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What about old sawblades?
By Jerry, Section Homebrewed Electricity Posted on Wed Oct 15, 2003 at 10:26:43 AM MST
Old saw blades for disc?

I have a freind that has a saw sharpening shop. Since I'm in timber and lumber country some of these blades are quite large but 12 inch blades are very common. Could these old retierd blades be used for disc alternators or is the steel wrong? Is the steel hard at the teeth and soft at a smaller diameter than the teeth? JK TAS Jerry

What about old sawblades? | 8 comments (8 topical)

Re: What about old sawblades? (none / 0) (#1)
by Homebrewed12vdc on Wed Oct 15, 2003 at 11:13:26 AM MST

I tried this one, and found that the blades flex to much, not a good choice.

Re: What about old sawblades? (none / 0) (#2)
by Jerry on Wed Oct 15, 2003 at 01:18:49 PM MST

Could you bolt 3 or 4 together. This should stop flexing? JK TAS Jerry

Airheads Page

Re: What about old sawblades? (none / 0) (#3)
by sean on Wed Oct 15, 2003 at 05:44:18 PM MST

Good idea to bolt em together, how about welding them together?......sean

[ Parent ]

Re: What about old sawblades? (none / 0) (#4)
by DanB on Thu Oct 16, 2003 at 06:26:22 AM MST

As they come (depending on the magnets you use) they'd probably not be thick enough... considering both the strong forces of two rotors pulling against one another - or one rotor pulling against laminates. The steel is not ideal...

But if you bolted or welded 2 or 3 together, I think it would be fine!

[ Parent ]

Re: What about old sawblades? (none / 0) (#5)
by jubalearly on Thu Oct 16, 2003 at 08:48:07 AM MST

Sounds like crude laminations to me. The best improvement in efficiency will be if you can insulate them from each other with paint or some other thin coating. Motor laminations use a layer of oxidation (blueing, not rust). The idea is to provide a low resistance path for the magnetic field but not for electricity.

I'm not sure how this will work with axial rather than radial flux but it can't hurt, you just may not see much difference. The moving magnetic field may cause these to shake, flex and rattle unless you firmly attach them in several areas. I'd be inclined to overdo that with some kind of nut on the shaft, 3-4 bolts near the center, and welded edges.

Do let us know how this works

Re: What about old sawblades? (none / 0) (#6)
by wooferhound on Fri Oct 17, 2003 at 03:42:59 PM MST

I thought that you do NOT want laminations in the material that the magnets are attached to. That the better the material conducts tha magnetic flux to the next magnet, the more power from the coils . . .

I really like the saw blade Idea for the rotor, it's almost already made, and I have a buncha them layin' around . . .

. >=- W o o f -=<
[ Parent ]

Re: What about old sawblades? (none / 0) (#7)
by Jerry on Fri Oct 17, 2003 at 09:37:10 PM MST

Thanks Woof I agree about the lamination. Thats for behind the coils but solid I think is good to secure the magnets to. If it wern't the Volvo disc boys would be in truble. So solid metal behind the magnets and laminations behind the coils it is. I'm just gona cut the teeth off the saw blades and bolt them together. I hope the metal below the teeth is soft? JK TAS Jerry

Airheads Page

[ Parent ]

Re: What about old sawblades? (none / 0) (#8)
by troy on Sat Oct 18, 2003 at 03:35:15 PM MST

Yes, as per other comments, you don't need the magnet rotors laminated/insulated. And you do want them thick enough that you can't detect any residual (wasted) flux through the back of the rotor, implying that the vast majority of magnetic flux is traveling in a magnetic circuit through the exposed face of the magnet into the coil. But there's no real disadvantage to stacking saw blades to achieve that thickness and stiffness so long as there's no real air gaps between blades.

Happy recycling and bolting,

troy

[ Parent ]

What about old sawblades? | 8 comments (8 topical)

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