#GD\u0026T (Part 1: Basic Set-up Procedure) | gd&t คือ

#GD\u0026T (Part 1: Basic Set-up Procedure)


นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูความรู้เพิ่มเติมที่นี่

In this video I will discuss the basic rules of setting up a part using geometric dimension and tolerancing and to read a control frame. We discuss the definition of datums, the 321 rules and how a part is set up and inspected or machined. gd\u0026t
Facebook: https://www.facebook.com/infinitymfg/
Twitter: https://twitter.com/?lang=en

#GD\u0026T (Part 1: Basic Set-up Procedure)

สัญลักษณ์ในแบบก่อสร้าง


เรียนรู้สัญลักษณ์ในแบบก่อสร้าง

สัญลักษณ์ในแบบก่อสร้าง

How to Apply GD\u0026T Position Tolerance to a Square Hole Pattern


Quickly shows how to use GD\u0026T to locate a square pattern of clearance holes on a flat plate.
Instagram: @straighttothepointengineering
Discord: https://discord.gg/uvEZyDN
This video was created to help beginners rapidly understand GD\u0026T and quickly use the concepts in practical applications. Technical vocabulary was purposefully NOT used in an attempt to convey these topics to those who do NOT have a background in GD\u0026T.

How to Apply GD\u0026T Position Tolerance to a Square Hole Pattern

เรื่อง GD\u0026T การคำนวนหาค่า Position


เรื่อง GD\u0026T การคำนวนหาค่า Position ที่ผมอยากจะแชร์ความรู้ให้ผู้ที่ทำงานในโรงงาน แผนก QA/QC ได้รู้ไว้แล้วนำไปประยุกต์ใช้ หรือผู้ที่สนใจเรื่อง GD\u0026T ครับ
ขอบคุณทุกคนที่เขามาดูนะครับ
ผิดพลาดประการใด ก็ขออภัยด้วยครับ

เรื่อง GD\u0026T การคำนวนหาค่า Position

GD\u0026T Runout Symbol (Animations and Examples)


Due to a script error for voice over the dial indicator is called a \”gage pin\” in this video. It is clearly a dial indicator. This is corrected in our online content
In circular runout a circular twodimensional TZ is created around a datum axis. The arrow symbol for runout relates to the way it is measured, which should also help you understand how it works.
A part being measured for runout must be held by its datum axis and rotated. The controlled cross section can then have a dial indicator held against it. As the part rotates around its datum axis the dial indicator measures the total variation – or composite deviation – of the surface. If the composite deviation is small enough, then all parts of the surface fall into the prescribed circular TZ, which is a designated location from the axis.
This is different from circularity in that runout also controls in relation to a datum axis. So a surface that is incredibly round, but is off center from the referenced axis will not meet the callout.
Runout is also unique in that is can be used against any surface of the part as it rotates. This part can be held for rotation around it’s axis, and then surfaces that are parallel, angled, and perpendicular to the axis can have runout applied.
In each case the dial indicator would be held perpendicular to the surface feature and a two dimensional TZ would be created. Then as many cross sections as practical would be tested for their own twodimensional TZ.
Note the orientation of the TZ changes with each surface, but the TZ is still a two dimensional circular band. However, due to orientation, and the part’s rotation, the perpendicular use of circular runout controls flatness instead if circularity, in a way.
Also note that for angled surfaces you must callout the basic angle so the dial indicator can be oriented perpendicular to the nominal surface.
Because of the measurement method used for runout, there are three options for parts that can practically be gauged for circular runout. These are ways in which the standards say you can define the required datum axis for circular and total runout controls. If your part does not meet one of these three descriptions you likely want to consider a different control.
The first application of circular runout is on parts with long diameters. A part with a long length vs diameter ratio makes is easy and effective to grab and rotate the part around the axis. The feature needs to be long enough to be able to stop the degrees of freedom physically, functionally, and consistently for effective inspection.
The second part type would be one with a short diameter and a plane. When the length vs diameter ratio is too small to consistently physically stop the desired degrees of freedom from the axis alone, a short axis can be paired with a plane.
For a part such as this, the plane may be your primary datum, and the axis is then held with an expanding chuck to allow functional and consistent rotation around the datum axis.
The third option would be parts with two (or more) short diameters “far” apart from each other. This definition is commonly met by cam shafts or similar rotating parts. The distance between the short diameter sections allow the part to be held and rotated around the datum axis.
Before we move on, let’s look at exactly what combination of other features are controlled by circular runout.
When this part is held and rotated for circular runout this inspection method also controls circularity for each cross section that is inspected.
This also controls flatness of individual rings perpendicular to an axis
As the held feature and considered feature are rotating around the same axis, a part that passes runout also controls the coaxiality of both features.
As all surface points fall within a circular TZ around a central axis, the median point of every diametrically opposed points also falls into a similarly narrow range, meaning that concentricity is also controlled.
Finally, as all cross sections are round and centered on the axis, circular runout automatically controls for Derived Median Line straightness as well.
The combination control of circular runout thus controls circularity, annular ring flatness, coaxiality of features, concentricity, and DML straightness.
You could control each of these separately, but why fill your drawing with several individual callouts that might cause as many individual inspection processes, when you can callout and inspect all of them with a combination control?
This callout is often used in applications where balance and high rpm are needed

See also  สวัสดีวันศุกร์\"หัวใจที่เหมือนเดิม\" | สวัสดีเช้าวันศุกร์ที่สดใส
See also  อนุวัตจัดให้แจ้งด่วน! ได้สิทธิเยียวยาแต่ติดบูโร ทำตามนี้ได้เงิน5000-10000บ.ชัวร์ฟังจากอนุวัตจัดให้ | ใช้หนี้บัตรเครดิต

GD\u0026T Runout Symbol (Animations and Examples)

See also  สปอยหนัง ฉีกคุกอัลคาทราซ l ชายคนนี้คิดแหกคุกที่ไม่มีใครสามารถออกไปได้ | รูปบนเตียง อาร์ตๆ

นอกจากการดูหัวข้อนี้แล้ว คุณยังสามารถเข้าถึงบทวิจารณ์ดีๆ อื่นๆ อีกมากมายได้ที่นี่: ดูบทความเพิ่มเติมในหมวดหมู่Infomation

Leave a Comment