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2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

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>> No.739178 [View]

>>737894
FYI
aprox 10 hr operation time and still going fine.

>> No.737894 [View]
File: 175 KB, 1280x960, P12-07-14_11.21.jpg [View same] [iqdb] [saucenao] [google]
737894

>>737659
here is the new commutator in place.
you can see the countersink holes where the epoxy has filled them, I'm hoping this helps.
the tab ends helped a bunch. after the rough in I put the hose clamp back on and bent the tabs down to meet the stubs of the old commutator plates, then blob soldered 'em.

>> No.737659 [View]
File: 145 KB, 1280x960, P12-06-14_15.41.jpg [View same] [iqdb] [saucenao] [google]
737659

>>733764

here is the new blank for the commutator plates.

two things different
a. solder tabs on end of plates
b. countersink hole at other end of plate for extra glue hold area

>> No.736851 [View]

>>736651
napa steel weld epoxy.

I'm not sure if the heat from soldering degraded the bond or what but about half the commutator plates came off after about 4 hours of operation.
I now have to remove the remaining plates and ready the core for a new try as well as make a new set of commutator plates. Luckily the slots I made last time were extra long, all I need to do is extend them a bit and taper the ends.

I intend to try a slightly different soldering style as well as some things to make the epoxy work better. Much easier to show & describe than try to explain.

>> No.736143 [View]
File: 189 KB, 1280x960, P12-03-14_09.28.jpg [View same] [iqdb] [saucenao] [google]
736143

>>736026
thanks anon, but maybe not so great

>pic related

epic fail of adhesive after aprox 4 hr use.

as Marvin says "oh well... back to the drawing board"

there is still enough material from the copper fitting to try again without purchasing anything so I do believe I will try again.
I'm not sure if the failure was heat related from the soldering or what, but I've had an idea and am going to modify the procedure slightly. I'll report back in a day or so with pics

>> No.733784 [View]
File: 156 KB, 1280x960, P11-28-14_13.45[1].jpg [View same] [iqdb] [saucenao] [google]
733784

>>733736
materials < $6 3/4 copper sweat fitting, new brushes and springs.

>pic is receipt with part # for brush. it's a 0.375 X 0.75 X 0.75 chunk that I cut down to fit my brush holders

>> No.733775 [View]
File: 174 KB, 1280x960, P11-27-14_11.38.jpg [View same] [iqdb] [saucenao] [google]
733775

>>733771
>Anything you'd do differently next time?

ya, I'd use some masking tape or something to protect the end of the windings.
while removing the last of the old commutator plates I slipped and nicked the wires a couple of times, no show stoppers luckily.

>pic is squaring up the ends of the old plates

>> No.733767 [View]
File: 192 KB, 1280x960, P11-28-14_12.05.jpg [View same] [iqdb] [saucenao] [google]
733767

>>733766

>> No.733766 [View]
File: 174 KB, 1280x960, P11-27-14_13.29.jpg [View same] [iqdb] [saucenao] [google]
733766

>>733765

>> No.733765 [View]
File: 152 KB, 1280x960, P11-27-14_11.31[1].jpg [View same] [iqdb] [saucenao] [google]
733765

>>733764

>> No.733764 [View]
File: 166 KB, 1280x960, P11-27-14_14.20.jpg [View same] [iqdb] [saucenao] [google]
733764

>>733763
thank you

this is the first time I've tried to rebuild a commutator

>> No.733737 [View]
File: 166 KB, 1280x960, P11-28-14_11.48[1].jpg [View same] [iqdb] [saucenao] [google]
733737

>>733736
and here is the same armature after the commutator rebuild

>> No.733736 [View]
File: 180 KB, 1280x960, P11-27-14_12.12.jpg [View same] [iqdb] [saucenao] [google]
733736

I just completed a DIY that actually went better than I thought it might. The heater blower fan in my vehicle was not working and I didn't want to spend the $120 for a replacement fan. I had done my best last winter with it and replaced the brushes when it failed. With winter upon us it failed again as you can see why

>pic related

I found an instructables that showed how to rebuild the commutator and I went from there,

>> No.719147 [View]

>>718692
>Any idea how to make some sort of vehicle and personal radar?

there are a couple of developements in passive radar you might be interested in

http://www.rtl-sdr.com/passive-radar-dual-coherent-channel-rtl-sdr/

>>718699
>It wouldn't be possible.
wrong

>> No.719123 [View]

>>718945
you should read the material here
http://www.animations.physics.unsw.edu.au/jw/electricmotors.html

you may find this helpful

>> No.718654 [View]

>>717785
>anyone ever replace a LNBF with a oven magnetron?

not exactly, but I have a lot of experience working with very similar situations.
I hope you understand that doing these kinds of projects can be dangerous and illegal.

If you have specific questions I'll try to answer them

>> No.623634 [View]
File: 142 KB, 800x600, wireSpotWeld.jpg [View same] [iqdb] [saucenao] [google]
623634

>>623401
>Kind of why I made that spot welder.

I hope you don't mind a couple of suggestions.

The drawing I have made is crude but I think it will help convey what I'm talking about.
If you use an overlapping weld as shown in the>>623227
it will not work well for the chain mail rings, as they can't move well. If you make a butt weld in the rings it might work better. The (pinchers / anvils / contacts ?) not only carry the electricity to cause the heat / weld, they are shaped to form the molten metal into a form similar to either side of the weld. Since the contacts won't be touching the molten metal for long, and being made of copper / brass to conduct electricity they also conduct heat away very well and should stay cool enough to keep their shape. While the weld produced is not a lumpy overlapping thing with jagged edges.
>pic related

>> No.623465 [View]

>>623448
>KFC in south Chicago, cleanest parking lot awards. when upper brass try to pry secret out of local manager after several years of spotless parking lot in shittiest area in town manager refuses. brass finally find out that manager takes all food at closing and throws it away per SOP but... and it's a big but he packed it neatly in a clean bag and carefully placed it in dumpster. he had a deal with local street peeps... clean leftovers for keeping riff-raff and shit out of his KFC parking lot... needless to say as soon as brass found out manager was fired

>> No.623443 [View]

>>623410
>I dont think so.

I do. I can crudely cut steel now using this modified MOT and a carbon gouging rod.

and you need to pay more attention to the posts you have replied to two different individuals. I (OP) want to make a home made DIY plasma cutter. Another anon in commenting about a 3rd anon said "needlessly complicated" about a capacitive discharge device.

>> No.623409 [View]

>>623398
spend the money and get solid oak or hickory for the stakes. the rails can be a soft wood like pine, but the stakes need to be strong to take the stress and wear.

>> No.623408 [View]

>>623401
I must admit a spot welder is good method for welding wire. The weld is kinda poorly shaped for chain tho isn't it?
Do you have a timer of some sort to control the current pulse or is it all manual?

I guess if you do it right you could end up with a pretty seamless weld,

>> No.623288 [View]

>>623285
OK... all I know is the secondary windings in>>623226
are not #6awg

I gotta ask, is there a reason you arranged the transformers and windings the way you did?

It looks like the two cores are in magnetic opposition. did you do that to limit core saturation?

>> No.623277 [View]
File: 323 KB, 933x710, MOT.jpg [View same] [iqdb] [saucenao] [google]
623277

>>623276
oops frogrot to post pic

>> No.623276 [View]

>>623257
#6 awg wire ~ 0.16 inches in diameter

that is NOT what is shown in>>623226
>pic related

wire size A is 3/0 or bigger
wire size B might be #6awg or #8awg but is more likely #10 or #12

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