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Asian 4x6 Band Saw V belt sizing

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Manxmodder:

--- Quote from: philf on April 10, 2014, 05:22:54 PM ---superc,

I've just had a look at my saw (made by Clarke) and with a 50Hz 1,420rpm motor the three speeds given in the manual are 65, 95 & 165 ft/min. I checked the blade speed on the 65 ft/min setting with a Deumo mechanical tachometer and it's correct to within 1 ft/min.

Even with 3,800 rpm motor output this would only give 174, 254 & 441 ft/min. (By the way - 3,800 rpm doesn't sound right for an induction motor.)

Assuming your gearbox has the same ratio as everyone else's then I'm stumped.  :scratch:

As Stuart pointed out 1,110 ft/min might be OK for wood but for sawing even aluminium with a HSS blade it's many times too fast.

Phil.

--- End quote ---

Phil,I have the Axminster swivel head version saw,on which the 560 watt motor runs at 1720 rpm at 50hz.

The blade speeds are given as 23, 34 & 54 m/min.

Regarding speed ranges of these type of motors,as you say, 3800 rpm does sound extremely high, even if the motor was of the 2 pole type(normally around the2700- 3000rpm mark)....OZ.

lordedmond:
Evan at 60hz a two pole or as I refer it's a single pair of poles

At its best it would be 3600 rpm with no slip synchronous running ,at normal slip it would be about 3550 rpm

I would guess some tyke has replaced the motor

The whole belt speed does not add up for a metal cutting band saw , but and it's a big one it may have been like it from new we all know the QC

Stuart

superc:
Nah, the 1/2 inch belt definitely kicked up the speed.  Looking forward to the arrival of a belt the same size as the original.  Let''s see what happens.

LoL to motor specs.  The glued on paper Shop Force left on mine says a 1/2 hp, OR a 3/4 HP may be used.  No spec plate exists on the motor casing.

A quick google for AC motors shows many types fit the 1/2 or 3/4 "spec."  Which type they stuck on it is anyone's guess.

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