Carbide Counterbore - 1/4" Cut Diameter with x 3/32" Pilot Hole
Cut Diameter: 1/4
Pilot Hole: 3/32”
2 piece construction (pilot sold seperately)
This counterbore is made of steel and has carbide cutting edges brazed on.
We had these carbide counterbores custom fabricated for us
Counterbores are used to cut a pocket or recess that is centered over an existing hole. In knifemaking they are used to make the heads of screws, pivots, etc sit flush in surrounding material or to cut pockets for the heads of corby bolts and other handle fasteners.
Interchangeable pilot counterbores can be used with multiple different sizes of pilot. This allows you to pick a counterbore and pilot combination that suits your needs. The pilot will fit into hole in the end of the counterbore and is held in place with a set screw.
To choose the counterbore and pilot you need, look for a pilot the same diameter as the through hole and a counterbore the diameter of the pocket you need to cut. Make sure the shank size of the pilot matches the hole size in the counterbore so the two parts will fit together.
These counterbores have a removable pilot
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.