I just don’t get this. How is the endmill with the higher helix angle going to cut “more aggressively”? An endmill with a lower helix angle should lift the chip further with each revolution. Wouldn’t this make for a more aggressive cut, particullarly when plunging or machining a slot? Please explain.

The helix angle of a tool is measured by the angle formed between the centerline of the tool and a straight line tangent along the cutting edge. A higher helix angle used for finishing (45°, for example) wraps around the tool faster and makes for a more aggressive cut. A lower helix angle (35°) wraps slower and would have a stronger cutting edge, optimized for the toughest roughing applications.

Thank you for reaching out. The best way to get an answer would be to send an email to [email protected] or giving our technical support a call at 800-645-5609.

Anyone make a roughing endmill in the, “reached endmill” style? That would have been super useful in cutting a groove in a group of parts I just did.

I really like how well you went into detail with each of the bits of a mill. I would bet that people only know about the flute, and even then, may not know that it’s called that. As you said, having the proper helix angle would be quite important when trying to go through certain materials as with a wrong angle, you might struggle to cut the material.

End mill Corner Radius chart

TTP may sell tough products but I found them anything but tough to deal with, communications were excellent and the drills arrived on time and well packaged. I would deal with them again without hesitation and can highly recommend their products and service. Thanks TTP.

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An end mill features many different dimensions that can be listed in a tool description. It is important to understand how each dimension can impact tool selection, and how even small choices can make all the difference when the tool is in motion.

One consideration that must be made during tool selection is flute count, something we have previously covered in depth. Generally, the lower the flute count, the larger the flute valley – the empty space between cutting edges. This void affects tool strength, but also allows for larger chips with heavier depths of cut, ideal for soft or gummy materials like aluminum. When machining harder materials such as steel, tool strength becomes a larger factor, and higher flute counts are often utilized.

Ball End Mill Size chart

Overall length is easy to decipher, as it is simply the measurement between the two axial ends of the tool. This differs from the length of cut (LOC), which is a measurement of the functional cutting depth in the axial direction and does not include other parts of the tool, such as its shank.

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Just to let everyone know these drill bits are BRILLIANT, it is the first time I have ever worked with metal and was using Bosch titanium bits, managed 3 holes with 3mm drill bits. Then I ordered TTP bits and they were like a hot knife through butter. I was drilling 1cm hard steel and the job was so easy. Highly recommended, don’t buy expensive imitations.

Flutes are the easiest part of the end mill to recognize. These are the deep spiraled grooves in the tool that allow for chip formation and evacuation. Simply put, flutes are the part of the anatomy that allows the end mill to cut on its edge.

End mill Cuttersizesin mm

The overall reach of an end mill, or length below shank (LBS), is a dimension that describes the necked length of reached tools. It is measured from the start of the necked portion to the bottom of the cutting end of the tool.  The neck relief allows space for chip evacuation and prevents the shank from rubbing in deep-pocket milling applications. This is illustrated in the photo below of a tool with a reduced neck.

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Not having done very much research into the Variable pitch of Endmills, I just learned a nice little piece of information for my future Milling tasks! I also appreciate the explanation you have given here, great Info for anyone! Thanks again Harvey Tool!

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Milling cutter size chart

I broke two stainless bolts in the head of my ex-US Army jeep engine which defied left hand bits, quality HSS right hand bits, gas and brute force. They were just an inch long and eventually we got a small pilot hole and a pile of blunt drills. I read that cobalt drills were worth trying, found the TTP site, saw the videos and ordered two of two sizes (in case they got blunt?). A decent-ish corded drill and a single TTP just sliced through both bolts using plenty of oil and low speed as advised in the vid and info leaflet. After a wipe with a rag the drills went in the tool box – though I couldn’t tell which was the used one and which was unused. It sounds corny but I should have got the TTP drills earlier and saved a lot of time and hassle.

This type of tooling features flutes with no flat bottom, rounded off at the end creating a “ball nose” at the tip of the tool.

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Helical Solutions has two different styles of reached end mills for roughing. We currently have a 3 Flute 45 degree chipbreaker rougher for aluminum and a 4 or 5 flute end mill with knuckle roughers for steel both of these end mills are reached.

I had already wasted a mix of various ten HSS, Tungsten and Titanium coated drills without even successfully drilling one hole and was running out of ideas. After trawling the internet I came across the TTP drills and was so impressed with the video I ordered a selection of sizes to try them out. What a difference! A firm pressure and some jiggling with the drill speed soon resulted in the drilling of all the holes with one drill and with the same curl of swarf seen on the video. The other drills produced dust, if I was lucky.

When it comes to a lower helix removing chips faster, we tend to disagree. As a helix becomes shallower, the vertical forces on each chip become less and are therefore unable to lift chips as quickly. As a helix becomes less and less, there is less lifting force on the chips and they are moved vertically at a far slower rate. A higher helix will actually lift chips more than a lower helix.

If you give our tech team a call, we’d be happy to help you with any tooling question you might have. You can reach us at 800-645-5609.

