The rotary movement o the main drive is converted into reciprocating movement of the ram by the mechanism contained within the column. Two different mechanisms used in mechanical shapers are:
1. Crank and slotted link mechanism
2. Whithworth mechanism
Crank and slotted link mechanism
Figure illustrates the crank and slotted link mechanism. The drive from the motor is transmitted to the bull gear through a gear box. The front face of the bull gear is fitted with a rotary slide. The slotted link which is also known as rocker arm is pivoted at the machine base. The upper end of the rocker arm is forked and connected to the ram. The sliding block of the rotary slide is fitted to move inside the slotted link. As the bull gear rotates, the ram connected to the rocker arm will reciprocate.
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