Views: 222 Author: Amanda Publish Time: 2025-04-18 Origin: Site
Content Menu
● What is a Diamond Locating Pin?
>> Key Features of Diamond Locating Pins
● Why Use Diamond Locating Pins?
● How Does a Diamond Locating Pin Work?
● Step-by-Step Guide to Designing a Diamond Locating Pin
>> 1. Define the Application Requirements
>> 3. Choose Material and Surface Treatment
>> 5. Determine Mounting Style
● Material Selection for Diamond Locating Pins
● Practical Tips for Designing Diamond Locating Pins
● FAQ
>> 1. What is the main advantage of a diamond locating pin over a round pin?
>> 2. Why are diamond pins often used in pairs with round pins?
>> 3. What materials are commonly used for diamond locating pins?
>> 4. How tight should the tolerances be for diamond locating pins?
>> 5. Can diamond locating pins be used in thick workpieces?
Designing a diamond locating pin is a critical task in precision manufacturing, especially for jigs, fixtures, and assembly operations where accurate positioning and alignment of workpieces are essential. As a professional Chinese enamel badge manufacturer with expertise in precision tooling, understanding the design principles, applications, and best practices of diamond locating pins will enhance your production quality and efficiency.
This comprehensive guide covers everything from the fundamental concepts of diamond locating pins to detailed design considerations, material selection, manufacturing processes, and practical tips. It also includes visual explanations and video insights to help you grasp the concepts clearly.
A diamond locating pin is a precision tool used to position and locate workpieces accurately during manufacturing or assembly. Unlike a standard round pin, a diamond pin has a diamond-shaped head that allows for slight movement or "float" in one axis while precisely controlling positioning in another. This design helps accommodate machining inaccuracies and prevents binding during assembly.
- Diamond-shaped head: Provides clearance on one axis, allowing for slight misalignment.
- Precise control: Locates the workpiece accurately in one direction.
- Reduced binding: Prevents jamming that can occur with two round pins.
- Commonly paired: Often used with a round locating pin to control rotation and position.
Diamond locating pins are widely used in jigs and fixtures because they address common problems such as tolerance stack-up, machining inaccuracies, and workpiece misalignment. Here are the main reasons to use diamond locating pins:
- Compensate for center distance variation: They allow for small variations in the distance between holes on mating parts, reducing rejection rates.
- Prevent redundant location: When paired with a round pin, the diamond pin prevents overconstraint and allows for smooth assembly.
- Allow angular misalignment: The diamond shape permits slight rocking, accommodating perpendicularity errors.
- Simplify manufacturing: Diamond pins eliminate the need for complex slots, reducing machining costs, especially in thicker parts.
The diamond locating pin works by allowing movement along one axis while restricting movement along the perpendicular axis. This is achieved by the diamond shape, which fits snugly in one direction but has clearance in the other.
- The round pin fixes the position in both X and Y directions.
- The diamond pin fixes the position in one axis (usually X) but allows movement in the perpendicular axis (Y), preventing binding.
- This combination ensures the workpiece is located precisely without overconstraint.
- Identify the workpiece dimensions and tolerances.
- Determine the number and location of locating holes.
- Understand the degree of precision needed for positioning.
- Shank diameter: Typically standardized (e.g., 5mm to 30mm).
- Head size: Larger than the shank to provide proper engagement.
- Diamond width and length: Usually designed to fit the hole with slight clearance on one axis.
- Hardened tool steel (e.g., O1, 1045 steel) is common for durability.
- Stainless steel options (SUS304, SUS440C) for corrosion resistance.
- Surface treatments like hard chrome plating or TiCN coatings enhance wear resistance.
- The diamond shape must be precisely ground.
- Include features like flats or chamfers for orientation and ease of assembly.
- Consider adding an air vent or undercut to avoid air compression in blind holes.
- Press-fit shank: For permanent installation with possible removal.
- Threaded or flanged: For adjustable or removable pins.
- Tight concentricity between head and shank (within 0.0005” TIR).
- Hole tolerances typically H7 for mounting.
- Position tolerances to ensure proper fit and function.
- Use CAD software (e.g., SolidWorks) to model the pin and assembly.
- Simulate fit and alignment to check for binding or misalignment.
