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Off topic but I came across this page a while back - wonderful animations of the working of John Harrison’s remarkable timepieces - which I thought some of you might enjoy.

I remember a while back I posted about my preference for cast iron Unimat components versus pot metal. The recent posts bear that out. Dick http://www.homemadetools.net/ forum/ OFF-

Hi Tamra: It toy train world there are stories of whole locomotives reduced to dust from Zinc Pest. Folks open the box to find the motor and axles all that is left. At what I call the "toy Factory"

hmmm... that is clearly an alloy issue.? This brings a new image to file in my brain for the term "metal flake". I have never seen metal deteriorate like this! Thankfully, there is a secondary market

Fascinating to say the least, I hope I understood the previous posts correctly. This is more from the Zinc leaching out of the base material over time, than the finish and the base material expanding

Zinc pest has nothing to do with the storage environment. It is a metallurgical failure of the company who made the alloy. Get Outlook for Android<https://aka.ms/AAb9ysg>

In the early 70's I acquired several HO scale Varney F3 locomotives. I still have them. Over the years, a few suffered from "Zinc Pest". Others were ok. I have no idea when they were manufactured. All

There are a great many model railroad items that have been stored for decades in damp basements, even flooded, that had no effect on the zinc alloy.? So, it seems that moisture alone cannot cause

This failure is seen in some vintage morse code key bases as well. It's a shame as there is nothing that can be done about it. First I've heard of any Unimat products suffering from it though. John

I am happy my Unimat and accessories are cast iron. Dick -- http://www.homemadetools.net/ forum/ OFF- SET-tailstock-center-65965#post105972 http://www.homemadetools.net/ forum/s...995#post112113 (

Hi Gang: I'm also a model railroader, and this is Zinc Pest. Access to water is a factor, but that can just be high humidity. I have seen it in Lionel products from 2001, so it still happens. There is

I've read that "zinc pest" is caused by lead contamination in the alloy. Back when most folks were just mixing up a batch in their shop, where the term "pot metal" came from, they frequently added a

Agreed. Presumably all of the active ingredients are present in the mix when first cast (I was going to write alloy instead of mix, but I suspect that is where the issue lies.). Presumably that

Over many years of reading about this I can't recall anything I've read where environment mattered.? Either during manufacturing or storage. Charles E. "Chuck" Kinzer

Does environment play any roll?? The diesel loco my father had in which the powered trucks turned to dust was in an Illinois attic (heat/cold/humidity) for about 28 years before I stumbled on it.?

Yes.? "Zinc Pest" as mentioned.? Caused by impurities in the alloy. It is my sense that this is very rare on Unimat parts.? But one bad batch of the alloy can produce a bac batch of parts that will

Zinc pest, for sure. Paul [email protected]> wrote:

I have a DB200 lathe and the Vertical Column Headstock Adapter is in just the worst shape. None of the other casting on the lathe shown any of these signs. Anyone care to guess what caused this?

I use 4 mm polyurethane belts, which is about 5/32" To measure the length, I use an appropriate cord and wrap it around the pulleys. ?I subtract 10% of the length from the measurement determined in

Could be that cylindrical gauges match bearing sizes? They could be used to check machined bearing seats for prescribed fit. -- NapierDeltic