The Micrometer
ฝัง
- เผยแพร่เมื่อ 24 เม.ย. 2016
- From the series: MEASUREMENT in the METAL WORKING INDUSTRY
(Loucks & Norling Studios - 1941)
The micrometer endures as a critical instrument of
measurement in industry and engineering.
This film provides an excellent introduction on the
description and proper use of this important tool.
This is our own digital video created directly from a surviving 16mm movie print.
Museum of Our Industrial Heritage industrialhistory.org
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Love these old time trade films, so much detail and illustration.
This film is so true and useful for an Apprentice.
Then you applied your Skills and worked different Jobs for Experience and developing your Machinist Skills.
For a Job Shop, Time was Money, every Day after Day.
When you worked in Production, same part, different day
for months and months.
Then R&D, different part, every day for days and days.
Later, if you were good, you worked as an Engineer, Pencil & Paper, until you went into Management. Same thing..."When will you finish the Project?". I enjoyed being a Machinist.
My great grandfather (Boeing Machinist) left me hundreds of these steel rules, calipers, gauges, etc. These videos are great for figuring out exactly how they are all used correctly.
Take care of that stuff. Probably worth a few thousand depending on what you have. If you aren't going to use it, spray it all down with some WD-40 and keep it stored properly.
WOW! We DO NOT suggest the use of WD-40 for fine machine threads. Over time, the stuff thickens and eventually becomes a hardened glue. I have seen a number of frozen micrometers and other fine parts permanently 'welded' together by this stuff. Some we have not been able to recover. I am not a machinist, but how about mineral spirits? Anything which leaves residue when dry is a bad idea!
I used sewing machine oil on some, & light bearing oil that came with some mini-quad motors on any threads. I did use WD-40 on the outside to clean a few spots where rust was starting to show (nothing too bad).
Just to show how naive I was....I thought he must have loved drawing circles with how many different compasses he had. Really just full sets of inside, outside, calipers, etc.
All the micrometers test calibrated perfect still on his gauge blocks.
@@PowerScissor hundreds? he probably stole them from the factory
@@MuseumofOurIndustrialHeritage another idea is put some rice (dry) in a small cloth bag. Store that with the tools as a desiccant to control moisture.
I used them in Highschool, for my machine shop classes. It was a very accurate meassurement instrument.
Noticed some of the mics had tenths on them and this wasn't taken into account! 8:38 .7512". Probably hard enough trying to explain to a non engineer how to read one. Now you have metric mics with microns on. You need good spectacles to read those!
I love everything about this video. Good info and the I love seeing into the past.
This is great history and a very nice introduction to micrometers
They forgot to add the cranky foreman asking if the hot job was finished yet😁
So true, for a Job Shop, Time was Money.
When I worked in Production, same part, different day.
Then R&D, different part, every day for years and years.
Later I worked as an Engineer, Pencil & Paper, until I went into Management. Same thing..."When will you finish?".
Lol so true Foreman are cranky miserable bastards specially in machine shops
Hi, I want to say the job your doing is fantastic! Thanks so much.. M.K.S.
Thank you so very much for this video...Don
This video makes me want to research when micrometer manufacturers started using carbide tips.
Very good! I wish they had ratcheting mechanisms on the micrometers then so they could have covered that part too.
Overall great.
Weird, that you say that. The very first mike shown, at 1:13 - 1:24 has the ratchet extension clearly projecting out from the knurled thimble.
damn, somebody needs to machine a pair of nail clippers
Sorry but I see one possible problem with the telescoping T gauge. It has flat ends and will not therefore give a true reading inside a tube. Anybody else see that?
They are rounded. Still better off with inside mic. Less chance of error.
how to open main spindle
It's true it's suppose to always use the slip mechanism. But they also provide that big grooved surface so you can use it without the slip. The thing is made from very strong materials it's hard to break it.. you have to use considerable force.. I don't know maybe are people with lets say.. less gentile hands.. but if that's the case they shouldn't be using a micrometer.. The slip mechanism has some good points and some bad point.. a good thing is to use it when measuring things like paper.. copper and other soft materials.. the draw back to this is the force applied depends on the speed you turning.. so its very hard to always get the speed right.. and this can lead to different measurements.. For hard materials you can use the direct drive.. approach the thing gentile until you feel a small resistance so you know is touching the part.. you can then use the slip to see if it gets even tighter.. Sometimes when measuring round objects when the contact point is very small.. is better to use the hand because the slip mechanism can apply more force then necessary.. Hint! Its very very important to have the tool contact points and the pice very clean!!!
