Pro stringer platinum with constant pull

[Anthon]

Hi

I have a pro stringer platinum and a tyger t-630. The pro stringer is supposed to be with a constant pull system and the tyger is a lockout pull machine. I have a expensive digital weight for calibration. And if I pulle a string with it attached on the tyger machine I see the tension is dropping fast after the first pull (first seven seconds) when the tension have dropped around 1 kilo the machine makes a new pull and when the pull is done the tension is higher and its dropping fast again. If I use the calibrator on the pro stringer platinum the same thing is happening so I´m a bit worried that this means that the pro stringer platinum doesn´t make a constant pull. I thought that it would never allow the tension to drop and make small adjustments all the time if it was a constant pull and not a lockout pull. Can anyone please explain this for my.

Thanks in advance

Anthon

 

[Irvin]

If you set tension to 55 pounds it's normal for the tension to go slightly over 55. And cutting off the tension wil drop to high 54 lbs. I see that on my display which is output of load cell.

 

[Anthon]

Ok. Thank you.
But the tension is dropping from 56 lbs to 54 lbs on both machines while the machines still is holding the string. I thought the constant pull would keep it at 55 lbs in your case all the time until it is cut off(clamped)

Sorry about my bad English

 

[esgee48]

What you see in CP is normal. Depends on sensitivity of load cell before it senses the need to pull again. So it pulls to 56; waits and tension drops to 55 as the string stretches; it will pull to 56 again; wait and the tension drops again to 55 as the string stretches; pulls again, etc. until you decide to clamp off. You can wait as long as you want before clamping or you can clamp immediately. It's up to you, but I would let the tensioner pull at least 10 seconds before clamping. 3 cents.

 

[Anthon]

What you see in CP is normal. Depends on sensitivity of load cell before it senses the need to pull again. So it pulls to 56; waits and tension drops to 55 as the string stretches; it will pull to 56 again; wait and the tension drops again to 55 as the string stretches; pulls again, etc. until you decide to clamp off. You can wait as long as you want before clamping or you can clamp immediately. It's up to you, but I would let the tensioner pull at least 10 seconds before clamping. 3 cents.

thank you for your reply. I wait 7 sec because after that it only drops maximum 20 g each second (obv. depends on the selected tension) if it re- pulls I wait 10 seconds. But Does any one know if pro stringer platinum have a constant pull feature or the observation I describe means it must be a lock out system on this version. When an other guy I know that doesn´t seem to full know what he is stringing for a player I help on a 20 year old constant pull machine the tension seems to drop slower while playing. The string is alu power 1.25. I need to travel with the stringing machine. So I cant use a normal setup with wise tension head 2086 or another constant pull machine. But if the pro stringer platinum is a lockout machine I´m considering if it could be possible to costum made a system for wise tension head 2086 using the racket mounting from the pro stringer platinum.

 

[esgee48]

What you describe is normal. It depends on the sensitivity of the load cell or circuit board before eCP will repull. If you were using a Babolat/Baiardo/Yonex/Alpha or other expensive eCP, the tensioner would be adjusting every 2-3 seconds. You can hear it. To me, that sensitivity is likely less than 1# before it senses a loss in tension and repulls. If the components in the load cell etc are ±15% vs ±5%, then one machine would definitely be more sensitive than the other.

 

[loosegroove]

Strangely I think this may have inadvertently been the most promising review I've read about the Pro Stringer.

 

[Anthon]

What you describe is normal. It depends on the sensitivity of the load cell or circuit board before eCP will repull. If you were using a Babolat/Baiardo/Yonex/Alpha or other expensive eCP, the tensioner would be adjusting every 2-3 seconds. You can hear it. To me, that sensitivity is likely less than 1# before it senses a loss in tension and repulls. If the components in the load cell etc are ±15% vs ±5%, then one machine would definitely be more sensitive than the other.

