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Thread: Drop Weight Vs. Crank
12-11-2006, 01:17 AM #18
A crank machine may be out of calibration by say 2lbs, in which the reading says 30lbs but the out of calibration tension is actually 28lbs. Precise tension on every pull means you get 28lbs on every pull. It doesn't mean you must get 30lbs. Drop-weight machines would have varying tension for each drop.
12-11-2006, 01:46 AM #19Originally Posted by taneepak
12-11-2006, 03:02 AM #20Originally Posted by taneepak
But varying by how much?
If you get the bar exactly horizontal, you get 100% of your reference tension.
If you are 5 degrees out, you get 99.62% of your reference tension.
If you are 10 degrees out, you get 98.48% of your reference tension.
reference = 24 lb
5 degrees out -> 23.909 lb
10 degrees out -> 23.635 lb
On a 12 inch bar, 5 degrees out is 1 inch above or below at the far end of the bar.
I doubt if my bar is ever more than 1cm out of horizontal, which is about 1.9 degrees.
If you are 1.9 degrees out, you get 99.945% of your reference tension.
1.9 degrees out -> 23.987 lb
12-11-2006, 06:26 AM #21Originally Posted by taneepak
The only way to avoid the creep is a constant pull machine.
12-11-2006, 08:15 AM #22Originally Posted by Matt
12-11-2006, 09:42 AM #23Originally Posted by taneepak
Alos, I would like to point out that as you posted, reference tension says 30lb and you are getting 28lb. It might be OK for yourself, is it OK for your customer (or friend) when they requested 30lb? This is what I worry about when I use different stringing service because you can not be sure you get the same tension from 1 stringer to another.
12-11-2006, 11:29 AM #24Originally Posted by silentheart
Further more, the "pull" is not the only step to determine the final tension. For crank machine, the "pull" might be consistant, but after count in the lost tension (e.g. where and hot tight you place the clamp) will result in different tension for each piece, as crank is not constant pulling machine.
For drop weight, it's the opposite. Yes, maybe each pull might have small variance, but since it's a constant pulling machine, you can "re-adjust" the last 1-2 piece of string if you let the leveler sit for several more seconds. Therefore, with the adjustment, the difference in final result is very much minimized.
12-11-2006, 07:24 PM #25
Some stringing machine manufacturers make only drop-weight machines or only crank machines. Very few make the complete range of drop-weight, crank, and electronic machines. I believe manufacturers of the complete range will not claim that the drop-weight delivers precise tension with each pull, but they will claim that for the crank and the electronic.
12-11-2006, 07:56 PM #26Originally Posted by taneepak
12-11-2006, 08:12 PM #27Originally Posted by taneepak
12-11-2006, 11:42 PM #28Originally Posted by LazyBuddy
What I meant more about consistency is that I want the stringing to be done on the same stringing machine. This is because in the past, when wanted my racket to be stringed at tension X, the sound (the note to be exact, since I do know music) was inconsistent as the racket sounded low, or sometimes high. I kept adjusting the tension numbers to figure out why this was happening.
It was later determined that, the racket was not being stringed on the same stringing machine, as sometimes it was done on the crank and sometimes the electronic which would explain the inconsistencies. The simple solution is to have the rackets done on the same machine, and as a result, the sound matches the tension which I asked for.
So, if I wanted my rackets to be stringed on the electronic, I’ll have to figure out the sound tension equivalency on each machine, since have a Prince and Babolat electronic machines.
Last edited by Matt; 12-11-2006 at 11:46 PM.
12-12-2006, 01:46 AM #29Originally Posted by LazyBuddy
12-12-2006, 07:45 PM #30
If you think about it the use of the words "constant pull" is confusing. Perhaps there is no such thing and is simply used, wrongly, to mean the pull is continuous for only the time between reaching the desired tension and the clamping of the clamp. Now what happens after the clamping? Whether it is crank, drop-weight, or electronic, the same after clamping dynamics apply. In fact in the time to get ready for the next pull-the faster, more uniform, and shorter the pull the better-the dropweight is the slowest. Using a tennis drop-weight machine for badminton racquets makes it even worse-longer string to pull and a longer in-between pulls. A tension drop-out, whether at reaching the desired tension (as in the crank) or when clamping the clamp, is still a tension drop-out, for all types of machines. Where then is the "constant pull"?
12-12-2006, 08:14 PM #31
Why are you even talking about the time between after clamping and the next pull? This is a non issue.
12-12-2006, 08:31 PM #32Originally Posted by Pete LSD
12-12-2006, 08:33 PM #33
The machine doesn't spend 90% of its time in between pulling time: more like 5 seconds from clamping to retensioning.
Most of the time spent is waiting for the string under tension to stretchhhhhhhhhh and stretchhhhhhhhhhhhhhhhhhhh until it doesn't stretch or the stringer get sick and tire of waiting.
Originally Posted by taneepak
Last edited by Pete LSD; 12-12-2006 at 08:47 PM.
12-12-2006, 10:05 PM #34Originally Posted by taneepak
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