Watch Glossary

Jewel on balance wheel that receives impulses from pallet fork escape wheel

Calibers designed and produced by watch brand, Omega 9300, Seiko 9R65, AP 3120 examples

Shock-absorption system using jeweled bearings to protect delicate balance staff from impacts.

Bilateral balance requirement of index regulator arms to prevent chronometric asymmetry.

Engineering technique removing mechanical play between index regulator components.

Mechanical resistance required to move index regulator arms during timing adjustment.

Total achievable rate correction span via index regulator adjustment before mechanical limits.

Numerical value representing resistance between the regulator pin and the hairspring lever.

Lag between index regulator movement command and actual hairspring length adjustment.

Rotational force required to move the timing lever from a fixed regulator pin position.

Critical measurement of the semicircular grooves on the regulator pin engagement surface.

Centered mechanical state of index regulator where hairspring length correction equals zero.

Thread specification controlling fine adjustment increments on index regulator mechanisms.

Examination of regulator pin surface abrasion to assess timing lever contact consistency.

Chronograph components built into base movement, Zenith El Primero and Omega 9300 examples

Zenith measurement of how column wheel integration affects rotor moment calculations

Gear wheel engaged by setting lever to allow independent time adjustment