Lead angle, major and minor diameter, pitch diameter, tolerances, and much much more. Gives all the key dimensions for each thread in both a graphical diagram and a columnar report.The threads tab has the following capabilities: Once you’ve got it, tell it what kind of tap you’re using and it’ll calculate the rest based on the thread you have currently selected.īTW, there’s a whole lot more threads-related power in G-Wizard. Just click the “Blind Clearance” button below the Tapping Drill chart to bring it up. So there’s a new Blind Hole Clearance Calculator located on the Threads Tab in G-Wizard: The calculations aren’t hard to do, but given their necessity whenever a blind hole is to be tapped, I thought it’d be convenient to do the calculations for you in G-Wizard Calculator.įiguring out stuff like that so you don’t have to is exactly why G-Wizard exists. That information came to me from the Tapmatic people, who surely do know a lot about tapping. For a 1/4-20 thread roll form tap, it’s 0.214–almost a quarter of an inch! One of the key things I discovered is that the clearance you need to leave is quite a bit more than I would have thought. Here’s the slide from my video that gives all the formulae: I knew it had to stop short of the bottom of the hole, but it turns out there are detailed calculations you can make to determine exactly how much clearance to leave. I never thought real hard about exactly how deep the tap can go for a blind hole. One of those most important is to Mind the Depth on Blind Holes. The subject is 7 ways to avoid breaking taps. I recently did one of my CNC Chef videos for Cutting Tool Engineering Magazine. Just what’s need when Blind Hole Tapping. Those bad boys have a serious helix on them that will pull the chips up and out of the hole. Truth is, Bottoming Taps are really intended for manual tapping applications.įor CNC, I much prefer Spiral Flute Taps: The extra thread on them never gets to the bottom of the hole. In fact, if you take a look at the section below on Maximum Tapping Depth on Blind Holes, you’ll see that Bottoming Taps don’t matter. That’s pretty old technology for CNC’ers. The common answer is you want a Bottoming Tap. We have a complete guide to tap types that will walk you through what’s best for your application. Because of that, you want to use taps designed for blind holes. The hole has a solid bottom they can’t drop out of. Remember that with Blind Hole Tapping, the chips have nowhere to go but up. There are charts available to help with this, but our G-WIzard Calculator has a handy built in reference right on our Threads tab that will figure it out for any thread you use. That torque is the force on your tap that will break it if too much, so that’s why reducing the torque will save taps. It may surprise you to learn that the size recommended on the tap’s packaging or in the typical charts is usually NOT the best size to use!įull details here, but in general, you want to select a hole size that matches a good balance between holding power of the threads and torque required to tap. Let’s get ahead of the game right from the start by choosing the right hole size.
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