I am curious to know 2 things about the RDC as it relates to string bed deflection. First, is there a calibration procedure for this function? And second, is there a lubrication schedule for the mechanism?
Aloha Ed, These are good questions, but unfortunately, I can't answer them. Nothing in the user's manual or technical guide mentions either one of these. I have one of the original models of the RDC and have been fortunate to keep it running for almost 30 years now without any issues. 🤙
@@alanvanzee Yes, since you have access to Arnulf's ERT300, you can see how string tension really drops. My ERT700 wasn't always able to measure the tension of your string setup for some reason, but I'm guessing that it was probably at 30/31 DT right off the stringing machine. I'll be able to check now since I have the 300 and will let you know. 👍
ERT300 works very accurately compared to the set tensile strength of the stringing device. Especially with syn gut and multis. There is sometimes a small difference with polys, especially with thicker polys (1.30mm) Most requested stringjobs for 100in² DT 30-33 Poly 20-22kg DT 33-37 Syn-Gut 22-24kg DT 35-38 Multi 23-25kg Grtz, Eric, Belgium
I question how to interpret DT and RA values as they focus heavily on the properties of the center strings, NOT the entire stringbed. I say this because when I string traditional, say 54 lb mains, 54lb crosses, I get a very similar RA or DT as when I string proportionally with shorter strings being strung at tensions lower than longer center strings. In fact the outermost strings are installed in upper 20’s. The stringbed is clearly not the same. By checking tension on individual strings with a Stringmeter, it’s easy to see there is a dramatic difference, however DT and RA simply does not reflect this difference. So what are these devices actually measuring??? I suspect the measurement skews heavily toward the tension of center mains and crosses vs the entire stringbed.
Aloha John, You bring up an interesting point. However, I'm surprised that when you strung using the proportional stringing method you got similar readings. I would have guessed the readings would be lower than a traditionally strung racquet. As for the tension measured on individual strings with a Stringmeter versus the center of the string bed measured with an ERT300 and RDC, here's an interesting experiment I did with all three devices. I strung two racquets with the same synthetic gut both at 52 pounds. One racquet was a 110 (16x19) and the other was 100 (16x18). RDC reading - 58 units ERT300 reading - 56 pounds STRINGMETER readings - During the stringing process, I took the readings on the two center mains, located at the center of the string bed at the following intervals. Notice the tension listed on the left main (LM) and right main (RM). 43LM/43RM after installing 4 mains 41LM/41RM after installing 8 mains 38LM/38RM after installing 12 mains 37LM/37RM after all mains were installed 39LM/39RM after installing 4 crosses 43LM/43RM after installing 8 crosses 47LM/47RM after installing 12 crosses 51LM/51RM after installing 16 crosses 51LM/51RM after all crosses were installed In the end, the Stringmeter came out with a final reading of 51. In my opinion, this final reading was due to three factors. 1. The natural frame distortion that occurs during the stringing process. 2. The main strings are stretched after the installation (weave) of each cross string as a result of being pushed up and down. 3. The tension reading of the center main strings is tighter due to the surrounding strings that keep them in place. I hope this makes sense. 🤙
@@AMstringing All makes perfect sense. I suspect the reason the mains went down with each measurement may have had something to do with frame distortion, but also from stretching those center strings taking readings with the Stringmeter. If you were to perform same setup again, I would not be surprised if you waited to measure until after 12 mains were installed, you might find a reading closer to 43 than 38. And yes, I expected much different readings on proportional vs traditional too.
![Racquet Stringing [Optimum Tensioning of Cross Strings]](http://i.ytimg.com/vi/FFlCqzQPY1E/mqdefault.jpg)
![Racquet Stringing [String Tension Devices | Tracking & Comparisons - Part 1 of 2]](/img/n.gif)
I am curious to know 2 things about the RDC as it relates to string bed deflection. First, is there a calibration procedure for this function? And second, is there a lubrication schedule for the mechanism?
Aloha Ed,
These are good questions, but unfortunately, I can't answer them. Nothing in the user's manual or technical guide mentions either one of these. I have one of the original models of the RDC and have been fortunate to keep it running for almost 30 years now without any issues. 🤙
@@AMstringing Thanks for taking the time to check and for responding so quickly.
Thanks for the comparison
Aloha Javi, Thanks for watching!
