Bosch PR20EVSK User Manual download pdf (Page 23)

www.ModulusArms.com

October 20, 2014

www.ModulusArms.com | AR-308 Jig Instructions

o This jig has been tested with a number of different routers.

 Mini-Mill

o A mini-mill with a Modulus Arms jig in a machine vise can be used. The x-y table offers

additional control, improved surface finish, increased speed, and reduce fatigue.

o Start with the end mill in a drill hole and start the mill. Slowly move table front and back

without touching the jig wall to cut a slot. This must be done at a slow feed speed since the

end mill is cutting on both sides.

o Cut either toward the front or back without touching the jig wall, then move front to back

removing more material (should be done in about two passes on each side of the starting

channel).

o Carefully control both the x and y to generate a light pressure against the template for the

final pass.

 General Guidelines and Recommendations

o The user should start with a shallow depth of cut to gain experience before increasing the

depth of cut to a comfortable level that should never exceed ¼”.

 Variable speed router is high recommended when approach the maximum depth.

The lower end mill speed allows for greater control

o If the end mill has larger than a 1” cutting surface, the

first few passes need to be made

without the end mill touching the end of the jig. Only once the cutting surfaces have cleared

the jig, should the end mill touch the template edges to obtain the proper finished

dimensions.

o The end mill when working properly will feel like its cutting through butter. When the effort

increases, it is possible the flutes are clogged with metal. This can be removed with a small

pair of needle nose pliers.

o The clogging effect can be reduced by

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Bosch PR20EVSK User Manual Page 23