Sitting at the Workbench with Karsten Frassdorf and an In-Depth Look at the Spirograph Tourbillon’s Calibre 360

By rolex
June 4, 2021
4 min read

If you are an ordinary peruser of Monochrome-watches you may be acquainted with Montres KF’s Spirograph , a wristwatch that can withstand stuns up to 5,000G and attractive fields up to 1,000 Gauss. Inside the 45mm Spirograph is the caliber 360, a hand-wound development directed by an eye-getting and remarkable curiously large tourbillon. We sat at the workbench with the German expert watchmaker to dismantle the caliber 360 and go inside and out with this exceptional movement.

The development architecture

The caliber 360 is an enormous development with a column engineering. All parts are fitted in the middle of two plates protected along with columns, rather than having a plate and scaffolds screwed firmly together. This conventional engineering is motivated by that of marine chronometers. Past the gesture to horological custom and exemplary exactness watchmaking, this arrangement additionally offers improved stun opposition, among different reasons since it takes into account a decrease in the heaviness of the development. Nonetheless, this is a requesting arrangement requiring extraordinary assembling precision.

To make the development hostile to attractive, basic parts that ought to steer clear of attraction have been molded out of non-attractive materials.

Karsten Frassdorf additionally utilizes pins to get all parts together, guaranteeing that these are consummated situated. It additionally offers ideal stun obstruction as all parts are firmly held together. The development’s effectiveness is additionally improved gratitude to the ideal situating of all parts. However, once more, this arrangement requires very exact assembling. In a comparable fashion,  rather than feet, the dial is held set up by 3 pins and screws.

Chronometry and development productivity are major concentrations for Karsten Frassdorf. For example, he has settled on CuBe wheels for ideal tribological productivity (the hardness of CuBe is ~380 Vickers versus ~200 for metal). Generally, the movement’s productivity is of 75% as indicated by the German Master watchmaker (Editor’s note, mechanical efficiency measures the viability of a machine in changing the energy and force). This permits the caliber 360 to accumulate to 70 hours of force hold on only one barrel and to utilize a huge offset with high latency, which is better as far as chronometry.

The Tourbillon

The first thing to get the attention with the Spirograph is its huge one-minute tourbillon ticking at a sluggish, entrancing 18,000 vibrations each hour. It is 16mm in distance across with a snapshot of dormancy of 60. Its unique plan includes no equilibrium edge except for two huge, weighty loads. It is fitted with 4 directing screws: the enormous screws are for characterization, the more modest ones are for fine-change (one turn approaches 6 seconds/day).

Fashioned out of Straumann amalgam, the hairspring has two terminal bends: the inward bend is a Grossman curve and the external a Phillips (or Breguet) curve. This improves the hairspring concentric turn of events. As it inhales ideally, the isochronism of the equilibrium (editorial manager’s note: having a steady period paying little heed to the adequacy) is improved. This extraordinary combination is incredibly sensitive to produce and must be created/formed by hand.

A astute development, the tourbillon is not difficult to set up gratitude to the fixed stuff around the tourbillon opening. This fixed toothing is held set up by 4 pins to guarantee ideal situating and effectiveness. The gem bearing for the tourbillon is set with a removable chaton to consider straightforward aftersales administration operations.


Just like for the tourbillon gem bearing, the barrel includes a chaton to consider simple activities (handshake or gem oil). The origin harness is a T type (or Wittnauer type). This considers the ideal concentric improvement of the spring inside the barrel’s drum,  upgrading its efficiency.

The keyless works

An unique arrangement, the keyless works are an implicit a module, guaranteeing simplicity of adjusting. The first stuff course of action targets guaranteeing a smooth winding and long haul reliability.

For more insights regarding the watch and to perceive how it wears consistently, kindly counsel our survey here . More subtleties on .