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Old Sep 29, 2004, 10:39 AM
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how to glue magnets in pairs end to end

Squeeze the pair into a small "O" ring. Ca glue the ends together . Gently remove the "O" ring to use it on the next pair. Voila' one magnet from two.
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Old Sep 29, 2004, 11:08 AM
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How I drill even spaced holes in the bell

Machine a "plug" to fit perfectly in hole of drill press plate (pic 2). Notch disc with evenly spaced intervals. 5,6,13?. Drill a corosponding hole in the base of your harbor freight $39. drill press. Tighten plug, disc and bell together with drive shaft diameter bolt. Hold disc still with C clamp.
Fast easy dependable.
jimbo
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Last edited by Eljimb0; Sep 30, 2004 at 12:10 AM.
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Old Sep 29, 2004, 06:40 PM
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re flux rings

Some sizes in car exhaust pipes are usefull,go raid the cut off bin at your local exhaust centre,they only throw them out anyway
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Old Oct 08, 2004, 12:00 PM
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Soldering Jig

I needed soldering jigs to solder setscrew hub on cans and to make extended cans for double stator motors. When making the second jig I realized it could be modified to do both jobs. It's easy to use and results in true running cans and the lightest double cans (8g) available. It's easy to make if you have a lathe and can be purchased from Strong RC Motors if you don't. Hubs and can extensions cut from standard cans are also available.
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Old Oct 08, 2004, 11:14 PM
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Recycle use for old speakers

This is a scource for motor builders for flux ring material,a speaker manufacturer here in melbourne imports very special magnetic iron wich machines very nicely,to make pole pieces used in his speakers,so save any old speakers the centre pole piece in particular.
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Old Oct 10, 2004, 10:06 AM
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Removing enamel on wires

Having briefly skim-read this thread I see people have found quite a few methods for removing the enamel from copper wire to allow them to solder to it. Here's my method! Put some solder on the end of a hot soldering iron so it forms a big molten blob. Hold the end of the enamelled copper wire in this blob and wait for the enamel to burn off - you can tell when this happens because smoke is given off and the solder then sticks to the copper.

Job done
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Old Oct 12, 2004, 01:26 AM
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Re flux rings

I just pulled apart an old magnavox 10" speaker ,the centre pole piece measures 38x23mm with a 10mm hole a nice lump of the right kind of metal thinking on about machining flux rings, what do you think about on one end of the flux ring if one turns down it to half thickness a 1.2mm length male shoulder and on the other end a female so if you want a double or a tripple ,just loctite as many as you want together ? as this is not a chat thread ,any pms' answered.
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Old Oct 12, 2004, 08:41 PM
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try again

ill get it right
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Old Oct 12, 2004, 10:58 PM
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Well here is one tip, not sure if its been posted yet, I didnt see it.... when you have to fit a GB custom Endbell into a GB custom Fluxring which almost needs a press to do this, put the endbell into the freezer for an hour and the flux ring in the oven at 200 degrees for 15 min. Use an oven mit and assemble the parts which should go together pretty easy... also when you heat the flux ring lay it on its end not side...
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Old Oct 14, 2004, 11:25 AM
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I was wondering, wouldn't angled holes offer better ventilation to the interior than this? When those motors get spinning fast every little cooling trick helps

Quote:
Originally Posted by Eljimb0
Machine a "plug" to fit perfectly in hole of drill press plate (pic 2). Notch disc with evenly spaced intervals. 5,6,13?. Drill a corosponding hole in the base of your harbor freight $39. drill press. Tighten plug, disc and bell together with drive shaft diameter bolt. Hold disc still with C clamp.
Fast easy dependable.
jimbo
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Old Oct 16, 2004, 11:38 PM
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another cdrom tip

I found that some cdrom drives have a small belt and motor that operates the tray. Some of these small belts are just the right thickness and diameter to serve as a spacer at the bottom of a 22mm can to keep the magnets from sliping to the bottom of the can.
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Old Oct 20, 2004, 05:18 PM
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Magnet placement

48mm Inside diam Can with 10 magnets
Draw a circle, with 10 spokes (36 degrees apart) - I used a CAD package (but lots of other ways)

Cut it out, put it in the Can and mark the inside walls with a marker pen

Position the first magnet
Let the 2nd magnet attach to the first - now flip it over and slide it around to the next marker
Repeat around the can

BEFORE you glue them in place - use a small Bar magnet to check that you have got the correct NSNS....

Now glue them in place
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Old Oct 20, 2004, 08:12 PM
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Quote:
Originally Posted by SMaric
BEFORE you glue them in place - use a small Bar magnet to check that you have got the correct NSNS....
It has been only once when I messed up the polarity of the magnets. After I implemented simple method I have always magnets the way they ahould be.

1. Lay all the magnets side by side on the flat steel bar (I use old caliper). Make sure every mognet repeals it's both neighbors - they just don't want to stick to each other. This is 100% proof that all magnets have the same pole up.

2. Use permanent marker (or any marker that will stay for a while) and "paint" all magnets from the top.

When I install magnets in NSNSNS pattern I always set every other magnets with painted side up. It is easy, as they don't want to stick to each other. Then I tack glue them in place so they don't move. Then I install remaining magnets this time painted side down. I use a toothpick to position them in place.

Easy, and you don't need a lathe to do that.

RysiuM
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Old Oct 20, 2004, 11:17 PM
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For magnet placement, just place the magnets so that the "sides" of the magnets ( The thickness ) attract each other. If they repel each other, you've got it wrong, flip the magnet and it should get fixed.
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Old Oct 21, 2004, 02:49 AM
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Fitting for a 3mm shaft

My Floppy disc motor had a 4mm shaft

Rather than trying to make a shaft coupler
(only found a Meccano 3mm - 4mm coupler & that was 20mm long with a 10mm OD)

I have found that you an get some plastic tube/pipe connectors (for Homebrew/chemistry piping)
In the UK they're sold as 'PolyPipe' connectors

You need to run a 3mm drill through them - but that's easily done - then they are a good snug fit (tapered) into the 4mm hole in the Can
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Last edited by SMaric; Oct 27, 2004 at 04:59 PM.
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