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Tolerance on Fillet Radius

S

SnapMachine

Plastic
Joined
Aug 15, 2020
A face groove on a part has a bottom fillet dimensioned R.02
The title block has the two-place dimension tolerance of +/-.02
Will this allow a zero (0) fillet radius on the groove?
 
SnapMachine said:
A face groove on a part has a bottom fillet dimensioned R.02
The title block has the two-place dimension tolerance of +/-.02
Will this allow a zero (0) fillet radius on the groove?
Click to expand...

Do you work directly for the customer? Ask and receive a marked up print.
Do you work for a boss? Ask and make him initial the print.
This question has been bandied about in every shop that I worked in. There is no official answer that I'm aware of. Demand a marked up or initialed print. It's called C.Y.A.

Eugene
 
Like Booze Daily said, there is always the radius of the tool. The customer is not the problem. In fact, the way I understand the drawing, anything LESS THAN .040 R is good. But I have an sob (son of boss) who thinks anything other than nominal must be dragged through the muck.
 
SnapMachine said:
A face groove on a part has a bottom fillet dimensioned R.02
The title block has the two-place dimension tolerance of +/-.02
Will this allow a zero (0) fillet radius on the groove?
Click to expand...

Yes infact
I see this on customer drawings many times, if it's on the drawing your good to go,
so technically any standard tool between 0-.040 is legal, it's on the drawing.
but most tool have a standard radii, like .015,.020 .030, .040 EG
I try to be under the height of the slot so it is easier to measure, for example if the
groove has a depth .025 inches, I would use a .015 radius tool or insert.
makes life so much easier, MY two cents
Stay Safe
 
Technically the zero is okay.
File this under how to get into an unneeded argument with the customer.
One can be 100% right to the print limits or callouts and never get another order.
Would think a .015 okay but maybe seen as sloppy work. Is the .020 a problem?
Bob
 
Technically the customer has to accept it but he might not like it.

Depends on the circumstances but:

Can you use a .015R tool and generate a .020R with the program it this runs on a CNC?

Can you lightly stone the corner on a .015R tool and check for .020R with a comparator if it runs on a manual?
 
Carbide Bob I think you speaking from experience no doubt some customers
Can be dumb and stubborn.
A drawing is a legal document and
The customer has to accept it.
And it would behove to write any issues
On the quote.
 
Some people might just make it with a .02 radius....
Some might assume whatever fits in there has a .05 radius
Some might thank their stars that the part cannot get rejected for not having a zero radius.
 
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