How does Whitworth quick return mechanism?

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. This mechanism is most commonly seen as the drive for a shaping machine.

What is the difference between Whitworth and quick return mechanism?

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

Where do we use quick return mechanism?

A quick return mechanism converts the circular motion into reciprocating motion (repetitive back and forth linear motion). This mechanism is mostly used in shaping, planning, and slotting machines.

Which of the following is quick return motion mechanism?

Explanation: In a quick return mechanism, the forward reciprocating motion is slower rate as compared to the backward stroke. That is why it is called a quick return mechanism.

What is quick return?

: a device used in a machine tool to cause the return stroke (as of a reciprocating tool) to be faster than the cutting stroke.

Which link is fixed in Whitworth quick return mechanism?

The crank OC is fixed and OQ rotates about O. Whitworth quick return motion mechanism: Third inversion is obtained by fixing the crank i.e. link 2. Whitworth quick return mechanism is an application of third inversion.

Why is a quick return mechanism needed?

Quick return is a common feature of tools in which the action is performed in only one direction of the stroke, such as shapers and powered saws, because it allows less time to be spent on returning the tool to its initial position.

What is the main advantage of a quick return mechanism?

Advantages of Quick Return Mechanism: The process is automated. The construction of the mechanism is not so complicated. It can perform operations like cutting, flattening and slotting the workpiece. The idle time is reduced because of the fast returning stroke.

Why return stroke is called ideal stroke?

As the slotted bar oscillate, the ram will move in forward and backward direction. 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.

Is fixed in Whitworth mechanism?

Whitworth quick return mechanism is an application of third inversion. This mechanism is shown in the figure below. The crank OC is fixed and OQ rotates about O. The slider slides in the slotted link and generates a circle of radius CP.

Is shaper a quick return mechanism?

A quick-return mechanism is a subclass of a slider-crank linkage, with an offset crank. Quick return is a common feature of tools in which the action is performed in only one direction of the stroke, such as shapers and powered saws, because it allows less time to be spent on returning the tool to its initial position.

What is quick return effect?

A quick return mechanism is an system to produce a resiprocating effect such that time taken by system in return stroke is less time taken by it in the forward stroke. This mechanism is used in many machines. Some of them are shaper machines, slotter machines, screw press, mechanical actuator etc.

When to use the Whitworth quick return mechanism?

This is simpler version of Whitworth Quick return mechanism. These mechanism are used where reciprocation motion in return stroke is much faster than the forward stroke. A machine shop shaper tool is a good application for this mechanism.

How is a quick return motion mechanism used?

A quick return motion mechanism is used in the shaper and slotter machine in which the circular motion is converted into reciprocating motion so that the slider moves forward and backwards. In the forward direction, the cutting process occurs while in return there is no such cutting.

What is the quick return mechanism in a slotter?

What is the Quick Return Mechanism? A quick return motion mechanism is used in the shaper and slotter machine in which the circular motion is converted into reciprocating motion so that the slider moves forward and backwards. In the forward direction, the cutting process occurs while in return there is no such cutting.

How is the quick return mechanism used in Shaper?

In the quick-return mechanism, a circular movement like the crank and lever mechanism is converted into reciprocal movement but the return time is different from the forward moment. In several applications, this process is used.