(I am that machinist etc guy across the street from your dad) We had dryer motor fail. I took it apart and found one of the magnets came loose....poorly glued! Your glue & micro-spheres fix between magnets etc is a great idea for much better holding power.....also keeps moisture from dryer out of those areas. I'll no doubt use the micro-spheres for other applications to add control and lessen the running & dripping problem in tougher situations. If motors were made this way it would sure increase their life times. Thanks for your knowledge sharing!
Hey Roger! Glad the fix worked. It was the first time I heard about micro-balloons but they really do make the epoxy easier to use. It's also a bit easier to sand and shape after it cures too.
I used to build battle bots out of RC cars with nails melted into the fenders and drill motors and circular saw blades. In the 20 years since then, I've learned a lifetime of electronics and mechanical knowledge. This channel has inspired me to build a new bot, I've learned so much from watching you. The fights on TV were always cool, but this is what I always wanted to see from them. Thank you!
Robert, I really appreciate the videos you put out there. Its very handy both seeing guides likes this, as well as build reports and post battle breakdowns of the bot. You are doing a great thing for the community :)
Actually the blue epoxy in the bell is for rotational balancing which you're undoing by filling the gaps with epoxy. Although I guess for your application perfect balance isn't as important as it would be for the usual aerial use.
looks like you could use a 5cc syringe and applicator needle and just squirt it into the gaps as needed. They make blunt end needles specifically for applying glues and lubricants.
Back in the 'old days' with brushed motors the UK HW builders would machine plastic or aluminium inserts for their motors to keep the magnets in place. I guess they could have used expoxy but it would have taken so much that it was probably cheaper to custom machine blocks and if the motor did break they could move them to the new motor.
seems like a great 3D printer project to make a "wiper" jig, especially for the inside scraping. fits around the shaft with a silicon wiper blade. I have an idea in mind but no motors to test out the idea.
I had that exact same idea, but decided to just test it out with a small motor. It went so well I never ended up making the wiper. But I'm sure that would work great.
This is fucking cool. I used to watch battle bots back in the day and they were always getting rammed and having motors stop working pretty easily...I never understood it. It's crazy to see how far this stuff has come along over the years, that people are doing stuff like this to the motors. I guess if I ever make one of these things now I know :)
Good to have seen this done and will try myself. I know you mentioned other epoxies, and I can’t help but wonder if a “metal” epoxy like JB Weld might afford even more holding strength. Anyway, just bought some glass microspheres through your link. Thanks for another cool video.
love you videos so well done and i do like your machining videos as im a cnc setter/programmer and enjoy seeing what you make lol keep them vids coming.
Just buy a big box of those crappy plastic syringes and use those. Mix the eppoxy externally when when it's the way you like it put it in. You can even buy ones with extended nozzles that end at an angle for getting all the way down inside the outrunner.
Since I’m using this for a Electric skateboard application which has motor sensors and all that good stuff , will this affect the sensors And or the rotation of the motor ?
what is your opinion on battle hardening these cheap escs? I know some people have expoxy covered the boards parts excluding the fetts. i wonder if there would be any issue with using electronic potting epoxy to dip the esc and let the extra run off then when hard heat shrink and have the whole thing a solid mass?
Hi! Lived the video! I had a question regarding combat robot categories. So in the US, ant-weight is 450 grams (1 lb) right? What's the size limit in this category for rollers? Thanks!
Not sure what problem you're trying to solve. Plaster would be very brittle, and wood fibers wouldn't be very strong, and could potentially be heavier.
Robert, does this reduce the audible noise (whistle noise) at high rpms? If not would you explain what was the purpose behind what you showed in this video. Thank you!
If you do it poorly, it might be slightly off-balance. But for combat, it will be driving ~8 pounds of spinning metal that's not nearly as balanced, so it shouldn't make any difference. I can practically balance a nickel on my chassis when the weapon is running, there's very little vibration.
