Landracing Forum
Fundraising, For sale, and Wanted => Items Wanted => Topic started by: wobblywalrus on February 10, 2016, 09:32:33 AM
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Does anyone want to sell a tubing or round anvil micrometer that reads to the nearest .0001 inches? It will be used to measure the thickness of crank and rod bearing shells so a reach from 0 to 1/4 inches is OK. I am willing to pay for a first world quality tool.
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Wobbly, I have found that an inexpensive way to go is using a ball mic attachment. I have regular ball & tube mic's but the ball attachment is quick & very accurate.
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I am willing to pay for a first world quality tool.
I don't know who to credit it to, but you're wise to adhere to the adage, "Only a rich man can afford cheap tools".
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Good suggestion Dynoroom. I have both and find the attachment the easiest. That way the mic you are most familiar with the feel of is being used.
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I use one of these. They come with a round anvil (carbide rod) as well for measuring tubing or internal radii. Swapping the anvil usually does not change the zero. Starrett is tough to beat in terms of quality too.
(http://imgs.starrett.com/image//220XFL-1e50746cUSp1?wid=1200&hei=1200&qlt=90,1)
Here is a link showing the various operations. Was a good purchase I made many years ago. Don't use it often but when needed I am glad I have it.
http://www.starrett.com/metrology/product-detail/Special-Fuction-Microme/Micrometers/Precision-Hand-Tools/Precision-Measuring-Tools/220XFL-1 (http://www.starrett.com/metrology/product-detail/Special-Fuction-Microme/Micrometers/Precision-Hand-Tools/Precision-Measuring-Tools/220XFL-1)
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http://www.ebay.com/sch/i.html?_odkw=tubing+mike&_osacat=0&_from=R40&_trksid=p2045573.m570.l1311.R1.TR3.TRC2.A0.H1.Xtube+micrometer.TRS0&_nkw=tube+micrometer&_sacat=0
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Or in a pinch you can put a clean wrist pin in a vice and lay the bearing insert over the pin and mic both of them and subtract the pin dia.
Works as long as the pin is clean and has no scores, and the bearing is new.
Not quite as handy as the accessory ball anvil but will get the job done if all else fails.
Down side of using a pin is it is a line contact instead of a point contact so you have to be sure it is not at a slight angle or sitting on a minor blemish on the bearing.
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we use the ball attatchment at work all the time, and for measurement accuracies for less than .001" It works for us. We also tend not to have mic's that read in .0001 increments... instead we carefully callibrate our mics and then interpolate the numbers. It'll get you within .0002" with some practice.
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Thanks for all of the advice and I read everything. What I did was to order a Mitutoyo 115-313 tubing mike. It has a ball ended rod type anvil that can fit into all sorts of holes, nooks, and crannies. This is something I need often so the $135 purchase price is worth it. The Starrett mics needed to be special ordered with the .0001 vernier so that made the Mitutoyo clamp look good. The word "clamp" comes from my past. One of my kids was doing an art project and they clamped everything together with my micrometers while the glue dried.
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Thanks for all of the advice and I read everything. What I did was to order a Mitutoyo 115-313 tubing mike. It has a ball ended rod type anvil that can fit into all sorts of holes, nooks, and crannies. This is something I need often so the $135 purchase price is worth it. The Starrett mics needed to be special ordered with the .0001 vernier so that made the Mitutoyo clamp look good. The word "clamp" comes from my past. One of my kids was doing an art project and they clamped everything together with my micrometers while the glue dried.
I both cried and laughed a little at that. It's hard on the equipment but sure does make an endearing family story.
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Thanks for all of the advice and I read everything. What I did was to order a Mitutoyo 115-313 tubing mike. It has a ball ended rod type anvil that can fit into all sorts of holes, nooks, and crannies. This is something I need often so the $135 purchase price is worth it. The Starrett mics needed to be special ordered with the .0001 vernier so that made the Mitutoyo clamp look good. The word "clamp" comes from my past. One of my kids was doing an art project and they clamped everything together with my micrometers while the glue dried.
Be careful they might be used as an adjustable wrench ! :-D
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Little kids are cute enough to get away with doing things like that. It is hard to get mad at them.
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Little kids are cute enough to get away with doing things like that. It is hard to get mad at them.
My first machinist job, there was a guy there that would wait for the head honchos to start a tour, and pull out his "mench." It was a broken 1-2 OD mic. As people were comming by he would pretend to use it as a wrench, then pretend to take a measurement with it. Management hated that crap. :D
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My first machinist job, there was a guy there that would wait for the head honchos to start a tour, and pull out his "mench." It was a broken 1-2 OD mic. As people were comming by he would pretend to use it as a wrench, then pretend to take a measurement with it. Management hated that crap. :D
I had a 1 inch Mitutoyo mic with the threads stripped on the barrel. Put in on the toolbox lid, open when the bosses walked by and the thing came apart into 2 pieces. Or borrow one from a pal, and then toss the Mitutoyo back to him a little short. As he dived for the tool, his eyes would bug out when the mic came apart. Big fun!
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One of my early machinists jobs required certifying all our measuring tools before every job! [Nuclear sub fittings!] One of our lathe hands gently tossed a 1" mike on his wooden topped work bench and the "older" German shop foreman walked him out the door! :-o :cry: