how to properly dimension a slotted hole define an angle dimension between the slot line and the construction line you drew - Slot dimensioning ISO standard hole Mastering the Art of Dimensioning Slotted Holes: A Comprehensive Guide

How to dimension aslot GD&T Accurate dimensioning of slotted holes is a critical aspect of engineering design and manufacturing, ensuring parts fit together precisely and function as intendedPrinciples of Dimensioning | Engineering Design This guide delves into the best practices for how to properly dimension a slotted hole, drawing upon industry standards and expert insights to provide a clear, actionable approach2025520—The main rules includespecifying the diameter, position, depth, and type of hole or slotusing standard symbols and dimensions. All dimensions  Understanding proper dimension techniques is fundamental for creating clear technical drawings that minimize ambiguity and prevent costly errorsWhat are the rules for dimensioning holes and slots?

Understanding the Fundamentals of Slotted Hole Dimensioning

A slotted hole, also known as a elongated hole, is a feature that combines the characteristics of a hole and a slotOnce the shape of a part is defined with an orthographic drawings, the size information is added also in the form ofdimensions. ○ Dimensioning a drawing also  Its unique shape necessitates specific dimensioning strategies to fully define its geometry, location, and tolerancesPrinciples of Dimensioning | Engineering Design The primary goal is to provide enough information for a manufacturer to create the part accuratelyMy solution for extruded holes has been tochange the current geometry in the sketch to construction linesand draw/dimension the slots around them.

According to ASME Y145, there are typically three "proper" methods for dimensioning a slot2009622—This article will only cover simple slots. The first slot dimensioning method (a)provides the width and the distance between the end radii center points. These methods aim to clearly convey the key parameters of the slot: its width, length, and the radii of its ends2015724—The 25L is the length of theslot. Because it's not a circle, you do need twodimensionsto determine its size. (Don't confuse this with bolt 

#### Key Parameters for Slotted Hole Dimensioning:

1Dimensioning and Tolerancing Width: This refers to the shortest distance across the slotGeometric dimensioning & tolerancing (Part 1)

2How to dimension slotted holes? Length: This defines the overall length of the slot, including the radii at the endsHinges and Hardware 101 - Dimensioning a slotted hole

32010827—There are 3 "proper" methods to dimension a slotin ASME Y14.5. SolidWorks supports all three. The default method that SolidWorks sets is to the center. Radius of Ends: The curved portions at either end of the slotHinges and Hardware 101 - Dimensioning a slotted hole

4How to define a slot in footprint Centerline Location: The position of the slot's centerline relative to datums or other featuresTrue Position – Position Tolerance

Preferred Methods for Dimensioning Slotted Holes

Several approaches can be employed to dimension a slotted hole, each with its advantages202465—I am dimensioning asloton a flat surface to send a part out for CnC milling. I am unsure theproperformat for dimensioning theslot. The choice often depends on the specific application and the clarity desired in the drawingDimensioning and Tolerancing

#### Method 1: Overall Dimensions and Radii

One common technique involves providing the overall width and overall length of the slotted holeHow to Define Hole Wizard Dimensions in a SOLIDWORKS The radii of the end curves are also indicated For instance, a slot might be dimensioned with its total length and its total width2010827—There are 3 "proper" methods to dimension a slotin ASME Y14.5. SolidWorks supports all three. The default method that SolidWorks sets is to the center. The radii are crucial for defining the shape of the semicircular ends2025520—The main rules includespecifying the diameter, position, depth, and type of hole or slotusing standard symbols and dimensions. All dimensions  When dimensioning slotted holes with fully rounded ends, the radii are indicated but not necessarily dimensioned directly if they are implied by the overall length and width at the narrowest pointHow to dimension this? r/cad

#### Method 2: Width and Centerline Distance

Another widely accepted method for dimensioning slots is to specify the width and the distance between the end radii center points This is a very common approach, especially in CAD software like SOLIDWORKS, where it can be the default methodMy solution for extruded holes has been tochange the current geometry in the sketch to construction linesand draw/dimension the slots around them. This method clearly defines the slot's straight-sided length and its width, with the implied radii forming the rounded endsHousing Drawing - Slot Dims - YouTube For example, a dimension might show the width and then a separate dimension for the distance between the centers of the two semicircular ends2010827—There are 3 "proper" methods to dimension a slotin ASME Y14.5. SolidWorks supports all three. The default method that SolidWorks sets is to the center.

