Dave Ware's Musical Clock

Dave writes: "This model did not end up the way it started and looks it! I started with the idea to build a contraption that would have a rotating drum with tabs on it to activate various items. It then evolved into making it into a music box. I experimented with various Erector parts and found that many had a musical ring when struck. But, I gave that up as too hard to make a mechanism that would strike them in succssion and also because I had no way to adjust their tones to make a reasonable scale. So I went back to a rotating drum using CR turret plates for the ends as they allowed making a 16 sided drum with 21 hole strips for the faces. A CH right angle was mounted on each face to strum more 21 hole strips that were adjusted in length to provide various tones. I gave up on making a full scale of notes and settled on a doable 4 notes which could play the Westminster Chimes sequence of 16 tones. The drum had to be direct driven from the motor gear train; thus the odd mounting of the motor. To call it music is questionable, but not for the same reason that the musical ferris wheel wasn't exactly Hi Fi.

     

The chimes suggested a clock, so I drove the 'minute' hand shaft from a pulley on the drum. The 'hour' hand is attached to the driven pulley with long screws so it can be on the front of the clock face while the pulley is behind and obscured by the 72 tooth gear which carries the 'minute' hand. The 'hour' pulley turns on the 'minute' shaft, but is not secured to it. The 'hour' hand is geared down by a three stage gear box which is also driven from the drum. It keeps pretty good time if it is exceptable that the 'minute' hand takes very close to 30 seconds to make one turn and the 'hour' hand rotates once in about 20 minutes. I haven't had it on long enough to time it."