...AND... Mr1joh1smith... I disagree that with "gentile" (that means non-Jewish, btw) hands shouldn't use a micrometer. Why in H would I, with rough OR gentle hands want to NOT be gentle with a precision instrument? That's why they come in cases. Also, you say a mike is made of 'hard materials' and is hard to break'? Can't agree there- drop one on the floor a few times, and keep spinning the barrel quickly, and you'll be sending it back to the calibration lab... or uncle Bill's C-clamp collection. ;-)
It's 40 threads per inch. It doesn't take much to fuck up a micrometer, you have a pretty large mechanical advantage with that amount of thread.
Could the "Tom Watson" credited as a member of the committee be Thomas J. of IBM?
micrometers today either rachet or slip when they reach the right pressure.
The micrometer in this video had a ratcheting mechanism. Micrometers today only ratchet if you use the ratchet thimble.
The Good Operator
nothing compares with the explanation of an old school
why is it called a micrometer when it uses inches instead of meters? or why is it uses the metric system to fraction inches? just a thought.
I have used micrometer fot at leat 15 years... I have always swing them. I am swinging one right now.
They make good adjustable spanners! (Joke)
Call the device Micrometer use inches as a scale. America xD
I wonder who the target audience for this was. It seems like it's intended to help the viewer to understand what's going on when they see someone else using a micrometer, not to teach the viewer how to use one.
This was made in 1941 so I assume it was made to educate workers for war time production. Particularly women.
It's rather difficult to teach someone to use a mic without them being able to hold one in the hand. The feel for one cannot be taught without hands on practice.
That dude needs to chew his finger nails off!
this guy forgot to buy nail clipper's
This film is not very good at all.
They did have ratchet and clutch micrometers back then (they are described in my 1941 Burghalt/Axelrod/Anderson Part 1 - a standard text on machine shop work since the 1920's. Mitutoyu's online history shows rachets in use pre-war) and a ratchet micrometer is shown in the film. But for some reason the actor (it has to be an actor and not a qualified machinist - directed by a fool scriptwriter) consistently ignores the ratchet and incorrectly advances the spindle using the thimble.
The film also shows an airbrush drawing of a Vernier scale micrometer, which enables measurement to 1/10,000th's, but ignores that and consistently explains reading only to 1/1000th.
If I caught a worker in my shop holding, jiggling, and using a micrometer like they do in this film, I'd sack him.
I am not a metal working professional, but this film taught me the basics and I now own a micrometer and use it regularly. I am not sure if you are commenting on the same thing, but one part of the film demonstrates exactly how NOT to treat the instrument. This film was part of a series. Vernier scale micrometers are explained in another film, which I also have available on this channel. Doesn't that other film explain how to measure greater degrees of precision?
@@MuseumofOurIndustrialHeritage I searched on and no such film on Vernier scale micrometers was listed. Can you give the url?
This film has a section at the end where is tells you obvious methods of abuse eg allowing grinding dust on a micrometer, allowing it to drop, and the like, but, as I said, the operator is shown using a micrometer with a ratchet (micros without a ratchet or clutch were at one time sold for measuring sheet thicknesses where full accuracy is not required) but ignores the ratchet every time. That is just as much a form of abuse.
A Vernier scale micrometer as shown later in the film, correctly operated, is capable of accuracy within 1/10,000 inch. Used as in the film you would be lucky to get within 1/1000th, and you would quickly ruin the micrometer threads.
What you do with your micro in any hobby is your affair, but wind it in using the thimble as shown in this film in any shop and you would get the sack. You would get instant sack in my shop, and I would deduct the cost of a new micro from your termination pay.
If you're experienced, you would never use the ratchet anyway. I keep an 0"-1" in my breast pocket. I probably use 100 times every day. You can FEEL the micrometer. Check it at least once every day with slips.
Keit Hammleter perfect chance for you to upload videos on how you see these tools being used properly