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Topic: Geometric tolerance

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	Geometric Tolerances - Lord Mazak's Guide to Machining
		The tolerance is the distance beteen the two lines or planes or, in the case of a cylinder, the diameter of the cylinder.
		For a cylinder the tolerance zone is the space within a cylinder equal in diameter to the tolerance value and perpendicular to the datum plane.
		The tolerance zone is the space within a cylinder equal in diameter to the tolerance value and coaxial with the datum axis.
	lordmazak.tripod.com /geometric.htm (541 words)

	[No title]
		Angularity tolerance of a surface with reference to a datum surface: The tolerance zone is limited by two parallel planes a distance t apart and inclined at the specified angle to the datum surface.
		Parallelism tolerance of a surface with reference to a datum surface: The tolerance zone is limited by two parallel planes a distance t apart and parallel to the datum surface.
		Perpendicularity tolerance of a surface with reference to a datum surface: The tolerance zone is limited by two parallel planes with a distance t apart and perpendicular to the datum surface.
	www.mel.nist.gov /div826/library/doc/feng92.txt (9341 words)

	Including Geometric Feature Variations in Tolerance Analysis of Mechanical Assemblies
		Geometric feature variations are the result of variations in the shape, orientation or location of part features as defined in ANSI Y14.5M-1982 tolerance standard [ANSI 1982].
		Geometric feature controls allow the designers to specify limits on the form or orientation of a feature on a part, which are not available through the use of size tolerances alone.
		Geometric disturbances propagate through the joints along the constrained directions, that is, in the direction of the geometric degrees of freedom (F axes in figure 8).
	adcats.et.byu.edu /WWW/Publication/94-3/paper3-5_96.html (6409 words)

	Geometric Dimensioning and Tolerancing (Site not responding. Last check: )
		The tolerance zone is a rectangular area or volume aligned along the perpendicular line or surface and bounded by two parallel lines or planes.
		The tolerance zone is a rectangular area or volume aligned along the angled line or surface and bounded by two parallel lines or planes.
		The tolerance zone is a volume centered along the specified surface and bounded by parallel surfaces of the same shape as the basic profile.
	webpages.charter.net /shome/GDT.htm (4100 words)

	GD&T Glossary of Symbols and Terms
		Parallelism Control - A geometric tolerance that limits the amount a surface, axis, or centerplane is permitted to vary from being parallel to the datum.
		Perpendicularity Control - A geometric tolerance that limits the amount a surface, axis, or centerplane is permitted to vary from being perpendicular to the datum.
		Unequal Bilateral Tolerance - A tolerance where the allowable variation is from the target value, and the variation is not the same in both directions.
	www.etinews.com /gdt_glossary.html (2858 words)

	[No title]
		A two-dimensional geometric tolerance that controls the form, orientation, and location of multiple cross sections of a cylindrical part as it rotates.
		A three-dimensional geometric tolerance that controls how much the median points of multiple diameters may deviate from the specified datum axis.
		A three-dimensional geometric tolerance that controls the form, orientation, and location of the entire length of a cylindrical part as it rotates.
	www.toolingu.com /class_class_desc.aspx?class_ID=350200 (1063 words)

	[No title]
		Flatness The tolerance is related to the shape_aspect referencing the advanced_face whose underlying geometry is planar that is being toleranced to the datum.
		Parallelism The tolerance is related to the shape_aspect referencing the advanced_face whose underlying geometry is planar that is being toleranced to the datum.
		Perpendicularity The tolerance is related to the shape_aspect referencing the advanced_face whose underlying geometry is planar that is being toleranced to the datum.
	www.cax-if.org /documents/gdt_usage_guide.doc (2517 words)

	GD&T Glossary of Symbols and Terms
		Geometric Dimensioning and Tolerancing (GD&T) - A set of fourteen symbols used in the language of GD&T. It consists of well-defined of symbols, rules, definitions and conventions, used on engineering drawings to accurately describe a part.
		Parallelism Control - A geometric tolerance that limits the amount a surface, axis, or centerplane is permitted to vary from being parallel to the datum.
		Perpendicularity Control - A geometric tolerance that limits the amount a surface, axis, or centerplane is permitted to vary from being perpendicular to the datum.
	etinews.com /gdt_glossary.html (2869 words)