- Produce prototypes for physical testing.
Material choice impacts the durability and performance of diamond locating pins.
Material Type | Characteristics | Typical Use Cases |
Hardened Tool Steel | High wear resistance, heat treated | General industrial applications |
Stainless Steel | Corrosion resistant, moderate hardness | Environments prone to rust or corrosion |
Coated Steel | Hard chrome, TiCN for surface hardness | High wear and corrosive environments |
- Machining: Precision grinding of the diamond shape and shank.
- Heat Treatment: Hardening to increase wear resistance.
- Surface Finishing: Coatings or plating for corrosion protection.
- Quality Control: Measurement of concentricity, diameter, and surface finish.
- Always pair a diamond pin with a round pin to prevent overconstraint.
- Ensure the diamond pin's orientation is perpendicular to the line between the two pins.
- Use CAD simulation to verify fit and tolerance stack-up.
- Consider the workpiece material and environmental conditions when selecting coatings.
- Design for easy installation and removal if maintenance is required.
Designing a diamond locating pin involves careful consideration of application requirements, precise dimensioning, material selection, and manufacturing processes. The diamond pin's unique shape allows for slight misalignment accommodation, reducing binding and improving assembly accuracy. By pairing it with a round pin, you can achieve reliable and repeatable workpiece location, essential for high-quality manufacturing.
Understanding these principles and applying best practices will help your factory produce superior precision locating pins, enhancing your product quality and customer satisfaction.
A diamond locating pin allows slight movement along one axis, accommodating machining tolerances and preventing binding, whereas a round pin restricts movement in all directions[5][12].
Using one diamond pin and one round pin prevents overconstraint by allowing adjustment in one axis, ensuring smooth assembly and precise location[2][6].
Hardened tool steel and stainless steel are common, with surface treatments like hard chrome or TiCN coatings for wear and corrosion resistance[5][8].
Concentricity between the head and shank should be within 0.0005” TIR, and hole tolerances typically follow H7 standards to ensure proper fit[2][5].
Yes, diamond pins are especially useful in thicker parts where manufacturing slots would be costly or difficult, providing precise location without complex machining[12].
[1] https://www.reddit.com/r/SolidWorks/comments/14vzf40/best_approach_for_creating_a_diamond_locate_pin/
[2] https://www.centurytools.com/product/diamond-locating-pin-140/
[3] https://in.misumi-ec.com/vona2/mech/M0300000000/M0301000000/M0301010000/?CategorySpec=00000004206%3A%3Ab
[4] https://www.youtube.com/watch?v=WXg0n4r060k
[5] https://wp.optics.arizona.edu/optomech/wp-content/uploads/sites/53/2016/08/LOCATING-PINS.pdf
[6] https://www.reddit.com/r/AskEngineers/comments/pawy7t/diamond_pins_how_much_locational_tolerance_do/
[7] https://www.eng-tips.com/threads/locating-with-two-diamond-locators.304891/
[8] https://www.wdscomponents.com/en-gb/location-pin-diamond
[9] https://www.youtube.com/watch?v=SvMj785_oio
[10] https://www.eng-tips.com/threads/can-anyone-explain-how-diamond-locating-pins-work-like-a-pin-and-slot.489173/
[11] https://www.stat.cmu.edu/technometrics/59-69/VOL-09-01/v0901131.pdf
[12] https://www.faro.com/en/Resource-Library/Article/gd-t-in-precision-engineering-diamond-pins-for-precision-location
[13] https://www.kosmek.co.jp/data/pdf/en/VRA_R00_FA2017_GB.pdf
[14] https://www.youtube.com/watch?v=C_vqMerH-oQ
[15] https://testbook.com/question-answer/a-diamond-locating-pin-is-used-in-jigs-and-fixture--63b599e3db3670bcb481d5c6
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[18] https://www.carrlane.com/engineering-resources/technical-information/manual-workholding/locating-devices/locating-pins
[19] https://www.youtube.com/watch?v=WXg0n4r060k
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[31] https://www.carrlane.com/product/locating-pins/locating-pins/round-diamond-locating-pins-press-fit-type/diamond-locating-pins-press-fit-type/cl-4990-dpt
[32] https://www.youtube.com/watch?v=aun2HI0vBms
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