I learned the basics in high school in the 1970's, nowadays kids don't even have shop class, what a crying shame. I'm a farmer and use what I learned daily. Thank you for putting up these videos.
Thank you very much for the help i sure loved learning this it is so new to me, and i appreciate the patience you had with me and thank you so much for the help i know i can count on you for any other problem i have regarding this, I live in Pearland Tx. and i have always worked in manufacuring industry, and for some reason i love learning more than what i know , i know i can do this, Blessings to you.
Thanks for the video. I needed to refresh my memory. The last time I used a micrometer was 14 years ago in college & I sucked using it. I need to refresh my memory because I applied for a job as a press operator in a factory & it requires using a micrometer for measuring what dies I need to use for the press. I got more studying to do. Thanks for the video. I hope more videos become available so I can get this down to a science!
My pleasure I'm glad you enjoy learning. I'm here if you need help, that's what I do. Funny I was just in Austin Tx a month ago. I hope you always learn something everyday! Bless you too.
got it thank you very much i love this video very helpful for being first time trying to read this i think i am doing great and i felt like a very quick learner thank you so much i will have more questions later thanks God bless you.
There is a screw on the end of the ratchet stop, if you loosen it you can pull the thimble away from the frame (it is on at taper). Reposition the thimble, tighten the screw, and recalibrate. Good luck and thanks for your post.
@zombieatradies @zombieatradies If I understand you correctly the zero on the sleeve disappears when the barrel is screwed down. If this is the case the sleeve is not tight to the frame. Put your adjusting wrench in the hole in the sleeve and wiggle the sleeve back and forth putting pressure on the wrench towards the frame. You should notice the gap between the sleeve and frame closing. Anytime you manipulate a measuring tool it will require re-calibrating.
I have 2 starrett 1 inch micrometers one is similar to ours a #436 and a real old one # T230FL. Both were given to me , the old one was frozen up so I kept using penetrating oil until it would begin to move and over weeks finally was able to remove the thimble and clean the threads . It has a ratchet built into the spindle that does not protrude and was never to free it up. It works and I just turn the spindle just so it stops. It's a bit more difficult to read because the marks on the adjustable calibration part are right at the very edge of the thimble. I never got the adjustment wrench or 1 inch calibration spacer. It read 0 yet if I could adjust the collar one turn CCW I could see the marks better as I can on the newer one. If I turn it open just .006" I can see the marks better like the newer one. I don't know if it's possible to adjust it .006" by turning the adjustment collar one turn . I doubt if I had the tool I could turn the collar.
What a find! If it has sat in penetrating oil and loosened the thread up the sleeve should be able to adjust, you should be able to put a wrench in the hole in the back of the sleeve and rotate it to zero. Alternatively the thimble should come off the threaded spindle, this often happens by loosening the screw on the end of the thimble (or unscrewing a two piece thimble). Once the screw is removed pull on the thimble away from the frame, it is on a taper. Simply realign the thimble to align the two zeros and tighten the screw. Good luck!
I have a question.... I have all my mics calibrated...althought I have one that the dadum is on the at 6 oclock to be zero and calibrated...is there a way to move the themble back to the side and be correct... I know how to move the dadum ...just not if I can move the themble ??
If there is no screw on the end is the thimble two parts? Can you unscrew half the thimble? I'm pretty sure the thimble has a taper that sits on the screw under the thimble. If you can get that to free up (usually pulling the thimble away from the frame) it can be repositioned with the zero on the thimble at the 9 o'clock position. Can you send me a picture?
Can you tell me how to make calibration adjustments on an old J.T.Slocomb micrometer? Mine doesn't the little hole put the wrench into. When I crank the thimble almost all the way out there is a notch on the barrel. Does some type of little spanner wrench fit into that notch to turn the barrel?
machiningmoments Thanks for the reply, but I gave the micrometer to a friends son after using a set of feeler gauges revealed it was no more accurate, or capable of smaller measurement, than my vernier calipers. After closer examination I noticed it didn't have the extra sets of markings on the thimble and barrel enabling it to measure down to .0001. It was only capable of .001. Looks like I'll need to buy a better one like in your video.
I recently bought a set of three micrometers off of Amazon and noticed that on the one inch micrometer it seems relatively easy to inadvertently turn past the initial reading stop point when the anvil points make contact. In other words, I zeroed in the micrometer using the included notch wrench but am dismayed to see if you apply any light tightening pressure the thimble will continue to rotate past zero due to whatever play is in the design. Is that normal or typical?
If you look at your 2nd last post you typed 2.265 rather than 2.625 looks like it was just a type-o. I think you have it! Yes the units are important, I'm in Canada and we work both in inches and millimeters...there is a huge difference between the two sizes. Good luck and thanks for wanting to learn.
I got that mic along with the lathe I got for nothing from a friend, I had my own mic so never used it and never really cared. But I just took a close look and found a small allen key un-opened in its plastic. I took off the friction stop and there is the adjustment. Maybe I'll try to take a video of it with my camera so others can have a video of the procedure.
I like how you explain the reading i would like to know how you convert the decimal into a fraction form, please this is the first time i do this and i would love to learn more, thanks a lot this was really helpful.
Can you tell me how to convert ruler measurements into decimals, i had a little trouble doing that too, for example one of my measurements was 1 1/8 how do i convert it on to decimal and how is that read on the ruler i don't understand that part well i haven't learned it, can you help please.
Thanks, i am kind of getting the hang of this i applied for a job and the application required Decimal form and fractional form. i got a .300 so would the fraction be .300/1,000, the other one was .875 would that be .875/1,000
There is no hole opposite the numbers on the sleeve? I have a couple of Central mics and I'm certain there is a hole. Try contacting the supplier (Google search) with the model number of the mic. If you give it to your kids you may spark the next generation of machinist! Good Luck.
This is on a mititoyo mic....no ratchet ... does have a small hole at the end....I didnt wanna force it on the standard using that hole...maybe thats the only way
Although you can just start to see the second graduation it's not quite to the second graduation (2 X .025). So the answer is .200 + .025 + .020 = .245"
If the size is .500 for example and we know the micrometer can read to 1.000 inches the fraction would be .500/1.000 The lowest common denominator in this case is .500 So .500 goes into the numerator (or top) once and the denominator (or bottom) twice making the fraction 1/2. Check out the Kahn Academy web site, scroll down to fractions then click on converting decimals to fractions. Thanks for the post. Good Luck
You are going to catch on to this one really quick! 1 1/8 is a "mixed fraction"...1 is a whole number so its always 1 we need to figure how to make the 1/8 fraction into a decimal number so the answer is 1.xxx in order to get the .xxx divide the numerator by the denominator or 1 divided by 8 Ok, you tell me what the answer is as a decimal!
Your first example is 3/10 the second is 7/8 Do you have a scientific calculator with an "abc" button? If so it will do the calculation for you. Assuming you do punch in .875 "abc" 1.000 =(enter). It should display your fraction. Now hit second function (may be a yellow arrow or a yellow 2nd) then hit "abc" (you may have to hit = again). This should convert it to a decimal. Repeating should make it a fraction again. Good luck with the job!
Close, again the 2 is a whole number so the answer will be 2.xxx to get the decimal 5 divided by 8 = .625 so your answer is 2.625" in the decimal system.
+Lau Huong This micrometer will measure from zero to 1 inch. The equivalent metric micrometer will measure from zero to 25 millimeters or 2.5 centimeters.
