Racquet blocked in stringing machine!

Gkv

New User
Hello, last week I bought a Pro´s Pro Tomcat MT-400 and when I pull mains, racquet get blocked in the machine. Wheel for open the machine arms get totally blocked and is impossible turning and open it.
Somebody knows why this problem happens?
 
Why do you want to open the arms when you're tensioning on the racket? :unsure:

Sorry, my english is not so good.

I don´t want to open the arms when I am tensioning. What I am saying is that after tensioning mains, arms get blocked and is impossible geting out the racquet of the machine.
 
Ensure to properly lock those longitudal mounting pulls to prevent excessive crossectional frame distortion.
 
Yes, when I regret home.
At the time I put the racquet in the machine, all is ok and machine arms open properly. When I apply tension stringing mains, arms do not open.
That’s normal tension distorts the frame.
 
Ensure to properly lock those longitudal mounting pulls to prevent excessive crossectional frame distortion.

Thank you, but I am doing it well... I am 7 years stringing everyday. I think that the machine is not ok.
 
But then I cannot get off the racquet out the machine
Don’t even try until you have finished stringing the racket. If you can‘t get the racket out after string chances you you mounted the racket with the supports too tight. Try to loosen the 6 o’clock support first the the lower side supports pushing the racket toward the 12 o’clock support. The loosed the 12 and upper side supports.

Also try using the Stringway on line tension advisor for tension reccomendations. I have found that makes removing a frame easier when you have finished.

Another option is you don’t use a hybrid is to string your racket with an ATW pattern if the mains end at the throat. String the short side and tie off the next to last main. Use the long side to string all but the last main and all the crosses from the 2nd to next to last cross. This means you end up with all the outside strings unstrung. String the outer main, top cross, other outer main, and bottom cross then tie off.
 
Sorry, my english is not so good.

I don´t want to open the arms when I am tensioning. What I am saying is that after tensioning mains, arms get blocked and is impossible geting out the racquet of the machine.
So you wanted to open the side arms only after you have tensioned the mains, and not the crosses?
 
So you wanted to open the side arms only after you have tensioned the mains, and not the crosses?

No. Arms block the racquet when I string the mains, and if I want to take off the racquet, it is impossible. For this, when I string all the racquet (having tensioned mains before crosses obviously), I could not get off the racquet. I apreciated that when I apply tension on mains, arms thight the racquet more and more.
 
Don’t even try until you have finished stringing the racket. If you can‘t get the racket out after string chances you you mounted the racket with the supports too tight. Try to loosen the 6 o’clock support first the the lower side supports pushing the racket toward the 12 o’clock support. The loosed the 12 and upper side supports.

Also try using the Stringway on line tension advisor for tension reccomendations. I have found that makes removing a frame easier when you have finished.

Another option is you don’t use a hybrid is to string your racket with an ATW pattern if the mains end at the throat. String the short side and tie off the next to last main. Use the long side to string all but the last main and all the crosses from the 2nd to next to last cross. This means you end up with all the outside strings unstrung. String the outer main, top cross, other outer main, and bottom cross then tie off.

I tried, but when I apply tension to mains, arms become thighter and thighter to the frame and is impossible to take off.
 
I tried, but when I apply tension to mains, arms become thighter and thighter to the frame and is impossible to take off.
That’s how it works normally. As you string the mains the racket gets shorter and the width expands with every main. As you string the crosses the racket should return to its normal size. Never try to loosen the supports until the racket is completed.
 
@Gkv Why are you taking the racquet off the machine when only the mains are installed?

You should not do that.

Install the crosses after the mains and finish the racquet before removing it.

I don´t do it. I am saying that when I string mains, racquet get blocked. It is blocked totally at the end of the stringing job because for stringing all the racquet, obviously I have stringed mains before crosses. Arms get thighter and thighter when I string mains, when I string crosses don´t, but however racquet is blocked at the end of stringing job.
 
@Gkv Why are you taking the racquet off the machine when only the mains are installed?

You should not do that.

Install the crosses after the mains and finish the racquet before removing it.

Sorry for my english.
What I mean is that when I string the racket and pull the mains, the arms start to get tighter and tighter to the frame. When I do the crosses it doesn't happen, but since I've done mains before, the racquet has already stayed in the machine without being able to get out of it
 
I gather that the self-centering side support arms are not eventually loosening/opening up wide enough to remove the racquet after completely stringing mains and crosses? Never heard of such…this is a physical, threaded by hand (CW/CCW) mechanical action.
 
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Try moving the 6 and 12 o'clock supports towards the head of racquet a couple mm. Then possibly the side arms near the throat may be loose enough to then open up and then be able to remove the racquet.
 
Hi GKV, i'm sure we've all had the same problem where you tighten the arms and 6/12 clamps evenly but by the time you're done, you can untighten one of the clamps but maybe not the other due to racquet warping after stringing. Obviously you want it to be even pressure on the racquest so you wont have this issue. when i've had this issue and can't turn the knob to loosen the clamps, i will use one of those rubber strap wrenches on the knob and unloosen it that way. tough to say if thats what you're running into as, like you said, your english is a bit tough to understand, but i hope this helps.
 
As a Tomcat owner, I understand what you're referring to. Ways I've solved for this:
  1. Don't tighten the arms and the main supports too much; make sure they're tightened evently (e.g., make sure the arms are not tightened super tight while the main supports - at 6 and 12 o'clock position - are loose... and vice versa).
  2. When taking the racket off, I release the arms and main supports little by little (i.e., turn each knob a little bit while alternating from knob to knob). If one of them won't release, I sometimes actually tighten the other ones (e.g., if I'm unable to release the main supports, I will tighten the arms a bit, which will stretch the racket ever so slightly, thus putting less pressure on the main supports so they can be released more easily).
Haven't had this issue in months now after deploying the above, and #1 is typically enough to prevent this all together, but if it does happen, #2 is an easy way to get out of that situation.
 
I had the same problem a few times in the beginning until I figured out how much to tighten all the support points evenly and it hasn’t happened again. You don’t want to over tighten them or they will get stuck and the side supports can’t be loosened after stringing. Was always the side arm supports that can’t be loosened.

To loosen it you’ll need a large plier but u risk damaging the finish on the Knobs.

What I did was to stick one of the hex keys into the screw hole on the knob. Use the hex hey that’s large enough to just fit into the hole from the long end of hex key. Then it will give u enough leverage to loosen the knob.
 
The fixes cited are good. But if your frame squashes, there something wrong with the way you tension the crosses. Doing full bed with same string and tension, I never get squashing. Only with large tension differentials does it happen. If you do differentials, expect it to happen.
 
I think that the machine has a problem in the arms and this thight more and more when I pull
Is this your own racket? You string the MAINS first. Then you string the CROSSES. (Just making sure you have the right terminology). Try stringing the crosses 5 pounds tighter than the mains. See if that helps. I have found this to be pretty common on older Head Radicals, maybe a few other rackets too.
 
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