Thread: Centauro 450NL

Originally Posted by rev

All things considered, I think your least expensive option is to install a single phase motor and recoup what you can by selling the three phase one in the marketplace here.
Cheers

Here is one: LEESON 1.5HP SINGLE PHASE MOTOR | Miscellaneous Goods | Gumtree Australia Port Adelaide Area - Enfield

Leeson motors are very well made.

Cheers

If you are sure you are going the VSD route, you could buy the VSD and run it on the motor you have until you find a suitable motor.
surely 60% power is better than nothing

Stuart

p.s. That will teach me to post after having the window open for hours on end. If you can get a $45 motor that fits and you don't need Vspeed I'd be tempted.

Originally Posted by rev

Here is one: LEESON 1.5HP SINGLE PHASE MOTOR | Miscellaneous Goods | Gumtree Australia Port Adelaide Area - Enfield

Leeson motors are very well made.

Cheers

I agree about the Leeson motor being well made.
Last week I picked up a 240V/415V, 3 phase, 1.5HP unit for $30 which I am putting on my DP.

It seems there are a couple of motors up on gumtree that could be suitable. I'll measure the shaft length and diameter when I get home tonight hopefully.

I had a closer look at how the motor mounts and keeps tension on the pulley, and it is a on a hinged platform with a threaded bolt that can be adjusted to increase pulley belt tension, some low quality pictures below, it was a bit dark last night when i was trying to take them...



and it just uses an old standard belt to run on



I've been poking about looking at different castors or casters as some people say. To mount the machine too and found these, they are a little expensive, but if they work and are hassel free they are probably worth it. (leveling castors)

WoodRiver Machine Leveling Caster Plate Mounted 4 Pack - Amazon.com



Cheers

Simon

Originally Posted by simonmags

I've been poking about looking at different castors or casters as some people say. To mount the machine too and found these, they are a little expensive, but if they work and are hassel free they are probably worth it. (leveling castors) . . . .

I would only class them hassel free if they bolted straight onto the saw but if you do that the table will be too high so you will need to make up some hefty offset brackets or a frame of some kind so I think there are better solutions out there that will do the total job with less mucking about.

Something like this will cost you less than one of those castors

Any tips for removing the current pulley from the motor shaft?



You can just make out the keyway in these photos



Cheers All

If you are after casters these look similar but less expensive:

Display Products

Originally Posted by BobL

I would only class them hassel free if they bolted straight onto the saw but if you do that the table will be too high so you will need to make up some hefty offset brackets or a frame of some kind so I think there are better solutions out there that will do the total job with less mucking about.

Something like this will cost you less than one of those castors

This looks like a hot price! You could just bolt or weld the 4 corner pieces with wheels and stabilisers to the saw frame if you wanted permanent mobility.

Originally Posted by simonmags

Any tips for removing the current pulley from the motor shaft?



Cheers All

Undo any grub screws/holding bolts which will be locking the pulley onto the shaft/key use a suitable sized puller, if it's a steel pulley you can heave on it a bit more than if it's basic cast iron (brittle), if it's still recalcitrant a little bit of gently applied heat on the pulley, give the head of the center bolt on the puller a bit of a whack with a hammer (with tension applied) repeat this if you get movement, it will get easier as it comes off, be careful not to damage the head of the bolt tho, best also is if you rotate the puller with the pulley as a whole, that way you don't detroy the center in the end of the shaft, (bolt stays still) be careful tho as the usual thing to do is chuck a bit of pipe thru the legs of the puller which tends to lift at least one leg off the pulley, (moreso a 3 legged puller) if it still won't budge you will need to get onto the back of the pulley right down at the shaft and that's a whole other setup, it looks relatively clean tho so it probably will be ok......there's a few to be going on with...




Pete

Originally Posted by Stustoys

If you are sure you are going the VSD route, you could buy the VSD and run it on the motor you have until you find a suitable motor.
surely 60% power is better than nothing

Stuart

p.s. That will teach me to post after having the window open for hours on end. If you can get a $45 motor that fits and you don't need Vspeed I'd be tempted.

I'd actually go with Stu's first suggestion - a semi-decent VSD is going to give you nice things like soft start which can help with belt, blade and tyre wear (no jerky starts) and give you a measure of speed control. You could even over-frequency your motor if you wanted to get a bit more speed out of it.

A 3ph motor is going to put out a lot more torque for a given HP, so to replace a 1.5hp 3ph motor (with no loss of quality), you're going to have to go to at least a 2.5hp 1ph motor. And it's going to be bigger. And heavier.

Plus, if you get your VSD put out to a socket (might need a legality check here, but pretty sure you can get away with it and keep to the rules), you might be able to re-purpose it for other 3ph tools that you might want to get in the future?

Cheers,

Matt

Well I've finally gotten a solution to my power issues, I ended up getting a 2.5hp single phase motor for the right price off a friend of mine. So tonight some maths as I work out what the existing SFPM (Surface Feet Per Minute or Blade Speed) that I have on the existing motor. The new motor has a slightly larger pulley attached so I believe will run a bit faster blade speed.

I'll be using a couple of websites tonight to work the existing SFPM and the new motor's SFPM. One is this handy little calculator I found for giving the SFPM:
Calculate Band Saw Surface Feet per Minute (SFPM) | VintageMachinery.org


And some light reading about SFPM recommendations from a couple of different sites:
Speed Rate - Why is it Important?BandSawBlog
Did You Know | Suffolk Machinery - Timber Wolf Bandsaw Blades

Cheers

So if I leave the currentl pulley that's on the motor and install it asd is i'll end up with:

Calculated SFPM:6,309

or if I pull the old pulley off the 3 phase motor and reinstall it on this single phase motor then i'll have:
Calculated SFPM:4,913

hmmmm decisions decisions

I think i'll have to change the belt over if i do anything which means pulling the wheel off, which i've been trying to avoid...

Well the decision was made easy for me by the fact that the pulley wouldn't come off the old motor and a pulley puller, or bearing puller was 50 to 95.00 down at Repco. So I've pulled the bottom wheel off and have bought a new belt, slightly longer so the new motor and pulley have some room.

My BS runs at ~6400fpm, it might help make a decision.


Pete.