Tolerancing
Tolerancing
(OP)
Hello everyone, I'm a newbie here. I can't say I'm a diploma'd engineer, I am more of a hands on kind of guy. Anyway I have been in Aerospace for 15 years now, almost half my life, mostly spent in turbine engine repair. I have recently picked up employment in a High Speed Testing faility. We test everything from VCR bits and pieces to Turbine disks. We have many vendors who machine test arbors and other articles for us, and the issue I'm having is the tolerancing that we are holding them to. In some cases we are holding them to .0002". Now a tolerance like this can be affected by pretty much anything and if we find an item that is .0001" over than we find it non-conforming. My question I quess is this when is to much, just to much.





RE: Tolerancing
TTFN
RE: Tolerancing
RE: Tolerancing
RE: Tolerancing
But you should control which is the error tolerance of your measurement machine; say, if it measure with a precision of .0001" or less. That could make your measure re-enter in the tolerance required
Everything should be made as easy as possible, but not easier
Albert Einstein
RE: Tolerancing
RE: Tolerancing
Best Regards,
Heckler
Sr. Mechanical Engineer
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RE: Tolerancing
Never hurts to have a few references on the subject...
ASME Y14.5M Dimensioning and Tolerancing
ASME Y14.5.1M Mathematical Definition of Dimensioning and Tolerancing Principles
ASME Y14.5.2 Certification of Geometric Dimensioning and Tolerancing Professionals
ASME Y14.43 Dimensioning and Tolerancing Principles for Gages and Fixtures
MIL-HDBK-682 VALID NOTICE 1 TOLERANCING, DIMENSIONING, AND GAGING TECHNIQUES FOR THE DESIGN OF INSPECTION EQUIPMENT
SAE ARP 587B Balancing Machines - Description and Evaluation Horizontal, Two-Plane, Soft-Bearing Type for Gas Turbine Rotors
SAE ARP 588B Balancing Machines - Description and Evaluation Vertical, Single-Plane, Soft-Bearing Type for Gas Turbine Rotors
SAE ARP 1202A Balancing Machines, Dynamic, Ball Type Slave Bearings for Rotor Support
SAE ARP 1382 Balancing Machine Tooling, Design Criteria for
SAE ARP 4048 Balancing Machines - Description and Evaluation Horizontal, Two-Plane, Hard-Bearing Type for Gas Turbine Rotors
SAE ARP 4050 Balancing Machines - Description and Evaluation Vertical, Two-Plane, Hard-Bearing Type for Gas Turbine Rotors
SAE ARP 4162A Balancing Machine Proving Rotors
SAE ARP 4163 Balancing Machines: Tooling Design Criteria
SAE ARP 5323 Balancing Machines - Description and Evaluation Vertical, Single-Plane, Hard-Bearing Type for Gas Turbine Rotors
Regards, Wil Taylor