Converting Plus/Minus Tolerancing to Positional Tolerancing and Projected Tolerance Zones

2011 ◽  
pp. 213-225
Keyword(s):  
Tolerance Zones

Formation of Geometric Tolerance Zones for Polyhedral Objects

1997 ◽  
Author(s):  
Utpal Roy ◽  
Bing Li
Keyword(s):  
Variational Model ◽  
Tolerance Zone ◽  
Geometric Tolerance ◽  
Geometric Tolerances ◽  
Polyhedral Objects ◽  
Different Types ◽  
Tolerance Zones ◽  
Algebraic Constraints ◽  
Size Tolerance ◽  
Part Model

Abstract This paper presents a scheme for establishing geometric tolerance zones for polyhedral objects in solid modelers. The proposed scheme is based on a surface-based variational model. Variations are applied to a part model by varying each surface’s model variables. Those model variables are constrained by some algebraic relations derived from the specified geometric tolerances. For size tolerance, two types of tolerance zones are considered in order to reflect two different types of size tolerances. For any other geometric tolerance (form, orientation or positional), the resultant tolerance zone is defined by the combination of size tolerance and that particular geometric tolerance specifications. Appropriate algebraic constraints (on the model variables) are finally used to establish the tolerance zone boundaries in the surface-based variational model.

Tolerance zones: a pragmatic approach to respond to problems related to open alcohol and drug scenes in Bremen/Germany

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Susanna Prepeliczay ◽  
Henning Schmidt-Semisch
Keyword(s):  
Public Space ◽  
Drug Users ◽  
Qualitative Methodology ◽  
Related Disorder ◽  
Content Type ◽  
The Social ◽  
Local Actors ◽  
Tolerance Zones ◽  
Drug And Alcohol ◽  
The City

Purpose This study aims to describe and analyse an approach in the city of Bremen (Germany) to establish streetwork-supported tolerance zones for local open drug and alcohol scenes to reduce related disorder and nuisance in public spaces. Design/methodology/approach The qualitative methodology included systematic participant observations at public sites of drug and alcohol use, and problem-centred interviews with different groups of respondents (residents, passers-by, trades people, drug users, experts from addiction help and police). Findings In residential districts, tolerance zones were well accepted by their target group and found to reduce perceived disorder and nuisance in public space. However, their success depends on the social and spatial conditions of the chosen location, its surrounding urban infrastructure, cooperation among local actors and characteristics of drug using groups. Originality/value Usually, policing of open drug scenes focuses on repression and law enforcement. The example of Bremen suggests that streetwork-supported tolerance zones dedicated to the drug scene can substantially reduce disorder and nuisance in public space.

Description logic-based automatic generation of geometric tolerance zones

2015 ◽  
Vol 79 (5-8) ◽  
pp. 1221-1237 ◽  
Author(s):  
Yuchu Qin ◽  
Wenlong Lu ◽  
Xiaojun Liu ◽  
Meifa Huang ◽  
Liping Zhou ◽  
...  
Keyword(s):  
Description Logic ◽  
Automatic Generation ◽  
Geometric Tolerance ◽  
Tolerance Zones

Mathematical representation of Tolerance Zones

1999 ◽  
pp. 177-186 ◽  
Author(s):  
Max Giordano ◽  
Eric Pairel ◽  
Serge Samper
Keyword(s):  
Mathematical Representation ◽  
Tolerance Zones

scholarly journals Design of a Flapping Wing Mechanism to Coordinate Both Wing Swing and Wing Pitch

2018 ◽  
Vol 10 (2) ◽  
Author(s):  
Peter L. Wang ◽  
J. Michael McCarthy
Keyword(s):  
Design Procedure ◽  
Flapping Wing ◽  
Micro Air Vehicle ◽  
Input And Output ◽  
Air Vehicle ◽  
Swing Movement ◽  
Tolerance Zones ◽  
Four Bar Linkage

This paper presents a design procedure to achieve a flapping wing mechanism for a micro-air vehicle that coordinates both the wing swing and wing pitch with one actuator. The mechanism combines a planar four-bar linkage with a spatial four-bar linkage attached to the input and output links forming a six-bar linkage. The planar four-bar linkage was designed to control the wing swing trajectory profile and the spatial four-bar linkage was designed to coordinate the pitch of the wing to the swing movement. Tolerance zones were specified around the accuracy points, which were then sampled to generate a number of design candidates. The result was 29 designs that achieve the desired coordination of wing swing and pitch, and a prototype was constructed.

scholarly journals A Design System for Eight-Bar Linkages as Constrained 4R Serial Chains

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Kaustubh H. Sonawale ◽  
J. Michael McCarthy
Keyword(s):  
Random Search ◽  
Design System ◽  
End Effector ◽  
Serial Chain ◽  
Straight Line ◽  
Tolerance Zones ◽  
Serial Chains

This paper presents a design system for planar eight-bar linkages that adds three RR constraints to a user-specified 4R serial chain. R denotes a revolute, or hinged, joint. There are 100 ways in which these constraints can be added to yield as many as 3951 different linkages. An analysis routine based on the Dixon determinant evaluates the performance of each linkage candidate and determines the feasible designs that reach the task positions in a single assembly. A random search within the user-specified tolerance zones around the task specifications is iterated in order to increase the number of linkage candidates and feasible designs. The methodology is demonstrated with the design of rectilinear eight-bar linkages that guide an end-effector through five parallel positions along a straight line.

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