You could always try your own balancing by holding the motor in your hand, adding temporary mass to a side until it feels smoother, then add a more permanent mass. That’s if your motor seems extremely unbalanced, but most likely won’t matter due to the large mass of weapons
My antweight doesn't have enough room in it for a pulley system so I have to use direct drive. This will help a lot in preventing damage, the shaft has already bent just from hitting some coke cans >.>
Just did my first set of drive motors. Same as yours 4238. I found i was able to clean up the shell later with a little cordless die grinder on slow speed with a little wire brush. Came up perfect and the brush unlike sandpaper does not start to wear parts of the shell. Also i opted only to glue the shell/magnets in and not coat the windings as my theory is if you fill the grooves in the windings the motor cant draw air through to cool. What are your thoughts? Why did you opt to glue the windings as they dont move and seem solid enough no to come apart during shock?
I loved them, very good motors. I went an entire competition on the same motors. They're still fine and I will use them at the next event. After going through 2 competitions, I only broke one motor, which is good considering the hits I took!
@@RobertCowanDIY can you tell me the torque for this motor or how to calculate it? I am looking for a brushless for sumo mega combat, but i don't find the torque constant anywhere.
The heating issue is due to vibration caused in the molecules of glass fibre when magnetic field flux cuts through it. I m saying if you add such substance which have very poor permeability(i think those stiff molecular settings) will not have heating issue if used in glass fibre. Example, if u add iron fillings the glass fibre portion will heat up toouch, so i guess using those substance which have lower action reaction for magnetic field. Sandpaper is good idea to give even finish. I seen this first time, thanks for posting such videos. It helps
I'm here because I have invented something which teenagers will use which has these types of motors. So I need to battle harden them for teenagers to use and not break the product lmao
I thinking about to do that with my very huge alien aps 7000w motors, I'm just scared about the heat! Doesn't the engine overheat more easily if I seal it like this?
Technically, yes it does insulate the motor and it will get hotter. However, a motor with shattered magnets doesn't really do anything. Trust me on this one, do this or you'll have shattered magnets. Let's say the epoxy DOES cause the motor to heat up more. If that extra insulation makes the motor overheat in 3 minutes, you have other problems like mechanical friction or you're pushing the motor too hard.
@@RobertCowanDIY thanks for your fast awnser! the braking with the motor heat them up! That's why I'm think that can be a problem on my moutain e-skate!
@@adriankern1006 Those are very different applications. You don't typically use braking on a weapon motor, it will generate a lot of heat! It's also not important to spin down the weapon quickly, only spinning it UP quickly.
I'm sure it would work, but it would be very tricky to get it into all the places you need it to go. You need something with a bit more viscosity to it. You could certainly try the putty, but I'm not sure what problem you're trying to solve by using that instead. It's just going to be harder to use.
There are far too many variables missing from this question. What's the voltage, what's the MOI of the weapon, what's your target tip speed, what's the diameter?
I think people are over-thinking the additional weight. The motor weighed 329 grams before adding epoxy and 333 afterwards. So I'm adding 4 grams to a 300+ gram motor, or adding 1.2% extra. I doubt that's enough to make it off-balance, but I could be wrong.
jamble7k I don't think it matters but a lot because I just got some unbalanced motors from bangood and those are like so much wobbly and I didn't cook any esc ,and my doubt we can just apply it for stator
OK something is off with utube or my account.....this video says I disliked it and that is not true ....I only liked it ...I love Team Rob (COPPERHEAD)...I REALLY DONT KNOW ....I'm sorry
(I am that machinist etc guy across the street from your dad) We had dryer motor fail. I took it apart and found one of the magnets came loose....poorly glued! Your glue & micro-spheres fix between magnets etc is a great idea for much better holding power.....also keeps moisture from dryer out of those areas. I'll no doubt use the micro-spheres for other applications to add control and lessen the running & dripping problem in tougher situations. If motors were made this way it would sure increase their life times. Thanks for your knowledge sharing!
Hey Roger! Glad the fix worked. It was the first time I heard about micro-balloons but they really do make the epoxy easier to use. It's also a bit easier to sand and shape after it cures too.
You did an awesome job framing it for the camera and letting us see exactly the "tactile feel" of what's right
I would recommend wearing a respirator for the particles of glass beads, also doing it in a ventilated area for the apoxy
I used to build battle bots out of RC cars with nails melted into the fenders and drill motors and circular saw blades. In the 20 years since then, I've learned a lifetime of electronics and mechanical knowledge. This channel has inspired me to build a new bot, I've learned so much from watching you. The fights on TV were always cool, but this is what I always wanted to see from them. Thank you!
