Bit/holder with enlarged ballistic tip insert
An improved diamond coated tip on a bit/holder for road milling operations has a broadened base that provides cutting overlap with adjacent bit/holders resulting in a micro milling type surface when utilizing a regular ⅝ inch center-to-center drum.
1. A bit holder comprising,
a body and a shank extending centrally axially from said body,
said body including a cylindrical recess adjacent a distal end thereof, said recess having a diameter of between five eighths and seven eighths inch,
a diamond coated bit tip insert disposed in the recess, the bit tip insert having a diameter at its widest part greater than five eighths inch, and
wherein said diamond coated bit tip insert includes an overfill portion extending outwardly of a widest portion of the diamond coated bit tip insert.
2. The bit holder as defined in claim 1 including a base of said diamond coated bit tip insert centrally axially behind a generally conical tip thereof that extends outwardly of said recess in said body at least ½ inch.
3. The bit holder as defined in claim 1 wherein said diamond coating consists of a single layer of polycrystalline diamond.
4. The bit holder as defined in claim 1 wherein said diamond coating includes multiple layers of diamond material.
5. The bit holder as defined in claim 1 wherein said bit tip insert includes a generally conical top portion including a parabolic curved section below an apex thereof.
6. The bit holder as defined in claim 1 wherein a base of said bit tip insert is cylindrical.
7. The bit holder as defined in claim 1 wherein a base of said bit tip insert is tapered inwardly toward a bottom of said base.
8. A diamond coated bit tip insert comprising: a body having a diameter greater than five eighths inch at a widest part,
said diamond coated bit tip insert includes an overfill portion extending outwardly of a widest portion of the diamond coated bit tip insert.
9. The diamond coated bit tip insert as defined in claim 8 wherein a base of said diamond coated bit tip insert centrally axially behind a generally conical tip extends at least three quarters inch from said generally conical tip.
10. The diamond coated bit tip insert as defined in claim 8 further comprises a diamond coating that includes a single layer of polycrystalline diamond.
11. The diamond coated bit tip insert as defined in claim 8 further comprises a diamond coating that includes a plurality of layers of diamond material.
12. The diamond coated bit tip insert as defined in claim 8 wherein said bit tip insert includes a generally conical top portion including a parabolic curved section below an apex thereof.
13. The diamond coated bit tip insert as defined in claim 8 wherein a base of said bit tip insert is cylindrical.
14. The diamond coated bit tip insert as defined in claim 8 wherein a base of said bit tip insert is tapered inwardly toward a bottom of said base.