This partial calculator treats the entered angle only as a selected event window within one driver turn. It does not reconstruct the named rim-lock mechanism because mating radii, center distance, tooth and concave land profiles, clearances and the transition into dwell are not defined.
Partial · Selected Event-Window Ledger
Partition a selected driver-angle window and compare it with equal follower positions without inventing rim-lock geometry.
Equation Used
- Follower positions are equally spaced.
- The entered angle is a selected schedule window only.
- The remainder is not labeled as a proven locked dwell.
- Mating radii, center distance, tooth and lock-land profiles, clearances, transition motion, impact and safety are excluded.
The secondary figure uses separated schedule and count dials, not a meshing mechanism.
Supported selected-window arithmetic
For N equal follower positions, one ideal count step is 360/N degrees. An entered angular window alpha partitions a driver revolution into alpha degrees selected and 360-alpha degrees remaining. Their shares are alpha/360 and (360-alpha)/360.
The words selected and remaining are deliberate: the input does not prove physical engagement or rim locking.
Use and boundary
Use the ledger to compare an entered driver-angle schedule with an equal-position count. Do not use it to determine a locking arc, tooth engagement, contact clearance, interference or impact.
Selected schedule identities
step=360/N; remainder=360-alpha; selected share=100alpha/360; remainder share=100(360-alpha)/360.
Default selected-value example
For N=10 and alpha=60 degrees, the ideal count step is 36 degrees, the selected window is 16.7% of a turn and the remaining 300 degrees is 83.3%.
Unsupported rim-lock claims removed
The former labels called the remaining angle a locked dwell and its percentage a rim lock. Those claims were removed because no mating lock surfaces or clearances were defined. The replacement uses separated schedule and count dials.
Questions
Is the selected window proven engagement?
No. It is a user-entered angular partition only.
Is the remainder a locked dwell?
No locking state is asserted without mating surface geometry.
Are the dials meshing?
No. They are intentionally separated.
References
References & Further Reading
- Wikipedia contributors. Geneva drive. Wikipedia
Building or designing a mechanism like this?
Explore the precision-engineered motion control hardware used by mechanical engineers, makers, and product designers.
