James Watt's end measuring instrument with micrometer screw,1776, probably the first screw micrometer made. Let's build one with what we have. For more information, check this video; • Why we made the plans ...
I had watched the James Watt micrometer video a while back. It seems to be a very ingenious instrument for its time. Lots of challenges for the build too. I like your "dive in head first" approach.
Really enjoyed that Michel, I found myself completely absorbed in it. You are brave to start a video series when you are not sure how some parts will be made. I like the sheet bender rig. I'll be back for the next part. Cheers
That is a manly bench vice you have there! Like it when you explain that you don't know how you will do something as it adds a bit of suspense to the project.
Hello Michel, great project, I've never come across the history of the micrometer myself. Like you, I am hopelessly dependant on imperial measurements and usually convert measurements when needed. Simplest conversion is 1.000 inch equals 25.4 mm, so inch to mm multiply by 25.4, conversely mm to inch divide by 25.4. Two simple equations makes it very easy if you have to convert things like tap drills and the like. Double check the calculation with a digital caliber as well. Enjoyed the video, cheers!
G'day Rusti. Awesome project. I collect micrometers, and I've wanted to build Watt's micrometer since I first saw it a couple of years ago. I'm delighted to watch along. And it great to see some precision tree parts in use again!
Good start to the project Michel. It is amazing that you started with a large piece of angle, then some cutting, cleaning up and shaping to end up with a nice looking main body of the micrometer. Looks like that first piece of sheet metal is hardened and it cracked when you tried to bend it.
I've been watching this project since it started... it will be fascinating to watch you build it... I'm English but I don't understand imperial... so I love your plan to do it in metric.
Great project to build !! Did I hear right? The print is in imperial measurement be wear if you change to metric as it may change your dial readings on the wheels ,, when we started using metric and trying to change it back never worked out good at the end so I bought a metric tape??
G'day Rusty. At first glance what a complex project, so many holes & fidley bits 😊😅😮. But in a Rustinox Way, a few pieces of scrap, suddenly start to take shape in a Historical Way. You have your first few pieces of Art. Well done, looking forward to the rest of the Project.
@@Rustinox maybe. You can make that edge thread by spinning a single point in a boring bar against stock held in your tool holder. My long term project is a chain drive clock, 20 ft in diameter.
I’m so happy you took off the ear muffs I was telling you it’s too thick lol 😂 and also they just invented a wet substance called paint it’s new try it on the base 😅
Let me explain imperial in a way a metric person can understand. Answer these questions. Start with 100 mm.... What is half of 100? It is 50. What is half of 50? 25 right? What's half of 25? 12.5 What's half of 12.5 6.25 What's half of 6.25? 3.125 What's half of 3.125? 1.5625. Does this make sense in metric? I believe that should be pretty easy to understand. Start with a whole 100% of something and just keep cutting it in half. We'll if you can grasp that, then you innately understand imperial. That's all there is to it. Where people get frozen in fear is because it is represented in fractions and folks think they have to do math in fractions and it gets very confusing. Forgot about fractions. They are just symbolic place holders for the stations of cutting something progressively in half. There's more to it obviously but thinking in those terms should allay your fear and discomfort and allow you to visualize it better.
Hi Rusti, Fly cutter good and bad , check tool not negative rake cutter on it as come round to cut could be rubbing not cutter grinder tip a bit or get 1 with clearance when used for turning. Steve in UK ish 😂
*It's not confirmed to be the first micrometer or that it is even a micrometer at all or that James Watt built it.. Doubts exist that it was built in 1776 but rather 1876.* "The first ever micrometric screw was invented by William Gascoigne in the 17th century, as an enhancement of the vernier; it was used in a telescope to measure angular distances between stars and the relative sizes of celestial objects. The London Science Museum contains an exhibit "James Watt's end measuring instrument with micrometer screw, 1776" which the science museum claims is probably the first screw micrometer made. This instrument is intended to measure items very accurately by placing them between the two anvils and then advancing one using a fine micrometer screw until both are in contact with the object, the distance between them being precisely recorded on the two dials. However, as the science museum notes, there is a possibility that this instrument was not made c.1776 by Watt, but 1876 when it was placed in that year's Special Loan Exhibition of scientific instruments in South Kensington. Henry Maudslay built a bench micrometer in the early 19th century that was jocularly nicknamed "the Lord Chancellor" among his staff because it was the final judge on measurement accuracy and precision in the firm's work. In 1844, details of Whitworth's workshop micrometer were published. his was described as having a strong frame of cast iron, the opposite ends of which were two highly finished steel cylinders, which traversed longitudinally by action of screws. The ends of the cylinders where they met was of hemispherical shape. One screw was fitted with a wheel graduated to measure to the ten thousandth of an inch. His object was to furnish ordinary mechanics with an instrument which, while it afforded very accurate indications, was yet not very liable to be deranged by the rough handling of the workshop."
This is going to be a very interesting project Michel. I have already seen the videos on the Watt micrometer, and found it fascinating. I'm going to try and download the plans. Hope I can do this so I can watch along with your build. Good luck. Cheers Nobby
Hi Michel ☺ this is an interesting project, and the way you use whatever you have to build it makes it well worth watching, and must give you alot of satisfaction. Keep up the good work mate, thanks for the video, stay safe, best wishe's to you and your's, Stuart UK.
That looks like a complicated project, especially when it comes to translating from imperial to metric. Good luck with it. Do you have an email address you are willing to give out? Thanks.
Great Little project! Lots of problems to solve. It looks to me like you have gotten off to a good start. I'm looking forward to seeing how you engrave the dials. KOKO!
Nice project! You shouldnt have much trouble making the nut. I've made similar parts for the follower on my thread chasing lathe. Simply clamp the workpiece in the toolholder, the cutting tool will be a 60deg threading tool in a boring bar and put the boring bar in the lathe chuck, then screwcut as normal!
@@Rustinox Hmm, you can of course support it with the tailstock too, but I grant you, that is a bit small. Does the thread have to have the correct radius, after all there is no force going through it. If the answer to that is yes, I'd get an M10x1 tap, drill a hole in some larger material, tap it then machine away the excess material. Or, as a further thought, use the original technique I suggested but put the m10 tap in the lathe spindle. Looking forward to seeing how you do this!
Even as a dyed-in-the-wool inch man I agree it would be pointless to make something of no use to you. It should be pointed out though that the Watt Micrometer pre-dates the invention of the metric system by about twenty years.
Hello Michel. Excellent start to what will be an interesting series. As always, I love your inventive approach and use of materials available to you. 👏👏👍😀
Nice project Michel, for sure with your machines and stock of material. btw calculate the power of your handpress, you wil be amazed how little pressure you can produce with that. and the original ones to 😃
