Calibrating a crank

Discussion in 'Stringing Techniques / Stringing Machines' started by jhutch, Jul 31, 2010.

  1. jhutch

    jhutch Rookie

    Joined:
    May 20, 2010
    Messages:
    200
    I am wodering if you can calibrate a crank so that 58 lbs on the crank lockout is equal to 58 lbs a constant pull machine such as a dropweight. I am ultimatly looking at getting the alpha pioneer dc + or the revo. I'm leaning towards the dc + because I don't want to mess around matching different strings to different tensions.

    Thank you!
     
    #1
  2. dancraig

    dancraig Hall of Fame

    Joined:
    May 24, 2005
    Messages:
    3,239
    Add a few pounds to the crank.
     
    #2
  3. Irvin

    Irvin G.O.A.T.

    Joined:
    Mar 15, 2007
    Messages:
    12,296
    Location:
    Marietta, Ga
    How much more a constant pull tensioner pulls than a lockout depend on how much the string stretches and how fast you clamp off the string. I think too much is made out of the constant pull machines but that does no mean they aren't good.

    Irvin
     
    #3
  4. jhutch

    jhutch Rookie

    Joined:
    May 20, 2010
    Messages:
    200
    so if i clamp the string quick on a lockout it should be more accurate?
     
    #4
  5. Irvin

    Irvin G.O.A.T.

    Joined:
    Mar 15, 2007
    Messages:
    12,296
    Location:
    Marietta, Ga
    No it should not make a difference. You are thinging too much.

    Irvin
     
    #5
  6. Ash_Smith

    Ash_Smith Hall of Fame

    Joined:
    Jan 18, 2005
    Messages:
    3,941
    Location:
    A green and pleasant land
    Don't calibrate any differently just use the 10% guide. In other words if somebody comes to you having previously had their racquet strung at 50lbs on a constant pull machine you'll string it at 55 on your crank. If you calibrate 'up' then anybody you usually has their racquet strung on a crank will find the strigbed too stiff when it comes off of your machine.

    On experience when having to switch from CP to crank back-up mid event we've found 10% the be more or less right for most players.

    Ash
     
    #6
  7. jhutch

    jhutch Rookie

    Joined:
    May 20, 2010
    Messages:
    200
    thanks guys
     
    #7
  8. RogerRacket111

    RogerRacket111 Semi-Pro

    Joined:
    Apr 8, 2010
    Messages:
    708
    Constant pull is over-rated. Honestly do you think a human is not capable of doing a constant pull that a motor of some kind with some electronics can? There are many factors including strings, friction of the strings on the frame. String tension and bed frame tension are quite different. Its a matter of being able to reproduce consistently and fine tuning.
     
    #8

Share This Page