Note: The deck height must be correct before using this fixture to cut rail grove. The PRC fixture is used for two steps
1) Cutting the rail grove 2) frame thinning. First test fit your frame to the PRC car if it fits and is flush in the channel then your good to go. If not you will need to thin the frame first. Thin the frame down to .755 just enough for the frame to be mounted flush to the CAR. See step 2 instructions.
Step 1) Cutting in the rail grove (AFTER DECKING)
If the PRC is mounted in a vise make sure it’s low on the fixture to not impede free movement of the car it should turn by hand when in the vise. To set up the PRC run the CAR to the end of the fixture. Install the adjustment knobs to both sides. Make sure the cutting blades are back enough for the frame to be mounted. Adjusting the cutting blade’s when cutting never turn more the 1/8 turn per cutting pass. Each 1/8 turn will be .0015” deep as you get close to your final dimension. Taking 1/8 of a turn will help eliminate any chatter.
Mount your 1911 frame to the CAR with the longer supplied hardware and aluminum plug. When bolting your frame down make sure the bolt does not hit the threaded shaft underneath. To verify the shaft will turn freely by hand after the frame is tightened down to CAR. Make sure the frame sits down in the grove no gaps. The bolt needs to be tight but not too tight. To zero the blades to the frame turn each adjustment knob until it touches the frame on both sides you will feel it stop. At this point you do not want to loosen the adjustment knobs during cutting keep constant contact with the blade. You will only need to tighten before a cutting pass (DO NOT OPEN TO RETURN THE CAR). Take note of the white dots and each location they might be different.
When using a cordless drill always cut in low speed. You can return on Hi spreed if you want. Use cutting oil on the frame and the blades. Run the CAR forward until the frame passes through the cutting heads to the start position. Reapply oil with every full turn of the adjustment knobs. Remove cutting chips every few passes even when in the grease. This will insure your PRC will cut many frames. Do not adjust blades just yet. From the starting position run the CAR forward and see if the cutters are actually touching the frame. If correct the first pass through should have put a little even scratch on both sides. Double check that the frame is square to the cutting head and move the car forward to the starting position to begin cutting. Cutting time..... From your Zero point tighten each adjust knob 1/8 turn. Now run the car forward you should feel and hear it cutting. You should have cut an even grove on both sides of the frame all the way down. Return the car back to the start position and tighten each knob 1/8 turn. Run the car forward again and start cutting you should have .003 deep groves on both sides of the frame at this point. You can measure the frame while still mounted to ensure how much your removing plus measure each side to verify your centered. If the left and right are even proceed to your final dimension.