Carbide Counterbore with Pilot .3580" Diameter x 5/32" Pilot Type 514
Carbide Counterbore
OD cutter:
Diameter Pilot shaft: 5/32”
We had these carbide counterbores custom fabricated for us to fit our caged bearings.
These counterbores have a removable pilot
We couldn’t anticipate the exact size pivot hole you will use so we used a standard size pilot hole in 1/8” or 3/16”, depending on which counterbore you purchase. You may need to use the counterbore with one size pilot hole and then ream up the pilot hole after milling out the bearing pocket. This is fairly trivial other than simply remembering to figure the (possibly) smaller hole into your build process.
These counterbores are admittedly expensive. Keep in mind they are carbide and made to fit the appropriate caged bearing. They will handle tough material like titanium. When they get dull, re-sharpen them with a diamond plate or send them to a tool re-sharpener.
Tips for using these: First, use plenty of cutting fluid and keep the tool and work piece cool. Titanium tends to heat up and expand grabbing any cutting tool. Make sure and clamp down your work down to your drill table or use a drill press vice. The pilots can be fragile and break when a work piece being milled slips. We can’t replace a broken pilot for operator error. If you are milling and the work starts to chatter, do something different. Change your speed or pressure or both. Don’t push through chatter. You could chip the carbide or damage your work piece. You should be able to smoothly mill out the pocket to the proper thickness by adjusting feed and speed and using fluid.
