I recently bought all of Rays tools. I have yet to try the base flatner. For what it is worth here are his instructions:
Instructions for Snowboard Base Flattening
My tools WILL give you the accuracy you desire. My kits can are designed for
maintenance tuning except for deburring for which you will need a stone (you probably
already use one). I say maintenance because my tools are designed to only remove a
minimal amount of material with each tune. I designed them that way to eliminate the
risks of damage from over zealous tuning. If your board is good shape, my tools will
bring them up to spec very quickly and accurately. If a board has been neglected, using
my tools will require extra time and I do mean extra. Particularly base flattening. I
often tell board tuners starting to use my tools to get the base stoneground with the
goal of removing the least amount of material necessary, then do the beveling yourself
assuming there was a bevel in place to start with.
As far as a brand new board is concerned, they should come from the factory with 1
degree on the base and 2 degrees on the sides. If they have 90 on them, better let the
shop rough in the angles first. I say this only to save time for you. Let me explain- a
grind tech should only remove .0002 to .0003 inches per pass of the wheel. A one
degree bevel using this material removal rate will require 5 to 7 passes and you are done.
For the two degrees on the side you need to make twice as many passes of the wheel.
My bevelers require 50 strokes to remove .0003 inches. Remember we are talking about
creating the angle here. For maintenance tuning I have found that the edges sharpen up
with about 10 strokes as maintenance sharpening is done on the side edges only and the
angle is already present. We don't touch the base bevel except to remove burrs unless
you redo the base flattening. Regardless, it is relatively effortless work because the line
contact of the abrasive generates very high cutting pressure.
In tuning a board I need to make you aware of a couple of technique points in base
flattening unique to boards because the tuning tube does not extend across the base
from edge to edge. For a board, RAY'S WAY base flattening begins in the center portion
of the board where only P-tex will be removed. Use my standard flattening instructions
and continue to remove material until you are satisfied but remember to count the
number of strokes because P-tex, being less dense than steel, will be removed 4 times
faster (.0008 to .0010 inches per 50 strokes). Next you should wrap a piece of masking
tape on top of the abrasive at one end of the tube . This end will ride on the P-tex
surface you have just tuned near the center of the board and will prevent any material
removal there. The other end will ride on the steel where you will use 4 times the
number of strokes you used on the P-tex because the steel is denser. This will leave you
with a pefectly flat base, except for the edges which have a bevel angle that you will
then touch up assuming we are talking about a maintenance tune. This step is obviously
repeated on the opposite edge.
Sounds a little wordy but it is really quite easy and straight forward once you get into it
and it doesn't take too long. With very little experience you will know exactly what you
need to do. I usually touch up my skis every weekend and it takes about a half hour
complete with waxing and brushing to open the structure.