Tightest Angular Tolerance that can be Specified & Measured?
Tightest Angular Tolerance that can be Specified & Measured?
(OP)
I would like to know, what is the tightest angular tolerance that can be specified on a drawing which can actually be measured? We can specify 0.001" on a drawing & actually measure it, what would be the case for angles?
I'm seeing some drawings with a plus/minus .003 degrees
Any response will be greatly appreciated!
I'm seeing some drawings with a plus/minus .003 degrees
Any response will be greatly appreciated!





RE: Tightest Angular Tolerance that can be Specified & Measured?
So it really depends on how accurate your measuring tool is and how accurate you need the part. I have seen most nominal angular dimensions in the +/- 1/2 degree but if you need tighter then you need to figure out what you need and if you have the tools to measure it. Then determine if it can be machined with the equipment that you have.
RE: Tightest Angular Tolerance that can be Specified & Measured?
My question is, are there devices used in the shop that can measure a difference of plus/minus .003 degrees?
Any response will be greatly appreciated!
RE: Tightest Angular Tolerance that can be Specified & Measured?
Mike Halloran
Pembroke Pines, FL, USA
RE: Tightest Angular Tolerance that can be Specified & Measured?
Depending on the size, aside the above mentioned sine bar there are several possibilities, laser, tool makers microscope, or a comparator
RE: Tightest Angular Tolerance that can be Specified & Measured?
As to what you put on the drawing, first is it functionally required. If yes then you look at if you can make & inspect it. If you can't make it then who cares if you can inspect it.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Tightest Angular Tolerance that can be Specified & Measured?
Any response will be greatly appreciated!
RE: Tightest Angular Tolerance that can be Specified & Measured?
RE: Tightest Angular Tolerance that can be Specified & Measured?
Have you ever heard of position tolerance, it seems this would be a situation where it is appropriate & perhaps benefficial. http://en.wikipedia.org/wiki/Position_tolerance
If you are worried about specifying what you need rather than actually making or measureing it and want help with how to specify this then forum1103: Drafting Standards, GD&T & Tolerance Analysis may be a good place to look.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Tightest Angular Tolerance that can be Specified & Measured?
Regarding the angle, it was something that I was curious about. What do you do when tight tolerances are involved?
Any response will be greatly appreciated!
RE: Tightest Angular Tolerance that can be Specified & Measured?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Tightest Angular Tolerance that can be Specified & Measured?
Any response will be greatly appreciated!
RE: Tightest Angular Tolerance that can be Specified & Measured?
Which you can measure and calculate. I would suggest talking with your machinist and find out what tools they have available to measure and inspect parts with. Everything can be measured, given enough money to spend on the tools.
RE: Tightest Angular Tolerance that can be Specified & Measured?
Any response will be greatly appreciated!
RE: Tightest Angular Tolerance that can be Specified & Measured?
This avoids a tolerance on the angle as such.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Tightest Angular Tolerance that can be Specified & Measured?
hold .001 true position
this is generaly jig bore/grind tolerance.
some cnc mills can hold it.
if you need it apply it, leave it up to the
make or buy (sub contract)person
it's typical to sub contract work out if necessary.
yes a discription of the part would be better
& fit form & function.
RE: Tightest Angular Tolerance that can be Specified & Measured?
A good bench type sized machine with a good operator could measure relative locations within a few .0001"s.
RE: Tightest Angular Tolerance that can be Specified & Measured?
angular can be specifed as a basic so can the
x, y coordinates., it seems to me x,y basic would be easier.
RE: Tightest Angular Tolerance that can be Specified & Measured?
which is close enough.
RE: Tightest Angular Tolerance that can be Specified & Measured?
8<)
It's not how tight you can demand.
Nor how tight you can specify. Or "draw".
Nor how tight he can measure.
Nor how tight he can reproduce that measurement.
But how tight do you need it?
(Looking the other way, how loose can you afford to let him get it?)
Low cost, fast production, high quality.
Pick two of the three.
RE: Tightest Angular Tolerance that can be Specified & Measured?
The best way is to have good communication with the factory, about what the can and prever
So a real answer i can't give you here.