On Sat, 17 Dec 2005 08:08:28 GMT, Ryan Cousineau <[email hidden]>
Quoted message said:Quoted message said:I'm still working to develop a method for quickly cutting the tires
into belt blanks. Because of the molded crown and bias of the casing,
they don't lend themselves to cutting with a knife and straight edge.
I'm thinking rollers and rotary cutter blades might do it, but trying
to keep it more simple than that. There probably already exists a
machine that does it, I've just not seen one yet.
I'll eventually get something worked out. That's half the fun.
Reverse-engineer the easiest way to get a flat tire: lubricate your
knife. I recommend either water or oil.
Lubrication helps but doesn't solve the problem of flattening the
tire's crown so that a straight edge will lay flat. I used to strip
wet rubber for model aircraft motors. That was easy with the rotary
blade in a "rubber stripper" as you've a nice initial straight side
for positioning a fence to guide it through the cutter. Optimally I
hope to cut both sides of the tread away from the sidewall
simultaneously and parallel.
The best I've been able to accomplish for flattening the crown is
stapling the tire to a plank about every three inches and
repositioning the straight edge before cutting the other side. It
takes about as much time as with a scissors following a molded line.
I'm working on some adjustable (tires and buckles come in different
widths) two blade cutters that permit me to draw the tire through the
blades. Tension must be kept equal on the take-up side for both the
off-cuts and tread section or you get a wavy line. Downward pressure
has to be sufficient to flatten the crown where it passes through the
blades while not causing so much pressure that it's impossible to
pull the rubber through the blades. Something about the thickness of
plane or chisel blades are necessary to keep the blades from
deflecting and producing a wavy line. . . even with wet rubber.
Like I said, it's fun.
BTW: Nokian tires _are_ tough with a capital tee.
--
zk