The Natural Philosopher wrote in message ...
cisco kid wrote:

Hi All - My problems with power tools is that the manufacturers seems
to have redefined the enginnering term power and do not quote torque
or impact values very often. I mean brake horse power - which I
believe should mean the actual delivered power at the tool bit when
when all the other losses such as bad internal design limitations,
gearing, friction etc have been taken into account. So if my Bosch is
delivering 500 watts bhp then with the same drill piece it should be
worse than a 1000 watt NU tool. Of course it is'nt!! So maybe the
trades description boys should get in here. Or redefine a proper unit
of power tool measurement. As far as quality of build well there
another story.


An electrc motors efficiency varies dramatically as the load varies. Its
not possible to give accurate output powers on them: Its not actually
possible even to give accurate rated input powers, since again as
voltage caries - and it does as batteries sag - the amount of input
power that doesn't *quite* cause meltdown or demagnetisatin varies
considerably (thats DC motors) On AC motors its still pretty indefinite.

Just learn your tools

Check out the Dewalt cat. lists in and output power on non battery
tools interesting reading

Steve