ProvenCut’s website provides pictures, videos and cutting information for each speed and feed recipe.  You can also view a video of the machining operation at cteplus.delivr.com/29n2k

Tudor created a special ceramic version of the Black Bay — in partnership with the Formula One Visa Cash App Red Bull racing team.

Recipe 502 was a Fusion 360 adaptive roughing strategy run at 12.2 m/min. (40 sfm) and 0.033 mm/tooth (0.0013 ipt) with a 15.875 mm (0.625") axial DOC (ap) and 0.508 mm (0.02") radial DOC (ae). Recipe 505 was a 2D contour finishing strategy run at 15.2 m/min. (50 sfm) and 0.025 mm/tooth (0.001 ipt) at the same 0.625" axial DOC to remove the 0.02" radial stock left after roughing, imparting an excellent surface finish.

These ProvenCut recipes were performed on a Tormach 1100, a 499-kg (1,100-lb.), 1.1-kW (1.5-hp) CNC mill. It has similar capabilities as a Bridgeport. Tormach machines target the “prosumer” market and often are found in garage shops and R&D departments.

The 2024 Black Bay Ceramic “Blue” is presented in a 41 mm x 14.4 mm matte black ceramic case with a micro-blasted finish and monobloc middle case.

Microprocessor-based controller dedicated to a machine tool that permits the creation or modification of parts. Programmed numerical control activates the machine’s servos and spindle drives and controls the various machining operations. See DNC, direct numerical control; NC, numerical control.

John Saunders owns and operates Saunders Machine Works, a manufacturer of machine shop tools and fixture plates. He documents his machining and entrepreneurial endeavors on the YouTube channel NYC CNC and is founder of ProvenCut, a website with a video library of speeds and feeds.

The Tudor Black Bay Ceramic “Blue” (Ref. 79210CNU-0007) comes with a tapered 22 mm lug width hybrid leather and rubber strap with exclusive blue stitching and folding clasp in black PVD-treated 316L steel and a complimentary 22 mm non-tapered black fabric strap with blue band and black PVD-treated 316L steel buckle. Retail is $5,150.

Though created for a racing team, this is still a dive watch through and through, and in addition to the dive bezel the Black Bay Ceramic “Blue” features a 200-meter depth rating, a screw-down winding crown in black-PVD-treated 316L steel, a box-type domed sapphire crystal on the front, and a screw-in open caseback in black-PVD-treated 316L steel with a sapphire crystal.

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Larger machine tools with more rigidity can handle higher removal rates and higher surface footage. ProvenCut recipe 81 was a great example of using a Haas VF-2 and a seven-flute, 12.7 mm (0.5") carbide endmill at 45.7 m/min. (150 sfm) to machine 60-HRC D-2 tool steel.

In line with the innovative technology used in Formula One racing, Tudor’s cutting-edge automatic bidirectional winding caliber MT5602-1U is not just COSC-certified, it’s also fully Metas certified as a Master Chronometer and is adjusted to a rate of -2/+4 after being cased up. The 25-jewel, 31.8 mm x 6.5 mm movement beats at 4Hz, has stop seconds for precision time setting, a non-magnetic silicon balance spring, and a variable inertia balance. In addition, the certification also guarantees the timekeeping accuracy of a watch subjected to magnetic fields of 15,000 gauss, the 200-meter water resistance rating claimed by the manufacturer, and the 70-hour power reserve.

Highlighted by a Red Bull-racing inspired blue domed dial — PVD-treated applied indices, and matching hands (hour, minute, and center second), contrast the bright blue hue of the clutter-free no-date dial. A unidirectional rotatable 60-minute bezel in black PVD-treated 316L steel with a 60-minute graduated black ceramic insert with a sunburst satin finish and engraved markings and numerals complete the stealthy look.

Machining operation in which metal or other material is removed by applying power to a rotating cutter. In vertical milling, the cutting tool is mounted vertically on the spindle. In horizontal milling, the cutting tool is mounted horizontally, either directly on the spindle or on an arbor. Horizontal milling is further broken down into conventional milling, where the cutter rotates opposite the direction of feed, or “up” into the workpiece; and climb milling, where the cutter rotates in the direction of feed, or “down” into the workpiece. Milling operations include plane or surface milling, endmilling, facemilling, angle milling, form milling and profiling.

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Milling cutter held by its shank that cuts on its periphery and, if so configured, on its free end. Takes a variety of shapes (single- and double-end, roughing, ballnose and cup-end) and sizes (stub, medium, long and extra-long). Also comes with differing numbers of flutes.

Runs endmills and arbor-mounted milling cutters. Features include a head with a spindle that drives the cutters; a column, knee and table that provide motion in the three Cartesian axes; and a base that supports the components and houses the cutting-fluid pump and reservoir. The work is mounted on the table and fed into the rotating cutter or endmill to accomplish the milling steps; vertical milling machines also feed endmills into the work by means of a spindle-mounted quill. Models range from small manual machines to big bed-type and duplex mills. All take one of three basic forms: vertical, horizontal or convertible horizontal/vertical. Vertical machines may be knee-type (the table is mounted on a knee that can be elevated) or bed-type (the table is securely supported and only moves horizontally). In general, horizontal machines are bigger and more powerful, while vertical machines are lighter but more versatile and easier to set up and operate.

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Although cutting tools designed specifically for hard milling are available, we chose a standard four-flute carbide endmill that many machinists already have on hand. Our testing focused on avoiding cutting tool vibration and ensuring that excessive heat was not created. We pushed the tool and machine to achieve an aggressive but sustainable roughing recipe and concentrated on the surface finish of the workpiece for the finishing recipe. Machining 8620 alloy steel hardened to 55 HRC can leave an outstanding surface finish with luster even when cut on a small CNC machine.

Incorrect speeds and feeds are a surefire way to make terrible noises, break tools and scrap parts. Our initial attempts to machine a hardened ring gear made noises that would make any machinist shudder. Through experimentation, we optimized reliable recipes that result in an excellent surface finish and provide good tool life.