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Re: Mysterious shift in saw alignment


 

Glad to hear it cuts well George.
Your 1HP motor will never heat up on a 4x6, as its only running at 1/3 to 1/2 the load the motor is capable of.
You'd think that Consumer Guarantee legislation would stop the dishonest practice of inferring that input power is the same as output power.?
It works like this:?
The maker states the maximum motor current, so you can spec the supply wiring (I think that's law some places).??
Funny how LOTS of motors just happen to draw 6.8Amps at 110Volts.
So the power drawn from the mains supply is 6.8*110 = 748Watts?
Oh but - WOW -? there are 746W in a horsepower - our motor is 1HP

In reality induction motors are somewhere between 30% and 60% efficient; the more cheaply made, the lower the efficiency.
So a claimed 1HP motor drawing 6.8 amps might deliver less than 1/3HP
I don't think you'll see motors stating input power as output on their motor plate, because motor manufacturers are bound by NEMA and IEC rules to state output (horsepower is a 'rate of doing work' (ie. its output) not 'rate of consuming power (input).?
But brand owners are not bound like this.?
Check for yourselves The Grizzly 4x6 G0622 (last old style 4x6 that with Grizzly brand - see manual in the Files section) claims it has a 3/4HP motor and its draws 5A maximum current (5x110=550W input Watts, divide by 746 = 0.737 - near enough 3/4'HP' so is clearly input power), while their replacement 3/4HP motor ( draws 10.3A @ 110V (over double!).
Yet even Grizzly are inconsistent with their bandsaws.? The Grizzly G9742 swivel-base version (?which has the same sawframe (but maybe not motor) claims a 1/2HP motor that draws 8.8A @ 110V (= 968W - much more likely)??
Shame and double shame alright Bill, on all those who cheat - jv

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