screw..

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                             LAB REPORT:                      

GROUP DESIGN PROJECT

DESIGN AND MANUFACTURE OF A SCREW JACK

                                                           Introduction :

                                                        A screw jack is a type of jack that is operated by turning a lead screw.

                                                        It is used to lift a car or heavy vehicles, it is based on a principle similar

                                                        to that of an inclined plane.

                                  Objective:

The objective of this project is to design and building model of a mechanical

Screw jack, so that uniform motion among various parts is possible.

Design specifications & constraints:

·      This screw jack can carry and lift a load of 5kg

·      Weight of the screw jack is 1kg.

·      The demand of all screw jack parts is on the rise owing to the growth of industries.

·      Load capacity is limited by physical constraints.

·      Limited by maximum operating temperature i-e (200 *F).

·      Maximum speed to be limited to 80%.

·      The safety factor for this screw jack is 3-4

                               Design Analysis:

                                                               Screw jack consist of following parts :

a.  Nut

b.  Screw

c.   Cup

d.  Handle

e.  Washer

                            Design of screw:

Die=22mm

Core die =17mm

P=5

Mean die =19.5

Helix angle =5.66

Friction angle = 10.20

Buckling of screw:

Area is 220.6mm^2

Critical load is .91N

Design of Nut:

H=.25mm

Stress=0.908N/mm^2

     Design of frame:

D=39mm

Thickness=132mm

3D Models with Detail drawings :

                                                NUT:

 

                                                               

                                         BODY :

                                                                               

                               SCREW JACK:

                                                                               

                                            ROD:

                                                                       

                              

                                FINAL PART:

                                                                                                   

 

 

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