Blanks with concave already in them?

General Discussion
1

I just picked up a 6’3 Teccel blank today. Seems to already have single concave running through it. Whats that all about? It’s only my 3rd blank, but i’ve never noticed anything like that before…

2

gee, bit of a bummer if you where planning to shape a different contour into the bottom…

3

it can be fixed, but i’m curious the same.

4

It’s one of two things.

Could be by design, as 90% of the boards to be shaped from that blank will have concave.

Could be ‘‘cupping’’ from the stringer glue-up.

Mike

5

so true. that is why I like to put my own stringers in. or no stringer.

6

sucks. looks like i’ll just plane down those edges first.

i don’t know how i missed it when i was checking it out at the warehouse.

7

…there s some plugs that have concaves

yes the 63M has

start with flat bottom then single concave then flat

if you dont want that, pass the planer 2 times near the rails then 2 more passes beside these ones

no more concave

8

I thought I read in one of the blanks catalogs that the concave already in the blank somehow aids with machine shaping.

I’ll see if I can hunt it down…