Motion Works Example

[BillM]

Art

I thought I'd switch gears away from my escapement experiments. Attached is a zipped version of a motion works experiment.
The lower left gear has the drive motor set to 1200 Max RPM . My "minute" and "hour" hands are simply bars that I've used in other experiments. The gearing provides a 12:1 reduction between the minute hand and hour hand. The lower gear pair provides 3:1 reduction and the upper gear pair provides a 4:1 reduction.

It was a bit of a challenge have the minute and hour hands on concentric shafts. Gearotics provides a calculated shaft center distance. I miss the gearotics gear calculator where you can specify a shaft distance to come up with the Module necessary to build the upper pair of gears. The ability to move a shaft around a gear is also a handy feature for folks needing to reposition a gear after it's been placed.

Although the motor has a 1200 Max RPM, the drive gear rpm is ~120. The next gear in the train shows a ~40 rpm rate as does the upper gear on that same shaft. Curiously though the upper left gear shows ~40 rpm instead of ~10. The hour hand does show the expected ~10rpm.

I guess that processor load or time quantification is the reason for the difference between the Motor RPM and the measured rpm of the driven gear.

Bill

[ArtF]

Hi Bill:

Yes, as a velocity based simulation the quantization of time may be off a bit. The gears can also appear out of sync at times,
I have a line item to make that tighter later on. I am recoding the fusing routine as I had made a base assumption on
that that appears false. It will be working better soon.

Art