Test : Are milling drill bits really working ?
Since few years a new type of drill bit is available on the market. This milling drill bit is made to be used both as a standard bit for normal drilling but also for small milling to enlarge a hole or make a goove or a fence.
Center part of the drill is replaced by many small teeth like a cilindrical wood-rape.
We decided to test one of these in order to check its real milling capabilities.
Test was made with 5 mm standard plywood.
For drilling operation, no diference was noticed compared to a conventional drill bit.
For milling / cutting, first part of the test was made using a cordless drill (12V ; 1200RPM capability). Even in 5 mm ply, result was quite disappointing, needing very long time to cut few milimeters. and consequent effort on the drill to progress in the wood.
Then we decided to install the bit on a normal drill (500W 2500RPM). Result was completly different with real milling capabilities and efficiency. This is mainly due to the higher rotation speed.
To conclude if you use a cordless drill, this type of drill bit will be limited to small work as enlarging diameter of a hole. But it will have more use with a more powerfull drill. It can be uses with wood and soft metals as aluminium, cooper or brass. The only limit will be the thinkness of the material (5 mm in metal and 2 cm in wood seems to be a realistic limit) as more you will increase thickness more the milling will be hard and long.
Anyway it can be usefull for DIYers if you don't have correct bit size or if you want to do oblong holes.
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