Gallery, Projects and General > How to's
Asian 4x6 Band Saw V belt sizing
PekkaNF:
What about 50/60 Hz difference?
I should check the speeds on my metric machine and see how they compare.
Pekka
superc:
DaveH, that's a good point and further evidence of the variation in these things. The speed numbers I wrote above are from the photos linked to by ManxModder. The sticker on the motor of my own is also 80, 120, 180.
For those not familiar with Jaquets Indicators, these things are early manual tachometers designed specifically for the purpose of checking and adjusting the speed of spindles, conveyor belts, cog wheels, saws and the like in factories or in the field when making repairs (say on a combine or a tractor's PTO). They are very accurate. Electricity and changes in technolgy has led to them pretty much being replaced by cheap electronic laser readers, but the hand held mechanical things can still be special ordered although I note with some bemusement the newer ones work in meters rather than inches, feet or yards. My understanding is Jaquet started marketing them through HH Sticht sometime around 1910 but by 1990 switched manufacturing emphasis to cheaper plastic and laser readers. Multiple versions exist, some with faceplates set up to show RPMs, some with faceplates set up to show inches or linear feet per minute, some with hi-lo ranges, some (like mine) that don't care, some with both the RPM and the linear feet per minute reading shown plainly on the dial, some with a built in 3 second chronometer, some with a built in 6 second chronometer. You select one kind of probe for pressing against the central axis of a shaft or a spindle to get an RPM, or a wheel of the appropriate size for getting a linear reading. Both HH Sticht and Jaquet are still in business.
http://www.vijaytradesyndicate.com/index.php/textile-instruments/jaquet-swiss-make-mechanical-tachometer
Manxmodder:
superc,can you check your motor for spindle rpm with that mechanical tacho.
Let us know what reading you get....OZ.
superc:
Okay. Did so. Interesting. Must be a two pole motor. This is probably pushing the upper limits of my 60 - 90 year old tachometer or at least the upper limits of my ability to count how many revolutions of the small hand in six seconds. The first time I blinked and missed some RPMs, so no more fast stuff. Comes out with no load on the pulleys at about 3800 RPM.
Manxmodder:
Interesting,as the specification plate on the shopforce motor in the link I provided earlier shows a photo giving the motor speed as 1700rpm,which is about what I would have expected,and would be roughly the same as the rpm on my 6x4 saw.Link reproduced again for convenience.
http://auction.ridofstuff.com/details.cfm?ID=1326490#photos
Maybe you could also check how many revs of the of input/driven belt pulley are needed to produce one full turn of the driven saw blade wheel....OZ.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version