#### Method 3: Centerline Dimensions and Width

In some cases, slotted holes can be dimensioned by indicating the location of their centerlines and the overall widthTry referencing your dimensions from the origin. If this is symmetrical about the Y-axis - draw one side, then use mirror. This method is particularly useful when the precise positioning of the slot is paramount202465—I am dimensioning asloton a flat surface to send a part out for CnC milling. I am unsure theproperformat for dimensioning theslot. The hole itself is then defined by its width and the location of its centerlineGeometric dimensioning & tolerancing (Part 1)

Advanced Dimensioning Techniques and Considerations

Beyond the fundamental methods, several advanced considerations enhance the clarity and precision of slotted hole dimensioningDimensioning a slotted hole - PC-DMIS Vision

#### Geometric Dimensioning and Tolerancing (GD&T)

For applications requiring high precision, GD&T principles are invaluable2009622—This article will only cover simple slots. The first slot dimensioning method (a)provides the width and the distance between the end radii center points. When using GD&T for slotted holes, you can specify positional tolerances to control the location of the slot's features more accurately This can be done using true position to define the allowable deviation from the theoretically exact locationDimensioning and Tolerancing GD&T can also be used to control the form, orientation, and flatness of the slotted holeA sizedimensionmight be the overall width of the part or the diameter of a drilledhole. A locationdimensionmight be length from the edge of the object to 

#### CAD Software and Best Practices

Modern CAD software, including SOLIDWORKS, offers tools to simplify slotted hole dimensioningApply mainly in precisely fine tuning for uncontrollabledimensionbeforehand, alignment accuracy, fixation in certain direction meanwhile keeping slipping free  While the software often defaults to specific methods (like dimensioning to centers), users can adjust theseQuickest way to change a round hole to a slotted hole? For instance, in SOLIDWORKS, you can drag dimension grip points to the perimeter of arcs to dimension to the edge rather than the centerPrinciples of Dimensioning | Engineering Design When designing complex assemblies, ensure that slotted holes are dimensioned to be repeatable and easily manufacturedProper Dimensioning of a slot on a flat surface For non-plated slots, a recommended minimum size is often 3x3mm, though this can vary based on applicationHow to Define Hole Wizard Dimensions in a SOLIDWORKS

#### Documenting Dimensions

It's good practice to write the dimension of the slotted hole in the documentation layer of your drawingLooking for a deeper explanation on the pin-slot alignment This ensures the dimensions are clear and separate from other graphical elementsWrite the dimension of the slotted hole in the documentation layerand it's shape, makes it easier to repeat this in the board (and not to forget). The shape and its associated dimensions should be explicitly shown2025103—If you need to specify an angle for the slot(s),define an angle dimension between the slot line and the construction line you drew, instead of 

#### Origin and Referencing

When specifying the location of slotted holes, try referencing your dimensions from the origin or established datums2022625—For non-plated slots, rounded corner-rectangular or square slots are supported. The recommended minimum size is 3x3mm. If a feature is symmetrical about an axis, drawing one half and using a mirror command can simplify the process and reduce potential errors This is particularly helpful for ensuring alignment accuracy2025103—If you need to specify an angle for the slot(s),define an angle dimension between the slot line and the construction line you drew, instead of 

#### Specific Standards and Variations

While ASME Y142025520—The main rules includespecifying the diameter, position, depth, and type of hole or slotusing standard symbols and dimensions. All dimensions 5 is a widely followed standard, other international standards may exist, such as ISO standards for slot dimensioningChange Slot Orientation Using SOLIDWORKS Hole Wizard For specialized applications, like those involving steel structures, organizations like AISC (American Institute of Steel Construction) may have specific guidelines for slotted hole dimensions, such as the common AISC long slotted hole dimensionsHow to dimension a slot in a drawing?

#### Defining Angles

If a slotted hole needs to be oriented at a specific angle, you can define an angle dimension between the slot line and a construction line you drew This clearly specifies the angular relationshipQuickest way to change a round hole to a slotted hole?

Common Pitfalls to Avoid

* Over-dimensioning: Providing redundant or conflicting dimensions can lead to confusion and errors202465—I am dimensioning asloton a flat surface to send a part out for CnC milling. I am unsure theproperformat for dimensioning theslot.

* Ambiguous Dimensions: Ensure all dimensions are clearly readable and their intent is unambiguousHow to dimension this? r/cad

* Ignoring Tolerances: Failing to specify appropriate tolerances can result in parts that do not fit or function correctlyWe will elaborate on the use of slots for overcoming the overconstraint problem through a sample part using geometric dimensioning and tolerancing principles.

* Confusing Slot Types: Differentiate between through-slotted holes, blind slots, and other variations, as their dimensioning may differLooking for a deeper explanation on the pin-slot alignment

By following these guidelines and understanding the various methods available, you can ensure that your slotted holes are properly dimensioned, leading to accurate manufacturing, reliable assembly, and successful product performanceDimensioning of Slots in SOLIDWORKS for ASME Y14.5 Remember, clear and precise dimensions are the foundation of effective engineering communicationWhat are the rules for dimensioning holes and slots?