Bosch PR20EVSK User Manual download pdf (Page 11)

www.ModulusArms.com

October 20, 2014

www.ModulusArms.com | AR-308 Jig Instructions

Trigger Slot Milling: A router and ¼” end mill is used to fabricate the trigger slot (figure 1.4, left) and the

completed trigger slot is shown in figure 1.5, right.

1. In figure 1.4 (middle) the end mill depth is adjust to the 1

template hash mark. This represents

the top of the lower. The maximum depth of cut is the distance between two hash marks.

Modulus Arms suggests that the user starts below this level and work up to a comfortable depth

of cut that never exceeds the maximum depth of cut.

2. Insert the end mill through the template and into either drill hole formed earlier. Make sure the

end mill does not touch the wall of the drill hole. Carefully turn on the router and allow the

router to come up to full speed.

3. With firm downward pressure applied to the base, mill using shallow clockwise passes with light

pressure. The 1

goal is the make shallow clockwise passes is to

first adjoin the two holes. Next,

with light clockwise passes, widen until the end mill touches the side of the template. Turn off

the router, wait until the end mill stops spinning, and remove from the jig. Figure 1.5, left shows

the lower after the

first pass.

4. Increase the cutting depth using depth gauge as a guide and repeat steps #2 and #3 until the

end mill breaks out of the bottom of the lower. The “A” depth gauge can be used to set the final

depth as shown in figure 1.4, right.

Figure 1.4: Router to mill out trigger-slot ¼” at a time (left) and final cut depth set with “A” depth gauge

Figure 1.5: Example of partially milled trigger slot (left) and complete trigger slot (right)

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Bosch PR20EVSK User Manual Page 11