Precured tire tread repair grinding bit

Abstract

A grinding bit is provided. The grinding bit includes a shank having a central axis and a cutting body. The shank further includes a first shank end and a second shank end opposite to the first shank end. The first shank end is configured for operably coupling to a rotary tool. The cutting body is coupled to the second shank end and extends axially away from the shank along the central axis. The grinding bit may include a shoulder surface extending radially from the shank in between the first shank end and the second shank end.

1 . A grinding bit comprising:
 a shank having a central axis and comprising a first shank end and a second shank end opposite to the first shank end, the first shank end configured for operably coupling to a tool, wherein the shank shape prevents the shank from being inserted into the tool past an insertion depth; and   a cutting body coupled to the second shank end and extending axially away from the shank along the central axis.   
     
     
         2 . The grinding bit of  claim 1 , wherein the cutting body is coated with a carbide with S 330  steel shot. 
     
     
         3 . The grinding bit of  claim 1 , wherein the shank and the cutting body are formed of a high-speed steel. 
     
     
         4 . The grinding bit of  claim 1 , further comprising a shoulder surface extending radially outward from the shank between the first shank end and the second shank end. 
     
     
         5 . The grinding bit of  claim 1 , wherein the shank further comprises:
 a first shank portion defining a first diameter and a first height, wherein the first height corresponds to the insertion depth;   a second shank portion interposed between the first shank portion and the cutting body, the second shank portion defining a second diameter and a second height; and   a shoulder surface extending radially outward from the shank proximate to an interface between the first shank portion and the second shank portion.   
     
     
         6 . The grinding bit of  claim 1 , wherein the cutting body defines an annular body having a cutting diameter and a cutting height. 
     
     
         7 . The grinding bit of  claim 6 , wherein:
 the cutting diameter is between approximately 0.5 inches and 1.0 inches, inclusive; and   the cutting height is between approximately 0.125 inches and 0.375 inches, inclusive.   
     
     
         8 . The grinding bit of  claim 5 , wherein:
 the first shank portion is configured for extending into a collet having an end;   the second shank portion has a second portion height between the cutting body and the shoulder; and   the shoulder surface is configured to engage the end of the collet when the first shank is positioned within the collet such that the cutting body is repeatably positionable away from the end of the collet by the second portion height.   
     
     
         9 . The grinding bit of  claim 7 , wherein:
 the first diameter is between approximately 0.25 inches and 0.75 inches, inclusive;   the second diameter is between approximately 0.375 inches and 0.875 inches, inclusive;   the first height is between approximately 1.25 and 1.75 inches, inclusive; and   the second height is between approximately 1.25 and 1.75 inches, inclusive.   
     
     
         10 . The grinding bit of  claim 5 , further comprising a shoulder extending radially from the first portion proximate to the first portion, the shoulder defining a shoulder diameter greater than the first diameter and equal to the second diameter. 
     
     
         11 . A method of using a stepped grinding bit to repair a tread attribute, the method comprising:
 operably coupling the stepped grinding bit to a rotary tool, the stepped grinding bit comprising:
 a shank having a central axis and comprising a first shank end and a second shank end opposite to the first shank end, the first shank end configured for operably coupling to a tool; and 
 a cutting body having a cutting diameter and a cutting height, the cutting body coupled to the second shank end and extending axially away from the shank along the central axis; 
   setting a router speed; and   engaging the tread attribute with the cutting body.   
     
     
         12 . The method of  claim 11 , wherein the shank includes a shoulder surface extending radially away from the shank between the first shank end and the second shank end, the method further comprising operably coupling the stepped grinding bit to the rotary tool such that the shoulder engages a portion of the router. 
     
     
         13 . The method of  claim 1 , wherein the router speed is set between 8,000 and 24,000 rotations per minute, inclusive. 
     
     
         14 . The method of  claim 1 , wherein the cutting body is coated with carbide with S 330  steel shot. 
     
     
         15 . The method of  claim 1 , wherein the shank and the cutting body are formed of a high-speed steel.