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Hi Circlip, I never said my Mitutoyo were dial - just my my Etalon calipers. Lets talk machine shop stuff not 8th grade writing.

I have seen so many apparent counterfits on Amazon that I just bought my Mitutoyo through a long established local machine shop supply house. I have a good set of guage blocks and i tested some cheap digital calipers I have and they were off by 0.001", or a bit more, at many locations. Good...

If the machinists were "union" and the draughtsman was "management" I had a similar experience. About 1971 I worked in a factory (Western Electric) with about 18,000 employees at that location. I was walking through the shop and bumped into a lady holding a tray of about 600-800 electronic parts...

Zeb, I am 74 years old and first learned 2D drafting in 1961. That was followed by a BSIE and 52 years of engineering experience in various industries. I love the Spitfire drawing and all its' dimensions. In retirement, I teach a few machine shop labs at a local university. The drawings the...

I have downloaded, installed, and tested NanoCAD. It works great and has great similarity to older versions of AutoCAD. I love it. HOWEVER, it is a RUSSIAN product and I will probably remove it from my computer because of that.

I teach, in part, a beginning CAD course at a local university. I have found a program called CAMotics very useful to simulate students code. It is a open sourse program and is totally free. You may like it to simulate your CAD code. Just Google "CAMotics".

On the topic of chucks, why do USA brand chucks (Cushman, Atlas, South Bend Logan, etc.) have only one pinion to tighten the chuck and China made chucks have 3? I would expect China's inexpensive chucks to have one pinion based on cost considerations. I suspect the reason is using the same...

Chinese made stuff can be variable in quality. However, Shars seems to carefully watch their supplier quality and i have gotten a quite nice 3 jaw chuck from them. I bought several of their of their 1" outside micrometers for the University where I run their Mechanical engineering machine shop -...

My engineering interest area is primarily other related topics. I had no idea firing a boiler was so complicated. Very interesting. Thanks. Henry

Like visiting any historic site, you may want to know more about it so you know what to expect. Try typing "Fort Hancock, New Jersey"into Wikipedia to start. Most of the Batteries (cannon installations) have entries in Wikipedia. You can get their names in the Fort Hancock article. Battery...

Rust can be a very strange creature. I belong to a historic group that is restoring Battery Gunnison at the Gateway National Park (NY city area). I have a WW2 vintage lathe, shaper, milling machine, and drill press alng with tools and tooling. The strange part is the machine shop is located in...

R123 is one of the refrigerants that has negative impacts on ozone and CO2. Check Wikipedia or other sources. As a hobby, I would not want to contribute these problems even in a trivial way.

One option I would like to mention is renting a 1 or 2 car garage in the neighborhood and putting in some insulation and a heater. About 1967-8, while studying for my BSIE engineering degree, I worked part time for a machinist who was getting all the aerospace jobs he could handle in a rented 2...

In the "old days", when I went to my University to get my BSME, I used a slide rule for calculations and had a "pocket protector". It had the University name on it. It keep my shirt pocket from getting stained from the leaking ball point pens/markers/highlighters used to note particularly...

I forgot to mention. You need a milling machine or an x-y table for this to work.

I just use a wiggler with a ball end. Move the ball up and down. The ball oscillations get smaller (to have the ball curve and the workpiece curve touch each other at the diameter of the ball. Then feed the table in 1/2 the ball diameter and 1/2 the work-piece diameter. Done carefully, you...

How did the Romans multiply Roman Numerals?

Years ago, there was a large ( 2 units each 300 megawatt) coal fired electric generating plant a few miles away. It used water from an adjacent river for cooling. My friend worked for the utility. One time they had an environmental problem - a large fish kill. It was winter (air temperature 20...

Politicians write laws like this one. They are mostly lawyers and they rely on experts in various fields to generate the specifics of what has to be done to accomplish their general plan. They cannot be experts in all fields. They cannot design new bridges, inspect old bridges, determine who can...

Thanks guys. The comments are very interesting and helpful. One metal research association, I forgot which one, said that polishing the tiny grinding grooves from sharpening a toolbit will reduce the welding tendency of aluminum. Anybody try it?