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What is Whitworth quick return motion?

What is Whitworth quick return motion?

The Whitworth mechanism is also known as the quick-return mechanism. It represents a revolving crank slider and produces non-uniform stroke movement with slow forward movement and fast backward movement. This mechanism is used in tools, packaging and transport machinery.

Where is Whitworth quick return mechanism used?

5] The Whitworth quick return mechanism is generally used in shaper machines & slotting machine in which forward stroke is slower for machining purposes & return stroke is faster as there is no machining process is to be done.

What is quick return motion mechanism?

A quick return mechanism is an apparatus to produce a reciprocating motion in which the time taken for travel in return stroke is less than in the forward stroke. It is driven by a circular motion source (typically a motor of some sort) and uses a system of links with three turning pairs and a sliding pair.

What is the difference between Whitworth and quick return mechanism?

Whitworth Quick Return mechanism :- The difference between the crank and lever mechanism and Whitworth mechanism is that in whitworth mechanism the return stroke is faster than the forward stroke while in the crank and lever mechanism the forward stroke is of same speed as that of return stroke.

What are the types of quick return mechanism?

There are three types of Quick return mechanism:

  • Whitworth Quick Return mechanism.
  • Crank and Slotted Link Mechanism and.
  • Hydraulic Drive.

Why return stroke is faster in quick return mechanism?

As you can observe that the travel of crank in return stroke will be less compared to the forward stroke. Therefore the return stroke is faster than the cutting stroke. i.e. the forward stroke is making an angle β which is more than the return stroke α.

Is quick return mechanism is responsible for Ram movement?

Explanation: Due to the rotation motion of the disc, the ram moves forward and backwards. During half rotation, the ram moves forward whereas during the other half rotation. The ram quickly returns. Thus it converts rotary motion into reciprocating motion.

What is quick return ratio?

Ratio of time taken for forward stroke to that for return stroke is called Quick Return Ratio. This is also equal to the ratio of angle swept by crank in the corresponding strokes.

What purpose are the quick return mechanism used?

A quick return mechanism is an apparatus that converts circular motion into reciprocating motion in presses and shaping machines, which are utilized to shape stocks of metal into flat surfaces. This mechanism is mostly used in shaping machines, slotting machines and in rotary internal combustion engines.

Why return stroke is called ideal stroke?

The return stroke or ideal is faster than the forward stroke in this mechanism. A short link PR transmits the motion from AP to the ram which carries the tool and thus forward stroke and backward stroke is obtained.

How does the Whitworth quick return mechanism work?

Whitworth’s Quick Return Mechanism. Author. Description. The Whitworth quick return mechanism converts rotary motion into reciprocating motion, but unlike the crank and slider, the forward reciprocating motion is at a different rate than the backward stroke.

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