Robert, I really appreciate the videos you put out there. Its very handy both seeing guides likes this, as well as build reports and post battle breakdowns of the bot. You are doing a great thing for the community :)
thanks so much!
Actually the blue epoxy in the bell is for rotational balancing which you're undoing by filling the gaps with epoxy. Although I guess for your application perfect balance isn't as important as it would be for the usual aerial use.
AH, ok. Yeah, throwing off the balance isn't a big deal, not when you're adding 8 pounds of spinning mass...
This is awesome. Big help for a new builder. In process on my first antweight.
thanks!
Accidental ASMR, I would be coming back for this video for many times in the foreseeable future...
Oh, it was no accident! Kidding.
00:00 Intro
00:28 What's Needed
02:40 Before/After
05:40 Process Synopsis
06:29 Mixing Epoxy
09:15 Stator Hardening
17:15 Rotor Hardening
25:50 Outro
Awesome, thanks! Added! I have way too many old videos before the chapter feature existed.
Thanks for sharing your tips!
looks like you could use a 5cc syringe and applicator needle and just squirt it into the gaps as needed. They make blunt end needles specifically for applying glues and lubricants.
This could certainly work, but it's thick enough for it to not be an issue. I just didn't have any syringes on my at the time.
i never knew people did this
not everyone does and it's not absolutely necessary, but it really does help prevent motor issues.
I opened a sander once and they use epoxied motors to try and stop things breaking from the vibration.
Back in the 'old days' with brushed motors the UK HW builders would machine plastic or aluminium inserts for their motors to keep the magnets in place. I guess they could have used expoxy but it would have taken so much that it was probably cheaper to custom machine blocks and if the motor did break they could move them to the new motor.
this is very helpful,thnx Rob
seems like a great 3D printer project to make a "wiper" jig, especially for the inside scraping. fits around the shaft with a silicon wiper blade. I have an idea in mind but no motors to test out the idea.
I had that exact same idea, but decided to just test it out with a small motor. It went so well I never ended up making the wiper. But I'm sure that would work great.
explained really well
This is fucking cool. I used to watch battle bots back in the day and they were always getting rammed and having motors stop working pretty easily...I never understood it. It's crazy to see how far this stuff has come along over the years, that people are doing stuff like this to the motors. I guess if I ever make one of these things now I know :)
There's a lot of little tips and tricks to keep stuff running when it's being beat to hell.
Wow... Really nice idea! Thanks Robert
Good to have seen this done and will try myself. I know you mentioned other epoxies, and I can’t help but wonder if a “metal” epoxy like JB Weld might afford even more holding strength. Anyway, just bought some glass microspheres through your link. Thanks for another cool video.
I've used both the normal 5 minute epoxy and the 'metal' one. I haven't seen one fail yet, so I can't comment on any difference.
does the metal epoxy conduct heat better?
@@revimfadli4666 Good question Revi, I wonder this as well
Thanks for this, really informative!
love you videos so well done and i do like your machining videos as im a cnc setter/programmer and enjoy seeing what you make lol keep them vids coming.
thanks, I plan on making many more videos like this.
I know this is an old video- have you ever tried using thermal adhesive instead of standard epoxy? Might avoid heating issues.
How to remove stuck pulley on the motor shaft?
Just buy a big box of those crappy plastic syringes and use those. Mix the eppoxy externally when when it's the way you like it put it in. You can even buy ones with extended nozzles that end at an angle for getting all the way down inside the outrunner.
Since I’m using this for a Electric skateboard application which has motor sensors and all that good stuff , will this affect the sensors And or the rotation of the motor ?
That's a good question! My motor is sensored also! Did you know it now? Did you test it? I'm also scare about the heat
what is your opinion on battle hardening these cheap escs? I know some people have expoxy covered the boards parts excluding the fetts. i wonder if there would be any issue with using electronic potting epoxy to dip the esc and let the extra run off then when hard heat shrink and have the whole thing a solid mass?
Hi! Lived the video! I had a question regarding combat robot categories. So in the US, ant-weight is 450 grams (1 lb) right? What's the size limit in this category for rollers? Thanks!
