Machining Copper/Silver Tungsten


In the application of Copper Tungsten for various electrodes and fixtures the following are recommended practices for machining materials into their final shapes:


Cutting Tools:

     -Carbaloy 883 or equivalent
     -Grind tools with 0 degree rake, 8-12 degree clearance, and .010 to .125" nose                radius.  The nose radius can increase with the size of the work.
     -Suggest resting stone on work when honing the tool.


Turning and Boring:

     -Roughing                     0.030" depth of cut
                                           0.020" feed
     -Finishing                      0.002 to 0.005" depth of cut
                                           0.001 to 0.002" feed
     -Turning speed             300 surface feet per minute
                                            Do not use lubricants or coolant

Shaping

     -Tool speed                  43" per minute
     -Depth of cut                 0.030"
     -Feed                             0.020" per stroke


Milling

     -Parameters                   0.5" wide x (up to) 0.6" deep cut
     -Spindle speed              395 RPM
     -Table feed                     8" per minute


Grinding

     Use 80 grit resin bonded wheels of medium hardness.  0.015" per pass.

Drilling and tapping

     Use carbide micro-grain drills for best result.  Use spiral point taps.  Coated taps are recommended.  Rigidity is important.


The information provided is for use only as a guide!!!