If the machine needs to register a 5% decline in tension before it re-pulls I would call it a lock out system. If you string it at 25 kg it would only re-pull when tension drops to 23.75 kg. 10 % would be down to 22.5 kg . To me this mans you could in theory end up with a deviation of 1 kg on each string with a 5% sensitivity even if each string is clamped with a deviation of only .1 or .2 seconds. I thought CP would mean that it adjusted the pull all the time and no more than like 100 or 200 grams. So that means that the difference between lock out and CP is only the sensitivity before a re-pull. But given how fast the tension is dropping in a poly-string like alu power new pulls when tension is dropped 50 or 100 grams would mean that the string is stretched way more and become way thinner. So if you could clamp off within 0.2 seconds there would be no difference between using a lock out or a CP machine. But this wouldn´t be working for stringing because it would be a bad or inconsistent string job if the string isn´t allowed to adapt to the pull (the tension is different at each part on the string (part between clamp and frame on last pull, part on the outside of the frame the part between frame and where the machine holds the string and the part between each end on the frame (depending on distance between mains when stringing cross and dependent on the string pattern in general)). But if you allowed a 2nd pull each time and clamp of instantly the string would have adapted to the first pull and suddenly the difference between lock out and CP is that the string have more time to set in on a lock out machine (maybe better) and it would have been allowed to drop a bit more in tension before a re-pull (maybe worse even tough some one recommend that you pull drop the pull and make a new pull) and CP would also be better because less tension drop means that the string needs less time to adapt to the last pull.
So if you pull at 25 kg and the 2nd pull makes the string go to lets say 26 kg, 27kg or 27.5 kg the amount the second pull is above 25 kg is decided by how fast the machine pulls the string (not time or the % of drop in tension before it re-pulls but the time between the pull starts and is done) So maybe some machines(with a fast pull speed) would be more accurate if they were set in a manner where each new pull to keep the tension was made at a lower tension eg 24.3 kg for a 25 kg first pull. but the difference needed is most likely way different in the 20kg, 25kg and 30 kg region. The machine Wold be more advanced an expensive and costumers would get more value for the money if the machine is just more sensitive to tension drop before a re-pull and there is only ekstra benefits if you clamp of instantly which is not practical and worse because the string have to adapt to the pull to even out the tension on each part of it.

 

[Tennis_dude101]

Anthon,
To answer you question I lifted this from Diez tennis web site who was/is a Pro Stringer reseller in the USA, it describes pretty accurately how the PSP works:

"Pro Stringer Platinum is an analogue machine which establishes tension using a precision engineered spring loaded torsion bar. The desired tension is set on an analogue scale using a rotary dial. A set of limit switches and an electronic relay are used to manage the process. The control mechanism supports constant pull tensioning. Pro Stringer Platinum is elegantly simple in design and has proven itself time and again to racket players around the world since 2011."

I've had a look inside mine before and what it has is a spring loaded balance beam, when the tension drops enough the balance beam moves and activate a limit switch which retensions the string.
To me this is a crude form of constant pull that is not as accurate a a load cell or the current sensing system that the Pro Stringer Digital uses. The constant pull system on my PS does activate on mine if the tension drop is large enough to move the balance beam, I see this more on multifibre string that with poly which is a lot stiffer.

Have a look at this video and you can see the constant pull at work on the Pro String Digital:

TD

 

[Anthon]

Hi TD thank you for taking your time to describe this for me!! On this site https://pro-stringer.com/ there is only a PSP with manual a tension adjustment system. Do you know where to buy the digital version or if they stopped selling it or something. This balance beam "CP" system seems to behave very similar to my Tyger lock out machine. The only difference to me is how long time it takes to make the actual pull whish seem to be almost 1 sec on PSP compared to around 0.3 sec on my Tyger. But guess this should mean that the PSP at least cause less damage to the elasticity in polys so tension can be maintain a bit longer.

Anthon

 

[Anthon]

Maybe there is more that I misunderstod and my tyget t-630 is also a constant pull machine. I thought that a lock out system made a pull lock out and make a new pull if/when the tension is dropped a specific amount. And that CP did constant pulls to maintain tension. But it seems like a lock out machine will only make one pull no matter how much the tension have dropped

 

[Tennis_dude101]

Hi TD thank you for taking your time to describe this for me!! On this site https://pro-stringer.com/ there is only a PSP with manual a tension adjustment system. Do you know where to buy the digital version or if they stopped selling it or something.
Anthon

My understanding is that they are currently working on a new improved version of the PS Digital, I've got no idea when it will be released.
TD

 

[Anthon]

My understanding is that they are currently working on a new improved version of the PS Digital, I've got no idea when it will be released.
TD

Thank you. The good thing with the digital version besides the better system to register a drop in tension is that the digital tension setting should be more accurate than the manual one. But I hope the new one will allow smaller adjustments than one pound. Hopefully half a pound or less. But it is tine consuming to do it on the manual one if you want to be very accurate. I think it should be possible to make it more easy and fast to set tension on the manual one. And maybe I and other users can customize it to make the adjustments faster, more easy to do and more accurate.

 

[onehandbh]

If it is the same stringer as this one, someone on TW bought one and did a review.

Not so great...
https://tt.tennis-warehouse.com/index.php?threads/should-i-buy-a-pro-stringer-machine.527204/