What's inside of a digital micrometer ?

I attempt to repair some workshop battle damage.
Camera: Nikon L820

[@shawnmrfixitlee6478]

Great fix Rob , YOU SAVED IT !!

[@johnmacdonald6201]

That was a great save, back in business again, way to go.

[@rayfalcone6897]

talk about patience,,and wow you were lucky that you did not get hurt in the process.....nice job on the repair and another great video, well done.......

[@EddieTheGrouch]

This happens a lot in my shop where Pear Shaped is a step up! I get ebay/dollar store glass phone screen protectors and shape them up with those little diamond disks on a rotary tool. You may want to avoid super glue as it tends to gas off, wick everywhere, and it's brittle as heck. Something like rubber contact cement applied with a toothpick is good and cleans up easy with Naptha/lighter fluid (which doesn't melt plastics and paint). Plus, you might have to do this again and the rubber cement will peel off rather than chiseling off the super glue. A bit of tape and some nail varnish for the border and Bob's you're Auntie. Cheers

[@Xynudu]

Hi Eddie, Those cheap glass Android screens were my first thought and the Dremel diamond wheel was the way I envisaged doing it. I will go the silicon route I think. Will give the slide covers a go first. Thanks for the feedback. Cheers Rob

[@ronsites2694]

Great repair Rob! I would hate for you to go back to that old school stuff. Glad you weren't hurt.

[@Xynudu]

Hi Ron, Yes it was a major high velocity incident. I do like the easy to read display on this unit. The last digit in both measurement types is probably incidental given the accuracy of hobby lathes, but when doing locked down grinding it is useful. Cheers Rob

[@johncengia]

Interesting fix Rob, good learning curve. I saw & heard the monster Aussie blowfly 2nd time round.

[@cavemansmancave9025]

I was thinking the dragging might be due to a bent frame. Nice repair. Thanks, John

[@Sea-Dog5496]

Great Job Rob. I can sure relate to your video we have all done things like that. I still keep an eye open for one chuck jaw attached to the slide that took off from a scroll chuck on my bench top Delta lathe. I was removing them to clean out the dust and dirt from the guide ways and turned on the spindle by accident. Then away went the one jaw with slide never to be seen again. I turned my shop upside down and have not found it as of yet. 3 years ago. It will show up one day. Great job and good run of luck on the mic. My self I would use a tooth pick and silicone to run a small bead with cover off again. :-)

[@Xynudu]

Hi Ed, I expected to get some brothers in arms with similar tales on this subject. One day it will turn up for sure. Keep looking. Cheers Rob

[@ronyerke9250]

ED Maynard -- Have you moved the lathe and looked underneath? I find the darnedest things under places that I'm sure they cannot go.

[@Xynudu]

I once found a missing object lodged in the rafters of the shed. What are the chances of that? Rob

[@ronyerke9250]

When my grandmother was still alive, I helped her move. When I moved the washer and dryer machines, I found a casmere sweater between them. Apparently, about 20 years earlier, she fired a housekeeper for stealing it. Gma expressed a little embarrassment, but did nothing to repair the damage to that housekeeper's reputation. I lost a lot of respect for Gma that day.

[@Sea-Dog5496]

Ron Yerke Hello Ron.. yes indeed that was my first place to look. In my case I saw the chuck jaw take off through the air up toward the ceiling but once I calm down it was not where i thought it should have landed. It is a bench top mini Delta lathe. This was three years ago, so I ordered new parts and gave up ever finding the jaw and slide. 😕

[@ChrisB257]

Sounds like maybe a need not only for eye protection but also a suit of armor!! Chance in a million that holder hit what it did! Totally amazing. Very interesting to see inside the digital unit --ribbon cable looks pretty delicate. Well - seems the LCD screen survived and so chances are if you can come up with a cover you'll be good to go. Microscope slide looks like good potential.

[@Xynudu]

Hi Chris, I thought you'd be interested, seeing as you just did a review on the unit. I just learned that tempered glass can't be scribed and broken, so I will try using a Dremel diamond disc in the lathe to cut it in the vertical mill slide. This will be a first. I'm not sure if this is worth a video. Cheers Rob

[@ChrisB257]

Oh, never remembered slide glasses as being that way. Could well be a diamond disc can do it - give a try anyways eh.

[@Xynudu]

I think you may be right. This is not my area of expertise. I had a close look at the slide edges and they appear to have been broken to size - not a clean ground edge. So I think I will try the Banggood scribe on one and see what happens. Cheers Rob

[@RobB_VK6ES]

Don't use super glue with the casing closed up. The vapours will condense on the glass, dry out and fog the glass. In any case I think you will be better served using a contact adhesive which will give a little under stress.

[@roleic7246]

while you showed the gap of the missing glass I thought a object carrier glass for a microsope would be a good option. And sure enough you had thought of the same thing too and you even had one and it even fits the width too. Hahaha I was surprised to see a small optical disc resolver in there because those have the fine grid on them but on such a small disc can never resolve 1000+ steps per revolution necessary in a micrometer. They need some additional sensors and electronics to interpolate between 2 lines in the resolver. In linear glass scales they do that too. The interpolation can be done in 2 ways (maybe more but I know only 2 of them). In the first they put the lines on the disc not exactly radial but at a small angle say 5 degrees and then they put a stationary pattern angled in the opposite direction in front of the light detector. When the two line patterns move past each other they create a moving moire pattern that sends about ten light dark spots across a second light detector ten folding the resolution. The second method is that the light detector does not only detect 2 states, dark and bright, but measures different levels of brightness which can multiply the resolution by a factor of 100. I guess by miniaturization and mass production these sensors and electronics must have become cheap. commons.wikimedia.org/wiki/File:Moir%C3%A9_pattern.svg

[@barrycass2820]

You should say to Banggood that you wanted to do a yearly review on it. The one with broken glass.

