It's called an intrinsically safe micrometer. - Standard conditions for temperature and pressure are standard sets of conditions for experimental measurements to be established to allow comparisons to be made between different sets of data. - Bob you are a marvel. I have disassembled and cleaned two DTIs since watching your videos. I partially disassembled, cleaned, and calibrated 5 micrometers several weeks ago. I may have to go back and give them a more thorough cleaning after watching this. Thanks so much to you Bob, and to John, for these series on the maintenance of precision measuring instruments. It's funny that after watching John for so long your accents are now second nature to me, and I can understand every word.
I hope you cover the barrel alignment with the spindle barrel (Terminology?). I understand how to rotate the barrel for zero. Problem I have with some mic's is the number lines don't show when the spindle barrel is on zero. I hope yyou understand what I am trying to say. Love this new series. Big thanks to you Bob & John.
Hi Bob, Very interesting videos, the friction sleeve as it's called,if the adjusting hole is badly damaged & the sleeve is to tight to move put it in a collet then wiggle it out holding the frame this will grip all round the diameter of sleeve without damaging or crushing, it works every time, thanks again looking forward to more videos, from Coventry UK.
Just bought an "experienced" 4"-8" Moore & Wright. There was a Telex # in the box but I wasn't counting on customer support. ;) As the foam in the box was "disintegrating" I expected that's why the thimble was stiff but it just needed some oil. Your video was very informative. We quickly saw it in theory at school but for some strange reasons our machining teachers didn't want us to tear the school mics apart... I did with confidence with your help. Almost lost some microscopic parts from the ratchet thou. Might want to warn people about that next time.
Thanks BOB! Great content!!! I just managed to fix-up & recalibrate my late dads old micrometer which he said he got when he in the B.I. in the early 60s. Its a DRAPER & seems newer so maybe he nabbed it off YOU when he worked on Lynemouth in the late 70s. (Ron Wright was he) I dunno where the spring went for the rachet... probably lost years ago when i first dismantled it aged 10 =) I fix up old guitars so this will FINALLY come in handy .
thanks for the video ,i was taught at school NEVER spin the Mic like a football rattle as it puts side tension on the barrel threads and knocks them off cal.
Got one that was essentially rusted solid, had to electolyse it for around an hour in organic acid to get it to the point it would actually move again. Thanks for the lesson, just have to find a rachet mech for that one, as it had rotted away totally in the salt atmosphere.
Hi Bob, great video. I have M&W large thimble head but it doesn't seem it has a friction ratchet. Difficult to judge same torque using finger pressure. Is it broke or what? Thanks.
Nice work Bob. We use a stuff called Alltrans (phosphoric acid based , i think) in a ultrasonic cleaner to remove light rust from spark/wire (EDM) parts , it might be worth trying on your parts
Help ?! Mines fully closed and it doesn’t turn - which way shoul it turn and should I force it? The nibble at the end turns but the main shaft doesn’t move
hi I have not bin able to get replacement springs so I use a thin o ring cut the o ring and cut a small pace out and put it in where the spring went regards bob
Firstly thanks to you both. Bob I have a question I have a Moore and wright mic and it’s moving back snd forth on the thread. Haven’t gutted it open yet but is it a sign the screw is worn out or can this be adjusted out. Basically I have backlash in a mic😳
Hi I have inherited my father's M&W 940x 0"-2" and although in excellent condition, no rust etc but the micrometer seems to be ceased. I've tried soaking in light oil but still won't loosen. Any suggestions? or would Bob please consider refurbishing....please regards MikeB
I have a micrometer that has a large anvils, maybe 1/2" diameter. It is really gummed up with congealed oil. But I can't figure out how to remove the anvil to be able to dis-assemble. Does anyone know how to do this?
i have a mitutoyo 1 inch micrometer that has rusted a little but it will not turn at all. what do you reccomend to free the spindle i not want to put a wrench on it unless it only option.
Soak in hot oil for a while, boiling hot light oil, like air spindle oil, then let cool overnight, and try again. A few cycles of this will at least get oil into the shaft, though you might have to use a bath of hot water and electrolyse the rust off. 6V and a graphite bar electrode, positive to the mike, negative to the carbon, and some weak acid ( vinegar, citric, or just regular coke, diet or otherwise) for a few minutes after washing the oil off with a soak in thinners.
I bought a new set of 4 mics on eBay for £40. Great value! Only problem was you got a different reading every time you tried. Didn’t matter how you set them up they were total crap. Anyway they I sent them back and got a refund. So I would have to disagree about buying cheap stuff. Better to buy good brands even if they are a bit rough, then do a restoration on them like you do.
Miles. As Bob said "buy the best you can afford" If there are two mic's both made in China and one is £100 there is a reason that the other is £10. Don't write off al Chinese gear as crap, in China the philosophy is don't sell ten for £50 each sell a thousand for £25.
Absolutely fantastic. Could you get the corrosion off the barrel and spindle with immersion in citric acid solution? Or with electrolysis? Looking forward to the next installment. Dum-di-dum-didum...
Electrolysis, or let it soak in dilute coke with some aluminimum foil in contact with it, that will electrolyse the rust off nicely, plus the phosphoric acid will passivate the surface somewhat. Electrolysis use a graphite cathode, that will just make hydrogen gently and not make much junk.
I heard you say something about having barrels made in Taiwan, I actually have an in with someone who might be able to help, how many different barrels are there? Are they generally standard, or is each size and brand different? The part itself would cost pennies, it's the tooling for each one that is in the tens of thousands of dollars each!
I can’t place that accent. Is there an island I’ve never heard of around or near England? It’s not Irish north or south. It’s not Scottish. Some of the words sound close to an English accent but it’s only a few. It’s almost like he spoke a Norwegian language first but learned English from a heavily accented English or northern Irish area. It’s bugging me haha. I’d be very surprised it was a standard accent from any one country. Just got an old starrett #211 I’m fixing up. Thanks for the info fellas.
