dji motor shafts

[kloner]

I had a bit of an incident that am pretty sure just slightly bent the shafts in my 3s flamewheel kit with the black/red dji motors. already replaced the problem motors, but looking at the 2 i pulled off one just needs a shaft. hate to throw away $40 over a $5 part, do they make em or will another brand work? Found the scorpion selection and it seems to have ground down ends to 1/4" for output shaft pinions...... loos like i'm needing 4mmx34mm with a circle clip on one end, the flat on the other end could handle myself if i got that far...... length for that matter doesn't matter as long as it's long enough. would also like to see if i can get the rest of the motors spinning any smoother

on a side note, one of the bells magnet placement caught my eye, 6 of the magnets aren't consistently spaced as all the rest of the magnets, is that a quality control thing or no big deal? noticed these motors out of the box aren't the straightest spinning motors, at an idle you touch a fingernail to em and 1 is smooth as butter, the other 3 that came with it and the 2 i replaced all have an out of round feel. is that usually the shaft or the bell? on the motors that were really bad, i rotated the shafts inside the bell and got a better smoother feel. do guys break out dial indicators to make that as good as possible? doesn't that sound like bent shafts?

Got it filming really clear, just would like to get it as perfect as possible. Doing fpv and the last thing i want is it to change when shes gone doin her thing.

 

[RTRyder]

I had a bit of an incident that am pretty sure just slightly bent the shafts in my 3s flamewheel kit with the black/red dji motors. already replaced the problem motors, but looking at the 2 i pulled off one just needs a shaft. hate to throw away $40 over a $5 part, do they make em or will another brand work? Found the scorpion selection and it seems to have ground down ends to 1/4" for output shaft pinions...... loos like i'm needing 4mmx34mm with a circle clip on one end, the flat on the other end could handle myself if i got that far...... length for that matter doesn't matter as long as it's long enough. would also like to see if i can get the rest of the motors spinning any smoother

on a side note, one of the bells magnet placement caught my eye, 6 of the magnets aren't consistently spaced as all the rest of the magnets, is that a quality control thing or no big deal? noticed these motors out of the box aren't the straightest spinning motors, at an idle you touch a fingernail to em and 1 is smooth as butter, the other 3 that came with it and the 2 i replaced all have an out of round feel. is that usually the shaft or the bell? on the motors that were really bad, i rotated the shafts inside the bell and got a better smoother feel. do guys break out dial indicators to make that as good as possible? doesn't that sound like bent shafts?

Got it filming really clear, just would like to get it as perfect as possible. Doing fpv and the last thing i want is it to change when shes gone doin her thing.

I think if you were to chuck the motor bells in a lathe with a dial indicator and start doing some measurements you would find variation across all of them, these are not precision manufactured pieces, for that you need to spend a LOT more $ for good motors. As components in an entry level, easy to assemble kit they're perfectly adequate, just don't expect more than they can deliver and they'll get the job done.

Yes, variations in magnet spacing is a quality control/manufacturing issue and just helps prove the point that these are not super high quality parts. Given that a lot of these kits will wind up in the hands of people with little or no flight experience I think the life expectancy of a lot of the parts is intentionally on the low side and the quality reflects that.

Any shaft with the correct dimensions or longer will work as a replacement, lack of a circlip groove isn't that big of a problem. If you have a steady hand and a Dremel tool you can cut the groove yourself using a cutoff wheel. Better still, put them in a metal lathe and cut it that way if you have access to one or a friend that is a machinist, also the best way to shorten the shafts when necessary.

On my F450 kit I found the best way to get smoother flight is to bin the props that come in the kit and put on a set of Graupner 10 x 5 e-props. 10 inch is actaully a bit bigger than the weight of the finsihed kit needs but at the time it was all I had on hand that would fit in place of the originals. I have a set of 8 and 9 inch Graupners on the way to try out on the F450, I think the smaller props will get the last little bits of wobble out of it and produce really smooth and steady flight.

Ken

 

[kloner]

any hints to manufactures of motors that offer shafts a similar size?

 

[kloner]

Lets try this angle,,,,, what is a high quality motor brand that'd fall into the 2215 ish 900kv category?

 

[RTRyder]

any hints to manufactures of motors that offer shafts a similar size?

I don't have any links to anyplace that sells replacement shafts, mainly because it's not something I've needed much in the past, I've either used a shaft from a dead motor in the parts bin or in the case of some of the really cheap motors I use, I just toss it and install a new one. As long as the shaft diameter is the same and the length is the same or longer it can be made to work, as to where to find them, the only advice I can offer is use Google search and see what it turns up.

Lets try this angle,,,,, what is a high quality motor brand that'd fall into the 2215 ish 900kv category?

The high quality part pretty much elimnates a large percentage of anything made in China. When I think of high quality motors I usually look at AXI but they may be a bit more expensive than what you had in mind. I have had good luck with these though... http://www.kkmulticopter.kr/index.h...pter&sc_selected=Motor&sn=flycam_925&id_no=45 I've got a set that have been in continuous use for over a year and a half with no problems at all. They're rebranded Suppo motors which I also have a set of and both work equally well.

Ken

 

[DucktileMedia]

As I spin all my DJI motors around by hand I can feel and hear very different sounds. One sounds mechanically obstructed and the other smooth, one whines and the other is in between. Hmmm, seems just like my Xaircraft experience. I will say that when I got my avrotos, I was thrilled to see they were all identical and felt exactly the same, the bell housings were the same clearances. BIG difference from one Chinese manufacturer to another.

 

[kloner]

I think i run one of those suppro's on my telink foamie, same color/look. I'm gonna cut my losses and try a set of the suppros.... found em at some place called lukes rc planes for $15 a piece, sound right?

What sucks is when i first put it together, i had a killer set of motors, then as replaced em, they all came as crap. Found that rotating the bell on the shafts rounded up a few bells better than they were, but had to cut new flats on the shafts. bearings have been a chore too, ordered some from boca, grade7 stainless and that took care of a couple notchy bearings that came that way

Last night i got in my 9x5x3 blades,,,,, sucked on 3s, but 4s i got a different report, that keeps the motors out of vibes through all forward and decending flight that wasn't working 3s and apc 10x4.7....... It works, but i'm thinking for the price of the suppros, can replace 3 for the price of one dji motor

Thanks for all the advice

 

[kloner]

i finally got all my motors smooth, getting the best bearing on the bottom got the final shakes out,,,, but i still wanna try something else.

i have a hero2, eagle tree logger and OSD pro with gps and plan flying 4000-5000 mah batteries to go somewhere fpv. if i wanted to stick with 4s and smaller props, would i want this one http://www.lukesrcplanes.com/product/suppo-2217-09 or this one http://www.lukesrcplanes.com/product/suppo-2212-15 or am i better off going back to 3s and upping the kv to run the smaller props, like this one http://www.lukesrcplanes.com/product/suppo-2217-07

looking at the outputs, i'm guessing i want the 2217? if not, smack me in the right direction. I like the way weight feels on it, has much more pronounced decent that seems to hold steadier

 

[rwilabee]

Ken where did you find your Graupner props.

Rich

I think if you were to chuck the motor bells in a lathe with a dial indicator and start doing some measurements you would find variation across all of them, these are not precision manufactured pieces, for that you need to spend a LOT more $ for good motors. As components in an entry level, easy to assemble kit they're perfectly adequate, just don't expect more than they can deliver and they'll get the job done.

Yes, variations in magnet spacing is a quality control/manufacturing issue and just helps prove the point that these are not super high quality parts. Given that a lot of these kits will wind up in the hands of people with little or no flight experience I think the life expectancy of a lot of the parts is intentionally on the low side and the quality reflects that.

Any shaft with the correct dimensions or longer will work as a replacement, lack of a circlip groove isn't that big of a problem. If you have a steady hand and a Dremel tool you can cut the groove yourself using a cutoff wheel. Better still, put them in a metal lathe and cut it that way if you have access to one or a friend that is a machinist, also the best way to shorten the shafts when necessary.

On my F450 kit I found the best way to get smoother flight is to bin the props that come in the kit and put on a set of Graupner 10 x 5 e-props. 10 inch is actaully a bit bigger than the weight of the finsihed kit needs but at the time it was all I had on hand that would fit in place of the originals. I have a set of 8 and 9 inch Graupners on the way to try out on the F450, I think the smaller props will get the last little bits of wobble out of it and produce really smooth and steady flight.

Ken

 

[RTRyder]

i finally got all my motors smooth, getting the best bearing on the bottom got the final shakes out,,,, but i still wanna try something else.

i have a hero2, eagle tree logger and OSD pro with gps and plan flying 4000-5000 mah batteries to go somewhere fpv. if i wanted to stick with 4s and smaller props, would i want this one http://www.lukesrcplanes.com/product/suppo-2217-09 or this one http://www.lukesrcplanes.com/product/suppo-2212-15 or am i better off going back to 3s and upping the kv to run the smaller props, like this one http://www.lukesrcplanes.com/product/suppo-2217-07
looking at the outputs, i'm guessing i want the 2217? if not, smack me in the right direction. I like the way weight feels on it, has much more pronounced decent that seems to hold steadier

These are the ones I use, I've flown them on 3 and 4S http://www.lukesrcplanes.com/product/suppo-2212-15. I currently have a set that have seen a lot of use and abuse on my APV quad, RTF weight is right around 1 kilo carrying a pair of 2S 5000 in series and a GoPro in the Coptersky mount, seems just about perfect for power and flight time. The same motors on a lighter quad does extremely well on 3S 2650 packs, it's a good all around motor for a good price.

Ken where did you find your Graupner props.

Rich

I usually get them from electricwingman.com in the UK, I've found the best stock and best prices there. Also the place to buy AXI motors, I got the set of six that are currently on my CS6 delivered for about $75 less than I could have gotten them in the US, and they came with the prop mounts which is extra $ in the US.

Ken

 

[kloner]

this seems to be as smooth as i can get the dji motors..... overall it aint bad, but not sure how long it'll last. Got a set of motors on order

 

[rwilabee]

Ken...

What brand of motors and ESC's do most of the guys prefer. I keep hearing Maytech and Avroto

Rich

These are the ones I use, I've flown them on 3 and 4S http://www.lukesrcplanes.com/product/suppo-2212-15. I currently have a set that have seen a lot of use and abuse on my APV quad, RTF weight is right around 1 kilo carrying a pair of 2S 5000 in series and a GoPro in the Coptersky mount, seems just about perfect for power and flight time. The same motors on a lighter quad does extremely well on 3S 2650 packs, it's a good all around motor for a good price.



I usually get them from electricwingman.com in the UK, I've found the best stock and best prices there. Also the place to buy AXI motors, I got the set of six that are currently on my CS6 delivered for about $75 less than I could have gotten them in the US, and they came with the prop mounts which is extra $ in the US.

Ken