Saturday, January 5, 2013

Pi Tape ( Diameter tape )


Pi tape or "diameter tape "Is a tool I recently found on line to add to trouble shooting reels before grinding .In the past I have tried measuring the land x 2 plus diameter of shaft to check for tapering and wear . It is very hard to do it this way and not as accurate as I would like it to be . 
I found this one on line fairly cheap . One side of tape is linuar measuring the other is the Pi tape.

The measurment shows the diameter in inches... just shy of 5 "
It's very easy to do and very accurate . Remove or loosen bedbar of reel . Feed the tape around reel and check the measurements . It's so easy to see now if the reel is tapered or at the wear limit . Wear limit for this Toro 3150 Q greenmaster reel is 4.5 " This reel is fairly new as you can tell from the tape . When setting up the reel on the foley I can now double check if it's grinding a little harder on one end off the reel after set up . It's going to eliminate any guess work especially at the lower heights of cut ( HOC )on greens.


  1. Thanks! I have been looking for a good way to check this!

  2. How close do you want each side to be for you to consider it good? Within 1/16” of each other...? I have same tape and bernhard Express Dual. I have a reel within 1/16” of each other from side to side. Trying to get it out with grinder but takes a while. Not sure if it’s worth it. Thanks!

  3. Bernhard has these great videos too . If its a mower cutting at a Higher HOC you might not notice it in the after cut . If its a JD unit the front rollers have cams so you can square it up to the reel . 1/16" seems a lot .do you regularly grind and set up reels often? and do you backlap a lot .Greens mowers at lower HOC you may not get away with that much coning . That's probably 6 times what it should be . Pretty sure 10 thousands difference is the allowable amount .

  4. copy paste link to get it to work .

    1. Thanks bob. I’ll take a look. And my mistake. Not 1/16”. 1/64”

    2. 1/64 I wouldn’t be to concerned about .