Week 4:- Pin Unit Design Challenge

FIXED PIN UNIT:

An assembly of standard and manufacturing parts consisting location pin is called Pin unit. A pin unit in which pin’s position is fix, is called Fixed Pin Unit. Pin unit is used to lock the rotational position of panel. 

Round Pin is  used to control panel in two directions while Diamond Pin is used to control panel in one direction.

AIM: To design two types of Fixed pin unit for arresting 5 Degree of Freedom. (3 rotation, 2 translation)

FIXED PIN UNIT TYPE-I:

• Round type pin is used for guiding hole.
• 2 seperate shim packs of 5mm thickness which is having 5 shims of 1mm each is used.
• 3 holes i.e. 2 dowel holes and 1 screwing hole are used for fixing each part to one another.
• In dowel holes clevis pin with head and without slot is used. It is having tight fit onto the part in which head side is present.    

FIXED PIN UNIT TYPE-II:

• Diamond type pin is used for guiding hole.
• 2 seperate shim packs of 5mm thickness which is having 5 shims of 1mm each is used.
• 4 holes i.e. 2 dowel holes and 2 screwing hole are used for fixing each part to one another.
• In dowel holes clevis pin with head and without slot is used. It is having tight fit onto the part in which head side is present. 

RETRACTABLE PIN UNIT:

Retractable Pin unit consist one Pin cylinder which operates the pin in one direction. In this unit Pin is directly mounted on the cylinder and it is must to have pin and cylinder inline with the hole or slot of the panel.

AIM: To design two types of Retractable pin unit for arresting 5 Degree of Freedom. (3 rotation, 2 translation)

RETRACTABLE PIN UNIT TYPE-I: 

• Round type pin is used for guiding hole and it sits on the retractable cylinder.
• Pin is constraint onto the cylinder using threaded tail which mate with the counterbore present in the cylinder top. 
• 6 holes i.e. 4 dowel holes and 2 screwing hole are used for fixing blade to cylinder body. (holes present by default on cylinder side)
• 4 holes i.e. 2 dowel holes and 2 screwing hole are used for fixing each part to one another.
• In dowel holes taper pin of size 8mm diameter on one side and more than 8mm diameter on another side is used. This taper pin is inserted forcefully in 4 dowel holes of blades and 2 dowel holes of riser

RETRACTABLE PIN UNIT TYPE-II: 

• Diamond type pin is used for guiding hole and it sits on the retractable cylinder.
• Pin is constraint onto the cylinder using two pins crossing through cylinder top and pin. 
• 6 holes i.e. 4 dowel holes and 2 screwing hole are used for fixing blade to cylinder body. (holes present by default on cylinder side)
• 3 holes i.e. 2 dowel holes and 2 screwing hole are used for fixing each part to one another.
• In dowel holes taper pin of size 8mm diameter on one side and more than 8mm diameter on another side is used. This taper pin is inserted forcefully in 4 dowel holes of blades and 2 dowel holes of riser