End mill specification

I was very happy with my purchase of the tough drill bits , they allowed me to drill out some broken off tensile bolts from a 25 year old motorbike cylinder head , failure in this would have meant finding a new head or abandoning the project

The cutter diameter is often the first thing machinists look for when choosing a tool for their job. This dimension refers to the diameter of the theoretical circle formed by the cutting edges as the tool rotates.

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Hello there….I just thought I’d drop you a line commending your products. The 6,5,4 and 3 mm drill bits work a treat on my stainless steel cycle rack. Initially I ran the drills too fast and I didn’t use enough pressure which resulted in poor performance, particularly on the larger drill sizes. I quickly learned that slowing the drill down and increasing drill pressure whilst ensuring enough cutting grease had been applied enhanced the drilling performance immensely. It used to frighten me when drilling stainless steel. NOT ANY MORE! Well done your Company!

Standard End Millsizeschart

Reviews from some of our clients who rank TTP HARD drills as the best cobalt drill bits for drilling harder metals including stainless steel.

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We thought you raised a great point about the high helix angle and how it wraps around the tool faster, making for an aggressive cut, and we agree that this could be misleading. We’ll rework this portion to provide more clarity. What we meant was that there are merits to using a high helix tool in an HEM fashion, since a higher helix causes more points of contact between the tool and the workpiece. This helps to provide stability to cut faster, and even provide more stability in thin wall applications. When we say “aggressive,” we’re referring more the nature of a high helix and less its use in HEM, specifically. A higher helix is more aggressive than a lower helix due to higher shear forces on the workpiece, and higher lifting forces, which can get too high in certain workholding situations.

Finally, to provide more clarity on your point that chips must be lifted up through the flutes to be evacuated, this is correct for drills as there is nowhere else for the chips to go. For end mills, especially in low radial engagement situations such as with HEM, chips are ejected radially and are not really getting the chance to move up through the flutes. That small amount of vertical motion will actually be more with a higher helix.

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Hi, can Harvey provide some information on and details about Clearance angle, rake angle, and number of flutes together with some parameter of the geometrical features ?

The shank diameter is the width of the shank – the non-cutting end of the tool that is held by the tool holder. This measurement is important to note when choosing a tool to ensure that the shank is the correct size for the holder being used. Shank diameters require tight tolerances and concentricity in order to fit properly into any holder.

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This type of tooling breaks up a sharp corner with a radius form. This rounding helps distribute cutting forces more evenly across the corner, helping to prevent wear or chipping while prolonging functional tool life. A tool with larger radii can also be referred to as “bull nose.”

A moderate helix angle of 40° would result in a tool able to perform basic roughing, slotting, and finishing operations with good results. Implementing a helix angle that varies slightly between flutes is a technique used to combat chatter in some high-performance tooling. A variable helix creates irregular timing between cuts, and can dampen reverberations that could otherwise lead to chatter.

They are amazing. Didn’t believe the hype, but it appears to be true. I am a locksmith and drill hard plate on safes. They really tore into it.

End mill size chart pdf

They are fabulous. I still haven’t had the time to use them for their actual intended purpose – drilling out exhaust manifold studs, but I did try them out on a couple of bolts to see how they did and was very impressed! Told a bunch of my friends about them. Hoping to get a joint order together. I want more sizes or one of the sets!

The profile refers to the shape of the cutting end of the tool. It is typically one of three options: square, corner radius, and ball.

Standard End Millsizesmetric

Pitch is the degree of radial separation between the cutting edges at a given point along the length of cut, most visible on the end of the end mill. Using a 4-flute tool with an even pitch as an example, each flute would be separated by 90°. Similar to a variable helix, variable pitch tools have non-constant flute spacing, which helps to break up harmonics and reduce chatter. The spacing can be minor but still able to achieve the desired effect. Using a 4-flute tool with variable pitch as an example, the flutes could be spaced at 90.5 degrees, 88.2 degrees, 90.3 degrees, and 91 degrees (totaling 360°).

This is Wayne Winton with Tri County Locksmith Service. I have used the TTP-HARD-drills and personally feel they are some of the highest quality drill bits I have ever used. They work well on a variety of  steels from hardened spring steel to brass and aluminium, all with fast cutting speed and easy drill point starting. They are far superior to the average drill bits that can be purchased at the local hardware store. They have put much time and research into their product and it shows in pure performance. These drill bits are in my service truck and will be for a long time.

Best drill bits I’ve ever used by far, I purchased several different cobalt bits trying to drill into a broken cylinder head bolt to extract it and not one would do more then scratch the hardened head bolt. After hours of trying to drill into the broken bolt I decided to go online and find a different type of bit, after watching many videos about these bits I decided to purchase a full set with their ‘in house lubricant’ as well. Within 10 mins I had the broken bolt drilled and extracted, I’ve never seen a bit cut hardened steel that effortlessly before, I am a life time customer from here on out, worth every penny. Thank you

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We sent our drill bits to renowned locksmith Wayne Winton from Tri-County Locksmiths in Colorado to see what he thought of them. Here are just 2  of the videos he posted on Youtube.