Yamawa Manufacturing Co.,Ltd. List of Products and Services

This document covers "Setting the Tap Oversize Amount to Match the Plating Cost for Internal Threads." It introduces the relationship between the plating thickness and effective diameter when plating internal threads, as well as the general setting procedure for plating taps and a precision setting consideration diagram for M6×1 plating taps. [Contents] ■ Relationship between plating thickness and effective diameter when plating internal threads ■ General setting procedure for plating taps ■ Precision setting consideration diagram for M6×1 plating taps (Plating thickness: 8–16μm) *For more details, please refer to the PDF document or feel free to contact us.

This document discusses "the causes and mechanisms of runout enlargement." It introduces issues such as runout, misalignment, and the inclination/bending of pilot holes, as well as cutting with taps that are unsuitable for the workpiece and cutting under conditions where the tap's cutting ability has deteriorated. 【Contents】 ■1. Runout, misalignment, and inclination/bending of pilot hole cutting ■2. Cutting with unsuitable taps for the workpiece and cutting under conditions where the tap's cutting ability has deteriorated *For more details, please refer to the PDF document or feel free to contact us.

This document contains measures regarding the "stop gauge failure (enlarged internal thread) trouble." In tapping operations using holders with tension/compression on a machining center, "stop gauge failure (enlarged internal thread) trouble" may occur, but visual inspection does not reveal any chipping or welding on the tap. The cause of the trouble is believed to be due to the tap's feed being either too fast or too slow. This phenomenon is explained with diagrams and countermeasures are provided. [Contents] ■ Consultation and answers regarding stop gauge failure (enlarged internal thread) trouble ■ Explanation and countermeasures for the phenomenon of the tap's feed being too fast or too slow *For more details, please refer to the PDF document at the link below.

This technical document provides information about Unified screws used for aircraft, specifically "UNJ screws." It details the features of UNJ screws, standard thread profiles, and screw pilot hole diameters, offering a comprehensive overview of the product. [Contents] - Features of UNJ screws - Standard thread profiles of UNJ screws - Screw pilot hole diameters *For more details, please refer to the PDF document or feel free to contact us.

This technical document introduces "the grades of internal threads and the grades of taps." It includes information on the effective diameter tolerance range of P-grade taps based on nominal diameter and pitch, as well as a comparison table of the effective diameter tolerance ranges for taps intended for the American market, P-grade Yamawa, and Unified internal thread grades. 【Contents (excerpt)】 ■ Yamawa P-grade precision ■ Effective diameter tolerance range of P-grade taps based on nominal diameter and pitch ■ JIS precision ■ Comparison table of effective diameter tolerance ranges for tap grades and internal thread grades ■ Standard grades and oversized, etc. *For more details, please refer to the PDF document or feel free to contact us.

This document is a technical material published by Miman Manufacturing Co., Ltd. Since our establishment, we have continuously adopted and researched suitable high-quality materials. It explains the current standard materials in use, as well as trends in tool materials. [Contents] ■ Materials Used ■ Trends in Tool Materials ■ JIS Chemical Components *For more details, please refer to the PDF document or feel free to contact us.

This document is a technical material published by Miman Manufacturing Co., Ltd. It explains the feeding mechanism and features of the machine, as well as the tendencies of the tap's self-guiding properties. [Contents] ■ Feeding mechanism and features of the machine ■ Features of the holder ■ Tendencies of the tap's self-guiding properties *For more details, please refer to the PDF document or feel free to contact us.

The "screw thread" consists of five main elements: outer diameter, effective diameter, root diameter, thread angle, and pitch. In this technical document, we provide detailed information on the "five main elements of screw threads," as well as "important effective diameters," "overall effective diameters," and "pitch errors." [Contents] ■ Five main elements of screw threads ■ Important effective diameters ■ Overall effective diameters ■ Pitch errors ■ Half-angle errors of the thread crest *For more details, please refer to the PDF document or feel free to contact us.

Normal female threads will stop within two rotations of the stop screw gauge. However, issues such as misalignment of the spindle, spindle runout, and the use of worn taps can lead to problems like "enlargement due to excessive cutting at the mouth," "enlargement due to insufficient cutting edge resulting in thread skipping," and "enlargement due to poor feed balance (excessive or insufficient cutting)." This technical document provides detailed information on the causes of "female thread" enlargement and examples of countermeasures. [Contents] ■ Trouble items ■ Main suspected causes ■ Checkpoints and improvement suggestions *For more details, please refer to the PDF document or feel free to contact us.

