Journal Entry #0033
2025-11-26, Anthony Remark, Marian Scientific, AMDG
Over the past several days, there was a major effort to complete the CAD for the MM1 Minute hand gears.
It was necessary to make the modulus big enough to withstand rigorous use and be 'reasonably sized', basically can the gears fit in the encasement
and fit outside the encasement if need be?
The first gear is called the minute drive gear because it's connected to the minute hand and drives the other gears.
The gear has a modulus of 2mm and 10 teeth
the shaft of the gear is an extention of the encoder shaft. because everything could not be fitted to the encoder shaft.
The minute hand fixes on top of that shaft.
The second gear has the same modulus (2mm) and 30 teeth. The hole is slightly larger than a 1/4. This is designed to fit a
1/4 inch wooden dowel.
The third gear has the same modulus and with 8 teeth. It has a hole slightly larger than 1/4 inch just like Gear 2. the
both of these gears are intented to be glued together.
The Hour Gear has the same modulus with 32 teeth. built in is the tube that rests over the minute drive gear shaft.
The Hour hand is fitted over the Hour Gear tube.
Here is everything assembled in FreeCAD
