Milling Machine Used To Make “Rasp File Knife”

2018 - Volume #42, Issue #3, Page #40

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Greg Korner recently sent photos of a big, “sword-style” rasp file knife that he made using his Bridgeport milling machine.
  The knife measures 16 1/2 in. long overall and was made from an old flat rasp bar from a farrier shop. The blade is hollow-ground on both sides and has a rounded end. The teeth on the rasp bar show through at the middle on both sides of the blade.
  The file was originally 5/16 in. thick. Korner ground it down 10 thousandths of an inch on each side in order to smooth out the rasp “teeth”.
  Korner made the knife for Brian Vigar of Lancer, Sask., who called Korner after reading an article on “rasp file knives” in FARM SHOW (Vol. 41, No. 1).
  “This is one heavy-duty knife. It looks a lot like a small Roman Centurion sword,” says Korner. “Vigar has a knife collection and wanted to add to his collection.”
     “Using a bench grinder to make a file knife this big would have taken a long time, and it would have been very difficult to produce uniform, hollow-ground edges on a knife this big.”
  The Bridgeport milling machine has a 39-in. long table that can be moved back and forth, and a head that mounts on a turret allowing it to be rotated 360 degrees. Korner fitted it with a big 10-in. dia. aluminum oxide grinding wheel.
  “I moved the table back and forth to grind the edge of the blade strip by strip, raising the table as needed. Once I reached the center line of the blade I removed the clamp and flipped the blade over so I could grind the other side,” says Korner. “The knife is precision ground from one end to the other, and the blade edges are as sharp as a razor blade.”
  He used an ordinary bench grinder to make the rounded nose and added a mahogany handle with brass rivets.
  Vigar paid $250 for the knife.
  Contact: FARM SHOW Followup, Gregory C. Korner, Sr., 6020 Lookout Rd., Brookville, Ind. 47012 (ph 765 647-6314; lookoutmntrr@hughes.net).

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Milling Machine Used To Make “Rasp File Knife” FARM HOME Miscellaneous Greg Korner recently sent photos of a big “sword-style” rasp file knife that he made using his Bridgeport milling machine The knife measures 16 1/2 in long overall and was made from an old flat rasp bar from a farrier shop The blade is hollow-ground on both sides and has a rounded end The teeth on the rasp bar show through at the middle on both sides of the blade The file was originally 5/16 in thick Korner ground it down 10 thousandths of an inch on each side in order to smooth out the rasp “teeth” Korner made the knife for Brian Vigar of Lancer Sask who called Korner after reading an article on “rasp file knives” in FARM SHOW Vol 41 No 1 “This is one heavy-duty knife It looks a lot like a small Roman Centurion sword ” says Korner “Vigar has a knife collection and wanted to add to his collection ” “Using a bench grinder to make a file knife this big would have taken a long time and it would have been very difficult to produce uniform hollow-ground edges on a knife this big ” The Bridgeport milling machine has a 39-in long table that can be moved back and forth and a head that mounts on a turret allowing it to be rotated 360 degrees Korner fitted it with a big 10-in dia aluminum oxide grinding wheel “I moved the table back and forth to grind the edge of the blade strip by strip raising the table as needed Once I reached the center line of the blade I removed the clamp and flipped the blade over so I could grind the other side ” says Korner “The knife is precision ground from one end to the other and the blade edges are as sharp as a razor blade ” He used an ordinary bench grinder to make the rounded nose and added a mahogany handle with brass rivets Vigar paid $250 for the knife Contact: FARM SHOW Followup Gregory C Korner Sr 6020 Lookout Rd Brookville Ind 47012 ph 765 647-6314; lookoutmntrr@hughes net

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