	Tolerances
		Once the Geometric Tolerance dialog box appears, the procedures for creating a geometric tolerance are the same in Part, Assembly, and Drawing modes.
		Once a geometric tolerance is chosen, the Geometric Tolerance dialog box will appear with options to change the geometric tolerance type, datum references, tolerance values, and symbols.
		Also, note that if the Type of geometric tolerance is changed, datum reference information will be removed from the existing geometric tolerance or the settings under Datum Refs will become unavailable, depending on what information is proper for that particular type of geometric tolerance.
	www.ptc.com /carezone/tutorials/files/advdraw_site/Tolerances/Tolerances_D.htm (1156 words)

	#1 Dim. and Surf. Metrology
		Geometric dimensioning and tolerancing can be described in its simplest terms as a means of specifying the "geometry" or "shape" of a piece of hardware on an engineering drawing.
		Geometric dimensioning and tolerancing, also often referred to in colloquial terms as "geometrics," is based upon sound engineering and manufacturing principles.
		Geometric dimensioning and tolerancing has become a universal engineering drawing language and technique which companies, industries, and government are finding essential to their operational well-being.
	www.mech.northwestern.edu /courses/c403/lab1.htm (3074 words)

	TCI - Technical Consultants Inc. 941-383-4283
		The Geometric Tolerancing Stacks Training Program is designed to educate students on how to evaluate, read and interpret geometric tolerances on linear and axial assemblies.
		Tolerance stacks are an important toolused to evaluate the variable features and dimensions of a single part or an assembly of parts.
		Tolerance stacks are used in the calculation of fits and fit-ups, tolerance accumulation/allocation, datum selection and the use of datum and feature modifiers.
	geotol.com /stackanalysis.htm (638 words)

	GD&T Tips - Basic Dimensions
		The tolerance is on the feature whose ideal size, form, orientation and or location is defined with the basic dimensions.
		Metric dimensions and tolerances are not to have trailing zeros (except in non-symmetric bilateral tolerance) for uniformity, Section 2.3.1.
		The tolerance is the geometric tolerance no matter how many zeros follow the basic dimension.
	www.tec-ease.com /tips/march-05.htm (211 words)

	GD&T
		A datum is the origin from which the location or geometric characteristics of features of a part are established.
		The term used to indicate that a geometric tolerance or datum reference applies at any increment of size of the feature within its size tolerance.
		A composite tolerance used to control the relationship of one or more features of a part to a datum axis during a full 360 degree rotation about the datum axis.
	verisurf.com /gd&t.htm (575 words)

	Geometrical Tolerances
		Geometric tolerances specify the maximum variation that is allowed in form or position from true geometry.
		The geometric tolerance is, in essence, the width or diameter of tolerance zone within which a surface or axis of hole or cylinder can lie which results in resulting feature being acceptable for proper function and interchangeability.
		If a tolerance of form is not specified on a drawing for a feature, then the feature as made will be acceptable regardless of form variation.
	www.roymech.co.uk /Useful_Tables/Drawing/draw_geom.html (493 words)

	jul2005
		Tolerance stack-up analysis will require analytical reasoning and a careful consideration of what is physically possible, which is what the end of chapter 6 and all of chapter 7 (as well as all of Chapter 9) is about.
		Once you decide that, if none of the geometric tolerances are factors, you average the MMC and LMC of the features to convert them to equal bilaterally toleranced dimensions to be plugged into the route/circuit being run.
		If a geometric tolerance, such as position or perpendicularity is a factor, you first calculate the inner and outer boundary of the collective effects of the size limits of the feature and the geometric tolerance that applies at that size.
	www.geotolmeadows.com /newsletters/2005/july2005.htm (5369 words)

