Cutting by use of rotating axially moving tool – Tool of specific diverse material
Reexamination Certificate
1999-10-08
2001-03-27
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Tool of specific diverse material
C408S199000, C408S227000
Reexamination Certificate
active
06206619
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to cutting tools and more specifically to a non-adjustable single cylindrical lip boring tool which allows a machinist to greatly reduce the amount of time needed to create accurately located dowel pin holes in a piece part.
2. Discussion of the Prior Art
A problem frequently encountered with machine tools such as vertically spindled milling machines is maintaining locational accuracy of reamed dowel pin holes in a metal piece part. A dowel pin hole is commonly created by first drilling an undersized hole. The problem with the undersized hole is that drills tend to stray away or walk from the intended location, even when a center drill is employed. One way to solve the drill runout problem is to use a boring bar to straighten out the drill hole. The boring bar creates an opening which is a few thousands smaller than a reamer. The reamer is then used to remove the remaining few thousands of material. If the reamer were used without a boring bar, the reamer would follow the runout in the drilled hole and produce an inaccurately located dowel pin hole. Unfortunately, setting up the boring bar for creating the dowel pin hole is very time consuming. The drawback to using a boring bar is that the boring bar must be adjusted often as the bored hole is increased to the desired few thousands under reamer size.
Another solution to the problem of drill hole runout is to use an undersized end mill. The undersized end mill has the rigidity to prevent being pulled into a run out situation by a drill hole with runout. The drawback of the undersized end mill is two fold. First, end mills are not manufactured undersize. The supply for undersized end mills comes from worn end mills that have had their diameters resharpened. The other problem is that the end mill diameter may be inaccurately ground to a slightly negative taper along its axial length; this may cause one flute of the end mill to grab the side wall of the hole and lose hole locational accuracy.
Accordingly, there is a clearly felt need in the art for a non-adjustable single cylindrical lip boring tool which allows a user to consistently create an accurately located straight hole for final reaming of a dowel pin hole without time consuming boring bar set-up.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a non-adjustable single cylindrical lip boring tool which allows a user to consistently create an accurately located straight hole for final reaming of a dowel pin hole without time consuming boring bar set-up.
According to the present invention, a first embodiment of a non-adjustable single cylindrical lip boring tool includes a shank, a body, a straight side lip, and a front cutting edge. The shank is formed on an end opposite the body. The shank is a standard nominal sized diameter either English or Metric which is adapted for insertion into a chuck or spindle collet of a machine tool. The straight side lip is formed on the body. The straight side lip has a radially convoluted relief which blends into the body, and a slightly tapered axial relief that alleviates interference caused by deflectionary cutting forces. The front cutting edge has a back relief.
A second embodiment of a non-adjustable single cylindrical lip boring tool includes a shank, a body, a helical side lip, and a front cutting edge. The shank is formed on an end opposite the body. The shank is a standard nominal sized diameter which is adapted for insertion into a chuck or spindle collet of a machine tool. The helical side lip is formed around the body. The helical side lip has a radially convoluted relief which blends into the body and a slightly tapered axial relief that alleviates interference caused by deflectionary cutting forces. The front cutting edge has a back relief.
The non-adjustable single cylindrical lip boring tool is preferably manufactured for creating dowel pin holes in {fraction (1/16)} inch diameter increments, or standard metric sizes. Both embodiments of the non-adjustable single cylindrical lip boring tool may be sharpened on a hand grinder. The single lip also means that the cutting tool has a single flute.
Accordingly, it is an object of the present invention to provide a non-adjustable single cylindrical lip boring tool which decreases the amount of time required to created an accurately located dowel pin hole.
It is a further object of the present invention to provide a non-adjustable single cylindrical lip boring tool which is easily sharpened.
Finally, it is another object of the present invention to provide a non-adjustable single cylindrical lip boring tool which does not require extensive machine tool set-up time.
These and additional objects, advantages, features and benefits of the present invention will become apparent from the following specification.
REFERENCES:
patent: 1241176 (1917-09-01), Watts
patent: 3147645 (1964-09-01), Cooper
patent: 3250154 (1966-05-01), Breuning
patent: 3857305 (1974-12-01), Lichtman
patent: 3945807 (1976-03-01), Fukutome
patent: 4080093 (1978-03-01), Maier
patent: 5066170 (1991-11-01), Berryer
Ersler Donald J.
Howell Daniel W.
LandOfFree
Non-adjustable single cylindrical lip boring tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-adjustable single cylindrical lip boring tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-adjustable single cylindrical lip boring tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2472836