Lift angle chart

Hi, everyone!

I tried googling but couldn't find any reliable information about lift angle values for IWC calibres. Timegrapher app on my phone is a useful tool for checking the amplitude and beat error, but you need to know lift angle for each particular movement. I saw that there was a thread a few algebra back where some of the forum members were talking about a chart with this values by IWC. Can someone send me a PM with how to get hold of it?

I have a VC Portofino, Portugieser Pure Classic and a Da Vinci Automatic.
Thanks a lot!

Hi Ivan,
found this link: www.lepsi.ch/lift-angle/.

br Cromagnonman

Hi Ivan,
The calibres in Cromagnonmans link are older than your watches.
Your watches have the following lift angles:
VC Portofino, 40
Portugieser Pure Classic, 52
Da Vinci Automatic, 51*
Leo

Thank you, guys! :)

Good information. Thank you

2 more calibres from which i would like to know the lift angle.

• BIG Pilot REF 5002 (18000bph) -> Calibre 5011

• F.A. Jones REF 5442 (18000bph) -> Calibre 98290

What can be derived from the lift angle? Is there an optimal value, does this depend on the use of the watch, like dressy or sporty?

Kind regards,
Paul

It's the optimal angle where the refractant coifficient of the crystal results in the best view of the dial ;o)

Lift Angle is the amount the pallet fork rotates when locking and unlocking from the escape wheel. It is used to calculate the amplitude of the Balance wheel. Literally the tick tick we hear.

Thank you, Mark. Does this value have any significance for the potential owner of a watch, or for the watchmaker, is there a value to strive for? Like, the frequency of the movement: the higher the number, the easier to set that movement accurate, but also, the more potential wear and tear for that movement (as far as I understood this).

Kind regards,
Paul

Hi Paul
Thanks for the question.

The lift angle is specific to suit each movement, and is determined at the design stage to optimize the impulse to the Balance.

On the other hand, Amplitude of the Balance wheel is variable. From 270 to 300 degrees and when wear, dirt or dried oil reduce the amplitude to less than 250 degrees, service is required.

Knowing the Lift Angle is required for a timing machine to calculate the Amplitude.

Here's an explanatory video LIFT ANGLE...

5011 : 42°
98290 : 40°

Cheers

This is interessting info.
What about the lift angle of the 79350 (I.e 3714)?