![]() Have a few practice runs - you will soon get the "hang" of it. The flat-bottom drill is only doing the same job as a more expensive milling cutter anyway. Do set the depth guage on the drill/mill just leave the drill "hard down" on the stop and let it finally clean it out - and voilà - counter-bore done. Slow the drill down and fit the flat-bottom/ed drill, use plenty of cutting/tapping oil and just feed slowly and "peck" the cone out. So if say you were to drill a 1/4" hole and a 1/2" counter-bore, just drill the 1/4" hole as normal, follow it with a 3/8" and 1/2" normal drills so that all you had to do with the flat-bottom/ed drill was to "clean up/out" the "cone" from the 3/8" and 1/2" drills. Grind the now "flat/square" drill end so that you have minimal (say 5 to 10 degrees) of "front clearance". Civil War camps for youth and reenactments are held at the site annually. Just grind the end of the drill "square" - as if you were "facing off" a rod in the lathe. The Endview Plantation house turns 250 years old this year and now serves as a museum focused on the Civil War. Make it from an old/existing drill of the required size - the shorter the better as it works better if "stiffer" and less flexible than a new/ish drill. It is quite possible and normal - and functional - to make and use a flat-bottom/ed drill. I realize that a counter bore might be used in some applications but if they make end mills that can be plunged, what are they called and where can they be purchased. I need holes to be flat on the bottom or otherwise I would use a drill. I'm sure they make them (they seem to make everything else), but I would like to purchase several end mills that can be plunged into metal, e.g., 1/2 inch deep, or be plunged into a smaller existing hole. Should I post separate threads to address my three projects since you've answered my question about end mills that can be plunged or can talk on the three projects be continued in this thread? The most pressing project is the 1" dia blind hole with a flat bottom. these are my needs hence my reasons for posing the initial question of plunging an end mill. ![]() The material for this project is aluminum. The third project involves creating a blind hole 1" in dia to a depth of 1" and the bottom of the hole must be flat and square with the hole's vertical wall. Because it was not "center cutting" it ceased to cut when coming to rest on the non-cutting area of the end mill. I attempted to use a 4 flute cutter to counter bore a hole and it worked well for only a short distance. The second project resembles Willy's project. Flats on the hex head are damaged from oxidation so I thought I would remove the hex head screw by carefully plunging an end mill to depth of the original shoulder hoping to preserve the "flat" on which the hex head rest and worry about the remaining stub once the rotary top had been removed. I need to remove the top of the rotary table for cleanup purposes and one hex head screw is so badly oxidized that it can't be removed. The first and less pressing project involves a badly corroded hex screw in the top of a 10" rotary table. I am working on three unrelated projects all needing flat bottom holes or shoulders. SmokeDaddy has also posted a link that demonstrated a similar need. A nature trail, medicinal herb garden, outbuildings, and wayside markers are located on the grounds.Willy has posted a picture of a mounting plate that pretty much demonstrates what I need to do with regard to plunging. The property remained in the Harwood/Curtis family until 1985.Īn exhibit along with a guided house tour provide information on the home’s history, 400 years of family ties to the land, and Dr. Two flute center cutting can be plunged more easily than four flutes and if you have a dinky mill its hard to get an accurate sized hole making a plunge cut with an endmill. At the conclusion of the Civil War, the Curtis family returned and Dr. For a flat bottom, just drill to size and clean up the bottom with any center cutting endmill - thats the easiest. During the Peninsula Campaign, Confederate generals Lafayette McLaws and Robert Toombs headquartered on the property, at which time the Curtis family relocated to a different part of Virginia. In 1861, he organized a volunteer Confederate militia company known as the Warwick Beauregards to provide local defense in the early months of the Civil War. ![]() Humphrey Harwood Curtis, a physician and a great-grandson of William Harwood, acquired the property in 1858. The Georgian-style house was located in close proximity to the route taken by the Continental Army and Virginia militia on their advance to the 1781 battle that ended the Revolutionary War. Constructed in 1769 for the Harwood family, Historic Endview is one of the last remaining colonial buildings in Newport News. ![]()
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