serrano help

Discussion in 'Stringing Techniques / Stringing Machines' started by matell, Jul 2, 2008.

  1. matell

    matell New User

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    Hi all you old school stringers. I just acquired a serrano UV-550 stringer. While everything works fine, I can't figure out how to properly tension the string, given synthetic string stretch. On previous string jobs using a ratcheting drop weight system, after the bar dropped below horizontal, I've held the string grabber and ratcheted the bar back up, repeating until it levels out. How do you do this on the serrano without a ratcheting mechanism? Do you simply tension once, clamp, and then tension again until the bar doesn't completely drop? Much thanks,
    matt
     
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  2. Mansewerz

    Mansewerz Legend

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    You just give or take some slack and re-drop.
     
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  3. matell

    matell New User

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    I understand the idea of getting rid of the slack and pulling again, but I can't seem to get rid of enough slack (I'm even clamping after each pull). Each drop continues to go all the way down. My sense it that I am stretching the string between the racquet and gripping mechanism (including around the gripper), and doing relatively little on the string within the racquet. Is there a key to wrapping the string on the gripper? I am wrapping around the outside twice, and then feeding through the middle and clamping.

    thanks
    matt
     
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  4. Mansewerz

    Mansewerz Legend

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    Hmm, perhaps the string doesn't stretch enough to put enough slack in? Klippermate users are needed!
     
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  5. matell

    matell New User

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    My problem is the string stretches too much, not that it stretches too little I understand to grip the string with more slack if the bar isn't down far enough. In my case, the bar drops all the way, even when I grab the string as close to the racquet as possible, and without any obvious slack. I simply need to know how to hold tension while trying to take up the slack.

    matt
     
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  6. jim e

    jim e Hall of Fame

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    I have a serrano UV 550,(I purchased it in 1968 ) on mine it is a foot pedal bar, and once I step on the pedal , I clamp with the tension clamp, and release the foot pedal, and the weight should not drop all the way to the floor, no need to have anything horizontal, just need to be sure that the weight does not go to floor to bottom out, which I rarely ever encountered.Not sure what your exact question is?Once you clamp with the tension clamp and release the foot pedal, it stops dropping once the proper tension is reached, clamp string, release tension, thats it, only need to tension once.Very reliable machine, I just never got the updates for larger frames,(no longer avail.) so I ended up getting a newer machine, now that I am back stringing.Still have the old serrano.
    I hope this answers your question, as I really don't know the exact nature of the question, as there is no ratchet, or bar to level as you were referring to? Just be sure that the pedal bar does not drop all the way down, but that is usually very rare, as long as you place the string in the tension clamp and not leave a great amount of slack on it, that should not be a problem.You can even slide the tension clamp closer to the table, clamp, and then slide the tension clamp back to take up even more slack, then release the pedal, but all that really should not be necessary.
    Let me know if any other questions, as years ago, I strung a good # of racquets on this old machine.(mostly woodies, and T-2000's, and a few odd ball racquets now and then, as that was all there was at that time)
     
    Last edited: Jul 2, 2008
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  7. matell

    matell New User

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    Hi Jim - I've seen your previous posts...I was hoping you would write. The model I have is the one shown in this picture - http://www.photostringer.com/serrano_UV550_01.htm

    Are you sure that so long as the bar doesn't drop all the way, the racquet is properly tensioned? When using other dropweight stringers, I thought it was important to get the bar close to horizontal. Does the serrano somehow overcome this issue, so long as it isn't bottomed out?

    Also...what do you mean, that you step on the pedal, clamp the tension clamp, and then release the pedal. Do you mean you step on the pedal, then wrap the string around the string gripper, and then clamp the string with the fixed clamps once you get proper tension (i.e. when the bar settles above floor)? This is what I have been doing, but perhaps I am wrapping the string incorrectly around the gripper, as I am finding that the bar goes to the floor at least once, but sometimes 3-4 times at certain parts of the racquet when stringing with a synthetic that stretches a lot (ultimatum by silent partner). I was told by the guy I bought the stringer from that you take the string and wrap it twice around the outside of the gripper, then pass it through the center, and tighten. As I wrote in previous posts, after tensioning, and having the bar drop to the floor, I clamp the string with a fixed clamp, take up the slack, and then repeat. However, in some cases, the slack disappears when I loosen the string gripper, despite the fact that I have it clamped at the edge of the racquet...thus i think that I am primarily tensioning the string between the racquet and the gripper, and it just returns to an unstretched state upon loosening the gripper. I found that sometimes, I could deal with this by wrapping around the gripper in the other direction, and in one case I was only able to overcome this by putting the string through the gripper, then wrapping it, and then passing it through again.

