From: null@void.com
"Jim Wilkins" writes:
> "Richard Smith" wrote in message news:m1ldsc42kf.fsf@void.com...
>
>>If using flat-belts (or any other belt drive) that needs 2
>>countershafts, for a 3-stage speed reduction?
>
> https://woodgears.ca/big_bandsaw/pulley.html
>
> ...
Hi again
Prices came in on 0.75kW motors = 1HP.
This is all "clean new start" - don't have to fit in with anything
before.
"Inherently" single-phase motor:
1ph 4-pole motor - so on 50Hz is 1500rpm.
Coming in at about GBP160, then tax at 20%
Convert 1ph to 3ph and get 2nd-hand 3ph electric motors:
"Digital" converter - GBP250 for 1HP - then tax.
Is 240V only (GBP420 if can do 440V - "star and delta")
So needs "dual voltage" motor - assured most in last 30 years are (??)
Says - typically fine for one-person user - only one machine at a time
- but can start ancilliaries like pumps etc. after big machine
running. Not "DOL" - has to be simple switch.
That's about 1HP converter can drive 1HP motor IF the digital
converter does a "soft-start" - and if one motor already running,
cannot "soft-start" the "new" motor (stating the obvious).
Didn't ask if offers speed-control - ability to control over +-30%
range would be a blessing - not have to vary speed with different
pulleys.
The "digital" 1ph-to-3ph is a good brand.
Folk - any guidance?
It would do me a lot of good to get this project done, so I am not
going to sweat this too much - in the absence of being shown the way,
I will likely get the single-phase 0.75kW motor, do the belts and see
this thing running a.s.a.p.
In a lifetime, sometimes it's better to get that next step done and
know all about what you'd do next when it comes around again.
Regards, Rich S
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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