Battle hardening motors

have you ever rolled up the Milliput, like in ball-bearing form and tested it? is it hard as rock? flexible? semi-flexible?
I’m definitely not familiar with Milliput.

I’m doing some experiments “for science” with Qwik Steel

If you ball it up like a ball bearing you can whaCK THE SHIT OUTTA THIS STUFF with a hammer, bounce it on the floor, it’s hard as shit, and like the milliput it is super easy to work with… mix it up really good, make a small play-doh worm out of it, jamb it in the crevice, and smooth it… it doesn’t clean up with water, that’s one of the things I like about it…
and it has a pretty good working life…

4 Likes

I avoided that because of the steel because doesn’t that make it conductive?

1 Like

And magnetic… I would say it’s probably not a good idea @kook

Milliput dries rock hard and is temperature resistant to 130C

3 Likes

magnetic… hmmmmmmm why eggzakery @Lee_Wright? right next to the magnets is a fully magnetic rotor/can…

what’s that magnetic field strengthening theory where magnetic mass is added to the rotor can… faak I forget… and it may not even apply…

I’m going to test this out for science… I’ll use a beat-up old kwad BLDC motor and see where this leads me…

3 Likes

“Steel reinforced” is the issue, methinks.

2 Likes

There is also https://avesstudio.com/shop/apoxie-sculpt/
This is my preferred epoxy material. It smooths with water as well as has a decent working time. I’ve never tried it on windings though.

2 Likes

I understand all of that… but isn’t there a fully magnetic rotor can that the magnets already are attached to?

If that fails…
There is always aluminum reinforced epoxy putty, it works on radiators:

https://www.jdindustrialsupply.com/qu7epst.html?gclid=CjwKCAjwhOD0BRAQEiwAK7JHmCCdffW9kJ1eGBzMEZX_pVBcgqCDHoru_UB0OJ0XYyOVfIDrpNvLHRoC5GgQAvD_BwE

QuikAluminum, by Polymeric Systems Inc., is an aluminum-reinforced epoxy putty stick formulated to quickly repair or rebuild anything made of aluminum. This fast-setting, industrial-strength aluminum epoxy bonds tenaciously to metals, curing tough and hard. No measuring or mixing tools are required for use, as each stick contains pre-measured portions of activator and base throughout and its putty-like consistency eliminates drips and runs for “no-mess” applications. Repair seams in rain gutters and downspouts, seal leaks in aluminum boats, fill in dents in recreational vehicles, rebuild torn screw holes in storm windows and doors, mend machine parts and castings, or repair leaky radiator, aluminum tanks and tubing. QuikAluminum can be drilled, tapped, machined, ground, filed or painted in just 60 minutes after application. Solvent and VOC-Free, this hand-mixable epoxy is non-rusting and will not shrink or pull away. Best of all, the unused portion stays fresh for future use when stored in its original packaging.

2 Likes

Because steel contains iron. Let me know how easily it goes in those cracks mate, keen to hear an after action report!

1 Like

Faaaaaaaaaaaaaak I got high and fergot the reason I was sent down this train of thought…

excuse me… I got high! faaaaaaaaaaaaaaaaaak…

People have been using ferretically*(my word)*-enhanced JB-Weld to afix magnets and battle harden motors for-fucking-ever but JB-weld is so pedestrian (sorry @b264) and messy, then I remembered qwikSteel and how easy it was to work with and how fukking strong it was…

so I’m 99% sure this will work… but even so, I’m going to do proof of concept on a $9 quad BLDC motor before I commit this unspeakable horror on a $100 esk8 motor…

:face_with_hand_over_mouth: :shushing_face: :face_with_hand_over_mouth:

8 Likes

This compound melts. It’s also brittle don’t do this particular thing.

2 Likes

Hmmmm it says “EXHAUST SYSTEMS”, right on the label… so disregarding sage advice I trudge forward…

but I have place marked your wisdom for later castigation if required!

EDIT:

I’ll do a pull test on a set of magnets in a bell once I see if ferritic content effects the motor adversely…

3 Likes

i was always under the impression that my outrunner rotors were aluminum cans
i dunno though :man_shrugging:t5:

2 Likes

all of the Esk8 motors have Iron in the bell/rotor/can

all of the (Premium kwad motors) have some sort of 700 series alum. bells, for weight savings…

faaaaaaaaaaaak I’ll be back

KababFPV on motors

EDIT TLDR:
bob talks about motor design. I knew I’d seen it somewhere he calls the rotor/can a bell as we do in kwads, or a “Flux Ring” and states from motor experts how

  • all motor bells are conductive

  • magnetic flux

  • cogging… no NOT THAT COGGING the cogging feeling when hand rotating a motor, and how and why it’s not good… it shows how strong, and also how weak the magnetic flux is

  • motor mfrs. are battling this cogging in many ways one is bu reducing the distance between magnets

  • elofty motors actually have NO gap between magnets… each magnet physically touches another magnet, and there is zero cogging

  • check out the ZMX motor bell and flux management

  • poorly designed flux management can cause radio interference… (this will require a whole other subject)

  • I lied above… all of my motors have a conductive flux ring on the bell, some however are pressed into 700series alum. for weight

  • i’ll be back

3 Likes

Most of my concern about conductivity is attempting to battle harden the stator around the sensor PCB if it’s not conformal coated. Magnetic flux mysteries aside, that would just be shorting a PCB potentially.

1 Like

This is only bell/rotor/can flux ring battle hardening…

fukk stator battle hardening

1 Like

Who knows, if I were on the price is right… 90% chance it’s going to be fine then. But, I am that dumb guy that would bid $2500 on an especially nifty looking ikea cabinet.

Further evidence, this is the song that is currently playing in my headphones.

2 Likes

frenetic

Maybe not melts, but the stick I used disentrigrated and got flakey

1 Like

I;ve used this same shit in the frontier used it to seal up crankcases and radiators, qwiksteeled pesos and rocks to aluminum… I think yours must be passed it’s used by date…

faaaaaaaaaaak am I gunna haveta go to the “shop” and get my qwiksteel… maybe tommorrow,

I am undeterred

2 Likes