No Cone Single Point Reamer/Drill

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This is a new use of a modified version of U.S. patent 6,030,156, that has not been commercialized. The peck drill design was originally used to produce small diameter deep holes (in sizes smaller than 1/16"). The modified version starts from 1/16" and larger. The peck drill has grown up. The point angle has been changed from a conical point to a 0 degree point angle, and while the tool is capable of drilling (albeit,producing oversize holes) using a drill press, lathe, or mill, or in a drill bushing, the primary application is to ream, or finish an existing hole to a more accurate size (within a few .ooo1")than is obtained by drilling, and to eliminate the cone at the bottom of a blind hole - something a conventional reamer will not do.

The original peck drill is seen in the center of the photo.

One of the new versions, (on the left in the photo) features extreme relief. This is suited to plastics and non ferrous metals. While the other version with its greater mass is suitable for harder materials. They may be produced from H.S.S. or tungsten carbide. Both will produce a square bottom hole as seen in the cross section of the brass part on the left. The extreme relief version can also be used in a non drilling application - to produce annular grooves (as seen in the part on the right) either in the face or the OD of the part by holding the cutter in a lathes tool post. This is particularly useful for producing O-ring grooves, which previously required special tooling. One would now select a drill whose radius corresponds to the O-rings cross section. In addition, because the tool resembles a boring bar either tool can in fact be used to enlarge a hole or produce a stepped seat on a part using the lathe. These applications are all beyond the scope of a traditional drill or reamer.

A further advantage of the tool is that it is easily resharpened and does not require special equipment to do so. Conventional drills & reamers require each face to be ground identically. In a single point tool there is no other edge to match. Additionally, if used to drill non critical holes in brass, because it also has a 0 degree top face rake angle the tool will not "grab" the brass as is typical with conventional drills promoting safer operation.

By eliminating the undesirable artifact left by conventional drills - the cone, it means thinner materials can be used saving additional costs and weight.

In summary, the current invention duplicates the tasks of multiple tools saving costs, reducing inventories, simplifies resharpening and saves materials. Moreover, it also eliminates calculating how much further one must drill to achieve the desired depth in a blind hole.


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  • Name:
    Randy Andronica
  • Type of entry:
  • Patent status: