Whats the best way to measure bottom concave?
So far I’ve got a plastic dial caliper duct taped to a straight edge(metal yard stick) such that the depth gauge portion is used
to measure concave…works!
I tried this with a metal dial caliper and the whole thing taped together was too flimsy and unreliable.
A straight piece of wood and a square for me. The wood to span the concave(s) and the square as a depth gauge.
I just lay a level across the board and meaure the gap with a tape measure. Hope this helps.
i do it the same way- straightedge rail to rail and measuring the gap with what ever tool is in site…
when measuring v bottom you lay the straightedge on one rail and stringer and measure the gap on the other rail.
devide it by 2 and you got the Vee depth.
Like others - a straight edge from rail to rail but then I use a wedge shaped piece of wood I slide under the straight edge, mark it and take it out and measure it. Also I use pennies - they’re 1/16" thick.
I do a similar thing, but I use square aluminium tube because it is more regular shape. I use calipers to measure from the top of the bar to the deck and then subtract the thickness of the bar (or zero the caliper at bar thickness). Easier to get an accurate measurement.
Inch markings on the bar make it easy to profile the concave by taking multiple measures out towards the rail.
If the stringer is higher than the rails I glue short pieces of tube on at the ends to give the measurement tube double height at the rails. They lift the measurement tube up so it doesn’t rock on the vee.
I do a similar thing, but I use square aluminium tube because it is more regular shape. I use calipers to measure from the top of the bar to the deck and then subtract the thickness of the bar (or zero the caliper at bar thickness). Easier to get an accurate measurement.
Inch markings on the bar make it easy to profile the concave by taking multiple measures out towards the rail.
If the stringer is higher than the rails I glue short pieces of tube on at the ends to give the measurement tube double height at the rails. They lift the measurement tube up so it doesn’t rock on the vee.
Bingo! Thats all the way around better than what I’m doing.
I do a similar thing, but I use square aluminium tube because it is more regular shape. I use calipers to measure from the top of the bar to the deck and then subtract the thickness of the bar (or zero the caliper at bar thickness). Easier to get an accurate measurement.
Inch markings on the bar make it easy to profile the concave by taking multiple measures out towards the rail.
If the stringer is higher than the rails I glue short pieces of tube on at the ends to give the measurement tube double height at the rails. They lift the measurement tube up so it doesn’t rock on the vee.