Erwin: Responding to your questions:
>1. What is your minimum dross generated that triggers you to procure an SRS?
Your finance department probably has guidelines for the pay back of capital investments. Some companies use period of time to break-even. Others use a net present value calculation, based on their internal cost of money.
>2. For a 8 to 10 Kg of dross generated daily, what capacity of SRS capable of recycling these amount of dross without compromising other cost factors? Or I haven�t reached the required volume yet?
Last I checked SRSs come in 10 and 30 pound sizes.
Sample break-even calculation (using WAG numbers):
Daily savings using SRS = 8kg of dross/day * 75% recovery by SRS * 90% of the weight of dross that is solder * ($1.50/kg of solder - $0.25/kg of dross recycling) = $6.75/day Working days to break-even = Installed cost of the SRS / Daily savings using SRS = $20k/$6.75/day = 2,963 days = 141 months = 11.76 years
Figure this out for yourself, but most finance guys I know would not seriously consider projects with a 11+ year breakeven. Chrys, in an earlier thread on SRSs on SMTnet, calculated a 7 month breakeven. Yours is probably short also and I've just donked the numbers.
>3. Can you recommend a brand name of SRS for this amount?
SRS is marketed by Fancort (201.575.0610 fax 9234) in the US. Apple House in the UK developed and manufactures the "Solder Recovery System" (SRS). Either could give you a lead on your local rep.
>4. I am also thinking of converting to inert atmosphere, what do you think? Am I on the right track?
You bet. A nitrogen blanket on your wave solder machine will reduce dross formation, widen your process window, and allow you to use less aggressive fluxes.
TTYL
Dave F
|1. What is your minimum dross generated that triggers you to procure an SRS? | 2. For a 8 to 10 Kg of dross generated daily, what capacity of SRS capable of recycling these amount of dross without compromising other cost factors? Or I have'nt reached the reqiured volume yet? | 3. Can you recommend a brand name of SRS for this amount? | 4. I am also thinking of converting to inert atmosphere, what do you think? Am I on the right track? | | Please respond, | | Erwin Dorol | Electronic Assemblies Inc, Philippines | Have either one of you seen or used a SRS machine? I had | | | | | | one in for a demo - very impressive. The original model was | | | | | | a little too awkward for production to use, however, the newer | | | | | | model is a little easier to use. The biggest problem that I had with the machine was it's capacity - I think that they expanded the capacity. | | | | | | | | | | | | | | ----------------------------------------------------------------- | | | | I have used the SRS system from Fancort. My last company proved it out and we had been using 1 for over 2 years. They bought a second shortly after. I just finished writing an AR to purchase one for my new company. I will be getting the 30lb/bigger model you were reffering to. With a recovery on the average of 75% good reuseable solder, it wasn't hard to justify. In our case it will pay for itself in a little over 8 weeks. Anyone interested should check out Fancort's website @ http://www.fancort.com/products.htm | | | | | | | | Earl & Dave, can't we all just get along? hehe. JKidding | | | | | | | | Jason | | | | | | | See Dave, | | | | | | When the elders begin play, the kids have to but in. | | | | | | Jason, where the hell you been? Where's all your cohorts? Must be the holidays. Besides, I know you're hiding someting. What technical pot are you stiring now? No "Gates" paranoia here. | | | | | | Earl Moon | | | | | Who's paranoid? | | | | Nothing to hide Earl, I simply answered the man's question without all the proper english and sarcasum. | | | | | | | | | | | |
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