Synchronization of retrieval system and oscillator for sled-based application of a coating material

A method for applying a coating material to an interior of a pipe, comprising:

• providing a planetary gear retrieval system including a network of gears including a first gear, a second gear, and a third gear, the first gear being powered by a gear motor;
• fixing the planetary gear retrieval system to a floor of the pipe;
• providing a first variable speed microcontroller on the planetary gear retrieval system, the first variable speed microcontroller in operable communication with the gear motor;
• providing a sled spaced away from the planetary gear retrieval system, the sled including a pair of skis, a linear oscillating plate, and a spinner supported by the linear oscillating plate;
• providing a second variable speed microcontroller on the sled, the second variable speed microcontroller in operable communication with the linear oscillating plate;
• and
• threading a chain through the first, second, and third gears;
• attaching an end of the chain to the sled;
• programming the first variable speed microcontroller to control the gear motor to rotate the first gear at a constant angular velocity, thereby pulling the chain and the sled at a constant rate in a direction toward the planetary gear retrieval system;
• programming the second variable speed microcontroller to control the linear oscillating plate to oscillate at a rate that achieves a desired number of passes along a length of travel of the sled.