Asian 4x6 Band Saw V belt sizing

[Manxmodder]

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. 

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.

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.