The Titanium Polishing Project, Part 2
In our last episode, the titanium block was being unevenly sanded because the top-mounted arm caused it to buck up on edge during the return stroke. This was remedied by attaching the arm to the bottom edge of the block.
To prevent the little motor from overheating, a timer was added which cycled the system on and off each hour. But repeated overnight trials demonstrated that the rubber band could only sustain an hour or two before breaking. Incriminating eraser-type dust suggest that the rubber band abrades against the edges of the wheel, rather than failing due to heat.
A cardboard sleeve was added to prevent the wheel from sliding down the axle.
With the major problems taken care of, the motor was run one or two hours a night for about a week before the power supply gave out. It was a 14V DC adapter harvested from an answering machine, and should have been more than sufficient to power the 12V motor.
There is noticeable progress in the polishing.
To prevent the little motor from overheating, a timer was added which cycled the system on and off each hour. But repeated overnight trials demonstrated that the rubber band could only sustain an hour or two before breaking. Incriminating eraser-type dust suggest that the rubber band abrades against the edges of the wheel, rather than failing due to heat.
A cardboard sleeve was added to prevent the wheel from sliding down the axle.
With the major problems taken care of, the motor was run one or two hours a night for about a week before the power supply gave out. It was a 14V DC adapter harvested from an answering machine, and should have been more than sufficient to power the 12V motor.
There is noticeable progress in the polishing.