These instructions describe two new designs for Meccanographs.
These were inspired by a desire to demonstrate the Schmidt coupling in use. The Schmidt coupling was evidently invented for use in offset printing machinery. Its function is to transmit a steady rotational motion from an input shaft to a parallel but non-aligned output shaft the position of which may change continually.
This model shows how the Schmidt coupling worked with an actual moving output shaft. Once this function is achieved then it is a simple matter to add a pen holder, and pen arm cam to put the device to practical use. Once a mechanism is devised to both rotate a designing table, and move it to and fro, it is evident that a pattern may be drawn even when the pen is fixed in one position. By adding pen movement the pattern becomes more complicated.
The Schmidt Meccanograph Mark 1 is the simpler of the two. Its instructions cover the Frame, Designing Table Support Cage, Backlash Control, Schmidt Coupling, Pen Cam Support Structure, Pen Cam Drive, Pen Cam, Designing Table Transverse Motion, Fulcrum Adjustment, Primary Drive, Pen Arm, Designing Table, and Operation of the Meccanograph.
The Schmidt Meccanograph Mark 2 incorporates three gearboxes which allow the cam speeds and the table rotation speeds to be varied. Its instructions cover the Frame, Primary hand Drive, Cam Drive Layshaft, Cam Drive Gearbox, Pen Cams, Table Drive Layshaft, Table Rotation Gear Change, Designing Table Support Cage, Transverse Motion Cam, Transverse Motion Table Link, Pen Support Arm, Pen Arm Support, Pen Arm Drive Strips, and Operation of the Meccanograph.
With the 18 page instructions are five colour and fourteen black and white illustrations. and a Parts List for each Meccanograph.
Please note these Model Plans are designed by individual Meccano modellers and may use parts not currently available. The level of instruction detail is dependent on the original modeller and varies from plan to plan. These are instructions only.