Mathew Reed. I bought a drill grinder from Lidl, because it was only £15.00. It says it can grind drills from 3mm dia to 10mm. I wanted it to grind small drills.
Here is a report. The main body construction is adequate. It comes with 3 detachable 'units' for use as a knife sharpener, a chisel grinder, and drill sharpener. The chisel grinder works ok and gives a good square edge to the chisel prior to honing, it has an adjustable angle table. The drill grinder is interesting. The drill is secured along a vee groove using a thumb nut, and so the centre line of the drill changes ,(relative to the fixed rest on the grinder), depending upon the dia. This is a big dis-advantage. As the construction of the holder is only plastic there is a lot of un measurable movement which leads to very poor results on small drills. Aligning the drill ready for re-grind using the instructions and stops on the unit is really not very good and if you don't know how to grind a drill to start with, the unit, in my opinion, would be un usable. However I got good results when grinding a 10mm drill, which is the interesting bit. For £15.00 you get the opportunity to reverse engineer the drill grinding unit and make it accurately from steel, improve the drill alignment system and end up with a really good workshop project and a drill grinder that you could trust. As an off the shelf drill grinder it is of little use,in my opinion, but then I don't have a problem grinding drills off-hand. Hope this has been of some use. Roy M.