Author Topic: Newman machine replica (Read 138052 times)

CLaNZeR · « **Reply #90 on:** June 23, 2007, 01:15:54 AM »

Quote from: Dingus Mungus on June 23, 2007, 12:33:05 AM

@Mramos
Great replication! Thansk for helping out with the scope shots. no BEMF though...
I noticed you're using heavy 18 awg wire. How many feet of wire is in your coil?

@Clanzer
How long did your stepper motor winding robot take to make your coil?
Are you still planning to wind a denser coil? I'll trade you fresh spools for coils...

~Dingus

I ran it pretty slow, the steppers were running at a pulse of 140us which is 406mm travel a minute, but you can pulse those small steppers upto a max of about 35us pulse width 1625.6mm a minute.

The coil was wound 85 rotations to the middle axle support rods, then skipped 17mm and wound another 85 rotations ats 0.25mm a rotation.
Too late to do the maths this end, but it did not take long to nearly do 2000 winds even at slow speeds LOL

Let me try it out this weekend and if it looks promising I will be more than happy to wind a coil for any of the guys that have shown interest in this thread so far and post it out to them. But lets get it right first!

Got to use up this 3.2kg spool of wire somehow LOL

Regards

Sean.

CLaNZeR · « **Reply #91 on:** June 23, 2007, 01:17:31 AM »

Quote from: hartiberlin on June 23, 2007, 12:44:00 AM

Quote from: CLaNZeR on June 22, 2007, 10:57:42 PM

Are normal motor brushes any good placed with a gap obviiously to get the Arc? what are they made of ?

Yes,these are also made out of high durable conductive graphite.
Use them and make a fine tip out of them so they just barely
contact the copper commutator plates and have a gap in the commutator
plates, so they make only contact not all the time, but in sparking pulses.

Thanks Stefan

Will try with wire first but have some old motors here that I can strip the brushes out of and put on the grinding wheel.

Time for bed now as knackered LOL

Regards

Sean.

Dingus Mungus · « **Reply #92 on:** June 23, 2007, 01:38:19 AM »

@Clanzer
Well thats sounds down right convienient...
I just got 150 feet of 26awg that I'll use to make my first pot motor replication,
but as you said once we start getting it "right", I'm hoping to send you another
multi killogram spool in exchange for a nice big coreless coil base like yours. I just
hope I don't get in to TPU replication in the mean time! It's like crack I tell you!

THANKS TO ALL FOR YOUR HARD WORK!
~Dingus Mungus

CLaNZeR · « **Reply #93 on:** June 23, 2007, 07:57:16 PM »

Grrrrrrrr DO NOT Wind a Coil as below because it causes a not so nice Sticky point/spot

(http://www.overunity.org.uk/clanwound1.jpg)

The rig is finished below but shame about the coil.

(http://www.overunity.org.uk/newmansticky.jpg)

Have a look at the video attached and you will see that when the ring magnet is vertical and I touch the Comm, then yep sure enough it kicks away, but because of the gap in the middle of the coil I get a nice sticky spot.

Off to wind a new one at a angle maybe hehehe

Regards

Sean.

TheOne · « **Reply #94 on:** June 23, 2007, 08:12:09 PM »

i am not sure if its related to the coil, i think your communicator is 90 degree offset?

CLaNZeR · « **Reply #95 on:** June 23, 2007, 08:55:50 PM »

Quote from: TheOne on June 23, 2007, 08:12:09 PM

i am not sure if its related to the coil, i think your communicator is 90 degree offset?

Hi TheOne

I moved the tape to various positions on the shaft and found the best kicked was when the Ring magnet was vertical outside the coil. Sometimes it would do a full revolution and the spark would set it off on it's next but most of the time it would hit the spot in the tube where there is no wire and stop solid.
If I applied the power on full time the Ring Magnet would sit in the coil gap and you could not move the axle either way, it was stuck fast as such.

I am 90% this is the coil, it is no hassle to wind another one quickly and will see.

Cheers

Sean.

CLaNZeR · « **Reply #96 on:** June 23, 2007, 11:44:43 PM »

Did not get time to wind the new coil today as had to do a bit with the family, but managed to mill out a new end cap and cut some 80mm acrylic tube ready for winding as below.
Nice thing about using acrylic tube is that I can cut a 10mm hole and mount some mini bearings and do away with the axle holders that I had to use with the cardboard tube.

What I plan to do this time while winding is to poke out of the bearings on the acylic tube about 10mm of rod and just let the winding machine run the wire over these, then I will simply remove the rod and push the slack wire to the side before taping up. This should give me the full coil coverage I need.

(http://www.overunity.org.uk/clanzprewind.jpg)
More tomorrow

Cheers

Sean.

CLaNZeR · « **Reply #97 on:** June 24, 2007, 09:19:37 PM »

Well she runs, have attached a picture and Video.

The coil now has no gap after a bit of messing around with coil winding machine and it kicks around the full rotation now.

I am running it with a 12 Volt Battery and it is pulling around 10ma as can be seen on the video.

The coil is now 2000 winds of 0.25 wire around a 80mm tube and is exactly 200 ohms.

With this much resistance in the coil it seems hard to get a spark as no current is hardly being pulled, but it has been running for over 1 hour now and there is a very small spark and the battery has now dropped at all.

Also I am not sure on whether the NEO ring magnet is a good or bad thing, umm might try get a Ceramic and see if there is a difference.

