When it comes to precision micro-drilling, Germany-based
Walter has introduced two new additions to its high-quality Supreme range of micro drills. The new internally cooled range of Walter Titex DB133 Supreme micro drills, which feature an A1CrN coating, has been expanded with 5, 8 and 12xD versions.
The 5xD option has WJ30EL full flute length coating applied. However, the longer 8xD and 12xD drills are WJ30ER with the coating only applied to the point of the drill and not the entire flute length, which further aids chip evacuation in deeper holes.
The Walter Titex DB133 drills feature a 140deg point angle to ensure positive engagement in the pilot hole that it produces. The series starts at 0.7mm diameter, and increases in 0.05mm increments to the largest drill in the range, 1.984mm. The overall flute length of the 0.7mm diameter 5xD, 8xD and 12xD drills is 6, 8 and 11mm and 17, 23 and 31mm respectively for the largest 1.984mm diameter 5xD, 8xD and 12xD drills.
The entire programme is based upon a 3mm diameter shank with all drills consisting of precision ground flutes and two coolant channels that maximise chip clearance and cooling performance.
The new DB131 Supreme drill is a pilot drill for deep hole drilling operations. It features the WJ30EL (AlCrN) coating which covers the complete flute length and it has a smooth surface offering secure chip evacuation. The point angle on the DB131 pilot drill is 150deg making it perfect for pilot holes up to 2xD prior to the deep hole drilling applications with the corresponding DB133 drill.
The diameter ranges from 0.5 to 1.984mm with 0.05mm diameter increment increases, with common imperial equivalents also added to the programme, and covering some small tap drill sizes. The flute length of the 0.5mm drill is 3mm and the overall length is 47mm and this proportionately increases to a flute length of 10mm and overall length of 57mm on the 1.984mm diameter drill.
The result of a new flute design allows the chips to break, so that they are shorter, guaranteeing reliable evacuation from the work envelope.
The new drills also incorporate a special cutting edge preparation that demonstrates outstanding surface finish and overall hole quality on the component whilst significantly improving tool life.
With these new products, Walter has further refined the adaptation of the length to diameter (L/D) ratio to the required drilling depth. The result is a range of micro drills that ensures maximum stability when machining thanks to its broad scope and the optimised design. The drill and pilot drill can be used with emulsion or oil and are suitable for all ISO material groups.
In addition to the watchmaking and jewellery industry and medical technology, the premium manufacturer cites general mechanical engineering, mould and die making, the electronics and the energy and automotive industries as other specific areas of application.