Curious, what is the temperature rating of the epoxy you are using?
How would this apply to electric skateboard hub motors?
Would you recommend doing this on a sealed motor?
love ur videos man! I would love it if you could mill some things for me. Do you have a website with prices?
Would this work with some other filler? Something like fine wood or polycarbonate sawdust? or maybe plaster?
Not sure what problem you're trying to solve. Plaster would be very brittle, and wood fibers wouldn't be very strong, and could potentially be heavier.
Robert, does this reduce the audible noise (whistle noise) at high rpms? If not would you explain what was the purpose behind what you showed in this video. Thank you!
Check the description.
Do you have any tips for brushed motors - apart from Kitbots' guide? I know I'm an old grandpa for continuing to use those but I'm learning
But won't the rotor will be unbalanced after this? Could you test for vibration before and after the epoxy infill mod.
If you do it poorly, it might be slightly off-balance. But for combat, it will be driving ~8 pounds of spinning metal that's not nearly as balanced, so it shouldn't make any difference. I can practically balance a nickel on my chassis when the weapon is running, there's very little vibration.
Yeah, I guess you're right. After a few nicks out of the weapon it becomes a moot point. Excellent vids BTW.
You could always try your own balancing by holding the motor in your hand, adding temporary mass to a side until it feels smoother, then add a more permanent mass. That’s if your motor seems extremely unbalanced, but most likely won’t matter due to the large mass of weapons
My antweight doesn't have enough room in it for a pulley system so I have to use direct drive. This will help a lot in preventing damage, the shaft has already bent just from hitting some coke cans >.>
Just did my first set of drive motors. Same as yours 4238. I found i was able to clean up the shell later with a little cordless die grinder on slow speed with a little wire brush. Came up perfect and the brush unlike sandpaper does not start to wear parts of the shell. Also i opted only to glue the shell/magnets in and not coat the windings as my theory is if you fill the grooves in the windings the motor cant draw air through to cool. What are your thoughts? Why did you opt to glue the windings as they dont move and seem solid enough no to come apart during shock?
absolutely agree
Would you recommend doing this for brushless outrunners in antweights? I just want to make sure that I'm on the right track.
Absolutely. Any brushless motor that's going to see combat can benefit from this. There's almost no downside.
@@RobertCowanDIY Awesome. Thanks for letting me know.
Can same this can be done with the DC motors???for middle weight category???
Sure, the process is pretty similar, you're just using epoxy to make sure the magnets stay where you want them to stay.
Does this work for all weight classes or different weight classes have different methods
The process is pretty much the same for all weight classes. We did the same thing on our heavyweight motors.
Did you end up liking using the propdrive motors? Would you recommend them to someone else or would u pick a different motor.
I loved them, very good motors. I went an entire competition on the same motors. They're still fine and I will use them at the next event. After going through 2 competitions, I only broke one motor, which is good considering the hits I took!
@@RobertCowanDIY can you tell me the torque for this motor or how to calculate it?
I am looking for a brushless for sumo mega combat, but i don't find the torque constant anywhere.
The heating issue is due to vibration caused in the molecules of glass fibre when magnetic field flux cuts through it. I m saying if you add such substance which have very poor permeability(i think those stiff molecular settings) will not have heating issue if used in glass fibre. Example, if u add iron fillings the glass fibre portion will heat up toouch, so i guess using those substance which have lower action reaction for magnetic field. Sandpaper is good idea to give even finish. I seen this first time, thanks for posting such videos. It helps
Would you still be able to do this with inrunner motors or is this technique specifically for outrunner motors?
SpunkyWizard I guess it works on those too assuming you can open them and apply the epoxy neatly. Commercial products use epoxied brushed motors
just use a thicker epoxy. I use kwikweld and it's pretty thick
I'm here because I have invented something which teenagers will use which has these types of motors. So I need to battle harden them for teenagers to use and not break the product lmao
This is really more for shock. You would need to do some stuff in the electronics to make sure they don't overheat and such.
I thinking about to do that with my very huge alien aps 7000w motors, I'm just scared about the heat! Doesn't the engine overheat more easily if I seal it like this?
