Rocker Cutter Fixture (70042)
Patent Pending

The Rocker Cutter Fixture was designed to be installed in a common machine vise attached to table of a vertical milling machine.  Although it has been successfully used in a drill press making small cuts, it is not recommended.

 


Align ruler with outer diameter edge of valve

spring and mark line on rocker arm for

reference. 

Visually align mark on rocker arm (A) with centerline of spindle (B) while installing fixture in vise.

Stud # 2 may need to be substituted for one to fit your rocker arm. Fixture uses common screw in stud. Lock nuts supplied with rockers can sometimes be used to attach rocker by rotating the fulcrum up side down. Washers # 10 can sometimes be added to raise stud for extra length.

Rocker arm cannot contact stud on radius.
Optional Studs                    E          D inches
70050 Stud                        3/8    1.900
70054 Stud ( with kit )          7/16   2.070
70056 Stud                       7/16   3.000

Loosen screws # 9 allowing front shaft # 6 to move freely. Adjust front shaft # 6 to allow rocker arm to rest against stop # 7 while being centered on centerline of fixture. Tighten screws # 9 after adjusting. Tighten nut # 4 clamping rocker arm to fixture.
Align the center line of cutting spindle with centerline of rocker arm on fixture. Always rotate the cutter in direction to push against rotation stop # 7

Cutting diameter of .025 in. larger than valve spring is generally recommended. Make trial cut for depth and location of cut.

Be conservative on first cut.

Remove rocker arm and test on engine for fit and machine more if necessary. Once desired cut has been made set stops on machine for depth and location of cut. After this is done remaining rockers can be cut in one step to duplicate first cut on rocker arm.