Originally Posted by Jaakko Fagerlund
Here a picture of my cylindrical standard
It is 4.325 tall and 2.500 in diameter ( 63.5mm x 109.855 mm )
There is a very faint etching on one edge that says
The Part number is 3680582 as I read it - The first , second and forth digits are smudged so those numbers may be 1,0, and 8 respectively
That means the first 4 digits could be 3680, or 1680, or 3688, 1688 , 3080,1080, 3088, 3688 , but the last three are firm as 582.
Super premium precision , for a very low cost.
Last edited by Rich Carlstedt; 02-17-2017 at 02:40 PM.
Come on, give it up. How much and from where? A quick google of that PN and cummins comes up with a couple vendors overseas and no prices.
Originally Posted by Rich Carlstedt
$13.30 from China. They even put "Made in USA" on it
Doesn't matter as long as it's not a mile off. Some nicer cylinder squares that are meant to MEASURE (not just act as a reference) are tilted purposefully so you can rotate them till it rests evenly on the side of your part then it tells you the error.
Originally Posted by JoeLee
Whenever you use a cylinder square you should always interpolate your indicator zero between the two extremes of sideways lean. If the square had .0002" of tilt from the base to indicator tip (well, measuring bumper to tip) then I'll set up my indicator to read -one tenth up to +one tenth as I spin the cylinder while in contact with the squareness comparator. Then I know my indicator is set to dead zero as long as the cylinder is parallel.
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