Break sharp edges
Break sharp edges
(OP)
What do you call this? Break sharp edges? It is a round part.
Okay, if it is break sharp corner and I specify max. .010, is the final dimension be
1. Dia. 8.638" -(2X .010, consider reach to maximum)+/-.005"?
2. OR 8.638"+/-.005" will be the final dimension?
Consider the default tolerance is +/-.005"
using ASME Y14.5-1994.
Okay, if it is break sharp corner and I specify max. .010, is the final dimension be
1. Dia. 8.638" -(2X .010, consider reach to maximum)+/-.005"?
2. OR 8.638"+/-.005" will be the final dimension?
Consider the default tolerance is +/-.005"
using ASME Y14.5-1994.





RE: Break sharp edges
Your standard drawing note should state that sharp edges are to be removed. The machine shop will file your edges down. My standard drawing mote specifies the maximum radius. The minimum is not important to me.
You have a tolerancing issue. You need a profile tolerance on the 45° face. The diameter and angle should be basic dimensions. A tolerance on the Ø8.638 dimension is useless.
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JHG
RE: Break sharp edges
Is it "8.638"+/-.005" ?
If this is what you want, adding the note "break sharp edges" may get you a dim less than 8.633.
If you need this dim, remove the "MAX .010", and "break sharp edges" notes.
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Break sharp edges
To drawoh: if the machine shop file it down per your note in the drawing, what would be the final dimension?
To ctopher: do you mean just leave it as it is, no note at all?
Thanks for the input!
RE: Break sharp edges
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Break sharp edges
RE: Break sharp edges
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Break sharp edges
Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion
RE: Break sharp edges
My two cents.
_________________________________________
Engineer, Precision Manufacturing Job Shop
Tool & Die, Aerospace, Defense, Medical, Agricultural, Firearms
NX8.0, Solidworks 2014, AutoCAD LT, Autocad Plant 3D 2013, Enovia DMUv5
RE: Break sharp edges
Makers of Flat head screws use it just fine
RE: Break sharp edges
The standard way for a machinist to break sharp edges is with a file. This is not an accurate process. Unless you have a requirement for an accurate edge, you should not call up an accurate edge. GD&T profile, angle and run-out FCFs will control your angled face, and allow the machinist to break your sharp edge in thirty seconds, with a file.
If you actually need the accurate diameter, then you need to specify the geometry of the "sharp" edge.
--
JHG
RE: Break sharp edges
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV