What is the true profile of a controlled surface?
As soon as you start adding datums you are relating the controlled surface back to your datum structure via basic dimensions. In this instance the true profile as defined by the basic dimensions is where the tolerance zone is centered about. The true profile just means the theoretically perfect part as it exists on the face of the drawing.
Can I use a profile control without a datum?
The answer is that it depends. A profile control without any datums attached to it is a form control. This means that the profile tolerance has to be tighter than the size tolerance due to Rule #1 and serves to refine the surface. Think of a datumless profile control as restricting the smoothness of the face/surface.
How is GPD measured?
GPD can be measured in several different ways. The most common methods include: Nominal GDP – the total value of all goods and services produced at current market prices. This includes all the changes in market prices during the current year due to inflation or deflation. Real GDP – the sum of all goods and services produced at constant prices.
What is the Phantom line method for GD&T?
The phantom line method is still an acceptable practice as an alternative to using the U modifier symbol. It is straightforward to understand, so if you are working with someone less familiar with GD&T, indicating a unilateral tolerance zone this way may be a better option.
How is GD&T profile calculated?
Profile is usually measured using a CMM due to the complexity of some of the surfaces that are called out. The CMM would compare the 3D scan of the profile to the dimensions called out on the drawing to see if it was in spec.
How is profile of a surface calculated?
Placing the compressed tape between the anvils of a micrometric thickness gage and subtracting the contribution of the incompressible substrate, 2 mils, gives a measure of the surface profile.
How is profile tolerance measured?
When measuring the profile tolerance of a plane, you are checking whether a designed part's curved surface is made to the specified design. Unlike the profile tolerance of a line, the measurement of the profile tolerance of a plane involves the entire specified curvature.
Is profile tolerance Plus or minus?
Size of the opening is given by the basic dimensions, but size tolerance is provided by the Profile of a Surface constraint. Form is also controlled by this tolerance, as each point must be within the tolerance zone, which is plus or minus 0.0025” from the basic dimension.
What is profile of a surface in GD&T?
The profile of a surface tolerance is the 3D equivalent of the line profile tolerance. While the profile of a line controls a specific cross-section on the part, the profile of a surface controls every cross-section across the entire length of the surface.
What is profile tolerance in GD&T?
In GD&T, profile tolerance defines a uniform boundary around a surface within which the elements of the surface must lie. Profile is a complex tolerance that simultaneously controls a feature's form, size, orientation, and sometimes location.
What are the 3 types of tolerances?
Three basic tolerances that occur most often on working drawings are: limit dimensions, unilateral, and bilateral tolerances. Three basic tolerances that occur most often on working drawings are: limit dimensions, unilateral, and bilateral tolerances.
How do I report profile tolerance?
0:273:20GD&T Tip - Reporting Profile - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo when you measure a geometric tolerance you should be reporting deviations. On the feature. NotMoreSo when you measure a geometric tolerance you should be reporting deviations. On the feature. Not dimensions.
Does profile tolerance need datum?
Without specified datums, the profile of surface tolerance zones are equaly disposed about the true profile (as given on the drawing). However, the tolerance zones are free to move as a system, left, right up or down relative to the true surface profile.
What is the difference between flatness and profile?
1:187:03GD&T: Profile vs Flatness - YouTubeYouTubeStart of suggested clipEnd of suggested clipMust lie so there's no relation to individual features the definition for profile is that there's aMoreMust lie so there's no relation to individual features the definition for profile is that there's a tolerance zone that extends perpendicular to the basic surface or just the surface of the part.
Is profile tolerance bilateral?
Bilateral profile tolerance means variation from the true profile is permitted in equally in both directions. Unequally disposed profile tolerance means that more variation from the true profile is permitted in one direction than the other.
Does profile tolerance need basic dimension?
Basic dimensions are used to establish the "true profile" which a profile tolerance will then control. So if a profile tolerance is applied to a hole, the diameter MUST be a basic dimension. There are two methods of dimensioning described in Y14. 5: rectangular coordinate dimensioning and geometric tolerancing.
What do you mean by surface profile?
Surface profile measurement is the measurement of a line across the surface that can be represented mathematically as a height function with lateral displacement, z(x). With a stylus or optical scanning instrument, profile measurement is carried out by traversing the stylus across a line on the surface.
What is surface profile in painting?
Surface profile is defined as a measurement of the maximum peak-to-valley depth generated by abrasive blast cleaning and impact-type power tools. These operations effectively increase the surface area and provide an “anchor” for the applied coating system.
What is water surface profile?
The water surface profile within a culvert can be classified two different ways: 1. Hydraulic Slope, which is based on the slope of the culvert bottom and. 2. Hydraulic Curve, which is based on the relationship of the water depth relative to critical depth and normal depth.
Does profile of a surface require a datum?