Going to mess around with the timing a bit to see if I can get some more RPM's out of it. I measured it with a laser Tacho earlier and it was doing 200 RPM.

Cheers

Sean.

CLaNZeR · « **Reply #98 on:** June 24, 2007, 09:23:50 PM »

Quote from: mramos on June 24, 2007, 04:58:19 PM

Sean,

When you wind the new coil, can you make the coils more horizontal than vertical on the tube (flower pot). Same wraps, but in a smaller area so they stick out more (say you had a 2" wide coil on each size, make is 1").. Also, I have a lot more on the criss-cross of the axle. And my fire point is when the ring is a couple degrees past the winding. And man does it throw that thing around with 12volts. Why I need more windings

Sounds like something is surely wrong with that first coil.

I have been in family mode as well, and looks like I will be today as well. So I am out until next week, not sure I have enough wire to get 200 ohms anyway.

Mike

Oh, there is a post on a peturbing static field you might want to look at as well. Looks pretty simple if it works.

Hi Mike

I think you will find that if you increase your windings the kick on the motor will not be as powerfull but it will pull less current.
I am going to strip down the 1st coil and cut it back to 50 ohms and prove whether I am right on this.
Will let you know!!

Darn weekend is going fast again so runnign out of time, but only 7 weeks left and might be working back home during the week

Cheers

Sean.

CLaNZeR · « **Reply #99 on:** June 24, 2007, 10:51:23 PM »

Stripped the 1st coil back to 39 ohms and spread the wire across the middle.

Just as I thought over 1000RPM and hell of a kick, nice spark with the lights out but pulls 50ma at 12volts.

Video attached.

Cheers

Sean

TheOne · « **Reply #100 on:** June 24, 2007, 11:34:25 PM »

ha looks better now!

the conclusion about all this replications is maybe we can get some OU out of hit but not that much to usefull stuffs ?

hartiberlin · « **Reply #101 on:** June 24, 2007, 11:36:53 PM »

Hi Sean,
well done,
but at 50 mA as in the second example, you are draining your battery too much...
Better would have been to keep the 200 Ohm winding, so you have more wire and
go to 24 Volts input , so put 2 batteries in series.

Anyway, now please try with your current setup in the 50 mA case to light
a 2 to 3 Watts incandescent bulb.

Just connect it there, where you have the ampmeter now.
So remove the ampmeter and connect there the bulb.
Or just short out the ampmeter with the bulb.

Many thanks.

CLaNZeR · « **Reply #102 on:** June 29, 2007, 04:41:22 PM »

Quote from: hartiberlin on June 24, 2007, 11:36:53 PM

Hi Sean,
well done,
but at 50 mA as in the second example, you are draining your battery too much...
Better would have been to keep the 200 Ohm winding, so you have more wire and
go to 24 Volts input , so put 2 batteries in series.

Anyway, now please try with your current setup in the 50 mA case to light
a 2 to 3 Watts incandescent bulb.

Just connect it there, where you have the ampmeter now.
So remove the ampmeter and connect there the bulb.
Or just short out the ampmeter with the bulb.

Many thanks.

Will try the bulb this weekend when back home.

Not happy with the strength or straightness of the existing magnet and axle but...
have managed to source two 45mm by 4mm neo ring magnets from Germany and will run the axle all the way through this time and mill out a new custom holder. This should help cut down the friction and make it alot smoother.

If the magnets have arrived home I will post an update over the weekend.

Cheers

Sean.

CLaNZeR · « **Reply #103 on:** June 29, 2007, 06:13:28 PM »

Quote from: mramos on June 29, 2007, 05:50:07 PM

Sean, was that really yours with a bent shaft, left end was all over.. LOL..

Looks good.

I did not make it for the 1600 feet of wire this week (mpja.com), but will add that I have left and re-wrap this weekend. I need to get graphite on mine as well.

So hope to play this weekend.

I keep seeing this wheel that have magnets and no sticky point, I might try a small version on the red bearing wheel as well

The bent shaft grrrrrrr I know, I know LOL

I milled out a magnet holder and then tapped both ends of it so I could screw two seperate Rods into it. In the rush I screwed one of them in too tight and hear a not so nice crack. This was fine for the first 50 or so turns but then it started to wobble!!
The next one will be alot more stable I promise hehe

What wheel do you keep seeing?

? more info please

Cheers

Sean.

CLaNZeR · « **Reply #104 on:** June 29, 2007, 10:09:55 PM »

Quote from: mramos on June 29, 2007, 07:33:09 PM

Sean,

Here in the wheel video. There is a thread on it here too. Looks interesting..

http://www.youtube.com/watch?v=91iCppzXuXw

Thread:

http://www.overunity.com/index.php/topic,2482.0.html

Ah this one, yep looks good but I think he may come up against the back drag when he places either another Stator or extra magnets on the disc at 180 degrees.

Have seen a few designs getting past the sticky point/spot but as soon as you add an extra Stator magnet or Rotor magnet it fails because it is surprising even on a big wheel the effect the extra magnets have even at a distance.

I demonstrated in this thread below how you can get past the sticky point/spot with MuMetal
http://www.overunity.com/index.php/topic,2527.0.html

But in saying that you got to keep trying and nice wheel he has there.

Just got home for the weekend this end but no new magnets to play with

Cheers

Sean.

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