You have my setup! My DT is 28.
Aloha Alan, Cool! Funny, according to the ERT300, at the 28DT reading, it's almost "time to restring!" 🤣
@@AMstringing When I first get my rackets from you Arnulf's ERT300 reads 28. I send them to you when they reach 23, which is almost now.
@@alanvanzee Yes, since you have access to Arnulf's ERT300, you can see how string tension really drops. My ERT700 wasn't always able to measure the tension of your string setup for some reason, but I'm guessing that it was probably at 30/31 DT right off the stringing machine. I'll be able to check now since I have the 300 and will let you know. 👍
Really cool!
Head Graphene Touch Prestige Mid
MSV Focus Hex Plus 38 1.15mm String:
Reference Tension: Mains 53 lbs, Crosses 56 lbs
DT 38
Aloha Darryl, Thanks for contributing your string setup. I'll include this on my list! 👍
ERT300 works very accurately compared to the set tensile strength of the stringing device. Especially with syn gut and multis. There is sometimes a small difference with polys, especially with thicker polys (1.30mm)
Most requested stringjobs for 100in²
DT 30-33 Poly 20-22kg
DT 33-37 Syn-Gut 22-24kg
DT 35-38 Multi 23-25kg
Grtz, Eric, Belgium
Aloha Eric, Thanks for contributing your string setups! This is great information! 👍
Tecnifibre T-Fight / Signum Pro Polaris 1.20mm : tension machine 21kg
ERT300 dt = 31 fresh
ERT300 dt = 30 1day/no play
ERT300 dt = 29 2day/no play
Prince O3 Legacy 105
Tecnifibre TGV 15L/1.35mm
Reference Tension : M & C 24kg
ERT 300 : DT 37
After 24h : no play : DT 34
I question how to interpret DT and RA values as they focus heavily on the properties of the center strings, NOT the entire stringbed. I say this because when I string traditional, say 54 lb mains, 54lb crosses, I get a very similar RA or DT as when I string proportionally with shorter strings being strung at tensions lower than longer center strings. In fact the outermost strings are installed in upper 20’s. The stringbed is clearly not the same. By checking tension on individual strings with a Stringmeter, it’s easy to see there is a dramatic difference, however DT and RA simply does not reflect this difference. So what are these devices actually measuring??? I suspect the measurement skews heavily toward the tension of center mains and crosses vs the entire stringbed.
Aloha John,
You bring up an interesting point.
However, I'm surprised that when you strung using the proportional stringing method you got similar readings. I would have guessed the readings would be lower than a traditionally strung racquet.
As for the tension measured on individual strings with a Stringmeter versus the center of the string bed measured with an ERT300 and RDC, here's an interesting experiment I did with all three devices.
I strung two racquets with the same synthetic gut both at 52 pounds. One racquet was a 110 (16x19) and the other was 100 (16x18).
RDC reading - 58 units
ERT300 reading - 56 pounds
STRINGMETER readings - During the stringing process, I took the readings on the two center mains, located at the center of the string bed at the following intervals. Notice the tension listed on the left main (LM) and right main (RM).
43LM/43RM after installing 4 mains
41LM/41RM after installing 8 mains
38LM/38RM after installing 12 mains
37LM/37RM after all mains were installed
39LM/39RM after installing 4 crosses
43LM/43RM after installing 8 crosses
47LM/47RM after installing 12 crosses
51LM/51RM after installing 16 crosses
51LM/51RM after all crosses were installed
In the end, the Stringmeter came out with a final reading of 51. In my opinion, this final reading was due to three factors.
1. The natural frame distortion that occurs during the stringing process.
2. The main strings are stretched after the installation (weave) of each cross string as a result of being pushed up and down.
3. The tension reading of the center main strings is tighter due to the surrounding strings that keep them in place.
I hope this makes sense. 🤙
@@AMstringing All makes perfect sense. I suspect the reason the mains went down with each measurement may have had something to do with frame distortion, but also from stretching those center strings taking readings with the Stringmeter. If you were to perform same setup again, I would not be surprised if you waited to measure until after 12 mains were installed, you might find a reading closer to 43 than 38.
And yes, I expected much different readings on proportional vs traditional too.
@@johnyoungblood I'll try that experiment the next time I have the opportunity to do so.