    Please let me know if you have any thoughts on any of these questions. The serrano seems like a nice stringer...providing an aesthetically pleasing experience...if only I could deal with these lingering issues.

    thanks
    matt
     
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  8. jim e

    jim e Hall of Fame

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    As long as the weight bar does not drop to the floor to bottom out you are properly tensioned.There is no horizontal issue with this machine at all.The machine takes care of all that. My machine is one of the early models, and the tension gripper only has a opening you place the string into, and close with the lever to tightness that holds it properly, that amount of that you close with, after a while, comes without even thinking about once you get use to it, yours looks different than mine, as I said, mine is an old early version, maybe Steve will jump in here as his may be like yours. below is picture of mine, and you can see the tension gripper is different than yours.There is no wrapping around on this model.Maybe you need to adjust the clamp to hold more?The bar very seldom if ever dropped all the way down, it must be your tension gripper that is what the problem is. From your pictures it looks like that you have the updates for the larger frames! I wish that I had those as well, no longer avail.
    [​IMG]
     
    Last edited: Jul 2, 2008
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  9. Il Mostro

    Il Mostro Banned

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    That is a very interesting looking machine. Seriously medieval -- but in a really good way.
     
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  10. jim e

    jim e Hall of Fame

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    It did its job back then! Did a lot of racquets on that machine! The clamps were not adjustable for gauges like todays are, you turned the handle on the clamps till it held the string sufficiently, same thing with the tension clamp, but after a while it was easy to go through and don't even have to think what you do.Also there was not a whole lot of stringing patterns back then, most woodies were similar, and then the popular T-2000's back then were the most. (Strung a lot of natural gut back then, everybody asked for that back then.) I must admit, my new machine makes this one seem like a real antique, but this machine still pulls very accurate. If I had the upgrade to do larger frames it would still be very servicable today!BTW, this machine is a lot easier to use than todays drop weights, no worry about keeping a bar level, it pulled to proper tension and kept it there, till you release tension. Was a great machine in its day!
     
    Last edited: Jul 3, 2008
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  11. Steve Huff

    Steve Huff Legend

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    Matell, yours looks just like mine. You've cleaned it up nicely. I took mine apart to start cleaning it up, but just haven't had time to work on it lately. Jim's is definitely the prehistoric model. But, Serrano's were made to last.

    The problem might be that Serrano's weren't made to string oversized rackets. When you step on the pedal, that moves the string gripper back. You place the string in the grippers jaws and let the weight drop. Tension is increased by moving the weights further out on the arm. It should be marked, but you might want to make sure it's calibrated correctly. Now back to the problem. When you drop the weight, the gripper may run out of room, especially when doing the crosses. All you have to do is pull tension, clamp, readjust the string, pull the same string again while releasing the clamp. It's time-consuming, but it works.

    The clamps are great. They don't move. Most Serrano's have a few hundred thousand rackets under their belt, so the clamps are often worn a little. Other than a machine shop, I don't know how you'd reapply the equivalent of "Diamond Dust coating". Hope this helps.
     
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  12. matell

    matell New User

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    thanks guys for the info. I think steve nailed it on the head, regarding the oversize racquet issue. I play with a babolat puredrive and aeropro drive, which are both 100sq in racquets, and the issue, in part, comes down to lack of room in moving the tensioning clamp, leading to a small degree of additional tension on each pull...with that being taken up by the string on the outside of the racquet. However, I seem to be able to cope by clamping the string in various ways. Perhaps I will start trying to just grab it straight on, without the wrapping, and just tightening the clamp down more firmly. By the way, the pics I linked to aren't of my stringer, just identical in style. Mine isn't quite as clean :oops:

    Anyway, thanks for the help.
    matt
     
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  13. Steve Huff

    Steve Huff Legend

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    Matt, I'm considering trying to make mine into a modern stringer, but keeping the dropweight system. You're welcome to try it too if you want. One option is mounting an electric motor above the weight arm so that the motor would lift the weights instead of having to use your foot to lift it. Then, it would let it down slowly, but still rely on the weights for tension. The other option is to disassemble the weight arm, bolt up the crank arm and mount a Wise tension head. That would take care of the pull length issue.
     
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  14. matell

    matell New User

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    Hi steve - I think I am going to pass on joining you in the upgrade project for now. I don't have the funds for the wise tensioner (I only string my own racquets), and I don't have any trouble pressing the pedal. Although there were some tough spots when doing the stringing, I think I may have figured out some fixes...For example, pulling the 1st couple strings on the mains are very difficult with my racquet because the tension clamp doesn't fit under the frame, but I hoping that I can overcome this by clamping the mounts down at a different position, so that I pull at a bit of an angle, rather than straight on. Hopefully, this will work for other points on the frame as well.


    Good luck with the update. Let us know how it goes.
    best
    matt
     
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