So you want to make a very deep hole in hardwood and have previously had dubious experiences with lesser drill bits. With increasing depth, the spirals of conventional wood bits are liable to clog, causing friction and localised heat generation. I you try to continue drilling, the bit starts sending smoke signals, the machine starts groaning, and soon afterwards both the drill and the workpiece are ruined.
What is the reason for these problems?
Conventional wood drills usually have two milled spirals for chip removal, if you look at the cross section of these spirals end on, they look like a U-form. After picking up the chip on the main cutting edge, the chip expands. In a closed U-shaped spiral, especially one with a crudely machined surface, the chip can easily become hung up instead of being efficiently transported out of the hole. Friction causes heat, heat causes expansion and dulls the cutting edges, expansion causes more friction and so the cycle continues.
So what is different about the FAMAG Wood Drill series 1599?
First, we use the best material for this application: Fine grained HSS, which retains its hardness and wear resistance even if used for long periods.
We don't mill the spirals as usual, but instead grind them directly into the pre-hardened HSS blank. This creates a very smooth internal surface on the spiral flute, through which the chips can flow easily. The big secret is the special FAMAG spiral cross-section. Rather than a U-section, we use grinding wheels that form an open flank, increasing the amount of space inside the hole for the chips to expand into. The result is a deep hole spiral that works like an auger.
The other major advantage of grinding after heat treatment is that we can reach incredibly precise levels of concentricity and therefore accuracy. With this approach, we can even manufacture an efficient 400 mm long drill at just 3 mm in diameter! For a perfectly clean hole, we equip this wood drill with two spurs at the cutting head, in order to protect these cutting spurs it is important to ensure that the 
drill is always perfectly secured in the chuck before drilling.
We offer these tools in four different overall lengths: 150, 250, 315 and 400 mm long. In all lengths, we have the diameters 3/4/5/6/7/8/9/10/11/12/13/14/15 and 16 mm. We also make metalworking drills for deep holes in the same range of sizes (series 2599).
We have now created two new sets of 1599 wood drills, in the sizes most commonly chosen by our customers, presented in a high quality, German made, beech wood box:
Of course, it is possible to buy replacement FAMAG drills individually.
The seven-piece set, item number: 1599.507, includes the Ø 3, 4, 5, 6, 8, 10 and 12 mm in the total length 250 mm. These are the most commonly ordered diameters of this series.
Furthermore, we also provide a more comprehensive set in the total length of 150mm. This set includes all important diameters 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 mm. Item number: 1599.510
You can get these new sets in a good specialist shop. Ask your dealer or contact us, we know where to find your nearest dealer. You can reach our sales daily from 8:00 - 16:45 on +49 (2191) 9284-0.
Experiences, questions, suggestions or criticism? Bring it on! We are always glad to receive your message at info@famag.com or call us at +49 2191-9284-0.
