A counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature.
What is the purpose of liner protrusion?
The main purpose of cylinder liner or sleeve protrusion is to give you the proper amount of “crush” on your cylinder head gasket. This ensures that once torqued, your cylinder head crushes the gasket evenly and to the correct specification.
What is spot face in machining?
A spotface or spot face is a machined feature in which a certain region of the workpiece (a spot) is faced, providing a smooth, flat, accurately located surface. The cutters most often used to cut spotfaces are counterbore cutters and endmills.
What causes a dropped liner?
Improper Cooling System Maintenance The liners in this engine failed within 800 miles. Improper cooling system maintenance is the root cause of failure. Cooling system corrosion inhibitors are needed in all situations, even if antifreeze is installed.
Why counter bores are used?
Countersinking is done to insure that flat head screws sit flush to the work piece. A counterbore is used to enlarge the opening of a hole producing a flat bottom so a socket-head screw will fit flush with the surface of the part. Lock washers may be used to ensure a secure assembly.
Why must screws be counter bored below the surface of the tool?
By using a counterbore, the manufacturer has an opportunity for hiding the fastener completely during the joining process. The fastener can be made to lie either flush with or below the surface of the workpiece such that the head does not hinder the design.
What kind of counterbore do you use for chassis shims?
Counterbore & Sleeve Cutting Tools Apex Tool Company carries a full range of upper and mid stop counterbore tools. Our M series upper counterbore tools are designed to be low profile and allow in chassis shim cutting on most vehicles.
How can I improve the bore geometry of my honing machine?
A honing machine that offers variable speed stroking and can dwell in the bore while maintaining the same loading reading will produce better bore geometry than a machine that lacks these features. Using a coolant that is compatible with your honing stones will also improve bore geometry.
What is the purpose of boring and honing a cylinder?
One of the goals of boring and honing cylinders is to size the bores to a specific dimension. If an engine is being remanufactured to meet specific criteria, that usually means boring and honing to achieve a standard oversize (.010?,.020? or.030?).
What kind of counterbore tools does Apex Tool Company carry?
Apex Tool Company carries a full range of upper and mid stop counterbore tools. Our M series upper counterbore tools are designed to be low profile and allow in chassis shim cutting on most vehicles. These tools are designed to last for years of constant use and the plates will interchange with the Kent-Moore Porta Tool Machine.
