View Full Version : "GLOAT i think?"
12-31-2005, 09:36 PM
swmbo bought me a 1-2 inch mitutoyo digital micrometer for xmas,anyway i stabilized mic. and my cheaper grade 2 chinese gage blocks for approx. 2 hrs. zeroed mic. to the 1 inch gage block .00000 then checked 2 inch gage block, came out at .00000 then checked mitutoyo supplied 1 inch setting standared, came out at .00000 all measurements were made with exactly 2 clicks on ratchet mechanism for repeteability,so can anybody see a problem with my test method`s. no i haven`t checked intermediate measurments but for a rough test i can`t complain.test certificate supplied with mic. shows a .00005 error at 1.210,1.605,and 1.815 flatness of measuring face .00000 for both anvil and spindle, parallelism of measuring faces .000024. can i use this accuracy in a home shop? i don`t think so but it`s nice to have.
now what does everybody use for cleaning mic. faces,gage block faces ect. i have been useing a cloth meant for cleaning eye glasses but am a little concerened about the cleaning chemicals affecting my results and etching gage faces[anal retentive]maybe but i`ve spent as much as i can afford to buy top quality measuring tools and don`t want to make any stupid mistakes. also if anybody cares according to msc, mitutoyo is discontinuing there earlier series mic`s and going with the coolant proof digital mic`s hope everybody has a happy and safe new year.
01-01-2006, 06:45 AM
What are you measuring as a HSM that is +/- .0005?
And, It is fun to play with a new toy, but give it a break.It is only a tool.
The tame Wolf !
Sure, you can use that kind of accuracy. If you ever make a model engine you'll need it, or at least appreicate having it.
I've always just used a cloth (piece of an old flannel bed sheet) and instrument oil. For gage blocks, I think you're supposed to used pure lanolin and chamois leather, if you want to be fanatical about it.
[This message has been edited by SGW (edited 01-01-2006).]
It's a good thing I can't measure to that level of accuracy or I would...
01-01-2006, 08:10 AM
Yea Evan, but we all know You are a perfectionist. http://bbs.homeshopmachinist.net//wink.gif
At vickers we kept vanes at +/- .000025 when grinding,and had to match the blades to the rotors.
Over .0005 takes the fun out of it.IMHO
Though there will be arguements.
The tame Wolf !
Your Old Dog
01-01-2006, 08:22 AM
My Stanleys have served my shop needs just fine over the years http://bbs.homeshopmachinist.net//biggrin.gif
I do think though that that the guy who fusses with extremey accurate measurements will have the effort show up in his work.
In my businiess we council the young'uns "Perfection is just a goal, we don't really expect to achieve it. And if you think you are achieving perfection on a daily basis it just testimony of little you realy know. The work can always be improved if you know how." (In the photography business true perfection would equate more with sterility or blandness)
And Tool Pig, I'll bet you'll enjoy picking up your new mic absolutly everytime you reach for it. If you're like me, the joy never goes away.
01-01-2006, 03:45 PM
TP, I don't think you need to worry about the faces. I've tried to pirate old thimble assemblies and reshape those mic faces, and nothing short of diamonds will even touch those bastidges. I've owned a 1" Starrett mic for some 35 years now, it is my 'go to' measuring tool. I clean the faces by lightly clamping on a sheet of paper, dragging off then checking zero. The paint is worn off in places, but those jaws look like new. Paper is generally not recommended, it's just always available. So I think you'll get adequate service life as long as you keep the chemicals away.
I finally broke down and bought some digital calipers a little while ago when they were on sale for $20. They work fine and agree with my two other dial calipers.
I don't like them.
01-01-2006, 06:29 PM
What didn't you like about them Evan? The $20 ones I had worked ok but I didn't like the feel. (just felt kinda sloppy) I bought the Mitutoyo ones and I use them all the time. Much better feel. That said I have a cheap digital micrometer from Grizzly (58. bucks if I remember correctly) and a Mitutoyo that cost a lot more. I frankly can't tell the difference between these except for the better finish on the Mitutoyo.
Paul in NE Ohio
[This message has been edited by PHiers (edited 01-01-2006).]
01-01-2006, 06:34 PM
Too tight of tolerances may make the truly anal feel good, hell, it aint fun to machine that tight if you dont have to.
Well, first I have to remember to turn them on. Also, when I turn them on I have to remember to make sure they are closed (I know that better ones have absolute scales).
Second, I have to actually read them and figure out what the number means. With my dial calipers they are always "on" and if I am doing a quick check on a drill bit for instance I can instantly tell by the direction the needle points whether I have the right one.
With the digital I can't interpolate between the lines like I can with the dials.
I made a point of actually using them for a couple of weeks but still don't like the digital calipers as well as my dial calipers.
01-01-2006, 07:01 PM
Gee Evan I know the memory goes first but aren't you kinda young for that?? http://bbs.homeshopmachinist.net//biggrin.gif http://bbs.homeshopmachinist.net//biggrin.gif
The mitutoyo is absoute, another thing I like about it. Since they read to .0005 isn't that close enough for a drill bit?? http://bbs.homeshopmachinist.net//smile.gif
Paul (his memory went first and he can't remember what was second)
The point with reading drill bit sizes is that I don't have to interpret the reading, just see what direction the needle points. I can read that like reading words. Sort of like resistor color code, I don't see the colors anymore, I see them as values. I check nearly every bit I pick up to use as a basic sanity check, especially when tapping.