Speeds And Feeds Calculator for Milling - end mill rpm chart

A customer uses grade 5 titanium to make the case for pacemaker batteries, but machining the material is challenging. Gühring has the solution: The G-Mold 65 HF solid carbide end mill enabled it to extend the tool life 73 times over.

As a final process step, a second deep hole drill is used to finish drilling to the final depth of 430 mm. It is essential to ensure that the point angle of the follow-on tool is always blunter than that of the preliminary tool. If this is not the case, the first contact between the hole and the tool is on the flank of the tool. This causes the drill to vibrate, the flanks can become blunt/break and the tool life decreases rapidly. The choice of the follow-on tool is therefore determined by the primary tool.

Temperature control drill holes need to be produced in a steel (1.2312) form insert. These will later serve as coolant ducts through which a coolant can flow, for example, in order to control the temperature of the mould. This is especially important for reducing cycle times and improving the quality of the moulded parts. In this example, deep hole drilling is carried out on a horizontal machining centre by DMG; programming was performed using Tebis.

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You can skip the finishing and piloting steps by using the new RT 100 FB flat drill from Gühring. Thanks to its straight main cutting edge, drilling and piloting on inclined or curved surfaces is possible up to 45° without any deflection. The RT 100 FB with a Ø of 8 was used for this component. However, for shallow hole entries, we recommend opting for an alternative tool.

Deep hole drilling plays a significant role in the mould and die sector, especially in the production of injection moulding tools. High-quality cutting tools are indispensable for drilling holes with a high degree of precision and a good surface finish. For example, the tools must be equipped with suitable internal cooling in order to effectively remove chips from the deep holes. We have put together a selection of tools – plus cutting parameters – that ensure a successful deep hole drilling process.

One milling strategy has proven to be particularly successful for mould making, where sometimes very hard materials have to be machined in the shortest possible time: GTC milling. This form of trochoidal milling results in particularly long tool lives during machining.

The spiral solid carbide deep hole drill RT 100 T with a Ø of 8 is used to drill the deep hole. It first drills to a depth of 250 mm. This is where the tool demonstrates its strengths: Its special groove geometry ensures optimum chip transport from deep holes. This is supported by coolant ducts with a maximum cross-section, which effectively deliver lubricant to the cutting edge.

In order to later guide the deep hole drill perfectly, a pilot hole is drilled into the workpiece in the second step. The spiral solid carbide drill RT 100 XF with a Ø of 8 is suitable for this. It drills to a depth of 24 mm (3xD). The tool is perfect for piloting in steel: Its four guide chamfers grip extremely early, thus perfecting coaxiality and ensuring a very high hole quality. This is important because the quality of the pilot drilling determines the further deep hole drilling process.

In this case, we suggest the single-fluted gun drill EB 100 M with a Ø of 7.94. It easily drills to the desired depth of 430 mm and produces particularly narrow drilling tolerances. The monolithic tool does not require a solder joint, which makes it very sturdy. The result: Compared to conventional deep hole drills, the EB 100 M facilitates 20 to 30% higher feed rates.

Competitive pressure in mould making is forcing Vogt AG to shorten its lead times by means of hard machining. Tools from Gühring offer innovative solutions for machining hardened steel up to 54 HRC.

If you don’t have a flat drill to hand, you can use a combination of finishing and piloting. A solid carbide milling cutter with a Ø of 7.7 is used here for initial milling or finishing. We recommend our RF 100 Diver solid carbide end mill for this purpose.