ANSI  is a unique beast and has its own standardized sizes that read like this: 10-32. These, like the other two systems, just reflect a particular standardized fastener size. If you need one of these, you likely already know, and if you aren’t sure, there are charts to verify dimensions in detail.

To make sure your parts have the required strength for your applications, you must be sure to take note of factors like tension and shear.

Ideally, you want as much thread engagement/depth of thread as possible. Depending on the application, you may be able to get away with much less. For the best strength, you should try to aim for 1-1.5X the bolt diameter to depth ratio.

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Motion interpolation technology on your smart TV can occasionally result in the dreaded soap opera effect. But what exactly is it?

Besttap material

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Take your sphere and imagine that it's circumscribed about a tetrahedron. Mark the 4 vertices of that tetrahedron on the surface, and then connect each pair of vertices with a line, continuing the lines all the way around the sphere to form four great circles. Those are your cut lines. Before you start cutting, number all the triangles formed on the surface by the intersecting circles and take pictures of both sides of the sphere for later references. Cut the sphere in half along one of those lines; realistically, you're probably going to want to build some sort of jig for holding the sphere securely during each cut. Separate the hemispheres, add the veneer, and put them back together, securing them with some reliable tape around the cut line. Rotate and cut another line, add veneer, and so forth until you finish all four cuts.

SAE is represented by this format: ½-20. This measurement is read as a half-inch diameter with 20 threads per inch of the tapped length.

We hope this guide helps you design your parts for greater success with us, and we ask that you take the time to check out the other guidelines pages to make sure everything looks great. In the end, it will save us all a tremendous amount of time and energy!

Next, you'll need to identify the three parts that make up each section and glue them back together. You should end up with four sections that fit together to make a sphere.

You can solve the first problem by cutting all the way through the sphere rather than trying to only cut partway through. This will leave you with 12 pieces (I think) rather than the four sections you want: each one will have to be glued together from three smaller pieces, but that's really the only practical way to start with a sphere and end up with one.

What is the use oftap

I would like to know the best technique to cut a wooden ball into four identical pieces that meet together in the middle. Obviously, cutting it along two perpendicular planes is a solution, but I want something that resembles this:

2009313 — ... threading, or reverse out and thread by hand. I have a tapmatic ... Anyway, I'm a big fan of power tapping in a mill using a drill chuck.

Use the formula above to make sure there’s sufficient distance between tapped holes and other cut features to ensure optimal performance for your applications.

At SendCutSend we automatically resize holes to perfectly fit the tap you need! That being said you’ll still want to reference our hole size chart when calculating the minimum distance required from other cut features.

Thread engagement is essentially just a fancy way of saying, “what percentage of threads on this bolt are engaged (or joined properly) with the threads on this nut?” It works the same for tapped holes and their appropriate fasteners. What’s important here is knowing your materials.

Threadingtap material

Jan Spurny's solution is a good one, maybe the best way to go if you just want to end up with pieces that can be assembled into a sphere. However, it doesn't solve the problem if you actually want to start with a sphere and end up with a sphere. For that, you need a different approach.

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We’ll need the center of any tapped holes to be at least the following distance from other cut features: tap hole size/2 + the minimum tap hole-to-edge distance for the chosen material.

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If you’re considering whether or not to use a fine thread tap, consider these pros and cons, but understand that this is not an exhaustive list:

The minimum hole-to-edge distance is measured from the edge of the tapped hole to the nearest cut feature, and the specification can be found on each individual material info page by stock thickness.

To solve the second problem, you need to replace the wood that's lost to the saw kerf. If I were going to attempt this project, I'd definitely choose a band saw; of the various common tools, it takes the narrowest kerf by far, and it's well suited to cutting a thick, round object like a sphere. Band saw blades that cut a 0.048" kerf aren't hard to find, and adhesive-backed 0.020" veneer is available. If you can manage to cut your sphere in half cleanly, you can add a layer of veneer to each cut face. Between the veneer and the adhesive, you'll just about make up for the missing wood. (You could skip the veneer if you don't care about the final sphere being exactly a sphere, but I'd worry that errors caused by the kerfs might accumulate.)

Below is a chart of SendCutSend’s available tap sizes. Each tap size is paired with the required through-hole size that will be needed in your design.

Tap materialtypes

Diameter is simply a line of measurement crossing directly through the middle of your geometry, which, in this case, is your hole to be tapped and the fastener to be used.

Tap materialfor metal

Maybe a better solution would be to just double the amount of material and start with a half-ball, that I can then carve to the correct shape? But I can see two issues with that:

I would like to know the best technique to cut a wooden ball into four identical pieces that meet together in the middle.

Tap materialfor stainless steel

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A saw blade removes material in its kerf, so as soon as you cut a sphere the pieces won't go together to form a real sphere.

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Strongesttap material

If you have specific questions regarding your design and they aren’t covered in our guidelines, don’t hesitate to reach out to our support team. Our friendly and talented folks will get back to you as soon as possible!

Thread pitch is a measurement depicting how many threads are in a given space. There are a few different ways to represent thread pitch:

This is done on a tetrahedron, but the idea is the same for the ball: the pieces should meet together in the middle the same way they do on this tetrahedron. Here is an applet I found that allows for 3D manipulation of the tetrahedron, as well as offsetting the four pieces a bit.

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Fasteners/holes with coarse threads have larger pitches compared to fine threads. This just means there are fewer threads per fastener/hole. In contrast, fine threads tend to have smaller pitches and, therefore, more threads. Easy enough, yeah?

Tap materialsizes

In most cases, you’ll likely be using coarse threads, but there are some scenarios in which the use of a fine thread hole/fastener would be preferable.

I would like to know the cleanest way to do it, as later I'd like to carve little cylindrical holes on each piece to add magnets that hold the thing together, and allow for manipulation. Considering I can do the measurements (and that's easier said than done), how do do the actual cutting? How to know where the blade should stop without going too far in the middle?

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Metric is represented by this format: M10-1.5. This measurement is read as a 10mm diameter with 1.5mm between each thread. So, rather than counting threads per inch, the metric system directly measures the distance between two threads in mm.