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Restoring an OLD, OLD SCHOOL cast iron surface plate. pics

rdn2blazer

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Years ago some of you may remember I bought a lathe and a bunch of other equipment. I had the lathe for a couple 2/3 years and sold it, it was just too small for me. Most of the equipment I sold off as well as I already had it, like a bench grinder, a drill press and a couple other items. I kept the machine tooling. One piece being this cast iron surface plate.

The guy I bought everything off of was a guy I worked at the same company with, my last machine shop as a matter of fact. He was the son-in-law of the guy named Ron who owned the equipment who was 91 when he passed away. Steve was selling off his stuff for his wife, the daughter of Ron. When he retired he brought his favorite pieces of equipment that would fit in his garage home to use after he closed the shop down. He had everything at home for more then 20 years, but got too old to use it so it just sat in his garage until he died. Poor guy.

Ron ran his own machine shop for over 20/30+ years or more, I really don't know how long, Steve said it was a LONG LONG time. The Logan lathe I had, he bought brand new in 1946. So I basically bought it from the original owner, who in fact taught Boyd Coddingtonthe famous car builder how to machine as a teenager as an apprentice in Rons shop when Boyd was a about 15 years old.

Anyways, I have had this surface plate for about 5 years now and when we moved it sat and 1/2 half of it rusted up in my garage since it had a box sitting on 1/2 of it. That side is just fine, no rust. So I needed to get the rust off it to oil it. So I used a large 7" X 2" knife sharpening stone with a course side and fine side to it. I lapped the rust using penatrating oil and the course stone on 100% of the surface. Then the fine side, then some about 320 sand paper using a precision ground flat block to lap it to a good finish. It still has some stains but the rust is gone and it still feels smooth as a babys back side. The rust did not pit it thank god.

It does not have a manufacturer name plate on it so I have no idea how old it could be. But, I can tell you if this was bought before they started making Granite surface plates that it is probably pretty old as was all his stuff. Could be 50 years or more old??? I have a Granite surface plate as well, but this old cast piece is just cool, and rare. I want to take and layout a pattern and drill & tap either 5/16 or 3/8 course thread holes all across it in a 2 x 2 pattern for tooling & fixturing. I dig the history this plate probably has even if I don't know about it. Buy the way, I helped clean out Ron's garage as I was loading up my truck with stuff to buy.

I paid $2400 for everything I bought and later sold just the lathe for the $2400 I paid for everything. I have a ton of turning tools and all kinds of drills and machine shop stuff I kept. Steve, the son-in-law told me Ron would hide money in his garage so don't be suprised if I find an envolope with money in it. When I took a look at this plate in his garage I just happened to flip it over and sure enough I found an envolope with $500 bucks in it folded and taped up inside the square ribbing underneath.

I of course gave it to Steve for his wife. It was the first bit of money we found and were excited it was true. That day we ended up finding a total of $1700 bucks hidden in his garage. Needless to say his wife was happy. And, I'm happy I was able to buy this old piece of what I consider machine shop history.

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This angle block was also at my last machine shop and had been laying around for years and years. I asked my boss what is was for, he said it was when a piece of equipment had been delivered, and it was bolted to the pallet and the machine. I asked if I could have it, he said sure. So I squared it up on the Mill and machined one surface flat, then flipped it to machine the adjacent surface square to the first machined surface.

I've had it for about 6+ years now. It too has rusted up just a bit so it's next for scotch brite sanding to get the rust off. It's not near as bad as the surface plate was. Real precision angle blocks are NOT cheap, but this was a free, I just had to make it precision myself :D.

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We have a few "home-made" angle blocks almost identical to that one at the shop. We use them primarily on our horizontal mill. One of them we indicated and keyed so if you're doing quickie stuff that isn't super precise you can just drop it on the table, lock it down and you're within .005" - .010" without much work.

Cool stuff! I love old machine shop tools. It's beginning to be a lost art with all the schools pushing CNC. My manufacturing degree is 100% CNC based but I pay the bills with a 100% conventional machine shop job, go figure. :dunno:
 
We have a few "home-made" angle blocks almost identical to that one at the shop. We use them primarily on our horizontal mill. One of them we indicated and keyed so if you're doing quickie stuff that isn't super precise you can just drop it on the table, lock it down and you're within .005" - .010" without much work.

Cool stuff! I love old machine shop tools. It's beginning to be a lost art with all the schools pushing CNC. My manufacturing degree is 100% CNC based but I pay the bills with a 100% conventional machine shop job, go figure. :dunno:


If I ever can buy a mill I'll key this one as well. Just makes it easier indeed. I have alot of tooling I've collected over the years and yes I love old machine shop tools as well. Just something about the history of the trade and old school tools I dig.
 
To get that plate back to the true that it used to have, it would have to be scraped. But, if you just want it for general use, what you have done is probably good enough.

If you are interested in old time engineering, I cannot recommend Porter's "Engineering Reminiscences" enough.

You can find used paperback reprints on Amazon, or read it for free here.

http://books.google.com/books/about/Engineering_reminiscences_contributed_to.html?id=WwxLAAAAMAAJ

When this guy was doing his work, you pretty much had to make everything. There is a chapter in there on his having a surface plate made.

It seems that you have to make three of them at once.
You surface them to get them as close as you can, then start scraping.

You coat two of them with ink, lay them on top of each other and gently move them slightly.
Everywhere there is a high spot, you see it shine where the ink was worn off.

You scrap down those spots, recoat and do it again.

Eventually you get more and more spots and they get smaller and smaller.

But, you have to rotate in the third plate, otherwise, you can get two plates that are sloped or cone shaped but are mirrors of each other.

This old guy had a heck of a life. He met people like Rankin, Mr. Pratt and Mr. Whitney, saw the first twist drills ever made, and bought some for his shop.

He was always searching for "perfect truth" in his machines. In other words, high precision.

It just so sad that he died before getting to see a Johansson Block. Also known as a Gage Block.

That book will give you quite a respect for the way things used to be, and might just make you a fan of steam power.
 
I wish I had followed through with my precision machine degree. After high school, I got a job in a shop and realized really quick how boring production machine work is and didn't pursue it in college. I love my job in Instrumentation and wouldn't want to change at all, but I miss doing the one-off machine work I got to do in high school. I need to look into a little lathe and mill or one of the cheaper combo machines you can buy now for around the house stuff. :D

and might just make you a fan of steam power.

Oh, and J, I've always been a fan of steam power. I work around recovery boilers and refuse to leave this area of the mill because of our turbine feed water pumps, FD/ID fans and general steam production. Only other place to play with turbines is the power house and I don't have the seniority to bump the guys who work there.
 
If you like steam power, then go ahead and splurge on that book in paperback. The guy who wrote it, Porter, invented the first practical governor for steam engines.

He lived through a large part of the industrial revolution, and told it on a first hand basis.

He had a thriving steam engine building business. I don't know if the pictures are in the paperback, but there are some in the original signed copy! that I have.

They built them big in those days. There is a picture of one vertical engine that a man could comfortably stand up in the cylinder.

Also, if you ever want to go CNC with a mill, you might want to look at this outfit.

http://www.tormach.com/

I installed one of their 1100 series up at the tool and die shop I consult for about 3 weeks ago.

It seems to do more than the size would suggest, and runs on single phase power. Just buy their computer for it, and get the deluxe base and coolant tray. Its worth it.

Its not cheap, but compared to some of the full size machines, its almost free......

And its about the same price for it as a retrofit for regular mills like Bridgeports, or even Rong Fu.
 
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