These “type 3” chips are often caused by coming in too low with your cutter’s rake angle. You’re basically plowing instead of shearing the wood. Here are some options to fix the problem.

In climb cutting, you feed the wood in the same direction as the bit is rotating. The cutting tool eases into the wood, creating chips that start thin and then get thicker as the bit goes farther. This approach reduces the cutting forces and risk of tear-out.

Powdered Metal: Powdered metal thread taps are made by compressing and sintering metal powder. They are more wear-resistant than HSS taps and can be used on a wide range of materials. However, they are also more expensive than HSS taps and require specialized equipment for sharpening.

The causes are complex. But in essence, instead of cleanly cutting through the wood fibers, you only tear at them or push them down into the wood. Later, moisture can revive these fibers and draw them back out.

The denser hardwoods cut more cleanly and are less likely to hide broken fibers that will later spring up on the surface of your product. By the way, all plywood is at risk of raised grain, but you can reduce that risk using plywood made from a hardwood such as birch.

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Instead, try ramping your tool in at an angle and reducing speed when entering the cut. This approach isn’t as hard on the wood or your tool.

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American Rotary phase converters are ideal for providing reliable, balanced power for CNC woodworking. With the proper sizing, you can get one that will run all the equipment in your shop (single-phase and three-phase) simultaneously.

Fuzzy grain is a disappointing blemish on the exposed cut of the wood. Tiny fiber bits jut out when you don’t get a clean cut.

Cobalt: Cobalt thread taps are an alloy of HSS and cobalt. They are more resistant to heat and wear than HSS taps, making them suitable for use on harder materials. However, they are also more expensive than HSS taps.

If this doesn’t work, it may not be a bad idea to invest in a laser tachometer to see if your actual spindle speed is what the machine says it is, and adjust accordingly

Have you seen an old picnic table with sections of fibers (not technically grain) sticking up from the wood surface? That’s what’s known as raised grain.

Thread tapping tool

This advice is closely related to the last tip. Owing to the narrower cut of the finish pass, you might need to do three or four passes to complete the cut and make it nice and clean.

When it comes to threading holes in metal or other materials, thread taps are an essential tool. But with so many different types of thread taps available, it can be overwhelming to choose the right one for your project. In this section, we'll cover the basics of the most common types of thread taps.

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You can get a lot done quickly while working with wood in a CNC router. But that’s not to say it’s always easy. CNC machines are fast, but you’ll often encounter the same issues you would if you were using a manual machine.

Choosing the right thread tap material depends on the type of material you are working with and the complexity of your project. Consider your budget, the required accuracy, and the amount of use the thread tap will endure. By choosing the right material, you can ensure that your thread taps will last longer and provide better results.

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All those wood chips have to go somewhere. Sometimes, they go right into the workpiece surface and leave minor chip marks. Higher moisture content can make these marks look worse.

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Titanium Nitride (TiN) Coated: TiN-coated thread taps are coated with a thin layer of titanium nitride. This coating increases the tool's hardness and wear resistance, making it ideal for use on hard materials like stainless steel. However, they are also more expensive than uncoated taps.

Different types of wood have a wide range of variability and unique characteristics that present many issues that can lead to frustration during the machining process. But with the right know-how and techniques, it can produce great results. So, let’s look at the five most common CNC wood milling problems and ways to solve them.

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A straightforward way to minimize excess friction is to start with the denser end grain. Then proceed to your long grain.

The obvious alternative is to use straight bits. They might still put a bit, but less so. And while you’re at it, opt for longer-lasting tungsten carbide bits instead of high-speed steel for maximum performance.

Cutting wood creates a lot of friction and, by extension, heat. Anytime you have to keep it in one spot, you run the risk of burn marks. Use good, sharp bits, for starters. Here are some other things you can do to prevent this issue.

Score the surface at the edge of your cut with a knife (you can even do this with a CNC tool). At that point, you should have a clean cut free of splinters.

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Case in point with a CNC router: start with a rough pass to remove most of the material first. Then, smooth things out with a much lighter finishing pass (in terms of cut width). The more delicate finishing cut should help clean out splintering without adding any new fuzzy grain.

High-Speed Steel (HSS): This is the most commonly used material for thread taps. HSS taps are affordable, durable, and can be used on a wide range of materials. However, they can become dull quickly when used on hard materials like stainless steel.

But many woodworking operations, especially home shops, lack three-phase power. So how can yours accommodate 3-phase CNC?

Understanding the differences between these thread taps is essential for choosing the right one for your project. In the next section, we'll cover how to choose the right thread tap for your specific application.

You may need to play around with your feed rate to find the sweet spot. Or consider using an online calculator to determine the optimal rate.

Using thread taps can be a bit challenging, especially if you're not familiar with the process. However, with the right techniques and tips, you can create high-quality threads quickly and easily. Here are some tips to help you use thread taps effectively:

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Just kidding (maybe?) … but still, tear out—when the wood grain starts to splinter or fracture—is undesirable. The type and quality of the wood is often a key factor. Here are some adjustments to your CNC approach that can take care of it.

That’s where a backer board comes in. Clamp a backer against your end grain, for example. That should let you cut with the grain without splintering. Or use your spoil board as a backer for the bottom of a cut.

Drier hardwoods may also be more susceptible to burn marks. So when working with this variety of wood you may need to treat these types of wood differently than softer woods.

3 types of thread taps

High-speed steel (HSS) drill bits are used for drilling wood, light metals, fiberglass and PVC.

The choice of material for a thread tap can significantly impact its performance and longevity. Here are some of the pros and cons of different thread tap materials to help you make an informed decision.

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Female ThreadTap

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Most of the time, when you see burn marks on your wood, it’s just because your spindle speed is too high. The faster the spindle speed, the more friction the cutting edge is creating. You may need to reduce your spindle speed a little bit or use a calculator to determine the correct speeds and feeds for the cut you’re trying to make.

Carbide: Carbide thread taps are made from a combination of tungsten and carbon. They are extremely hard and can cut through even the toughest materials with ease. However, they are also the most expensive type of thread tap and require specialized equipment for sharpening.

Softer woods—pine, balsam, etc.—are much more prone to raised grain problems. (Truth be told, the same goes for splintering and other CNC routing challenges.)

In addition to your feeds and speeds, look at the depth and width of your passes. You may need to take off no more than ⅛ inch of material at a time.

In this case, try doing multiple plunge cuts along your cutting path (instead of just continuous cutting). That way, the chips don’t have as far to go and are less likely to mess up your surface.

Many unsatisfactory router results are simply due to a feed rate that’s too high—or, in this case, most likely too low. In this case, the bit grinds slowly at the surface.

By using these tips, you can improve the quality of your threaded holes and extend the lifespan of your taps. It's important to remember that practice makes perfect, and with time, you'll become more comfortable and proficient at using thread taps.

Choosing the right thread tap for your project is crucial to achieving the desired results. Here are some factors to consider when selecting a thread tap:

In conventional cutting, you feed the workpiece against the router bit’s direction of rotation. The cutter collides with the wood, sometimes causing splintering.

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For great CNC results all around, consider how you power your equipment. Generally speaking, three-phase electricity enables smoother CNC operation.