Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Rework Equipment

Curt Maddox

#1745

Rework Equipment | 28 February, 2000

I'm currently researching new rework equipment, and was wondering if anyone had any recommendations. We currently have an older PACE hot air system that has had mixed results. It tends to overheat the board and IC. Is the IR any better, or has hot air improved that much? I've spent a great deal of time investigating the newer systems, but see pitfalls with all of them.

Thanks

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Russ

#1746

Re: Rework Equipment | 28 February, 2000

Engineer, I have had great success with the Air-Vac DRS24 equipment.

Russ

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Tony

#1747

Re: Rework Equipment | 28 February, 2000

I work for a contract manufacture of PCB's, we are also in the BGA rework business. We see all kinds of different size boards, as well as different types of BGA's and micro BGA's. We selected the Conceptronics Freedom 2000 over the Air Vac and SRT. The selection was based on the Pre-heating as well as how easy friendly the software is and it's capabilities. I have developed new methods in removing bridging without having to remove the BGA completely. I can accomplish this only because the software is so easy. Trained operator can easily follow simple instructions that pop in the screen. We have been using the conceptronics for almost three now and have not had any problems with it...

By the way I have used SRT and Air Vac in the past..

Good luck

Tony A

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Curt Maddox

#1748

Re: Rework Equipment | 29 February, 2000

Have you ever used the IR system, or do you think that hot air is better?

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Kevin Hogan

#1749

Re: Rework Equipment | 29 February, 2000

I have used both the QX2 and BGA3500 hot air rework system from Metcal; both are great systems; the QX2 is a very simple system for leaded devices, easily trained and very inexpensive compared to SRT, Air Vac, and Conceptronics.

The BGA3500 works on leaded devices, BGA's, flip chips, uBGA's and is extremely easy to use; very operator friendly and extremely versatile.

I have also used the IR500 from ERSA - an IR rework system; too simple and very unproven; not very robust. However, the way they use IR is very promising, unfortunately, IR has gotten such a bad reputation that most people are uneasy or unwilling to see the technology

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Curt Maddox

#1750

Re: Rework Equipment | 6 March, 2000

What's the bad rap on IR? I know that ERSA has a dark IR that they say heats evenly. I worry about the entire location being heated though.

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Casey Scheu

#1751

Re: Rework Equipment | 6 March, 2000

APECORP.com Best equipment on the market. Ask anyone who has one.

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RDR

#1752

Re: Rework Equipment | 6 March, 2000

I have one (apecorp chipmaster) that I would be more than happy to sell you!

Russ

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Casey Scheu

#1753

Rework | 7 March, 2000

Russ, I'd be happy to buy your Chipmaster back. The fact that you don't like the unit tells me you don't do rework. If you were unsatisfied, why didn't you call? (305-451-4722) APE offers a 100% satisfaction guarantee. We would have given you a full credit. Who else does that? If you're going to take a jab, it should be well founded. I'll put my equipment up against any other equipment on the market anytime! If you'd like Russ, I can send in someone to train you on your Chipmaster, its obvious you don't know how to use it.

Casey Scheu www.apecorp.com

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Doug Kennedy

#1754

Re: Rework Equipment | 7 March, 2000

Russ,

I don't understand this thread in general...Got three APE Chipmaster's and one Chipper running 24/7 and have never had a problem....it's been almost three years.

What are you doing with your Chipmaster? What chips? It's rare that we have to increase temp higher than 440f...I like the low temperature solution. Also like the low velocity air...I really don't understand what kind of problems you could be having.

I'm honestly curious?

Doug Kennedy

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Erick Russell

#1755

Re: Rework | 9 March, 2000

Hi Casey,

I accept your BOLD Rework challenge. Considering you did not say what the TEST was. Let's base it on speed, thermal uniformity, and process repeatability. I have sample boards that I will take to APEX with Back to Back BGAs. Does anyone want to Join US? We rework using a YAG Laser.(Beleive it!)

Shall we meet at Sundown? At least take an offer to see a demonstration of the system.

