Induction motors

[fred]

What is the power difference approximately between a 700w motor and a 550w induction motor in a pillar drill ?

[Brian Gaff (Sofa 2)]

Are you talking about brushed motors vs induction motors? It really depends on the design of the motors in question. I feel that brushed motors generally have more torque, but there are induction motors with control circuits these days that compensate for saturation effects. Brian

[Dave W]

150w

[FMurtz]

:)

[Dave Plowman (News)]

Mine is a 500w induction motor and have rarely found it lacking in torque. Although I only ever use the lowest speed gearing anyway.

The previous one was IIRC 350w and prone to stall when using things like a hole saw.

Of course as with everything, you can never have excess power. ;-)

[fred]

to paraphrase 'You cant' be too thin or too rich and now also too powerful'

[The Other Mike]

Almost exactly equivalent to having a five legged horse and chopping a leg off. But much depends on whether they are genuine UK/IEC horses fed on hay or chinese ones fed on rice, fruit bats and snake remains :)

550W correctly reduced in speed via a pulley system and preferably a steel geared gearbox will mean, at least with a correctly sharpened drill bit, you'll easily be able to drill 1 inch diameter holes in mild steel plate. Restraining the item you are drilling could be the bigger issue.

If it's a chinese horsepower without gearing then it could be 1/4" in plastic or wood

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[Dave Plowman (News)]

A 1" twist drill? Crikey. ;-)

[T i m]

I have a set of 'blacksmiths drill bits' that go up to that size (diameter <g>). I mainly use them when counter boring softer materials on the lathe as they are quicker than say a 13mm bit then boring bar.

Cheers, T i m