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post #1 of 4 (permalink) Old 05-25-2011, 10:59 AM Thread Starter
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Default Makita Router base

HI Everyone

I am currently having a workshop debate and would like other views... the Makita router base has one side flat and the rest of the base appears to be round... although my friend believes it to be an ellipse.... please help answer this question it round ie equal distance to the cutter for all of the base, except the flat part?

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post #2 of 4 (permalink) Old 05-25-2011, 02:51 PM
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Lyn, this should be easy to prove. Trace around the sub base plate on a piece of graph paper. Get one of the give away paint stirring sticks and drive a brad through it, center it in the drawing and make marks on the stick where it meets the drawing outline. Now rotate it and see if the marks stay aligned with the outline. Chances are they will not since the sub base plate may be round but not perfectly centered on the base. This is why centering cones are sold and it is important to center your guide bushings to your bit.

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Last edited by Mike; 05-25-2011 at 03:05 PM.
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post #3 of 4 (permalink) Old 07-16-2011, 03:37 AM
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The base on the router is an alloy casting and not machined to be truly circular and/or centred on the spindle centreline.

Many people use a strip of timber as a guide to route slots in larger sheets etc, or even to cut the sheets to size if chipping is a potential issue. To this they obviously have to offset the strip so that the bit passes through the work in the required location. However establishing the correct offset and maintaining it during the cut can be difficult if the base is not truly circular and centered. The simple solution to this was to cast the base with a long flat along one side that is used as a reference edge when running the unit against a guide. This overcomes the issue of the required offset varying if the base and router are rotated before or during the cut.

Hope this helps explain the reason for the flat spot.
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post #4 of 4 (permalink) Old 07-16-2011, 08:51 AM
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It sounds to me like you are all talking about a couple of points of a mm which with wood is of no consequence. When I'm routing around templates with my Makita 3612C I rotate it around the curves. Please check out my numerous routing projects in my uploads and point out to me the errors that are caused by doing these things with a stock standard router. If we were dealing with metal it would be a different matter.


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