"Watt" Micrometer

Dave R

A model of what is probably the first micrometer ever made. It's dated England about 1776 and attributed to James Watt although evidence shows it likely wasn't made by him.
Watt Micro Views small.png
A larger version of this image is available here.

All the screws are made and holes threaded. 28 component definitions, all solids.

HornOxx

...wunderbar and I love the way you present your "machines"

Dave R

@HornOxx many thanks, sir.

Rich O Brien

@Dave-R You plan to print that? Its a beautiful model.

Soon you'll be able to open a digital museum of historical devices

Dave R

@Rich-O-Brien thank you!

I don't plan to print this one although I suppose I could. I always work to make components solid in my models. Generally they are the cleanest and easiest to work with.

I suppose I could get a good start on a digital museum. Neat idea.

HornOxx

@Rich-O-Brien which is true
@Dave, assuming a liking and a at lest basic interest for such really so beautiful technical items, I ask myself, how do you come up with this or that??? (if I had to clear out my very old father's cellar, I could provide you with such material until, let´s say, up to 2089)

Dave R

@HornOxx

These things seem to find me. I come across various sources for dimensioned drawings of various machines and use them to make these models. I find them a good alternative to the woodworking models I tend to do for clients.

HornOxx

@Dave-R very understandable, and all the better that these kinds of things "cross your path [D: über den Weg laufen]", as we say here. I feel the same way, I do other (SkUp-)things for my private pleasure than the things I have to do to earn money...

Mike Amos

Another piece of artistic magic. The digital museum idea is a cracker too.

jo-ke

@Dave-R Beautiful model

Dave R

Thank you all.

For those who aren't familiar with reading micrometers, the lead screw which drives the moving anvil has 20 threads per inch. So one full turn of the screw moves the anvil 0.05 in. That moves the pointer on the small dial one division and of course the pointer on the large dial, a full revolution. The major divisions on the large dial indicate 0.001 in. I don't know how precisely the original lead screw's threads were made but a device like this can be quite precise in its measurements.