	Geometric Tolerancing and SPC - Calculating position upper and lower control limits [Elsmar Cove Forum Index (Ar)] - ...
		If the geometric tolerance is constant one can predict capability by applying the appropriate distribution function that best fits the skewed true position deviations and transforming the data.
		If the geometric tolerance is variable you can use a method that compares the (USL plus the Mean variable tolerance "bonus tolerance" minus the Mean geometric deviation) to (three times the square root of the combined variances for size and geometric deviation).
		In the case where the tolerance itself is variable (by permitting bonus geometric tolerance relative to feature size) I personally don't reccomend the method sited by Marty Ambrose with what I know of the shortcomings of various methods predicting the capability of processes with variable tolerances.
	elsmar.com /Forums/archive/index.php/t-4610.html (1484 words)

	TCI - Technical Consultants Inc. • 941-383-4283
		Tolerance stacks are used to evaluate the variable features and dimensions of a single part or an assembly of parts.
		This workbook is designed to educate students on reasonable and proper application of geometric tolerancing to parts and assemblies.
		A popular presentation is to use the Geometric Tolerancing Stacks and Analysis Workbook and the Geometric Tolerancing Applications with Stacks Workbook simultaneously.
	www.geotol.com /details.htm (1331 words)

	Drawing User's Guide: Geometric Tolerances
		Geometric tolerances provide a comprehensive method of specifying where on a part the critical surfaces are, how they relate to one another, and how the part should be inspected to determine if it is acceptable.
		When you add a geometric tolerance (gtol) to a drawing, you can choose the model in which to place the gtol, or create a nonparametric graphical gtol within the drawing itself.
		To add a geometric tolerance (gtol) to a drawing, you may use two, three, or all four pages of the Geometric Tolerance dialog box, depending on the specific characteristics of the gtol you are creating.
	silverstone.fortunecity.com /daytona/344/proehelp/drawings/9_gtols.htm (4719 words)

	AFM Incorporated
		It is impractical to assign standard drawing tolerance designations to these dimensions and, as required, should be reviewed directly with the manufacturer.
		In cases where dimensions are difficult to measure or have unusually close tolerances, the exact method of measurement should be agreed upon in advance by the rubber manufacturer and the customer.
		Three classes of tolerances are specified and must be designated based on the requirements of the application.
	www.afmusa.com /doc_generator.asp?doc_id=4837 (231 words)

	Geometric Tolerances - Milwaukee Precision Casting
		The standard tolerance is ±.005 per inch for axial straightness, roundness (bar or tube shapes) and positioning of holes or bosses.
		The concentricity is dependent on measurements taken from the same plane, and does not include out-of-roundness tolerance.
		The as-cast angle tolerance is a function of the part design.
	www.milwaukeeprec.com /geometric.htm (347 words)

	Producibility Models for the Class of Geometric Tolerance Controls
		The class of position tolerance controls addressed by this research represents the dominant class of specification constraints used worldwide in industrial production work spanning mechanical, electronic (printed circuit boards and related assemblies) and other products.
		A generic 3-dimensional manufacturing error model will be used as input to the formulation of producibility models for the two broad classes of position tolerance control and their variants.
		Manufacturing engineers confronted with the realization of a given position tolerance control scheme will be able to evaluate the minimum accuracy and precision required to meet yield requirements.
	www.personal.psu.edu /tmc7/producibility/producibility.html (478 words)

	Advantages of HubMounted OntheCar Brake Lathes Compared to CaliperMounted Designs
		Compliance with all refinishing OEM (Original Equipment Manufacturer) tolerances and specifications requires the lathe to be processcapable and generate the required geometric accuracy of the refinished braking surfaces.
		One calipermount brake lathe manufacturer suggests concentrating on refinishing the braking surfaces parallel to the brake pads even though the resulting surfaces may not be perpendicular to the spindle or parallel to the rotor hat.
		Note that it is not necessary to align the two rotational axes coaxial to obtain a geometrically correct rotor, but most hubmount brake lathe workholding adapters tend to selfcenter when they are mounted to the rotor hat using the lug nuts or lug bolts.
	www.hunter.com /pub/undercar/3318T/index.htm (4380 words)

