| Kenneth Michael Guitars est.1978 |
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| KMG "Success Kit" Rim Assembly part 2 Top edge contouring |
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| Misconceptions regarding the guitar rim contouring requirements abound. During the design phase of the KMG kit, a primary concern was our goal to provide a clear explanation along with a simple process, which will net a professional quality contoured guitar rim. I recommend reviewing my article regarding the proper neck set angle. The playability and musical capabilities of a guitar are not an accident, nor should they be results of tedious planned repairs. The above attributes are designed into the guitar, with an understanding of the design requirements along with the proper tools and processes the “KMG Kit” builder will have a distinct advantage over the hit and miss approach to guitar construction. |
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| Our rim contouring process is very similar to the one used at the Martin factory. Note that our kits closely emulate the Martin top and back contouring specifications. The first step is to level the top edge of the rim. Fabricate a 24” sanding board made of 2 ½” wide MDF use 100 or 80 grit paper. We use 3M “77” spray adhesive for this purpose. |
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| The goal here is to make the top edge including rim, kerfing, tail block and neck block perfectly flat and level. |
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| If you have read the neck set article it will be clear to you why the following procedure is necessary. In my view this is the “missing operation/step” in virtually all guitar construction publications. |
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| A 13 ½” x 2 ¾” MDF sanding stick needs to be made use, 80 grit paper. To provide a “bearing” to slide on the top of the mold wrap two layers of reinforced strapping tape on both ends of the sanding stick. Note that the tape is actually on top of the sand paper. |
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| Adjust the rim in the mold so that it is perfectly flush along the top edge. Secure the waist clamp. |
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| Slide the mold off the edge of the bench. Push the rim up from the bottom so it is proud/high off the top of the mold. For the “000 deep body" in these photos the rise is the same thickness of 8 standard 3x5 cards. |
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| Clamp the neck block to the mold maintaining the position of the rim. Note the taper that is formed along the top of the rim back to the waist. |
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| Make sure the mold is clamped to the bench so it is stabilized. Using your special sanding stick with the bearing ends, sand the top of the rim and the neck block flush/level with the top of the mold. |
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| Setting the rim level in the mold reveals the perfect complimentary taper angle that has been formed |
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| KMG "Success Kit" Rim Assembly part 3 Back edge contouring |
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