A pantograph is a tool that reduces the scale of drawings and enlarges them. This mechanical device copies figures and plans on different scales.
Enlargement
Decide on the size ratio of the drawing and place central pivotal screws in the holes of the arm sections of the pantograph. Securely insert the tracing point, which is the pivotal screw with the pointed tip. Securely insert the lead holder, which is the pivotal screw with the dull point, into the bottom arm of the pantograph. Securely insert the support--the pivotal screw with the rounded tip--into the top, middle arm. Connect the board clamp to the table's side with the pin facing upward.
Attach the pantograph to the board clamp. Put the drawing of the original under the tracing point. Position the enlarged drawing's paper under the lead holder. Lead the tracing point gently across the drawing, and carefully press down on the lead holder to make the drawing larger.
Reduction
Settle on the ratio of reduction and place two central pivotal screws in the holes of the arms. Switch the positions of the tracing point and the lead holder. Do not remove the support pin from its position. Follow the same steps as the enlarging process to reduce the size of the picture.
For the Best Results
Do the procedure on a smooth surface. Ensure the pivotal screws go through the holes at that same number ratio. Ensure that they and the components are strongly fastened. Fasten all the papers to a table. Use a lead pointer to make sure the lead is sharp.
Tags: lead holder, tracing point, pivotal screw, pivotal screw with, pivotal screws