	GT (Site not responding. Last check: )
		In the perspective of applying the universal measure in GT, the orientation tolerance should be first completely studied due to its simplicity compared to profile, location and runout tolerance.
		For the application of orientation tolerance, there are lots of different scenarios in terms of the combination of controlled feature and datum feature, which result in different type of tolerance zone.
		Papers regarding the geometric tolerance application will be explored in next month.
	www.eng.uc.edu /icams/resources/gt.htm (401 words)

	Geometric Tolerance - CNCzone.com-The Ultimate Machinist Community
		So if the tolerance is, let's say,.002 at maximum materal condition would be a bull eye of.002 in diameter that the center of the.311 hole can be located.
		This means that the tolerance zone (the area that the centerline of the feature may legally be located) is circular.
		The.0035 tolerance in the X an Y is correct at it's maximum for both axis.
	www.cnczone.com /forums/showthread.php?t=1926 (908 words)

	Title
		The Geometric Tolerance parameter allows the user to establish a dimensional range over which contact between components occurs without exact geometrical contact.
		Previously, the Layer, Geometric Tolerance command would specify the tolerance for the entire model.
		Finer control over contact point creation is now possible as a separate Geometric Tolerance can be specified for each layer in the model.
	www.cablecad.com /Features/Geometric_Tol.htm (59 words)

	GDT Symbols - The Thelen Channel
		Geometric Dimensioning and Tolerancing (GDandT) (sometimes refered to as GDT) Is a set of standard symbols which are used to define parts and assembly features and their tolerance zones in dimensioning engineering drawings.
		Geometric Dimensioning and Tolerancing helps individuals to understand the design intent by allowing better tools for describing the drawings.
		Each circular element of the feature/part must be within the runout tolerance.
	www.thelenchannel.com /1gdt.php (696 words)

	Geometric Dimensioning and Tolerancing
		Geometric Dimensioning and Tolerancing (GDT) was developed as an international language to communicate exactly how a part should be made to achieve the required functionality.
		Geometric Dimensioning and Tolerancing consists of 16 instructional units and requires approximately 32 to 40 hours for presentation.
		Please contact us to learn how you can put the power of Geometric Dimensioning and Tolerancing to work for your company.
	www.iplusnet.com /gdt.htm (285 words)

	GD&T (Geometric Tolerancing) Materials, Services, Classes and Training - Effective Training Inc.
		GDandT (Geometric Tolerancing) Materials, Services, Classes and Training - Effective Training Inc.
		By providing uniformity in drawing specifications and interpretation, geometric tolerancing reduces controversy, guesswork, and assumptions throughout the manufacturing and inspection process.
		GD&T used properly improves communication, results in better product design, and increases product tolerances.
	etinews.com (137 words)

	Geometric Tolerance Dimension at Gdtspcfonts
		Related terms include geometric tolerance, drawing inspection symbol, engineering piping symbols, free piping symbols, and quality inspection symbols.
		Related terms are electrical drafting symbols, steel drafting software, geometric tolerance symbols, mechanical engineering symbols, and charts of geometric symbols.
		The origin is identified with zeroes placed at the closes of those extension lines.
	gdtspcfonts.business555.com /geometric_tolerance_dimension.html (431 words)

	James D. Meadows - Video Training Set Details
		This 38 minute CD-ROM or DVD uses imagery and storytelling to convey the functional reasons behind the growth of geometric tolerance zones as features are produced at varying sizes.
		This 59 minute CD-ROM or DVD focuses on the application of appropriate datum structures and geometric tolerances to a part that is both challenging and realistic.
		Geometric controls are converted to multi-level/two single-segment controls for cost reduction and compatible mating conditions.
	www.geotolmeadows.com /store/SetDetails.htm (1554 words)

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