Ring around the bullseye

[Delta Kits]

repare-brise,

How'd I know you would respond?

weather or not the piston or a minute amount of air is contacting the resin both can exert the same amount of pressure(many large industrial applications use an air over hydraulic system, the air is used a a shock absorber in those cases, as air will slightly compress, where as liquid compresses very little)

I'm not sure I understand, could be just the language, but at first you say air pressure & hydraulic pressure exert the same amount of pressure, but then later you say the air compresses more and liquid compresses less.

With air pressure, as you said, the air compresses more, so you need MORE pressure & MORE vacuum to accomplish the same task that you would with matter that does not compress as much. All other things being equal of course. That's all I was saying.

The amount of air that is present in the injector is very minute(remember the air that is there came from the break and I don,t think a bull's eye contains a little more than a few cc's.

Remember, at least with every air pressure system i've seen, there is air in the injector to begin with, so you have to account for that.

But the important thing is to pull a vacumm of at least 2 inches of mercury

We feel the important thing is to remove all air from the break. I'm sure you feel the same way, but again, 2 inches of mercury depends on the system you're using. Maybe some of those 28 inches of mercury guys NEED that much in order to remove air. So, as a general rule, use the least amount of pressure/vacuum as possible and still accomplish your goal. That's our opinion anyway.

sory if I offended you in anyway.

Nope, no offense taken! I just need to make sure our customer (the original poster) gets the information he needs for our system.

[repare-brise]

Jeff

And I knew you would respond as well.

Yes the original poster need the info relating to his equipment, but as you know you have the best forum in the industry, and subscribers here are not only Delta users.

I believe that you need to get a degree in fluid dynamics(I do and it helps), you seem to have a little problem grasping the physics of what"s happening in some of your competitors products. Knowing the competiton as well as you know yourself is an important part of R&D, and sales, otherwise how do you know for sure you are better . I speek for myself here when I say that when my injector hits the glass(I should say makes contact with) there is only resin inside of it, and the only air that enters the injector is the air that was in the break. I know that some companies advocate putting the injector on the glass, adding the resin to the injector, then screwing the piston into the injector. This method does introduce a lot of air and concequently can not produce any significant vacumm, since the air inside the injector is trapped and when the piston is withdrawn, all that happens is that the air is un-compressed. I have had the pleasure of working with your products, but chose another company for various little reasons(end results are the same, how they are achieved is a little different). I believe that your products are amoung the best on the market, and that any WSR tech would be well served with them. And this forum is proof of the fact that you have nothing to hide, nothing to be ashamed of, and that customer service is your top priority(no customers no business). I say "keep up the good work" But maybe a little more homework may help your cause in the future.

Once again thanks for the opportunity to voice our opinions openly.

Merci

[Delta Kits]

I believe that you need to get a degree in fluid dynamics(I do and it helps)

LOL! Now that's funny!

You're right though. With some of these systems out there, they act like you need a master's degree just to do a decent repair!

Our system is much simpler than that. No reason to overcomplicate matters.

I'm quite able to grasp the physics behind what happens during repairs, but thanks for your concern. Let's just say that, in reality, i've never seen someone able to do the bottom load, vacuum first flip without introducing some air into the injector. If you can, great.

Also, in case i'm not clear, i'm not specifically speaking of GM equipment. I'm talking about that "type" of equipment, as there are others that do basically the same thing.

This thread has gotten off track. Magicogar, I recommend calling for tech support, but just know that some degree of a bullseye ring is normal.

[glassdoctor]

Ah... the truth comes out. Good posts...

Yvan I do exactly as you and I know how well it works.

I'll make a new thread for a follow up question for Deltakits....

[screenman]

Jeff

I did not mean that the air was the pressure ring just that trying to fill the break when it was full of air could or would cause a pressure ring, please read the post again.

Thanks.

[Jeremiahswindshieldrepair]

Boy .... and to think .. this whole time I was just doing quality repairs and not worrying about all this stuff. If only I had known it needed to be this complicated when I first started I could have studied a little more

[Layne]

Well---dogies!

Now fellas, that can all be a bit confusing.....

Why don't we "de-technify" and get down to layman's language? This is beginning to look a bit like a debate at the UN...

[repare-brise]

Layne

Good point, here goes my best shot.

You need to suck the air out in order to be able to put the resin where you want it. If there is air in the break it may stop the resin from going where you want it to. For a quick demo of air displacing liquid, go back to your younger days and hold your finger over the end of a straw and insert the other end into a glass of water. The air that is in the straw will not allow the water to go into it.

Jeremiah

Technogeeks and full time students such as my self(I have diploma's in hydraulics, pneumatics, auto mechanics, cabinet making, plumbing, electronics, welding, machining, and a few others, I never quit school, I just kept on taking night courses after I started working full time) work hard to make complicated things seem as simple as possible(GT apperently doesn't have any of us on staff, hence the eliminator :eusa_clap ). Unfortunatly when you wind us up we are hard to stop. The whole point of this thread has been the same as most threads here, how can we all benefit from each-others experiance to be better WSR techs. An old engeneering proverb applies here K.I.S.S., keep it simple stupid, the more the r&d people sweat the details, the less the customer has too.

Mercii

[sunshine wr]

Use the basics taught by your equipent manufactorer and turn them into your own technique. K.I.S. Not compilicated.

[magicogar]

If the rings on the bullseyes are normal, that's all I needed to know. I've perfected all the tips and techniques on all kinds of repairs and those came out very good. But the rings on the bullseyes are what's bothering me in the past. My main concern I think that's causing this is pressure curing and/or applying too much pressure. Breaks that are old and contamination may also be a factor.

Any tips on minimizing the bullseye rings would be great!!