Tension calibrators and Tension Testers?

A

aznfatmonkey

Rookie
I just ordered an Eagnas combo 910 :) . I was just wondering. Do I need a tension calibrator to calibrate my machine? Also, can I use a calibrator to see if I strung my racquet right, or use a tension tester to calibrate my machine? What is the difference between the two? Why is the Eagnas calibrator so much cheaper than any other calibrators?
 
I used to use the Eagnas Spring Calibrator and it's pretty close. For the money you are better off ordering an Elctronic Pull Scale from fleabay. I got mine for like $8 including shipping. The seller was eforcity. It's actually the same scale Maxline sells, but without the Eagnas logo.

As for the Tension Tester, Il Mostro said it was a good product, before he got banned. I've been meaning to buy one, but I've been busy with other things, lately.
 
Can you clarify what you mean by the electronic pull scale, and where to get it? I'm kind of confused. Also, is a tension tester necessary to see if I strung my racquet right?
 
Just get a fish/luggage digital scale. A Proscale Versa77 will run less than $30 and is a reputable brand.
I've had a couple of the cylindrical spring calibrators an prefer the digital-
 
Here is what I have:
2i0gh28.jpg

^^^$8
264nokn.jpg

^^^$15
 
haha i am wondering so too :P since the digital calibrators that specific tennis companies provide are very expensive.
 
I have a question about calibrating my machine. I got the portable electronic scale for my Combo 910. I set my machine to 60 lbs, and when I pull tension, the calibrator goes up to about 60-61 lbs, but right when the tension head locks up, the tension immediately goes down to about 57. I tried it multiple times, and the same thing happens. Is this normal? Also, I haven't been stringing my racquets 5-10% higher to compensate for the lock-out. What's the risk of stringing above the recommended tension for the racquet?
 
I just got my 940 and I needed to string a racquet quickly for a lesson, so I trusted that it was calibrated from the factory like its suppose to....
It wasnt even close

I have the same digital scale from Eforcecity that Lakerfan pictured. When I checked tension it was 11lbs too low!!!!:confused::shock::mad:

So I went through the process of recalibrating it.

One question I do have, is similar to above--when I pull tension with the scale. when it locks out it reads whatever tension, but then quickly drops, then stabilizes briefly and then starts to decrease very slowly.
I am assuming this is the string continuing to stretch some even tho Ive pulled it at least a dozen times.

So which is the correct tension? The initial reading before it starts dropping? or the tension when it stabilizes?
 
I've notice that too, it's the string stretching, even with kevlar. The correct tension is the number about 5 sec after lock out.
 
for spring tensioners we use maximum tension you see @ GAMMA and the factory. our calibrators actually have a max (peak) hold button. because each type of string is going to relax differently. an most likely your not going to have the same string in your calibrator as your rqt.
bret
 
As I mentioned, the the tension reading drops after lockout, but it drops consistently to the same tension, and stays there. It doesn't drop after that. I'm confused because there are two different answers:(. If I calibrate it to the reading after the tension stabilizes, will I still have to string 5-10% higher because it's a crank?
 
aznfatmonkey said:
As I mentioned, the the tension reading drops after lockout, but it drops consistently to the same tension, and stays there. It doesn't drop after that. I'm confused because there are two different answers:(. If I calibrate it to the reading after the tension stabilizes, will I still have to string 5-10% higher because it's a crank?
Click to expand...

Most string will continue to stretch, even on a CP machine it will move around. You must ask yourself, how long does it normally take you to move the clamp to the new position after the tensionhead locks out?
 
"Use the 1 tool for the right reasons, to get the right readings, us the right tool"

Mr. Aznfatmonkey: We are talking about 2 diffrent tools for 2 different readings here. # 1 is the reference machine tension reading, I use a digital scale called the Ultra sport 30 or 50, very accurate, why the 30 & 50. well the 30 goes up to 66Lbs and the 50 up to 100 lbs. I normal set my machine ref reading to lockout at 50lbs, on a lockout, and I use the Ultra sport 30. The first reading after it locksout it the proper reading, not 5 secs or so after. Different types of string will stretch and relax more than others, a good type of string is kelvar, it gives some but not that much. What you want to do just before you lockout goes easy and smooth, to minimize the final reading jumping around. Same goes for an electrical CP gripper head, since it is CP, it will keep adjusting while the string relaxes to maintain the set ref. tension.

