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Forum Index : Windmills : joining two F&P rotors

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brucedownunder
Newbie

Joined: 18/07/2004
Location: Australia
Posts: 1
Posted: 09:39pm 04 Aug 2004
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  I thought about how to align the two rotors carefully and came up with the following.

from a rather large plastic sewer/water pipe (300-400) mm I cut ,with a hand saw a 60mm ring off. measure very carefully to get as parrallel a piece as possible-take your time . cutting is easy,then clean the edges.

Now, carefully measure the INSIDE circumferance of the magnetic rotor with a piece of string and cut it precisely.  Transfer this length of string around the OUTSIDE circumferance of the "ring" -you will have some waste. Cut this waste off after using a square to accurately mark the lines.

Now the fun part --as you will see,the ring is still too big a diameter to sqeeze into the rotor-without breaking it -- I used my electric heat stripper to gently heat all around the piece and then gently pushed it together to form the new correct size ring --

Try this and see if it is a snug fit into the magnetic rotor--if it's too big ,(mine was) ,then back to the vice and cut a small strip off again.

Now heat it again and try to get it into the rotor. Once you have it correct and a sliding fit into the rotor ,let it sit and rest for the night .

 

This is now your alignment former to join the too rotors together using fibreglass --but , you now have to space the two rotors by around 16mm. 

I haven't done this yet , but glenn has made a plastic ring for this "spacing" , which I think is the best way to go .

 

More as I progress

Bruce

bushboy
 
JA Robby

Newbie

Joined: 20/07/2010
Location: Jamaica
Posts: 13
Posted: 04:46am 10 Aug 2010
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hi all first time posting here, i need some help i have a leeson motor 1/2hp, 110 volts,1450 rpm.Which i would like to use to make a windmill,would i have to rewind
the motor or just add magnets to the rotor.whats the best magnets to use on this
rotor and also would i be getting good volts to charge a 12v battery.




JA robby
No man is an island.
 
Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 06:46am 10 Aug 2010
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Hi JA Robby,

It would be polite to start your own thread and not to hijack someone elses like you have tried to do here.

I understand we all make mistakes when we join a forum and is why i point this out now.

Pete.


Thanks Pete

GlennEdited by Gizmo 2010-08-11
Sometimes it just works
 
Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333
Posted: 07:11am 10 Aug 2010
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Hi Bruce,

Just wondering if a strip of sheet metal would be easier than the pvc as it would shape easier and the magnets would hold it in place.

One idea for the spacer could be some MDF as it is about 16mm thick.

It could be wise to run a layer of sticky tape around the joint of the 2 stators before you apply the resin/glass to stop the resin seeping into the inside of the joint, as it tends to find its way into everywhere you dont want it.

Resin dont bond to plastic very well (not at all) and would pay to rough the surface well to help it to key onto it better.

You might find it dificult to get the glass to curve around the edges nicely, one trick i have done it to place it in a plastic bag after layup and then you can work with it and it not stick to everything it touches.

You can also suck the air out of the bag and it will wrap the glass tight around the object, But this can cause the resin to squash into some void areas like inside the stators if you have over saturated the glass with too much resin.

An old fridge compressor works well for removing the air. (vacuum bagging)

Once the resin has cured the plastic will peal off easy.

Besure to wax the insides of the stators well so if any resin gets in you will be able to break it out after.

Pete.
Sometimes it just works
 
VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539
Posted: 02:52pm 10 Aug 2010
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Hi Bruce

Wouldn't it be easier to use a brake drum turned out to get the correct diameter rather than trying to get two wobbly rotors together?

All the best

Bob
Foolin Around
 
brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548
Posted: 04:43pm 10 Aug 2010
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Gee Guys ,,,, that was 2004 , a lifetime ago for a critter like me????

It's in a box somewhere,, If I remember correctly , it became too wide and being supported by just the 30mmm or so of splined area , touched at different places while spinning ..thats touched on the twin stators outer fingers.

I guess I'll re-visit this fun game one day with the LG rotors, they are metal and their stator hubs are a removable tough plastic moulding which could be modified with steel .

PhillM came up with some good ideas using collets for securing . Might be a good idea to search his posts ,long time back .

( just got up to throw another log on the fire,cold wet and pitch black up here )

See ya's

Bruce.
Bushboy
 
VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539
Posted: 12:29am 11 Aug 2010
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Hi Bruce

Sorry about that, it popped up on the screen and I thought it was a currant work in progress. I was interested as I was thinking along the same lines for one into two unit I was looking at using a brake drum and hub assembly, with the brake drum turned out to suit the diameter and fitted with neos, as these have just arrived.

I am also doing a LG but a single as I haven't been able to get a second motor yet, I believe they are available new, but haven't gone that track yet.

Good weather to set by the fire or do a bit in the workshop. Had the new solar feed meter fitted this morning, finally after six months, what a wizz bang bit of gear it is, need a degree in computer science to work it out.

Back to the workshop.

All the best

Bob
Foolin Around
 
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