Screw Threads Terminology
967K views · Aug 29, 2023 machiningdoctor.com
Simple explnation for: Pitch Diameter, Major Diameter, Minor Diameter, pitch, lead, lead angle, Length of Engagement, crest, root, thread height, over-wire, and allowance.
Inch Vs. Metric Threads - Engineering advantages & disad...
164K views · Nov 23, 2023 machiningdoctor.com
In this video, Erez & Eric from the Machining Doctor website explain the technical differences between Inch and metric threads. Most engineers choose one or the other based on the units they are used to, but this video shows that there is much more to it than that! Join us for an in-depth explanation of the advantages and disadvantages of each system based on engineering requirements. 🕐 Chapters: 00:00 - Introduction 01:11 - Diameter Range 01:51 - Variety of Diameters 02:22 - Pitch / Diameter Combinations 03:45 - Tolerance Classes 04:21 - Summary 🔗 Resources: Metric Threads: https://www.machiningdoctor.com/charts/metric-thread-charts/ Inch Threads: https://www.machiningdoctor.com/charts/unified-inch-threads-charts/
How to use the Machining Doctor
168K views · Aug 8, 2023 machiningdoctor.com
This chapter covers the following topics: 1)The main sections of the website. 2) The information you can find in each area. 3) How the information is interlinked. 4) Site search. 5) Glossary.
NPT threads: Terms, Descriptions & series
90K views · Jan 11, 2024 machiningdoctor.com
We will be talking about NPT Pipe threads - what they are, their terms and definitions, 🔍 their descriptions, and how they differ from standard metric and inch threads. Learn about terms such as Wrenching allowance, hand-tight engagement length, useful threads, and many more. 🔗 Resources: NPT reference guide: https://www.machiningdoctor.com/charts/thread-npt-charts/ NPT Thread Calculator: https://www.machiningdoctor.com/calculators/threading/ 🕒Chapters: 00:00 - Introduction 01:06 - What is an NPT thread? 02:27 - NPT thread: Definitions of terms 04:45 - NPT threads designations 06:26 - NPT lesser-known series (NPCS, NPTR, NPSM, NPSL) 08:08 - Summary
What is a Minor Diameter of a thread?
117K views · Jan 16, 2024 machiningdoctor.com
The minor diameter is the diameter of an imaginary cylinder that touches the smallest diameter of a thread. It depends on the pitch and the thread’s angle. External Thread: The minor diameter is measured on the root of the thread. Internal Thread: The minor diameter is measured on the crest of the thread. Learn More: https://www.machiningdoctor.com/glossary/minor-diameter/
What is a Major Diameter of a Thread?
80K views · Jan 16, 2024 machiningdoctor.com
The major diameter of a thread is the diameter of an imaginary cylinder that touches the largest diameter of a thread. The nominal value of the major diameter equals the nominal thread size. Extremal Threads: The major diameter is measured on the crest of the thread. Internal Threads: The major diameter is measured on the root of the thread. Learn More: https://www.machiningdoctor.com/glossary/major-diameter/
ACME threads: Terms, Descriptions & series
155K views · Jan 27, 2024 machiningdoctor.com
👋 Welcome to another episode in the Machining Doctor's classroom series!🎦We will discuss ACME threads - what they are, their terms and definitions, descriptions, and use cases. 🔗 Resources: ACME reference guide: https://www.machiningdoctor.com/charts/acme/ ACME Thread Calculator: https://www.machiningdoctor.com/calculators/threading/ 🕒Chapters: 00:00 - Introduction 00:44 - What is an ACME thread? 03:57 - ACME thread profile 04:53 - ACME thread series & classes 06:33 - Online ACME thread calculator
What is a Lead of a Thread?
67K views · Mar 1, 2024 machiningdoctor.com
🔹A shot video with a clear explanation of the thread term "Thread Lead". The lead is the linear distance the thread travels due to a full 360° rotation. 🔹 Lead Vs. Pitch: In the typical standard case of one start thread, the lead equals the pitch (L=P). In multi-start threads, the lead equals the pitch times and the number of starts. (L=n*P) 🔹 Lead Angle: The lead angle (φ) measures the inclination of a screw helix from a plane that is perpendicular to the screw’s axis. In more simple words, it is the proportion between the screw’s lead and its diameter. Additional Resources: 🔗 https://www.machiningdoctor.com/glossary/lead/ 🔗 https://www.machiningdoctor.com/glossary/lead-angle/ 🔗 https://www.machiningdoctor.com/calculators/threading/
What is the Length of Engagement of a Thread?
