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MEASUREMENT OF ROLLER CHAIN USING FORM GAUGE

SOLUTION

  • The solution to this problem is using a form gauge.
  • Form gauge made up of medium carbon steel.
  • This method involves usage of simple form gauge which is designed in the manner to check the parallelism and eccentricity.

INSPECTION METHOD

Pro-E DESIGN

  • The company inspected the chain parts they manufacture by using vernier caliper and vernier height gauge.

  • The main disadvantage of this inspection method is it's time consumption.

  • Thus the company requires a solution to minimize the time consumption for inspection.

Contd..

DEFINITIONS

The form gauge is made to fit in the chain link.

NOGO SIDE:

If the gauge does not go inside the chain link ,then the pin is parallely aligned and also no eccentricity. Because this is made up of same dimension.

GO SIDE:

If the gauge goes inside the chain link ,then the pin is not parallely aligned and also eccentricity.Because this is made up of larger than the no go side.

PARALLELISM:

When the axis of two pins under inspection are parallel to each other, it is known as parallelism between pins.

ECCENTRICITY:

When the pins center gets offset then the original shape of the pin gets changed. This is known as eccentricity.

ASSEMBLING PROCEDURE

  • The pin is press fitted to two outer link plates,
  • While the bush is press fitted to inner link plates,
  • The bush and the pin form a swivel joint and the outer link is free to swivel with respect to the inner link.

Contd..

  • The rollers are freely fitted on bushes.
  • The inner and outer link plates are blanked from cold rolled sheets and hardened to 50 HRC.
  • The pin,bushes and rollers are made of case carburizing alloy steels and hardened to 50 HRC.

CHAIN

A chain can be defined as a series of links connected by pin joint.

COMPANY

RENOLDS CHAIN INDIA PVT LTD-KARUR

PROBLEM

  • The company manufactures chains for Escalators.
  • The problem is to fabricate an instrument to check the parallelism and eccentricity between the pins.

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