Just a little tip about board thickness

[djarboe]

I wanted to pass this along. I made two sets of coasters with team logos. I made these out of shorter material, so I used rails on the sides to meet the 7 inch rule.

The first set was made from 1/2" thick material. Although I didn't notice it until spraying with urethane, but there is a gradual ridge which I attributed to the point where the leading edge of the board got under the forward roller.

The second set was made from 5/8" material, and there is no ridge.

Apparently, there is just enough flex in the thinner board that it must be raised up a little when the board is not under the roller. The thicker material must be a bit more rigid and does not seem to have this problem.

Just something to keep in mind.

[Digitalwoodshop]

Good observation... :)

[bergerud]

How wide were the rails? Are you sure the 1/2" board was not warped?

[djarboe]

How wide were the rails? Are you sure the 1/2" board was not warped?

The rails are about 5/8" wide. I did check the board visually looking down the board. I attach the rails with carpet tape, but have always done this. I put a strip of tape at each end of the board edge and in the center. Then I clamp rails in place really tight, and let it set at least overnight.

It just seems odd that this only occurred on the 1/2" stock.