Profile can control, form, location, orientation, and size or any subset of these. Profile can be used with or without datum references and with or without basic dimensions.
What is the profile of a surface symbol?
The profile of a surface symbol is a half-circle with the curved edge facing up and the flat edge on the bottom. On the feature control frame, the box to the right of the Profile of a Surface symbol contains the tolerance for the surface. The tolerance zone consists of two parallel profiles that follow the True Profile. The tolerance zone can be bilateral or unilateral.
What is the U modifier?
The U modifier symbol to show unilateral tolerance zones was added in the 2009 ASME standard. Prior to this, the 1994 ASME standard used the “Phantom Line” method to show unilateral tolerance zones. Figure 3 shows the part from Figure 2 with Unilateral Tolerances shown using the Phantom Line method.
Is the phantom line method acceptable?
The phantom line method is still an acceptable practice as an alternative to using the U modifier symbol . It is straightforward to understand, so if you are working with someone less familiar with GD&T, indicating a unilateral tolerance zone this way may be a better option.
How is GPD measured?
The most common methods include: Nominal GDP – the total value of all goods and services produced at current market prices. This includes all the changes in market prices during the current year due to inflation or deflation. Real GDP – the sum of all goods and services produced at constant prices.
What is the GDP formula?
There are two primary methods or formulas by which GDP can be determined:
What is actual GDP?
Actual GDP – real-time measurement of all outputs at any interval or any given time. It demonstrates the existing state of business of the economy. Potential GDP – ideal economic condition with 100% employment across all sectors, steady currency, and stable product prices.
What is the total national income?
Total National Income – the sum of all wages, rent, interest, and profits#N#Net Profit Margin Net Profit Margin (also known as "Profit Margin" or "Net Profit Margin Ratio") is a financial ratio used to calculate the percentage of profit a company produces from its total revenue. It measures the amount of net profit a company obtains per dollar of revenue gained.#N#.
What is the gross domestic product?
What is Gross Domestic Product (GDP)? Gross Domestic Product (GDP) is the monetary value, in local currency, of all final economic goods and services produced in a country during a specific period of time. It is the broadest financial measurement of a nation’s total economic activity.
Is the gross domestic product based on inflation?
The prices used in determining the Gross Domestic Product are based on a certain base year or the previous year. This provides a more accurate account of economic growth, as it is already an inflation-adjusted measurement, meaning the effects of inflation are taken out.
Is GDP an accurate measure of the economic state of a country?
In these cases, GDP is not an accurate measure of some components that play a large role in the economic state of a country. Income generated in a country by an overseas company that is transferred back to foreign investors is not taken into account. This overstates a country’s economic output.
What is the largest deviation of a profile control?
If the profile control has all degrees of freedom constrained then the largest deviation x2 is the size of the zone you are using, period. If you have no datums, or only partial constraint, then things get a bit more interesting and the details of the callout are necessary to make any conclusion. The only difference between profile of surface and profile of line is whether you are measuring something that is 3D or are measuring just a 2D slice. If both symbols are referring to the same feature on your drawing they are defining two different zones and the profile of line will (should) always have a smaller tolerance because it is being used as a refinement of the 3D zone, as R2ah1ze1l mentions.
What is profile to what?
as mentioned above (ejolsen)... profile to what??? the 'profile' is the defined nominal shape of feature and the tolerance is determined by the FCF. if your FCF has a constrained profile (form AND location) and tol is .020 then your 'profile' is OOT by .006. (ASME)
What is the callout for a profile callout?
The profile callout is .020 and profile of line is .010.
What is load profile?
The load profile is an approximation of the aggregate energy required from a power system over a particular time period (e.g., years, days, hours). The load profile is demonstrated in a two-dimension graph exhibiting the instantaneous load (in Volt-Amperes) over a certain period of time and presents an easy way to visualize loads changes with time.
What is the first step in load list?
The first step is the transformation of all the collected loads into a load list.
What is the design margin for load growth?
It is normal to take into account future load growth in the calculations which generally ranges between 5 % and 20 % (typically somewhere between 5 and 20%). A design margin is taken into account for any inaccuracies in the load’s estimation. Generally, a design margin ranges between 10% and 15% is suggested.
What Is The Profile of A Surface in GD&T?
Surface Profile Tolerance Zone
Surface Profile Relation to Other GD&T Symbols
Profile of A Surface Feature Control Frame
When to Use Profile of A Surface Tolerance?
Important Points to Remember
- Here are some best practices and important points to consider when using the profile of surface tolerance. 1. As with all GD&T, make sure that basic dimensions are used, when adding numerical dimensions for features controlled with surface profile control. 2. The numerical tolerance range for the surface profile depends on the following factor: 2.1...
Conclusion
Profile of A Surface
Bilateral Tolerance Zone
Unilateral Tolerance Zone
Additional Unilateral Tolerance Zone Examples