[@milantrcka121]

Glad you are safe. This could have done some serious damage to organic material!

[@Xynudu]

It sure took off with a bang. LOL

[@MrUbiquitousTech]

It was a Good Bang! Sorry...sorry.....

[@fredcarnes9763]

Watch this and thought you migjt like mine. I was cleaning my 3 jaw chuck while sitting at my work bench, somehow I dropped it and it landed on what was a pristine Borrani rim from one of my old Ducati bikes. I almost cried, the rim has a big ding in it and I haven't had the heart to look at it again since

[@Xynudu]

Oh no !!!! Why does this run away stuff always land on something precious or go down a hole or some other awkward place. Seems like life is a game and someone is having a good laugh making it difficult. I once dropped my six inch four jaw chuck from the ways onto my foot - which went black for quite a while afterwards, even with steel cap boots on. Of course it missed the cap and landed on the fleshy part on top of the foot. Nothing broken luckily. But I did learn that it's a good idea to keep the chuck face parallel to the ways when resting it on the lathe board, just in case it decides to roll somewhere. As they say Fred, shit happens. Cheer Rob

[@MrUbiquitousTech]

That is so my luck there, but still it's better to damage a tool rather than ourselves. You sure you want to be around nuclear technology? ;) Nice repair there Rob, you saved it! The video bomb from the Aussie fly was cool, I think he was approaching light speed there.

[@Xynudu]

I had to duck as it went by.

[@jeremiahhale5001]

You should see if you can clean up the in/mm label too. Good luck mate

[@AmateurRedneckWorkshop]

G'day Rob. When I saw the title of the video I thought maybe you had been watching too much AVE. Nice repair if you can cut the glass.

[@Xynudu]

Hi Harold. I think it should work OK. I actually read on a forum about doing this. I wasn't really a brain surgeon, but you probably guessed that. Cheers Rob

[@walt5797]

Yep that was a butcher's cannery alright. I wouldn't use super glue, might make a bigger mess, maybe some thin double sided tape? Or a real thin bead of silicone just round the edge of the glass.

[@inductor43]

Hi! Can you explain how a digital micrometer works? i couldn't see what was inside

[@stevewilliams587]

Waiting for the glass cutting video now ? 😎

[@Xynudu]

That would be a pretty short video.

[@davidmcinnes317]

use one of your carbide cutters to mark the glass just as sharp and hard as any cheap glass cutter is.

[@samrodian919]

You know what they say Rob, shit happens!

[@Xynudu]

It sure does.

[@horkinyorkin]

ought that fly was here, and it's minus 30c here!

[@johnkinnane547]

G'day Rob shit you were bloody lucky you didn't get hurt. However at lease you will be able to try the one you wanted. There is a good video on KZbin that shows what can go wrong with a bench grinder and for all those people who ware heavy gloves it shows you in graphic detail why you don't!, Good video Rob interesting to see what is inside one of these Mics all the best John PS well how arsy is that with the microscope glass and it's a near perfect size!

[@Xynudu]

Hi John, I always wear gloves with the wire buff as I've lost too much skin over the years without. I've never had any issue with a glove catching. Cheers Rob

[@raymondmarteene7047]

Hi Rob, Nice save, just a couple of questions, are you sure that was a blow fly? I know we get some pretty big dunny budgies here but come on 😂. Could you use a sharp carbide insert to score the glass, I’ve got some carbide tile cutters that work well, wouldn’t take much. Cheers Raymond

[@Xynudu]

Hi Raymond, Yep, that was definitely a B-17 super Aussie blow fly. You can easily tell coz it has a more pronounced drone than the P38 bush flies. Trust me, I'm an expert on this subject. I've got the $2.50 (with coupon) BG diamond scribe ordered and on the way. Cheers Rob

[@Gkuljian]

This is why when I am using a wire wheel I reverse the order of things. The part is fixed and the wheel is in my hand grinder. That really sucks. I can empathize totally. You might find a repair place that can get a replacement part.

[@mickdoherty8633]

Rob. Army Engineers have a motto, “we make, we break”. You do it in the other order. Nice fix! 👍👌

[@mickdoherty8633]

PS. You be pleased to know that when I looked the micrometer up on the Banggood site, the lock mechanism is now on the front! They must have listened to your earlier review. 😃

[@Xynudu]

No. That was the same image they showed when I reviewed it. The lock is still on the back. Banggood are a bit careless with what they put up on their web site, specification wise. I actually told them about the error and they did nothing about it. Rob

[@CraftedChannel]

What about a glass for a cell phone? They sell protective layers you can add. Not sure if it's simple to cut or not. You might drop by a jeweler for a tip as well. (video not finished at time of comment)

[@roleic7246]

In your place I would be thankful that it hit the display and not your eye... So you kept your eye light for only 60$. That is a good deal...

[@Xynudu]

I had heavy gauge impact resistant safety glasses on, as usual. I always wear these when wire buffing and using the drill press. I've had HSS drills jam and shatter a few times. Very dangerous situation. Cheers Rob

[@edmundooliver7584]

can it be fix without disassembly.

[@Xynudu]

Yes. Now that I know the glass fits from the outside (it wasn't immediately obvious) I could have prized out the bits with a small screw driver at the impact point.

[@aceroadholder2185]

You may pay through the teeth for brand name tools like Starrett....but they do sell spare parts. Spares from China are, well, spare.

[@1jtolvey]

NOT A ROCKET JOCKEY ???? :-) PS TEMPERED GLASS WON'T CUT .

[@berniesr]

you have to stop reviewing bangood stuff its costing me a small fortune

[@Xynudu]

Ha Ha Ha Ha.