Has Anyone Ever Used ?

[cwrepair]

I was just wondering if anyone uses because I hear it does a faster and better repair because it evacuates the air before droping the resin. Thanks Chris CWREPAIR

[mafsu]

Several companies claim to create a vacuum eliminating all the air from the break then introducing resin to an air free break. I'm not a physicist, but if you could in fact produce such a vacuum wouldn't you then have to break said vacuum to introduce the resin? I think it's just a marketing ploy. I haven't used the system. So take my comments with a grain of salt.

[glassdoctor]

I haven't used it. If you have seen the new GT equipment, it's based on the same idea as

But the fact is, with good techniques and knowledge, the current crop of wsr tools do a fine job an some are much less complicated. I can't imagine giving up the simple but effective tools I use. (generic screw piston type system)

[repare-brise]

CW

I have not used , but the system that I use does create a vacumm before injecting. When the injetor is placed on the glass it contains only resin, the piston is then withdrawn creating a vacumm. With the suction cycle in progress the resin automaticaly repalces the air that is removed from the break(on a sealed break such as a bulls eye the only air that is drawn into the injector is the air that is in the break, with a star it may happen that one of the legs reaches the surface of the glass, when this happens you simply put a drop of crack resin and a curing tab over the offending leg, the vacumm then draws the resin into the leg) . The pressure cycle that follows is used to fill the remainder of the break if required.

To answer Mafsu

The physics behind a sealed injector are quite simple. When you withdraw the piston a vacumm is created inside the injector, meaning that it is technicaly devoid of air(if you ever come to Quebec I can demonstrate). The air from the break is then drawn through the resin that is in the bottom of the injector. When the piston is returned to the starting position the pressure inside the injector is returned to atmospheric pressure, further applying the piston creates pressure. A straw can be used to demonstrate this principle. Cover the end of a straw with your finger(haven't I read this somwhere else?) fill 1/8th of the straw with your favorite liquid, and suck on the straw, if the other end is well sealed the liquid should stay put in the straw, and all you are doing is reducing the air pressure in the straw(some straws will actually colapse under the suction you exert)just as withdrawing the piston inside a seal injector does, reduced air pressure(under that of the atmosphere)is a vacumm. A piston in an engine does the same thing, on the downward stroke it creates a vacumm sucking the air/fuel mixture into the cylinder. All this being said the amount of vacumm is not that important, you just need less than the surrounding atmosphere(roughly 14.696psi at sea level at 32 degrees F) inorder to have a vacumm in your injector. If you require more deatailed explination i will be happy to help, have fun with your straw.

Merci

[mafsu]

I do not need a demonstration. Nor a trip to Quebec to understand how a wsr injector works. I like you use one every day. You should look at a description of the product being discussed before commenting on it. As you obviously have not with this product as it doenot work like the injector you use. It stores the resin in a seperate chamber that is opened to introduce the resin after significant suction is produced.

[Gr8tTech]

have fun with your straw huh?

you sure are a smart guy what with at least 8 college degrees and able to do 60some repairs a day. boy i wish i could be like you!

whatever dude. anyone can lie on the internet.

[repare-brise]

mafsu

I have looked at their products, and liturature. They use a simple valve in the injector to allow the resin to be injected while still appling a vacumm. I know that it does not work like other injectors but as with all quaility injectors, combined with goob WSR techs the end results are excellent. The litterature that they provide has a few exagerations, but is basicaly sound(knocking pressure first products(or the competition) is not a sound selling technique)

All that I have tried to do is answer your questions, but sometimes what's in my head(french) doesn't come out as I had hoped, leading to confusion. So maybey the straw idea's wernt the greatest, but it's easier to show than explain in most cases.

Gr8, I an sorry if I have offended you in any way, this is not my intention.

Merci

[maxryde]

Good description Yvan! You gave me a good mental picture! I've watched the forum and noticed a lot of discussion on pressure and vacuum lately and would like to add,
1. Hydraulic pressure or vacuum is a solid not a gas.

2. Pneumatic pressure or vacuum is a gas not a solid.

While we generally work in a combined atmosphere, part hydraulic part pneumatic,the greater the hydraulic pressure the more the trapped air is compressed to equalize to the liquid. The air will always rise to the top as it is lighter than the resin and if it has a clear passage to the surface of the resin in the chamber it escapes and voila repair is acomplished!

As far as the is concerned, while the system may truly introduce the resin in a vacuum situation which is a plus. THERE IS NO WAY ANY SYSTEM IS TOTALLY HYDRAULIC!! It is only after all air is removed from a break that you can truly have a purely hydraulic injection and since at that point the damaged area is filled with resin there is no point in pressuring it again!!

While this post may ruffel some feathers out there I want to say that it is not my intention to do so I just had to respond after seeing all the confusion. I hope this is helpful or provokes some thought. Scott:~)

[repare-brise]

Scott

Thanks, actually this whole thread(and others before it) comes down to 2 questions, Are you doing great repairs with what you have? Are you comfortable with your methods? If the answer is yes to both, than knowing the physics behind the opperation is trivial. "If it ain't brke don't fix it" is something that I have heard here before and I think it applies.

Merci

[a1repair]

I like to probe fill. It's easier :biggrin: