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1.A Case Study On Method study
2.Recoating buffing wheels with emery
In large factories where heavy polishing and buffing operations are required, it is customary to recoat buffing wheels with emery in the plant, thus keeping a supply of fresh wheels always available .
The circumference or face of the wheel is coated with glue and emery dust.
The first coat of glue is allowed to set approximately one-half hour before the second is applied.
In large factories where heavy polishing and buffing operations are required, it is customary to recoat buffing wheels with emery in the plant, thus keeping a supply of fresh wheels always available .
The circumference or face of the wheel is coated with glue and emery dust.
The first coat of glue is allowed to set approximately one-half hour before the second is applied.
3.Original Method
The circumference of the worn wheel was coated with glue and then rolled by hand through a shallow trough filled with emery dust , thus coating the wheel.
After the glue had dried, a second coat of glue and emery dust was applied in a similar manner.
The wheels were then hauled to a drying oven, and hung on racks in the oven until the glue was thoroughly dry.
The circumference of the worn wheel was coated with glue and then rolled by hand through a shallow trough filled with emery dust , thus coating the wheel.
After the glue had dried, a second coat of glue and emery dust was applied in a similar manner.
The wheels were then hauled to a drying oven, and hung on racks in the oven until the glue was thoroughly dry.
4.Question Arises?
Why coat the wheels by hand?
Why Handle the wheel so often?
Could the wheels be coated on the first floor instead of on second?
Why coat the wheels by hand?
Why Handle the wheel so often?
Could the wheels be coated on the first floor instead of on second?
5.Improved Method(proposed method)
A special coating machine was built, making it possible to apply the glue and emery to the wheel in one operation with much less time and effort than by the old method.
Because this machine was located on the first floor between the storage area and the drying oven , it was unnecessary to move the wheels to the second floor. Special truck racks were used instead of regular platform trucks eliminating much unnecessary handling of wheels. The coated wheels remained 0n the truck racks while in the drying oven.
A special coating machine was built, making it possible to apply the glue and emery to the wheel in one operation with much less time and effort than by the old method.
Because this machine was located on the first floor between the storage area and the drying oven , it was unnecessary to move the wheels to the second floor. Special truck racks were used instead of regular platform trucks eliminating much unnecessary handling of wheels. The coated wheels remained 0n the truck racks while in the drying oven.
6.Coating Machine…
The wheel A to be coated is mounted on shaft B which is attached to lever C.
Swinging the lever to right makes contacts with glue coil D.
Lever C then swing to left , making contact with roll E which coats wheel with emery.
Rolls D and E are both power driven.
The Lever at F controls the amount of emery dust fed onto roll E
The wheel A to be coated is mounted on shaft B which is attached to lever C.
Swinging the lever to right makes contacts with glue coil D.
Lever C then swing to left , making contact with roll E which coats wheel with emery.
Rolls D and E are both power driven.
The Lever at F controls the amount of emery dust fed onto roll E
7.Special Truck Rack …
8. Result…
The new coating machine, the special truck rack for handling wheels, and the better location of the coating machine reduced the number of:
operations from 11 to 4
delays from 4 to 1
Transportation from 7 to 3
length of travel from 240 to 70 feet
average production from 20 to 45 wheels/hour
The new coating machine, the special truck rack for handling wheels, and the better location of the coating machine reduced the number of:
operations from 11 to 4
delays from 4 to 1
Transportation from 7 to 3
length of travel from 240 to 70 feet
average production from 20 to 45 wheels/hour
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