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.

Why time in forward stroke is greater than reverse stroke in shaper?

During the forward stroke, the ram is holding the tool is reciprocating over the workpiece to cut into the required shape. Therefore in order to reduce the total machine time, It allows the ram holding the tool should move slower during forwarding cutting stroke and it comes faster in return stroke.

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.

How does quick return mechanism work?

Powered by a motor, the disc rotates and the arm follows in the same direction (linear and left-to-right, typically) but at a different speed. When the disc nears a full revolution, the arm reaches its furthest position and returns to its initial position at a quicker rate, hence its name.

What is quick return mechanism where they used?

Explanation: 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.

What is the motion of cutting tool and its cutting phenomenon in shaper machine?

A shaper is a type of machine tool that uses linear relative motion between the workpiece and a single-point cutting tool to machine a linear toolpath. Its cut is analogous to that of a lathe, except that it is (archetypally) linear instead of helical.

How a shaper differs from a planner?

The basic and main difference between shaper and planer is that in shaper machine work piece is fixed at the table and tool is in reciprocating motion which rub the work piece and cut unwanted metal. But in planer machine tool is act like as stationary body and work piece move over it.

What is the purpose of 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.

What is cutting stroke?

The actual process of sawing involves a push stroke and a pull stroke. The ‘cutting’ stroke refers to the stroke on which the cutting action actually takes place.