True Position Question

J

Jack N

If I?ve posted this in the wrong spot please let me know.

I have a couple of co-workers who are misinformed about a true position tolerance zone when the diametrical tolerance zone symbol is not used. They are of the belief that they get the stated amount of tolerance in any direction. IE: If the FCF said .005? tolerance, they believe they get a diametrical tolerance zone that?s .010? across.

I?ve spent hours looking through old books and on-line trying to find something that would show them how it really works. I?ve found all kinds of stuff for the diametrical callouts, but oddly enough I haven?t been able to find a single thing that describes & shows how true position works without the diametrical modifier. Does anybody have something from a standards book (preferably) or a training book that deals with this specifically?

Thanks.
 

Stijloor

Leader
Super Moderator
Re: 1st time poster ? Tru Pos Question

A Quick Bump!

Can someone help?

Thank you very much!!
 
L

Lab_ratt

Re: 1st time poster ? Tru Pos Question

This is covered well in ASME Y 14.5-2009 Sections 7.4.4 thru 7.4.5.2 and figures 7-28 thru 7-34.

Hope this helps
 
Thread starter Similar threads Forum Replies Date
B GD&T Question, True Position Confusion Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
B Minitab Type 1 Gage Study on True Position Question Measurement Uncertainty (MU) 1
M Surface Profile and True Position Question Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
CycleMike Positional callouts on this print - GD&T true position question Inspection, Prints (Drawings), Testing, Sampling and Related Topics 15
C True Position Question - What does this print callout mean? IATF 16949 - Automotive Quality Systems Standard 12
P True position with bonus Excel help Manufacturing and Related Processes 8
R True Position and MMB Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
8 True Position (Bolt Hole Circle) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
D True Position Formula? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 15
M True position, calculating theoretical distances General Measurement Device and Calibration Topics 0
was named killer AS9100 FAIR - True Position hole out by .0011" on 50 parts AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 11
B True Position Measurement Inspection, Prints (Drawings), Testing, Sampling and Related Topics 10
P True Position vs X and Y Dimensions Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
Q How to perform Process Capability for true position Statistical Analysis Tools, Techniques and SPC 11
M True Position / GD&T - I'm staring at this drawing and I'm lost Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
N True Position of slot Boundary with MMC Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
M Measuring the True Position of a Cylinder's Pierce Point Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
M True Position and MMC (Dilemma Between Engineers) AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 3
S Tab to circle True Position? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
S GD&T Callout for Diametrical True Position Manufacturing and Related Processes 6
M Zero Tolerancing on True Position using MMC (Maximum Material Condition) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
D True Position with 1 hole (Datum B) at the Radius Part Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
L GD&T Bonus Tolerance - Checking True Position of a Pierced Hole Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
C Using a Pin Gage to check True Position of Inline Holes, Design, Tolerance. Etc Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
C Checking True Position with Pin Gage Measurement Uncertainty (MU) 3
F How could this Hole Diameter and True Position problem have been Detected & Prevented Nonconformance and Corrective Action 27
J Multiplane True Position Calculations Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
Y Using PC-DMIS to measure True Position of the teeth of a Spline Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
L Calculation of True Position of Slots (GD&T) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
J How to measure the True Position on an Optical Comparator Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
K Using True Position to Control Symmetry Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
K True Position Checking such as Bolt Hole Position w.r.t Center Bore on Wheels Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
M GD&T - True Position Callouts for Sections of Studs Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
J GDT True Position Secondary Callout Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
J True Position with only 1 Datum - Referenced datum is the plane the hole is on Inspection, Prints (Drawings), Testing, Sampling and Related Topics 17
M True Position of a Hole Capabilty - Appropriate parameters to use Capability, Accuracy and Stability - Processes, Machines, etc. 5
K Understanding True position - Drawing Feature Control Frames - ANSI Y14.5 Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
J True Position of slots that have angles as basic dimensions Inspection, Prints (Drawings), Testing, Sampling and Related Topics 8
Q GD&T True Position interpretation - True Position FCF on a B/P Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
B Calibration of Home Made Gages - Simple go/no-go gages to true position gages General Measurement Device and Calibration Topics 8
Q GD&T True Position structure Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
N How to Calculate a True Position on a Square Slot - GD&T Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
H History of True position formula Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
B True Position without tertiary datum? Establishing a proper rotation Inspection, Prints (Drawings), Testing, Sampling and Related Topics 12
E Capability study on true position callout. What would be the upper and lower spec? Statistical Analysis Tools, Techniques and SPC 7
A Bidirectional True Position Tolerance Call-Out for Holes for Process Capability Inspection, Prints (Drawings), Testing, Sampling and Related Topics 7
S Ppk/Cpk for geometrical true position of hole with MMC Capability, Accuracy and Stability - Processes, Machines, etc. 17
G GD&T Help (Y14.5M-1994) - True position callout box on two dowel holes Various Other Specifications, Standards, and related Requirements 16
J GD&T - True Position - "Boundary" under the feature control frame General Measurement Device and Calibration Topics 10
D Procedure for Fixture Gages that check True Position of holes General Measurement Device and Calibration Topics 4

Similar threads

Top Bottom