or Connect
New Posts  All Forums:Forum Nav:

Cuff alignment.

post #1 of 3
Thread Starter 
I just figured out two ways to align the cuffs. You need the shop tool that measures leg angle for canting to do it. It takes two people, or solo with a big mirror. The benefit is that you can measure something, and so repeat it each time. Takes eyeballing it out of the equation.

1) Have someone mark the middle of the patellar ligament at the top of the tibia. This is the ligament that attaches the knee cap to the tibia.
2) Afix the canting measurement tool to the boot.
3) stand in the boots, bottom buckles done up, cuff buckles loose. Feet have 6-8" gap in between.
4) Measure the knee deflection, and lateral angle for each leg when flexed as if skiing. The lateral angle is the angle that the ski would tilt laterally.
5) Adjust the cuff so that when it is tightened, the measured angles do not change, AND there is equal pressure on either side of the leg.

Another way to get the knee center is to make a big caliper with rubber bands and carpenters squares. Then you can measure the knee when flexed, carefully ensuring that the caliper remains parallel to the ground. Half way is knee center. Best if someone else does it, but you can do it yourself if you have to.

Second way:

Use a plumb bob dropped from knee/ligament center to find where the knee tracks on the boot. Do this with cuffs loose. Mark the position of the bob on the boot with knees flexed. Then adjust the cuff so that when the knee is flexed, it tracks to the exact same place, and there is equal pressure on either side of the leg from the cuff.

This can be done on the floor.

Feet always held with a 6-8" space in between.

Does this sound right? I think the first way is more accurate, but the second ain't to bad.

I am unclear if this process can be done after canting has been completed. Certainly you could flip a second set of shims the other way around to flatten the sole again before doing it....

I also believe that a device can be made with two small balloons connected to a differential pressure gauge. The balloons would be inserted into the boot on either side of the leg at cuff height, and blown up a bit just before closing the cuff. When the differential pressure guage reads zero, the cuff is aligned EXACTLY -- never in error, assuming the balloons are in the right place.
post #2 of 3
Get a copy of The Athletic Skier. Everthing you're asking about is in there. With pictures too.
post #3 of 3
Thread Starter 
Thanks for the tip SLATZ! I'm going to order it ASAP.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Ski Gear Discussion