![]() ![]() It features convenient transportation, vertical integration of services from raw materials, fine machining to surface treatment and so on, and horizontal integration of services, providing casting, forging, rolling, extruding, cutting, high energy beam machining, chemical etching, etc. ![]() The Industry of CNC machining service is quite dense in Taiwan. The strength of CNC machining service in Taiwan Therefore, with low labor rates and production lines, economics in Taiwan began to prosper, led by the manufacturing industry that processed and exported. The industrial globalization after WWII enabled multinational corporations to look for lower-cost manufacturing bases worldwide. The origin of CNC machining service in Taiwanġ950-1980 is a period called “Taiwan Economic Miracle”, when Taiwan benefited from the late-development advantage of industrialization. From the Q&A below, let’s take a look at how Taiwan as a west Pacific island country reaches such outstanding achievements in the CNC machining industry, which blooms and stands out from the intense competitions of globalization. This passion has led us to promote our line of Titanium Nitride (TiN) coated gages that provide you with a significant improvement to your quality system.Since the late nineteenth and early twentieth century, globalization has gradually led to international trade, capital and investment flows, migration, and the knowledge dissemination. Our passion for Internal Threads covers both the creation of the threads and their measurement. Jarvis provided us a H1.5 Jarflo and now every tap works out of the box.” “We have a medical part with using an 80-pitch tap and we were always chasing the size.“We were looking to improve tap life, by using the Jarvis H7.5 taps we were able to achieve 8% more holes per tap.”.When we went to the Jarvis H4.5 it solved all of our gauging problems.” ![]() “In our application sometimes the H5 went oversize while sometimes the H4 was tight.Using the below graphic, you can see how the half H-Limit lines up: Half-H-Limit taps still have the 0.0005” tolerance but how span two of the traditional H-Limit tolerances. This is why Jarvis regularly provides half H-Limits to both address gage issues and to provide cost savings. Industry rule of thumb is that the largest “H” limit possible will achieve proper class of fit and maximum tool life – so the gain of a half-H-limit can result in improved tool life that over the course of a high/repeat production job can produce considerable cost savings. If the threads are gauging too tight, the H limit number is increased. These are just recommendations so if the threads in the part are gauging too loose, use a smaller H-Limit. The difference in size from one H limit to the next is 0.0005″ increments for taps through 1″ diameter. They are, essentially, the same thing.Īs the following table shows, each H-Limit has a 0.0005” tolerance H-Limits are used for Imperial (or Inch) thread designations and D-Limits are used for Metric threads. H-Limits are used to make small adjustments to the pitch diameter. It should be noted that you need different H-Limits for cutting versus forming threads. Forming threads require a larger H-Limit because they form the threads exactly to the size of the tap, while cutting taps cut a thread that is larger than the tap. For example, on a ¼-20 2B fit, the recommended H-Limit is H5 and on a ¼-20 3B fit, the recommended H-Limit is H3. Each combination of tap size and pitch has a recommended H-Limit for each Class of Fit. For Inch threads, the most common classes of fit are 2B and 3B. This is the critical element to ensure the part gauges correctly and choosing the number ensures that the threads will gage within the required tolerance. Working outside of the “Traditional” H-Limits may be the answer to both of those questions. Do you want maximum savings by optimizing tap life?.Are you having intermittent gauging issues?.Half H-Limits Help Optimize Quality and Lower Costs ![]()
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