3 ms·
That "four to five hours" didn't make any sense to me either. Perhaps they meant that doing this for a batch of bits takes that much time? It also struck me as
by s1mon 4y ago
That "four to five hours" didn't make any sense to me either. Perhaps they meant that doing this for a batch of bits takes that much time?
It also struck me as disappointing that the actual grinding of the flutes was not really shown. I'm sure it would be hard to photograph as it's likely completely bathed in cutting fluid, but perhaps they could have done a run without it just for the video?
- hulke 4y agoThe "four to five" hours they mention is probably the time required to setup the grinding center, maybe dress the wheels, do some fine adjustments on the grinding process. Once the machine is setup, grinding each drill is just a few minutes. The grinding machines they are using seems to require quite a bit of manual handling, but cnc grinding center where everything is automated also exists. Actually, the grinding of the flutes is shown very briefly around 3:35. Filming this operation on such a small scale is difficult because of the geometry of the system and the grinding process: the drill blank is supported from below to prevent the carbide from snapping under the load, and the wheel grinds from above. The grinding wheel is order of magnitudes larger in diameter than the diameter of the drill it is grinding. Also, everything is flooded with cutting fluid. There are hundred of videos showing the process on youtube if you look for "cnc grinding drill".