Very Long Pivot Fence - Router Forums
 
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post #1 of 3 (permalink) Old 01-12-2009, 06:50 AM Thread Starter
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Default Very Long Pivot Fence

I have a utility workbench which extends along an entire side of my workshop so there is no side access at either end 28” (700mm) deep x 16’ 7” (5100mm) long. It has a built-up ply top approx 3”(75mm) thick smooth enough for a router table top. Into this bench I have inserted a woodpecker unilift. I am using a 2000m long fence pivoted at 2000mm from the free end with the router bit at1600mm from the free end. So this gives me a 5 to 1 scale advantage i.e. 5mm rotation at the free end gives 1mm movement at the bit. Now here’s the interesting part of my story:-
There’s a programme downlodable free from the internet for use with a pivot fence which appears to get to the bottom of the pivot fence problem ie how to control actual movement at the bit. The programme produces a scaled A4 printout of the actual movement at the bit based on distance from bit to an arbitrary baseline and the distance from the pivot point to the same baseline at the end of the fence. You then tape the printout to the table and pivot the fence according to the scale. With the above fence layout and using this programme (which comes with full pdf instructions) I can achieve accuracy to 1/100” (0.20mm). You can find the programme called RouterScale at tunelabworld.com.
I haven’t actually set this up yet but would like to hear the comments of the experts out there before I comit..
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post #2 of 3 (permalink) Old 01-12-2009, 07:28 AM
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Thanks for the link! This program will come in handy for a miterfence project I'm workin on.
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post #3 of 3 (permalink) Old 01-12-2009, 07:41 AM
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It sounds interesting but I think is iss maaing a mountain out of a molehill. I have pivot fences and I have fences with dula scales. I dont use either for setting the fence for any operation. Most bit require you to set off the bearing or the cutting edge. Where you have to make repetitive adjustments, a small lead pencil mark on the table works well.
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