12-10-2014, 08:16 AM
(12-10-2014, 06:50 AM)PixMan Wrote: ...With the ISO shafts and holes tolerance system, you get a letter and numerical character pair for each, and it's hard to remember upper or lower case, which (shaft or hole) gets which, and what value is assigned to each. If you want to know the size, you have to go to a chart. As the range of diameter of the hole or shaft changes, the value of that alphanumeric character set changes too. How ingenious...
That and you run the risk of misreading the tolerance (7h) as the actual hole size
(12-10-2014, 07:24 AM)DaveH Wrote: ...metric 1div =0.03mm.
Who can count in 3's ................... goodness me! One has to admit that is silly.
That is silly Dave. My friend's little lathe that (conveniently) resides in my shop has .001" and .02mm graduations.
Tolerance is still something that I am not fully comfortable with. I must admit that when I watched Tom's latest videos it seemed very strange to hear him say a part was -0.000 and +0.003 and so he was aiming for something in the middle. Even stranger to hear him say that if the dimension was only to two decimal places he wouldn't even bother to take a final measurement.
Of course, having him explain why made a lot of sense but it just seems strange when I have been trying really hard to nail a dimension exactly, when in hindsight, I probably didn't need to worry.
I'd still like to see an actual video on it, as I think reading about it doesn't really do it for me on such topics.
Hunting American dentists since 2015.