Jig for cnc machine

Abstract

A jig for mounting one or more lenses on a two axes coordinate movement bed of a CNC machine for machining the one or more lenses. The jig comprises a carriage ( 29 ) having one or more lens holders ( 36 ) for holding one or more lenses ( 13, 14 ), each lens having a mounting block ( 19 ) bonded to a convex surface of the lens ( 43 ). The carriage ( 29 ) is rotatable about a first axis so as to be able to present one or more lenses ( 13, 14 ) to a tool of the machine where it is desired to machine the one or more lenses ( 13, 14 ). The lens is constrained to restrict rotation of the one or more lenses about an axis normal to the concave ( 42 ) and/or convex ( 43 ) surfaces of the one or more lenses ( 13, 14 ).

1 . A jig for mounting one or more lenses on a two axes coordinate movement bed of a CNC machine for machining the one or more lenses, said jig comprising a carriage having one or more lens holders for holding the one or more lenses, each lens of the one or more lenses having a mounting block bonded to a convex surface of the lens, said carriage being rotatable about a first axis so as to be able to present the one or more lenses to a tool of the machine at a position where it is desired to machine the one or more lenses, each lens being constrained to restrict rotation of the one or more lenses about an axis normal to at least one of a concave surface and a convex surface of the one or more lenses.  
   
   
       2 . A jig according to  claim 1  wherein the CNC machine further comprises a lens cooling means.  
   
   
       3 . A jig according to  claim 2  wherein the carriage is rotatable about a first axis through an angle of 360°.  
   
   
       4 . A jig according to  claim 3  wherein the carriage is rotatable about a first axis through an angle of at least 300°.  
   
   
       5 . A jig according to  claim 1  wherein the mounting block on each lens of the one or more lenses has a spigot, the lens holder has one or more sockets into which the, mounting block fits in a predetermined position, and securing means are provided for holding the spigot in the socket.  
   
   
       6 . A jig according to  claim 5  wherein the securing means comprises a vacuum means for applying a vacuum to an underside of the spigot to hold the spigot in the socket.  
   
   
       7 . A jig according to  claim 5  wherein the mounting block and the lens holder include features that ensure that the spigot does not revolve in the socket.  
   
   
       8 . A jig according to  claim 3  wherein the carriage is mounted in a carrier frame so that the carriage is rotatable about an axis that lies orthogonal to said first axis.  
   
   
       9 . A jig according to  claim 1  wherein the tool is a drill bit for drilling holes through the one or more lenses.  
   
   
       10 . A jig according to  claim 1  wherein the tool is a bit for edging, reshaping and/or cutting the outline of the one or more lenses.  
   
   
       11 . A jig for mounting one or more lenses on a two axes coordinate movement bed of a CNC machine for machining the one or more lenses, said jig comprising a carriage having one or more lens holders for holding the one or more lenses, each lens of the one or more lenses having a mounting block bonded to a convex surface of the lens, said carriage being rotatable about a first axis so as to be able to present the one or more lenses to a tool of the machine at a position where it is desired to machine the one or more lenses, each lens being constrained to restrict rotation of the one or more lenses about an axis normal to at least one of a concave surface and a convex surface of the one or more lenses; wherein the carriage is mounted in a carrier frame so that the carriage is rotatable about an axis that lies orthogonal to said first axis.  
   
   
       12 . A jig according to  claim 11  wherein the CNC machine further comprises a lens cooling means.  
   
   
       13 . A jig according to  claim 11  wherein the carriage is rotatable about a first axis through an angle of 360°.  
   
   
       14 . A jig according to  claim 13  wherein the carriage is rotatable about a first axis through an angle of at least 300°.  
   
   
       15 . A jig according to  claim 11  wherein the mounting block on each lens of the one or more lenses has a spigot, the lens holder has one or more sockets into which the mounting block fits in a predetermined position, and securing means are provided for holding the spigot in the socket.  
   
   
       16 . A jig according to  claim 15  wherein the securing means comprises a vacuum means for applying a vacuum to an underside of the or each spigot to hold the spigot in the socket.  
   
   
       17 . A jig according to  claim 15  wherein the mounting block and the lens holder include features that ensure that the spigot does not revolve in the socket.  
   
   
       18 . A jig according to  claim 11  wherein the tool is a drill bit for drilling holes through the one or more lenses.  
   
   
       19 . A jig according to  claim 11  wherein the tool is a bit for edging, reshaping and/or cutting the outline of the one or more lenses.  
   
   
       20 . A jig for mounting one or more lenses on a two axes coordinate movement bed of a CNC machine for machining the one or more lenses, said jig comprising a carriage having one or more lens holders for holding the one or more lenses, each lens having a mounting block bonded to a convex surface of the lens, said carriage being rotatable about a first axis so as to be able to present the one or more lenses to a tool of the machine at a position where it is desired to machine the one or more lenses, each lens being constrained to restrict rotation of the one or more lenses about an axis normal to at least one of a concave surface and a convex surface of the one or more lenses, wherein the carriage is rotatable about a first axis through an angle of 360°.