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.

Minutes May 10/11

Most recent meeting minutes:

Attendance Naq, Paul, J Hiltz, Miles, Chris, Peter, Mike, Robert, Chris

Leo showed how to repair broken bowl blanks using wood clamp jigs epoxied to the round sides of the wood.
Leo described how wood dries out naturally and by Kiln.
Air drying can get to around 12% moisture but rarely lower.
Kiln dry can go down to 6%.
Moisture content of ambient wood around the shop..ie after years is around 8% on average.

Jim Hiltz demonstrated the McNaughton coring system on a large blank.

May10/11 meeting