https://www.homemadetools.net/forum/radial-arm-saw-fence-new-design-39532
"The new fence design used a “sandwich” of MDF - aluminum extrusion - MDF. This provided some useful benefits."
"Both the front piece of MDF (I suppose it could be called a sub-fence) and the aluminum extrusion could be moved and positioned separately. The extruded fence is held in the desired position with captive bolts and the sub-fence is held in place by cap screws. The piece of MDF at the back of the extrusion was the part of the fence that remained clamped to the table (and held the whole fence in place)."
"As you can see in the image (below), the fence can be positioned to suit the angle being cut and the sub-fence could also be “closed” to allow the (MDF) sub-fence to be cut at the angle to which the arm was set, thus creating a zero clearance for the blade at that desired angle.
The extrusion was never cut. The extrusion was only re-positioned conveniently close to the blade to provide strengthening support to the MDF sub-fence.
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