It sounds like marketing nonsense. Buy our drill it has 4 functions. Oh but we made up the 4th one....
Sometimes when using a flat bit for chiselling you need to change the rotation, my bosch lets you just twist the bit round with your hand through about 8 different positions where it sort of clicks into place.
I can only guess unlocked allows this feature whereas locked keeps it stuck.
It doesn;t make sense though as my bosch doens;t wander around, it stays in the same position.
Yeah i did think it was marketing bull....but that makes sense about twisting it around.
Normall I just swithc to drill mode and stop when its where i need it lol
Yeah my makita has a position half way between rotation and hammer that lets you alter the plane in which the chisel is aligned. I think my bosch does too.
Neither of them are marketed as 4 mode drills as you can only actually use the drill in 3 modes.
The only firm who were marketing a true four mode SDS+ drill was Metabo (UHE2650). They have a couple of SDS+ drills with rotation stop + hammer, rotation with hammer, rotation no hammer (0 to 950rpm) and high speed rotation only (for drilling, 0 to 2500 rpm) - all rotation is reversing also. Even they seem coy about trumpeting this as an advance, though
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