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  1. #52
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    That's quite a dip! Neil, what's the degree from horizontal? 5 or 8? or more?

    Quote Originally Posted by Neil Nicholls
    Here's the highlights then:
    Ashaway MicroPower XL at just under 24lb
    zip 1 contains the first minute at 10 second intervals
    zip 2 contains the next 5 minutess at 1 minute intervals
    numbers in the filenames are mmss

  2. #53
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    what I do to "get the creep" out of a string:
    tap the dropweight upwards (minimal) the tiny ammount of extra pull (momentum) stretches the string...then level back horizontally, and tadaaa

  3. #54
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    In the next few days I'm going to try a set up with my scales in, so that the tension loss can be measured. Not on the stringing machine, but the string will be tensioned then clamped.

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    We are eagerly awaiting for your report with bated interest .

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    Actually, the second half of this thread should be cut off and stand on its own. We have completely diverged from the original topic.

  6. #57
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    Quote Originally Posted by Neil Nicholls
    Here's the highlights then:
    Ashaway MicroPower XL at just under 24lb
    zip 1 contains the first minute at 10 second intervals
    zip 2 contains the next 5 minutess at 1 minute intervals
    numbers in the filenames are mmss
    Thanks for the pictures. My suggestion is to put a paper with marks in the back ground so it is easier to see the difference.

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    Thanks Kwun for separating the two topics!!!

  8. #59
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    Default Tension Creep

    Quote Originally Posted by Pete LSD
    We are eagerly awaiting for your report with bated interest .
    Maybe we need another thread titled "Tension Creep".

    Initial experiment re-using the same MicroPower XL from the previous experiment on the stringing machine.

    Attach string to fixed scales at one end.
    Pass string through a fixed block.
    Add weight (dumbbell).
    Clamp string on far side of fixed block.
    Remove weight.

    Time Tension / lb
    0 sec 25
    2 min 24.5
    35 min 24
    2 hr 23.5
    1 day 22.5
    2 days 22
    2+? 21
    2+?+3 20.5

    Being Xmas, I forgot what day I started. After 2 days I left it and forgot about it. Then came back afterwards, and 3 more days later.

    That's more tension loss than I was expecting.
    Maybe the wooden block is a weak point, but I don't think so.
    I can clamp it down some more for next time, just in case.
    Attached Images Attached Images        

  9. #60
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    Neil,

    Thank you for doing this wonderful experiment for us. It is very good info. Don't worry about clamp, the tension might decrease faster if you damage the outer strings. Also, nice bikes. Ride a lot? I don't anymore...

  10. #61
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    Thinking about it, the knot in the string at the scales end could be the weakest link. I'll pull it up tight on the hook next time.

    Fair weather rider mostly. The red one on nice days, the blue one with mudguards for wet days (it's the one I got rebuilt for commuting to work - 36 mile round trip).
    Last edited by Neil Nicholls; 12-30-2006 at 09:58 AM.

  11. #62
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    This is why PROFESSIONALS string their racquets usually the day they play, or the night before. less tension loss.

    obviously, us amateurs don't have that luxury! we pay, they get theirs for free.

    here is a thought about drop weight machines, is it not based on the fact the pulling source is constant? gravity is very constant, should it not be the best pulling source?

    Anyways, hope 2006 was a great year for everyone, 2007 can always be better!!!

    AF

  12. #63
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    Quote Originally Posted by A_F

    here is a thought about drop weight machines, is it not based on the fact the pulling source is constant? gravity is very constant, should it not be the best pulling source?
    A well made drop weight machine should be very consistant, as the gravity does not change from time to time at the same location. However, the major draw back from drop weight is the speed.

  13. #64
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    Quote Originally Posted by LazyBuddy
    However, the major draw back from drop weight is the speed.
    How big a drawback it is depends on how many racquets you want to string and how much time you have.

    If you are a professional stringer it is a major drawback.
    If you only need to do 1 racquet a week, it is a minor drawback.

    This year I almost averaged 2 a week, with a few peaks of 7 a week, and I find the speed quite acceptable (and I'm fairly busy with work,badminton and table tennis).

  14. #65
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    Quote Originally Posted by Neil Nicholls
    How big a drawback it is depends on how many racquets you want to string and how much time you have.

    If you are a professional stringer it is a major drawback.
    If you only need to do 1 racquet a week, it is a minor drawback.

    This year I almost averaged 2 a week, with a few peaks of 7 a week, and I find the speed quite acceptable (and I'm fairly busy with work,badminton and table tennis).
    Very true.

    With my own comparision, a drop weight machine (with the simple string gripper) takes about 15 more min (45 vs. 30) per racket, when compare to crank machine. If you open a pro shop, that's definitely not acceptable, as you will miss out a noticeable percentage of business.

    If just for personal usage (average no more than 2 or 3 per day), then, you can pretty much ignore the difference. Just take a few more minutes, and enjoy the process.

  15. #66
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    here's something from me.
    I had a conversation with a friend of mine about regular dropweights... he said "isn't it annoying that you ahev to get the bar perfectly horizonzal everytime? doens't it take a lot of work?"
    he has a stringway, btw...

    me being a perfectionist when I strign my rackets, I get the bar as perfectly horizontal as I can. tap the weight up a bit (if you tap the weight up slightly you get 10% mroe tension briefly, enough to stretch the string a bit and get the creep out..don't overdo..) and then get it bakc horizontal...

    now the experiment: how good do you have to position your dropweight to get a good tension?

    proces: degree-merusing device (Geo-triangle, if you've heard of it) and stick it on the tensioner, make sure it's level...and start tensioning with a calibrator fixed to it..

    below is the table, I was a bit shocked actually...
    Attached Images Attached Images  

  16. #67
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    Someone in TW forum has done similar test and here is the result...

    ------------------------------------------------------------------
    If you set your reference tension to 60lb and you are off by 10 degrees (above or below horizontal) you are still pulling 59lb of tension. See the table below.


    Degrees From Horizontal.....Percent of Reference Tension.....Resulting Tension (60 lb Ref)
    1.............................................99.9 8%...................................59.99
    2.............................................99.9 4%...................................59.96
    3.............................................99.8 6%...................................59.92
    4.............................................99.7 6%...................................59.85
    5.............................................99.6 2%...................................59.77
    6.............................................99.4 5%...................................59.67
    7.............................................99.2 5%...................................59.55
    8.............................................99.0 3%...................................59.42
    9.............................................98.7 7%...................................59.26
    10...........................................98.48 %...................................59.09
    11...........................................98.16 %...................................58.90
    12...........................................97.81 %...................................58.69
    13...........................................97.44 %...................................58.46
    14...........................................97.03 %...................................58.22
    15...........................................96.59 %...................................57.96

    A dropweight is about as true as a constant pull machine as exists. you don't need electricity, you don't need and fancy electronics

    you will be accurate to +/- 1 lb of reference tension with the arm being off as much as +/- 10 deg from horizontal.

    10 degrees equates to the arm being off horizontal by 3 inches up or 3 inches down assuming the arm is about 18" long.
    -----------------------------------------------------------------------
    Last edited by KooGuy; 01-02-2007 at 09:17 AM.

  17. #68
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    wow..even at 60lbs?
    I noticed (logically) how further the weight is away, the more the degrees off start to matter...
    though even at 60lbs it's still fine...

    good find!

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