my big ol' Mossberg

44 Walker you say...

 

Log in or Sign up to hide this ad.

That's not a trench coat, it's a serape. You'd be long since dead if you had to unbelt and unbutton a trench coat...

 

I'm to understand that you multiple pass calender your planchet sheets from a ~32 ounce Silver ingot/billet at a fixed speed of ~15 feet/minute. What maximum thickness variation can be achieved per pass? What type are the calender roll bearings (e.g. sleeve, roller, etc.).

Do you believe that a continuous process facility would hand calender, rather than coil/strip feed?

Do you offset incrementally, index & stamp your sheet then? All of the relatively high speed (i.e. Maximum ~300/min. with oscillating die for thin materials) systems I've designed are "in-line".

I don't know, as I've only designed proprietary installations, unseen elsewhere. It would seem that a continuous process should be strip fed to minimize handling problems, with infeed rolls/strips slit to width from the casting mills. This capability would generally be determined by material ductility, thickness, etc..

Your facility appears optimum for variable thickness "quality" products, produced at a relatively low rate. That mill is a nice versatile piece of equipment.

JMHO

 

Quoting Roger Burdette in a thread created by Dan Carr in order to inform Dan Carr = Gangsta.

 

Are these machines "rare" I mean to be that old it looks to be in hella good shape!

 

I assume so. The specific web page I linked wasn't selling anything.

 

No, but one of these days I (or someone else) will make a video of the coin press as well.

 

I do have "security" at the mint, although the amount of valuable material there at any given time is not that much (I mint in small batches at a time and then disperse them). As the other poster mentioned, I operate everything myself, or sometimes with friends. I do make fun "errors" on occasion

Those state quarter prints on the wall came with the coin press. I believe they were used by the press operator/inspector to compare with the coins coming off the press. This explains a lot more about the coin press itself: http://www.moonlightmint.com/artifacts.htm

 

I may not have employee expenses, but there are still a lot of other expenses. Charging more for an item will result in fewer of that item being ordered. But I like making smaller mintages anyway, so it works out.

 

Thanks for the info. I was interested to find out if, by chance, my rolling mill was US Mint surplus. Does the Burdette book indicate anything about the manufacturer of the US Mint rolling mills ? I've seen some videos (circa 1940) which show rolling mills that are a different type than mine. I have not seen any photos of US Mint rolling mills from 1900.

 

Every run and every ingot is a little different.
I can take a bar that is about 0.25" thick and have it down to 0.1" thick in about three or four passes. So about 0.05" reduction per pass is reasonable. But as the stock gets thinner, the possible reduction amount per pass also decreases. So a better way to think about it is 20% reduction in thickness per pass.

It is a rather informal process. After each pass I check the thickness with calipers and, if necessary, adjust the roller gap and run again.

 

You a ping pong player? Saw the table in the corner!

 

I appreciate the 2 cents, but i wasnt illustrating Eastwood's fashion statement. I was referencing the gun he totes as the outlaw Josey Wales - .44 walker, the barrel is so long, i cant conceal it under my carhart jacket

 

Not much in the last several years. I use it as a work table.

 

Yep. The documents cited in the books are interesting and useful. However, I've found Burdett's own commentary to be often flawed.

 

Considering he's basically a one man band. This must have been what it was like when he was playing

 

Do you ever have anything to say that's flawed? Please tell us. It seems as if Roger has put you in your place several times.

 

You mean like this: http://www.moonlightmint.com/burdette_rebuttal_post.htm ?

Here are some things that I "debated" with Burdette about in the past on other coin forums:

1) Burdette claimed that lathe lines on a blank hub would be 100% eradicated during the hubbing process. I challenged him to a $5,000 wager that I could show conclusively that they can remain after hubbing. He wouldn't respond to that. I performed my test anyway, and showed that lathe lines and other defects would still be visible after hubbing. Here is that discussion: https://www.ngccoin.com/boards/topic/382961-what-caused-spiral-marks-on-a-coin/

2) Burdette wrote that the central bands area of a Mercury dime reverse die was where the highest stresses were. That is exactly opposite of reality. The fields of the coin are where the die penetrates the planchet the deepest (and so that is where the stresses are highest). The stresses are also higher towards the rim, not the center. Most die cracks start in the fields near the rim.

3) Burdette promoted one of his books by mentioning that it contained a definition of the term "doré". He claimed that in the 1870s the US Mint had problems with high sulfide content in the silver doré they purchased from California and/or Nevada sources. I challenged that by claiming that doré does not contain sulfides. I requested that he (or anyone else) post any document where the US Mint referred to this problematic silver as "doré". He would not or could not.

4) Burdette stated that the US Mint's "burnished" coin products are just marketing hype and that burnishing the blanks has no effect. I have personally struck (using the same dies) raw blanks, sand-blasted blanks, and burnished blanks. The difference in the finished product is visually evident. The strikes on burnished blanks typically have the best appearance.

5) Regarding the casting of the "broken sword" Peace Dollar, Burdette posted that it should be iron. US Mint correspondence cited in his own book stated multiple times that the original castings were bronze. Nowhere in the book was "iron" mentioned. But Burdette still wouldn't clarify his "iron" statement: https://forums.collectors.com/discu...verse-bronze-cast-with-broken-sword-design/p1


If you like, go ahead and cite anything I wrote that you think is flawed.

.

 

The book discusses US minting operations for the period 1833-1937. Offhand, I can't recall specific passages about much of the equipment that was used, but there are many, including illustrations. The information I cited previously came from a rudimentary search of the Table of Contents. The Bibliography is about 15 pages of fine print. Note: The book comes with a CD that is not sold separately.

Chris

 

Fascinating!