75K views · Mar 1, 2024 machiningdoctor.com
🔹A shot video with a clear explanation of the thread term "Length of Engagement". Length of Engagement (LE) is the axial distance of full (360°) threads in contact between the male and female parts of a threading assembly. It is usually measured in multiples of the pitch. For example, 5P means a length of engagement of five times the pitch. 🔹 Unified Inch Threads per ASME B1.1: The values listed in the charts for UNC/UNF are valid between 5P (five times the pitch) to 1.5D (1.5 times the nominal diameter) engagement length. However, the standard provides formulas that take it into account. If your length of engagement is outside of this range, you should make manual calculations. 🔹 Metric Threads according to ISO 965: The standard divides the length of engagement into 3 groups. Normal, Short, and Long (designates N, S & L). It provides charts and formulas to determine the LE range for each diameter and pitch combination. Following that, it recommends which classes to use for each LE range. However, the designer of a part may choose a class combination outside of this list. Additional Resources: 🔗 https://www.machiningdoctor.com/glossary/length-of-engagement-le/ 🔗 https://www.machiningdoctor.com/calculators/threading/
Root and Crest of a screw thread and how they affect the Thr...
59K views · Apr 3, 2024 machiningdoctor.com
🔹A shot video with a clear explanation of the thread terms Height, Crest, and Root and their relation. 🔹 The crest is a flat (or rounded) surface connecting the flanks at the top of the thread grooves, whether internal or external. 🔹 The root is a flat (or rounded) surface connecting the flanks at the bottom of the thread grooves, whether internal or external. 🔹 The distance between the crest and root is called the thread height. It is designated with hs for external threads and hn for Internal threads. Because in all threads, either the crest or the root must be relieved, the height is a reference dimension and is usually not controlled. Additional Resources: 🔗 https://www.machiningdoctor.com/glossary/crest/ 🔗 https://www.machiningdoctor.com/glossary/root/ 🔗 https://www.machiningdoctor.com/glossary/thread-truncation/ 🔗 https://www.machiningdoctor.com/glossary/thread-height-depth/
BSP threads: Terms, Descriptions & series
62K views · Jul 10, 2024 machiningdoctor.com
👋 Welcome to another episode in the Machining Doctor's classroom series!🎦 We will be talking about BSP Pipe threads - what they are, their terms and definitions, 🔍 their descriptions, the difference between BSPT & BSPP, and how they differ from standard metric and inch threads. 🔗 Resources: BSP reference guide: https://www.machiningdoctor.com/charts/bsp/ BSP Thread Calculator: https://www.machiningdoctor.com/calculators/threading/ 🕒Chapters: 00:00 - Introduction 00:51 - What is a BSP thread? 01:18 - BSP threads designations 02:10 - BSPT (Tapered) series 04:0 - BSPP (Parallel) series 04:47 - Summary
Tap Drill Size Explained: Including 75% thread depth, calcul...
53K views · Nov 6, 2024 machiningdoctor.com
Welcome to the Machining Doctor Classroom series! In this episode, we're diving into the topic of tap drill sizes: what they are, why they matter, and how to calculate them for your machining projects. 🔍 **In this video, you'll learn:** - The definition of tap drill size and its importance. - What the 75% thread depth remark means and why it's the industry standard. - The correct methods to calculate tap drill sizes for both metric and inch units (Including a real example). 💡 Plus, we’ve designed a user-friendly online tap drill size calculator to simplify your calculations! 👨🔧https://www.machiningdoctor.com/calculators/tap-drill-size/ ⏲ Chapters 00:00 - Introduction 00:43 - What is Tap Drill Size 01:20 - What is 75% depth? 02:29 - Tap Drill Size Calculations 03:32 - Tap Drill Size Online Calculator #MachiningDoctor #TapDrillSize #MachiningBasics #Tapping #MachinistEducation #TechnicalTraining