Minutes

Paul, Robert, Peter, Mike, wilson, Jimmy MacLean, J Hiltz, Miles, Chris

Leo went over the use of the acrylic concrete bond and how to use it for painted surfaces:
Apply it as a prime coat
Apply paint right away right over the wet acrylic
Let dry and you can add a second coat of the paint for a good finish
One can use fillers wth this acrylic to fill voids.
If the void is in a wet area, use Portland cement as this will dry in wet environment.
Else use Lime (fertilizer) as a filler if the area being filled is in a dry envoronment.

Leo then discussed how the kiln process works.
To get precise measurements of moisture content:
Cut off an end sample of the stock;
Bake it in an oven and periodically weigh it untill there is no change in weight;
It is then 100% dry
Eg first weight was 2 pounds, finish weight is 1 pound, then 1 pound of water was removed.
If you want , say 10% moisture content, stop the drying process before it gets to a weight of 1 pound, ie the weight will be one 1.1 pounds(10% of one pound is 0.1 pounds, which is 1.6 ounces)
CASE HARDENING

Case hardening is a condition of internal stress in wood due most commonly to overly rapid drying and/or improper conditioning after drying. A casehardened board cannot be visually distinguished from any other board, but they can be VERY dangerous in rip-sawing, particularly with radial arm saw (ANY ripping with a RAS is somewhat dangerous). What happens is that the stresses cause the saw kerf to close up and bind against the blade on the outfeed side. On a table saw this can cause kickback and on a RAW it can cause kickback AND it can also cause the plank to rise up on the outfeed side of the cut and get chewed up instead of making a clean cut. By cutting off a small sample piece and bandsawing a long slot along the grain as shown below, you can tell whether or not a plank is case hardened, BUT ... be aware that case hardening is very localized, so testing one end of a plank doesn't tell you anything about the middle or the other end.



Most kiln dried wood will be around 6% moisture content
Leo gave each of us a bowl blank to make something.
We decided to do a session on lacquer spray and stain technique next.