Reply To: Holdfast used with Douglas fir
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My five year experience from a workbench made from 3¾” thick glulam (spruce) is that the first 3″ of the front should have been FAS beech (usually straight and knot free).
The holdfasts have widened the dog holes enough to have an impact on the bench dogs, and securing hold downs. I repaired the holes first enlarging them, inserting pieces of oak, and then re-drilling new ¾” holes. After six months of use, the holdfasts have not had any effect on the the bench holes.
Secondly, with use and wear, the front to edge corner is no longer very sharp. The angle is still overall 90°, but too rounded over to use the edge as a fence support when planing grooves and rebates.
The part of the bench occupied by the tail wise is in beech, with no changes whatsoever.