If you are using a hand drill it is best to use one with variable speed control. This is because different metals drill best at different drilling speeds. You can refer to one of our our metal drilling speed chart. Imperial drill bit speed and feed chart.

E-mobility components typically are machined on small, low-horsepower CNC machine tools that require lightweight cutting tools. Kennametal’s 3D-printed stator bore tool weighs about half that of the conventionally manufactured version while still meeting requirements for accuracy, roundness and surface finish when boring aluminum.

Microprocessor-based controller dedicated to a machine tool that permits the creation or modification of parts. Programmed numerical control activates the machine’s servos and spindle drives and controls the various machining operations. See DNC, direct numerical control; NC, numerical control.

Machinists can realize ease of handling and energy efficiencies when producing components for e-mobility applications with Latrobe, Pennsylvania-based Kennametal Inc.’s 3D-printed, lightweight stator bore tool. It is for machining the stator bore of hybrid and electric engine housings.

“Just to let eveyone know these drill bits are BRILLIANT, it is the first time I have ever worked with metal and was using titanium bits, managed 3 holes with 3 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 immitations”

“In the housing itself, all components of the engine, such as stator, rotor and bearings, are fitted in,” said Ingo Grillenberger, technical program manager of e-mobility for Fürth, Germany-based Kennametal GmbH’s Solutions Engineering Group. “For the final performance and efficiency of the electric engine, it is very important that all these components are aligned perfectly and they are concentric.”

Rotating cutting tool used to enlarge a drilled hole to size. Normally removes only a small amount of stock. The workpiece supports the multiple-edge cutting tool. Also for contouring an existing hole.

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Fluid that reduces temperature buildup at the tool/workpiece interface during machining. Normally takes the form of a liquid such as soluble or chemical mixtures (semisynthetic, synthetic) but can be pressurized air or other gas. Because of water’s ability to absorb great quantities of heat, it is widely used as a coolant and vehicle for various cutting compounds, with the water-to-compound ratio varying with the machining task. See cutting fluid; semisynthetic cutting fluid; soluble-oil cutting fluid; synthetic cutting fluid.

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Because there are many drill bits that drill through metal it is important to choose the best one for the item you are drilling. Metal drill bits vary in cost, durability and ability to drill different metals. The ultimate guide to drill bits will certainly help you decide what drill bit to use.

We have included a few videos of TTP HARD drill bits in action. The important tips which can be seen in all videos are:-

Although Kennametal developed the tool to machine stator bores, alternative applications are conceivable wherever there are big bores and large depths, such as the bores in transmission cases.

“By using metal powder bed 3D printing together with finite element analysis software, we were able to design and build a tool that brought the tilting moment very close to the spindle face, increasing its rigidity while meeting the customer’s weight restrictions,” said Werner Penkert, manager of Kennametal’s Future Solutions.

Enlarging a hole that already has been drilled or cored. Generally, it is an operation of truing the previously drilled hole with a single-point, lathe-type tool. Boring is essentially internal turning, in that usually a single-point cutting tool forms the internal shape. Some tools are available with two cutting edges to balance cutting forces.

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“The main bore that houses the stator of an electric motor measures approximately 250 mm (9.84") in diameter and approximately 400 mm (15.74") in length with a smaller bearing bore at the bottom,” explained Harald Bruetting, manager of program engineering at Kennametal. “When manufactured using conventional means, a reamer for this type of application would weigh more than 25 kg (55 lbs.), far too heavy for the existing machine tool or for an operator working with the tool.”

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Finally you should always wear eye protection when drilling. Also depending on how long you will be working for you may want to wear ear protectors also.

The tool’s reduced weight is significant because the resulting lower tilting moment makes it easier for machinists to maneuver the tool, and the resulting lower moment of inertia reduces not only wear on machine components but energy consumption.

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“These are by far the best metal drill bits I have ever used hands down. I hesitated to purchase these bits for a while because of the price but finally pulled the trigger and I can say I was stupid for not buying them right away. If you are thinking of buying these but are hesitant because of the price do yourself a favour and get them, you will save time and money in the long run.”

Bruetting and Kennametal’s Solutions Engineering Group turned to the company’s in-house additive manufacturing capabilities to print a strong yet lightweight indexable-insert tool equipped with Kennametal technologies, such as fine-adjustable RIQ reaming inserts for precise finishing and the KM4X adapter for enhanced rigidity. The tool also features 3D-printed coolant channels, which help boost productivity and extend tool life.

“Upon testing this products with various drill sizes into hardened angle iron steel. It worked GREAT – keep in mind when drilling metal – DRILL SPEED can be your enemy. Fast will burn the bit out even with cutting lubricant. Slow and Constant will get a clean and nice hole each and every time without blowing a bit for no reason. This is a nice find and addition to my tool bench.”

You should not fear drilling metal, because if you have the correct drill bit and drilling techique you will have no problems.

“Great buy. Have used drills from well known manufacturers, but these are better. Would recommend them and will be using again”

Two versions of the tool were built: one with a carbon fiber tube and the other using a 3D-printed metal tube. The tool with the 3D-printed tube weighs 10.7 kg (23.6 lbs.), and the carbon fiber version weighs 9.5 kg (20.9 lbs.).

Cobalt drill bits are the best drill bits for hard metals including stainless steel. If you are using a hand drill then a 5% (M35) drill bit will be most suitable and it will be less brittle than other drill bits. TTP HARD drill bits are 5% cobalt and are a high quality drill bit.