ShopTalk Forums | Aircooled VW Tech & Restoration Help

Also remember that most fastener stores only stock in 1/4" lengths rather than the 1/16" and 1/32nd" lengths that the designs are made in so washer stacks should be limited to 3 or more if you shim under the head as well. If more than three washers in a stack then you should go for a spacer; the reason for three limit is that the washer don't always stack up straight or can move with time so the amount of head or nut force/area applied can be lessened.

Lee

Dune i am compulsive, and have close to 100 of those cheap harbor bins, Actually those bins initiated need to have all the hardware clean.
I did use gasoline
then purple green:)
also started playing around with vinegar, cola and molasses
it is only 2nd day and cola works the best, somebody mentioned about using concentrate form- like for big co2 drink machines.
Molasses need time for bacteria to grow, so after making 20 to 100 extract with water it has to be put aside for 3 weeks.
Vinegar made all the bolts light in color- results little less than cola.
I am just playing around so far in look for the result with the least of residual effect, or if it happens the easiest to rinsing.
Electrolysis residual is sort of hard, same as is phosphoric
....but i see guys that we all are on the same page!
I will put the container with cola on the vibratory sander to mimic the tumbler, dont want to disturb the treads (ive read tumbler does it to small extend)
I wonder how ultrasonic dippers attack steel rust.

Bottom line it feels so good to play with pre-assembly of parts while having clean hands after trying to match up the bolts and nuts (not to mention accurate torquing).

I seldom reuse fasteners unless I know their history: you never know if they have been over tightened or otherwise abused. You don't know how many cycles they have had which wears on the threads; if they were heated up to remove them or the engine itself overheated you might want to think twice about them as you may have changed their properites/temper. Sometimes people reuse fasteners that were designed to be single use and so on. Something to think about!

New fasteners do add up to $$$ but then so can fastener failure.

Lee

Vinegar......................................Cola.......................................Molasses

Vinegar cones whitest but rusts quick
................................................Cola comes out just right and does not rust
.............................................................................................Molasses so so based on 2 weeks dip

Ol'fogasaurus wrote:I looked it up and Cadmium (a by product of Zinc) is being replaced somewhat by Zinc “…Cadmium occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production. It was used for a long time as a pigment and for corrosion resistant plating on steel while cadmium compounds were used to stabilize plastic. With the exception of its use in nickel–cadmium batteries and cadmium telluride solar panels, the use of cadmium is generally decreasing. These declines have been due to competing technologies, cadmium’s toxicity in certain forms and concentration and resulting regulations.[2] Although cadmium has no known biological function in higher organisms, a cadmium-dependent carbonic anhydrase has been found in marine diatoms….” http://en.wikipedia.org/wiki/Cadmium.

With the problems with Zinc I was kind of surprised to read this but I think it is the “…anhydrase has been found in marine diatoms…” that may be most of the reason for this… an environmental reason.

Good catch Bruce but I am sorry to see it come about.

Lee

Cadmium is bit toxic in nature and is not advised to use in making batteries..I have got cadmium battery and performance is OK OK..

That is one reason there are numerous coatings for fasteners with more being developed all the time. There is not a one-size-fits all fastener protective coating nor, if desired, a pre-lubed fastener coating on them either.

On fasteners that require torquing or those that are designed so that you measure stretch rather than using a torque reading (quite often one time use fasteners) they have developed new coatings or pre-torquing/tightening that get you to the proper measurements quicker and more accurately.

If you really get into it: fastener choice, availability and all the other decisions that should be made is quite a involved thing.

Lee

i was taught that cad plating , when it corrodes is a cancer causer if inhaled?

also does blueing prevent rust? a lot of guns are blued and they still need to be soaked in oil not to rust i find?

its hard going by the sea, i feel your pain as I'm the same only in the UK, stainless is probably your best bet but its silly money!

andy198712 wrote:i was taught that cad plating , when it corrodes is a cancer causer if inhaled?

also does blueing prevent rust? a lot of guns are blued and they still need to be soaked in oil not to rust i find?

its hard going by the sea, i feel your pain as I'm the same only in the UK, stainless is probably your best bet but its silly money!

I have never heard of the carcinogen off-gassing during breakdown before. Some more information on CAD and other plating: http://db.materialoptions.com/ASETSDefe ... d_alts.pdf

Bluing of metal: note in the first line the word "partial": http://en.wikipedia.org/wiki/Bluing_(steel)

Stainless (aka CRES or SS) has both high and low points but you pay $$$ for the high points too. Grading of CRES fasteners, as I remember, is a bit different than steel; e.g., the CRES equivalent of grade 5 is a bit below the rating of a grade 5 steel bolt. You really have to do your home work before you do anything out of the ordinary.

at one of my last employers, we used the Blackfast line to perform a Black Oxide type of coating.
Good stuff, not too bad for you or the environment. Easy to use, but does require a bake as part of the process. Not even that expensive when factored for throughput, we bought one kit for about $1K, and used it for two years, with no degradation in performance after several thousand bolts/washers/nuts/special parts went through it.
http://www.blackfast.com/

It is approved by a couple of aircraft OEMs for replacement of the MIL-C-13924 that is originally used.

Rob

CAD is getting frowned on as I understand it, but I am way behind on steel treatments and should do some reading. A perk of my new job is I got to waste a lot of time learning about alu treatments, but man my head is full of words now!