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We always used minimum 45% silver solder for braise-welding copper pipe to stainless steel. The flux was a liqid-paste containing borax and flouride compounds. As I recall the brazing temp was about 600 deg. C. The application was to pipe oxgen gas at 2,000psi. Fortune favours the bold and...

Machining PTFE is a black art and those that know rarely divulge their hard won knowlege for free. We sometimes make seals from PTFE but generally avoid using the stuff. It has a low modulus, low resilience, practically no compressive nor tensile strength and because it has high thermal...

nornrich in addition to the information supplied by unclesyd. I strongly suggest you look at the Kolsterising process or one of its clones. Choose 316L or a duplex type stainless, but preferably a ss with plenty of chrome, and Mo. The process allows carbon to form carbide compounds with Fe and...

Could this be he? Electro Adapter Sales Reps NJ, Tom Saxe Electro Adapter, Inc. 20640 Nordhoff Street Chatsworth, CA 91311, Tom Saxe, Ph: 818.998.1198 Fx: 818.709.5773 TSaxe@electro-adapter.com ... www.electro-adapter.com/website/eacrepdata/rep.cgi - 14k - Cached - Similar pages Fortune...

My project is a rectangular box of sorts that will be injection molded and I need to know what polymer will give me the equivalent properties of 1mm of steel or aluminum. I know that in most cases a "thicker" polymer is used to make up for the loss of strength. This is not an option for me. I...

When you send your resume in, assume at least three people will expect a copy. Send in three clearly separated, but original copies. That way you may just have the little edge needed.

"........Although the ball diameter is much smaller than the ring radius, its contribution to thermal problems could be also signaficant due to higher temperature. This way I explain to myself the superiority of oil-air lube in high-speed applications." Assuming other factors to be equal and...

Part cured phenolic resin dissolves into most alcohols and acetone is one of the more agressive solvents. We use acetone only for cleaning solvent. To test a phenolic part for cure, we rely on a special hot compression test developed in-house. Properly cured and partially cured phenolic resin...

I would also like to say that while acetone may be useful for extracting unreactants, over time and above acetone also attacks perfectly cured phenolic. IMO it is a destructive test therefore the test part should be isolated from and not returned to the batch.

'Standard Test Method for Acetone Extraction of Phenolic Molded or ... This test method covers the determination of the amount of. webstore.ansi.org/ansidocstore/ product.asp?sku=ASTM+D494-04 - 23k - Cached - Similar pages D494-04 Standard Test Method for Acetone Extraction of Phenolic ... 1.1...

It may be just as practical to ream them after galvanising.

Another take on TheTick's superb quote: "Decision is clean cut, easily mended, blended, repaired or removed. Indecision is ragged edged with loose threads and jams everything associated with it.

As long as carbon fibers are prevented from being in electrical contact with the metal part it should be OK. Longer term chafing might be worth considering.

It will be a "battery" only if it gets wet. Even if you use ss, if does get wet, it won't help if salt is present and can accumulate. Isolate the two materials with a creep resisting electrical insulator such as epoxy grp, heavy film Mylar from Dupont. Electrical insulation specialist suppliers...

I would not use PVC pipe for carrying water where ambient temperature is more than 50 deg. C. What does the supplier recommend?

According to my copy of Schweitzer's Corrosion Tables, Nordel (EPDM) is resistant to concentrations of NaOH between 10% and 70% through to "concentrated" while enduring temperatures up to 300 deg. F. As was swall's experience, it really depends what else is present in the liquor.

skoggs Yes, pretty much. The idea to replicate in static mode the maximum force the device might need to operate. I thought it might be easier and safer to measure the force as well as deflection with the spindle stationary.

I think skoggs is right in that it is just too difficult. Here is maybe a compromise. With the spindle running maximum, apply also the maximum operational load and somehow and record it. Turn the thing off and apply the same load but this time in static. Measure the deflection before and after...

haze10 Why not consider attaching a zinc anode so that it is in electrical contact with the universal joint? That should alleviate galvanic corrosion which is probably occurring between the submerged part of the 304 auger and the 4140 universal joint, and at least let you select mechanically...

Try this thread: http://www.eng-tips.com/viewthread.cfm?qid=107465