The engagement rate of male and female threads refers to the percentage of the actual engagement height compared to the standard engagement height. "Actual engagement height / Standard engagement height × 100%" The "fit strength" of male and female threads is also influenced by the relationship (engagement rate) between the outer diameter of the male thread and the inner diameter of the female thread. This technical document covers the "engagement rate." It also provides detailed information about the standard engagement height and more. [Contents] ■ What is the engagement rate of male and female threads ■ Standard engagement height ■ Supplementary explanation *For more details, please refer to the PDF document or feel free to contact us.

The engagement rate of the female thread refers to the percentage of the actual engagement height compared to the reference engagement height. "Actual engagement height / Reference engagement height × 100%" This technical document includes information on the "engagement rate" and also introduces a simple calculation formula. 【Contents】 ■ What is the engagement rate of the female thread ■ Calculation formula for the engagement rate based on the screw hole diameter and female thread ■ Reference engagement height ■ Hole diameter table (main 7 dimensions) *For more details, please refer to the PDF document or feel free to contact us.

The technical document covers "Metric Threads and Thread Gauges." It provides a detailed explanation of external threads and their limit gauges, as well as internal threads and their limit gauges, using diagrams. [Contents] ■ External Threads and Limit Gauges for External Threads ■ Internal Threads and Limit Gauges for Internal Threads *For more details, please refer to the PDF document or feel free to contact us.

I will introduce the relationship between "screw grade and fit length." The grade of a screw is determined by the relationship between the "fit classification" and the "fit length." Since the screw grade indicates the position of the tolerance, selecting the appropriate grade and effectively utilizing the tolerance leads to stable processing. 【Examples of Fit Classification Application】 ■ Precision - Especially for precision screws with minimal play ■ Medium - General-purpose screws used in machinery, instruments, structures, etc. ■ Coarse - Screws used in environments prone to dirt and scratches, such as in construction work and installation, or screws that are difficult to process, like those threaded onto hot-rolled bars or those threaded into long blind holes. *For more details, please refer to the PDF document or feel free to contact us.

Screws have a "fastening function" that tightens and a "feeding function" that delivers accurately, both of which are effective when the flank surfaces of the external and internal threads are in surface contact. This document explains the three factors that determine whether the flank surfaces are in surface contact: "effective diameter, thread angle error, and pitch error." Additionally, it includes measuring tools for determining the quality of screws, such as "thread gauges." Our company continues to propose product developments based on the materials being machined and appropriate usage methods for taps, dies, and center hole drills to establish safe screws. [Contents] ■ About effective diameter, thread angle error, and pitch error ■ About thread gauges ■ Comparison of ideal acceptable internal threads and unsafe acceptable internal threads *For more details, please refer to the PDF document or feel free to contact us.

We would like to introduce the screw simple measurement tool 'SID/SITD'. The "SIT" is a screw inspection tool designed for through and blind screws, which employs a step screw at the tip of the screw section to reduce the burden of inspection work and improve efficiency. The "SITD" features a shape that integrates the "through screw section" and the "blind screw section," allowing for accurate inspection while removing small foreign objects from the internal threads by incorporating a groove for the inspection tool. The shank section has the same shape as a tap, allowing it to be attached to a tap holder, and by mounting it on a measuring machine, "mechanical measurement" becomes possible. 【Features of SIT/SITD】 ■ Adoption of a step screw at the tip of the SIT screw section improves efficiency by reducing the burden of inspection work. ■ Use of high-quality material (HSS) significantly enhances lifespan. ■ "Through" and "blind" can be purchased individually. ■ Adoption of color markings facilitates storage management. ■ The shank section has the same shape as a tap, allowing it to be mounted on a tap holder. *For more details, please refer to the PDF document or feel free to contact us.

We would like to introduce the "Helical Cutter" handled by Miman Manufacturing Co., Ltd. We have adopted ultra-fine particle carbide materials with wear resistance in mind, along with special coatings to achieve stable processing, including "MC-CSLC" and "PRML," as well as "MC-HLC," which is made of high-speed steel with excellent toughness. Please make use of them according to your applications. 【Product Lineup】 ■PRML ■PRML TI ■MC-CSLC ■MC-HLC *For more details, please refer to the PDF materials or feel free to contact us.