Another way to use them into stack them side by side. Say you needed to measure a .375 hole + or - .001 you could use the .186+.188 = .374 and see if they fit. Then use .186 + .190 = .376 to see if they don't fit. This way your set can be used to go to .499. Don't forget your .0002 minus tolerance stacks.
Holy shit dude, at work I need to measure 12.02 mm hole and our pins only go up to 12mm, but we have everything from 1 to 12mm, so just gonna grab the 6mm box and give this a try.
@@davidjones2999 remember use the 5 mm and the 6 mm box to give yourself some room to sneak up on the hole. For instance use the 5.50pin and the 6.40 then the5.50 and the 6.45 pin till you find the combination that doesn't go.
also a calibrated minus set only means it's .250 =/- an allowable amount (spec) a 1 ten thousands mic can't be calibrated with an unknown pin value try using gage blocks
Stuart de Haro... I thought your video was to the point and informative. I left a reply to Charles Alford on his comment. Charles Alford... You are incorrect, when you purchase a "Plus" (+) or "Minus" (-) pin gauge set it means exactly that... the pins are made to specifically be either .0002+ or .0002- However when purchasing a set that supposedly is made to the particular engraved size... then you have to assume that there may/might be a "Tolerance" off set by +/- some degree, especially if the set has not been certified. That is why they sell the "Plus" or "Minus sets" otherwise they would just sell them as is and let the purchaser assume all negative or positive tolerances.
I don't understand. How can one have a Minus size, surly all sizes must be Plus. "A positive value" I may understand it as a tolerance value as explained by Charles Alford. +/- a small manufacturing tolerance of the pin gauge itself. which could be +/- .0002 as in the example. or perhaps , slightly undersized by -.0002 or oversize by +.0002
Plus or minus refers to the tolerance to which the pins are ground, not to an absolute dimension. The pins in the set shown can be as much as .0002 under nominal or they can be right on. You shouldn't count on a pin from a "minus" set to always be .0002 under or from a "plus" set to always be .0002 over. In my experience, the sets from the good makers (Starrett; Meyers) are usuall not far enough off nominal to measure with a set of mics.
Charles Alford... You are incorrect, when you purchase a "Plus" (+) or "Minus" (-) pin gauge set it means exactly that... the pins are made to specifically be either .0002+ or .0002- However when purchasing a set that supposedly is made to the particular engraved size... then you have to assume that there may/might be a "Tolerance" off set by +/- some degree, especially if the set has not been certified. That is why they sell the "Plus" or "Minus sets" otherwise they would just sell them as is and let the purchaser assume all negative or positive tolerances.
@@bisonuberti That's not what spec ZZ means. ZZ minus spec means the pins are finished to within +0.0000" to -0.0002" with a finish 10, along with other dimensional specifications. A ZZ minus that reads -0.00015 or -0.00010 or ±0.00000 is within spec. I am not even sure how to measure ZZ with digi calipers, many of the near $400 calipers only have accuracy to 0.0006" with resolution of 0.00005".
Very helpful video, but if your high-end tolerance is .225, shouldn’t the .225 gage be acceptable to fit? .226 would be the right gage for the No-Go side since it’s just outside of your max tolerance, correct?
Anyone here do know how to maintain or correctly keep it in the storage? After use i drip a SINGER machine oil and wrap it in a paper and put it back, 1 piece i forgot to clean it up and put it back it begin rusting a bit.. or should we just unwrap clean the grease and put it back like the video shows?
Are they stored in a temperature controlled room? If not, you can definitely have rusting problems, especially if you live in a very humid environment. It might also be your body chemistry. I know a guy who leaves rusty fingerprints on almost everything he touches. In either case, a quick wipe down with some light oil on a paper towel before you put them away should stop it.
Stuart de Haro thanks for the info.. i live in Indonesia, its tropical area, very humid and near the beech.. i always drip a machine oil and wrap it back.. 1piece is rust a bit coz i forgot to clean/whipe it after use.. well.. what choice do i have 😅.. forgot to mention i bought it 1,5years ago
Michael Idarecis there are smaller bore mics. I just posted that one. At some point you will need pins. Most smaller holes will be threaded so not sure what accy you will need. After threading, there are thread gages too
Never calibrate your mic with import gage pins. You may field check. Checking holes is often one of the most important skills on the job. Check entry and exit sides of your hole with your no go pin.
