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View Full Version : lock out stringer calibration procedure


BlxTennis
04-02-2012, 09:44 PM
How do you guys check the calibration of your lock out stringer? I used to loop a string to one end of my digital fishing scale so that it forms a Y shape. I used 2 fixed clamps on the stringer to clamp down the 2 Y ends of the same string on one side of the fishing scale. On the other end, I loop a string through the hole and tension this piece of looped string and take the reading off the scale. This method seems to give much lower tension reading. For example, the setting on the lock out is set to 66lb. However, the reading from this calibration will give something like 56lbs. I later have the fishing scale hook on to a fixture on one end of the stringer and the other end, I tie a string to the other end of the fishing scale and pull that one piece string. The reading on the latter is much closer on the setting from the stringer than the 1st way I was doing. If stringer setting is on 54lbs, reading is something like 56lbs. So I am curious if my 2nd way of calibrating the machine is correct. I also found the following way of calibrating from another forum which seems reasonable thing to do as well.

"Mount a racquet on your stringing machine. On the end that has the middle of the frame (some frames its top, others are bottom) thread the string through one of the middle holes, and in turn, through the other. You should have two strings at this end now. Use your flying clamp and clamp these two strings together (do it securely). Now, tension the other end of the callibrator. it should give you a pretty accurate reading, but also bear this in mind."

Irvin, is this something you can add to your video collection by making a video? I learned so much by watching your stringing videos.

Irvin
04-03-2012, 03:26 AM
...Irvin, is this something you can add to your video collection by making a video? I learned so much by watching your stringing videos.

One of the first videos I made but the quality is a little low.

https://www.youtube.com/watch?v=cr2GeWDMs_A

I also made some other videos and I have found that if you put your string through the racket grommets the friction of the string against the grommet will lower the tension.

When you make your reading you want the tension when the lockout first engages and not after it settles so you have the true reading of where the lockout is set.

BlxTennis
04-03-2012, 06:44 AM
One of the first videos I made but the quality is a little low.

https://www.youtube.com/watch?v=cr2GeWDMs_A

I also made some other videos and I have found that if you put your string through the racket grommets the friction of the string against the grommet will lower the tension.

When you make your reading you want the tension when the lockout first engages and not after it settles so you have the true reading of where the lockout is set.

Another one excellent informative video. Thanks Irvin.

BlxTennis
04-03-2012, 10:54 AM
One of the first videos I made but the quality is a little low.

https://www.youtube.com/watch?v=cr2GeWDMs_A

I also made some other videos and I have found that if you put your string through the racket grommets the friction of the string against the grommet will lower the tension.

When you make your reading you want the tension when the lockout first engages and not after it settles so you have the true reading of where the lockout is set.

Irvin, should I worry about if the clamp will slip over the racquet retainer? If I mount the racquet then it's very unlikely it will slip but then I wouldn't be able to pull the tension like you showed.

Irvin
04-03-2012, 02:31 PM
Irvin, should I worry about if the clamp will slip over the racquet retainer? If I mount the racquet then it's very unlikely it will slip but then I wouldn't be able to pull the tension like you showed.

Not sure what you are asking when I pulled tension to calibrate the lockout I did not use a racket.

BlxTennis
04-03-2012, 04:46 PM
Not sure what you are asking when I pulled tension to calibrate the lockout I did not use a racket.

I watched the video again. I guess there is no chance that the string&the clamp will slip up the way you have it there. Thanks again for all of your sharing. Now my machine is calibrated and adjusted.