Erick Russell www.Vitechnology.com

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Casey Scheu

#1756

Re: Rework | 10 March, 2000

Erick,

I would love to see a demo; the offer is also extended to you. I checked out your web site, are you talking about the unit located at " http://www.vitechnology.com/products/ls100_1.htm"? I must say your systems looks very impressive, and expensive. I bet you could buy several of my systems for the cost of one of your options. (Just joking.) Again, I would love to see a demo and meet with you next week at the show. I will admit my previous statements were a bit bold and I apologize if I offended anyone in any way.

Casey Scheu www.apecorp.com

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RDR

#1757

Re: Rework | 10 March, 2000

Casey, I will start with the lack of thermo-couple control - The unit I have is based on time and temp. exclusively. What happens when a cold board gets reworked vs. a hot board?

No bottom side preheat, the heating is very localized to topside and only at the rework location. This has caused some excessive warpage under and around the rework location (hot board vs. cold bd.?)

Bump a nozzle and it falls off - this is a great thing when an operator has their hand underneath it!

carrier equipment that we have is rough. you have to slide it around on a table to get it in the right position etc...

And finally thanks for the compliment, You are right, we don't have to do a lot of rework! But when we do, I like to ensure that every single component and board goes through the exact same process. Instead of leaving it up to an operator.

I do however still use the chipmaster on occasion for various things

Russ

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APE South

#1758

Re: Rework | 10 March, 2000

Russ,

I still don't understand where you're coming from! The chipmaster is a closed loop system...it has a thermal couple. Also, I've got profiles on mine! If you're having problems with a loose nozzle just tighten the four set screws in the block....This is very elementary. 60 seconds....done fixed...next!

I've got one of my Chipmasters working with a Dragon pre-heat unit. The Dragon is one fine son of a bub! Very powerful! Solves my warpage problems. If I have to work on real big boards I'll get a hot plate....

Doug

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Casey Scheu

#1759

Re: Rework | 10 March, 2000

Russ, As I stated earlier 100% satisfaction guaranteed. I'd like to address a couple of your problems.

1. Lack of TC control. I don't really understand this issue. The system is a closed loop system w/ the TC located directly in the nozzle block. Perhaps your TC is bad or the unit is out of calibration. The unit is equipped w/ a built in digital timer that records the removal time. The unit then counts back down to zero for the install. This is used to obtain the optimum rework time. Using the same time to install, as to remove, reduces the likelihood of overheating. This is very important because as you mentioned sometimes the board is hot and sometimes it's cooler. Rework is not an exact science. If everything went as planned there would be no need for rework.

2. Bottom side heat. Your right the unit does not have bottom side heat and warpage can be a problem. We have come up w/ several systems to deal w/ this problem. There are also some add-ons to your current system that can be looked at. (Dragon)

3. Rough carrier/Nozzle falling off. All it takes is a call. Sounds like some basic service is required. There is a set of washers located under the button head screws that hold the nozzle on. Take a flat head screwdriver and slightly bend them up. This will apply pressure on the nozzle flange and keep your nozzles in a fixed position.

4. Utopia Engineering We all have rework. It seems your aware the less choices an operator has the fewer the problems that arise. However, the operator is the one doing the work. Following the exact process for every chip is sometime not economical or practical. I agree, if you can get operators to follow the exact procedures every time this would be the preferred way. Most times this is not the case.

5. Still using the Chipmaster We must be doing something right.

100% satisfaction. I'm not just saying that. It sound to me like you bought this unit several years ago from a private label distributor. If this is the case you�re entitled to a free overall. Please call me and I'll give you an RMA for a total overhaul of your unit. When the Chipmaster is shipped returned back to you, I can send an application engineer in to set the unit up and train your personal. As a customer of APE I want you to feel satisfied that you have received value for the money.

Please call me or come by the APEX show, I'd really like to meet you.

Casey Scheu casey_scheu@apecorp.net www.apecorp.com 305-451-4722

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