Technically, yes it does insulate the motor and it will get hotter. However, a motor with shattered magnets doesn't really do anything. Trust me on this one, do this or you'll have shattered magnets. Let's say the epoxy DOES cause the motor to heat up more. If that extra insulation makes the motor overheat in 3 minutes, you have other problems like mechanical friction or you're pushing the motor too hard.
@@RobertCowanDIY thanks for your fast awnser! the braking with the motor heat them up! That's why I'm think that can be a problem on my moutain e-skate!
@@adriankern1006 Those are very different applications. You don't typically use braking on a weapon motor, it will generate a lot of heat! It's also not important to spin down the weapon quickly, only spinning it UP quickly.
Robert, did y'all do this to Copperhead?
Of course. All the motors were epoxied. I'm pretty sure every team does this with their motors, or else the magnets just explode into dust.
Would it be practical to battle harden a fairyweight motor?
If you have the weight to spare, yes.
so would this make a motor quieter? there is always noise when turning a motor even when it's unpowered
No, if anything, it will be noisier. If your motor is noisy when it's unpowered, you most likely have some crappy bearings or dirt/dust somewhere.
@@RobertCowanDIY no its a large direct drive motor, these always make noise when turning
epoxy will not stick to shoe polish .put some in the bearing . you can by a stuff that serves the same purpose from Brownells gunsmithing supplies
Could you use flour?
um, do you mean flour? I'm not really sure. I'd probably just do plain epoxy before I tried that.
haha yeah, okay. Probably a horrible autocorrect gone wrong.
Would 15 minute epoxy make your life easier? Or would it be to runny?
You can certainly try it, I'm just telling you what worked best for me.
Would epoxy putty work for this?
I'm sure it would work, but it would be very tricky to get it into all the places you need it to go. You need something with a bit more viscosity to it. You could certainly try the putty, but I'm not sure what problem you're trying to solve by using that instead. It's just going to be harder to use.
How many kv scorpion motor is sufficient for 16 kg weapon moving
There are far too many variables missing from this question. What's the voltage, what's the MOI of the weapon, what's your target tip speed, what's the diameter?
33.3 voltage
My target tip speed is approx 10k RPM
My weapon is virtical spinner
Weapon diameter is 14cm but with its teeth its diameter is 20cm
can I use sand instead of the micro sphere................
No
Can I do this in rov motors ?
are they unique in any way? motors are motors usually. what are you trying to protect them from?
@@RobertCowanDIY from water, because i see in other tutorial the people use this techniques
@@MiguelEduardoVenegasMonroy This isn't intended to waterproof a motor, but to keep the magnets from exploding when they get hit.
Can I do this in racing drone motors
I don't see why not.
unbalanced motors are a much bigger deal with quads imo, vibration can cook your escs (gyro noise)
I think people are over-thinking the additional weight. The motor weighed 329 grams before adding epoxy and 333 afterwards. So I'm adding 4 grams to a 300+ gram motor, or adding 1.2% extra. I doubt that's enough to make it off-balance, but I could be wrong.
jamble7k I don't think it matters but a lot because I just got some unbalanced motors from bangood and those are like so much wobbly and I didn't cook any esc ,and my doubt we can just apply it for stator
I saw some new motors with glue or something in them and they looked kind of like these
First mix A+B and then mix the spheres (filler).
jimbit22 There's always that one guy.... congratulations. ..
Yeah, there always seems to be.. If you had the same failures with the resin not curing as i have had, you would be commenting the same..
@@daveanderson2316 and you were that guy. Congratulations.
18:16 did I hear Icky Mouse?
my motor is not separating
Don't use OutRunner motors for robot wars! use in runners.. .
hahaha. why?!
OK something is off with utube or my account.....this video says I disliked it and that is not true ....I only liked it ...I love Team Rob (COPPERHEAD)...I REALLY DONT KNOW ....I'm sorry
could i use cocaine instead of glass microspheres?
How to make combat robot
You gotta work on not saying "umm" 50 times a sentence.
um, yeah, I'll try. ;-)
does this only work on outrunner motors?
It's less of a concern for inrunners since the magnets aren't on the outside and susceptible to damage.
@@RobertCowanDIY thank you. Just ordered parts to make my first bot. Trying to learn as much as fast as possible. Your videos are amazing.