIVEN,

V.R= 2L/d×T1/T2× T3/T4L=LENGTH OF HANDLE.

VI. WORM & WORM WHEEL

1. IF EFFORT WHEEL IS PROVIDED

V.R. =RT/rR=RADIUS OF EFFORT WHEEL.T=NUMBER OF TEETH ON WORM WHEEL.r= RADIUS OF LOAD DRUM. 2. IF HANDLE IS USED IN PLACE OFEFFORT WHEEL IS PROVIDED.

V.R. =LT/rL=LENGTH OF HANDLE.2. IF WORM IS ‘n’ THREADED.

V.R. =RT/nr or =LT/nrn=NUMBER OF THREAD ON WORM.

VII. GEARED PULLY BLOCK

V.R.= T1/T2× T3/T4D= DIAMETER OF EFFORT WHEEL.d= DIAMETER OF LAOD WHEEL.

T1=NUMBER OF CAGS ON EFFORT WHEEL ‘A’

T2= NUMBER OF CAGS ON PINION WHEEL ‘B’.

T3= NUMBER OF TEETH ON SPUR WHEEL OR MAIN GEAR ‘D’

T4= NUMBER OF CAGS ON THE LOAD WHEEL ‘C’IF DIAMETER OF EFFORT WHEEL ‘A’ &LOAD WHEEL ‘C’ IS GIVEN

V.R= D/d× T2/T3D=DIAMETER OF EFFORT WHEEL ‘A’d= DIAMETER OF LAOD WHEEL ‘C’

T3= NUMBER OF TEETH ON SPUR WHEEL ‘B’

T2= NUMBER OF TEETH ON PINION WHEEL ‘D’.

VIII. SCREW JACK

V.R.= 2 π L/pL=LENGTH OF EFFORT HANDLE LEVER ARM.p= PITCH OF THREAD OR PITCH OF SCERW

V.R= π D/pD=DIAMETER OF EFFORT WHEELp= PITCH OF THREAD OR PITCH OF SCERW