To see if your are consistent with your stringing, you check your SBS, right after you finish stringing, e,g. ERT 300 which is the best and I got it at GSS online store, you have a cheaper model from Gamma the STT.

So you have ref. string machine preset tension and SBS DT tension reading, the DT reading will always be lower than the ref. tension, Don't get alarmed, thats normal, and another subject thread to create sometime later. The alarm comes when you do 2 or 3 racquets and the DT readings are different.

Thanks, best wishes NG(Panana City, Panama)
 
This is what i recently encountered with my Eagnas Flex 940. If I set the tension head puller really close to the Scale it will read one reading. If I move it out some, it reads higher.

So normally I set everything up as if I were pulling a main string. Check tension, we'll say that when its close to the racquet mount it reads 60lbs.
if I move it out a few inches, it will read 68lbs.
If I rotate it like pulling a cross, it will read about 68lbs.

I calld Eagnas and it wasnt very helpful. He said he only pulls from within a few inches to calibrate.

so my question is the consistency of the tensioner since Its giving different tensions depending on the range it has to crank.

Any Input?
 
Nicholas Guarnieri said:
Mr. Aznfatmonkey: We are talking about 2 diffrent tools for 2 different readings here. # 1 is the reference machine tension reading, I use a digital scale called the Ultra sport 30 or 50, very accurate, why the 30 & 50. well the 30 goes up to 66Lbs and the 50 up to 100 lbs. I normal set my machine ref reading to lockout at 50lbs, on a lockout, and I use the Ultra sport 30. The first reading after it locksout it the proper reading, not 5 secs or so after. Different types of string will stretch and relax more than others, a good type of string is kelvar, it gives some but not that much. What you want to do just before you lockout goes easy and smooth, to minimize the final reading jumping around. Same goes for an electrical CP gripper head, since it is CP, it will keep adjusting while the string relaxes to maintain the set ref. tension.

To see if your are consistent with your stringing, you check your SBS, right after you finish stringing, e,g. ERT 300 which is the best and I got it at GSS online store, you have a cheaper model from Gamma the STT.

So you have ref. string machine preset tension and SBS DT tension reading, the DT reading will always be lower than the ref. tension, Don't get alarmed, thats normal, and another subject thread to create sometime later. The alarm comes when you do 2 or 3 racquets and the DT readings are different.

Thanks, best wishes NG(Panana City, Panama)
Click to expand...

Thanks for the info. I figured that I didn't really need a tension tester, since my racquet feels fine after stringing.
 
When you use a crank machine, after the tension lock-out, the string starts to stretch, that's why you see the tension on the scale is dropping, depend on what type of string you use on the scale, and that's why most people suggest kevlar string since it stretches the minimum.

Thus, when you are actually stringing a racquet, after the tension lock-out, you want to clamp the string as soon as you can to prevent the stretch => tension loss on string.

When you calibrate the tension head, the most ideal setup is the shortest distance between the clamp--scale--tension head, it states in the manual.
The shortest distance means you use the shortest length of string, thus the least tension loss during calibration.

cheers
 
10ispro said:
This is what i recently encountered with my Eagnas Flex 940. If I set the tension head puller really close to the Scale it will read one reading. If I move it out some, it reads higher.

...

so my question is the consistency of the tensioner since Its giving different tensions depending on the range it has to crank.

Any Input?
Click to expand...

Likely this has more to do with the increased angle of the pull rather than the crank range.

Large pulling angles will give you less tension due to grommet friction.
 
Last edited:
aznfatmonkey said:
Why does it matter how long it takes for me to move the clamp? Won't the string continue to stretch anyway after I clamp it?
Click to expand...

When you actually string a racket, you want to be consistent with the amount of time you clamp every string. This allows best effort at maintaining consistent stretch for the strings after it is clamped.

When calibrating lockout, lockout should occur at highest reading. You can wait 5 sec and calibrate to the lower number, and as long as you are consistent, it's fine. Keep in mind calibration is just a reference number. Racket strung at 50Lb on your machine might not be the same as racket strung on my machine at 50Lb.

Up 5 to 10% is recommended only due to reference to past string jobs - if you or your customer had their rackets strun on constant pull machine, then you may want to up it. Again, it is just a reference number, so it will take a few string jobs on the same racket for the player to find their preferred tension (when moving to different stringer/machine).
 
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