Author Topic: Inspire clone with original DJI Inspire propulsion setup- DONE - flight tested!  (Read 16706 times)

Offline dave_ande

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Hi Tommy


Have you found must excess play in the arm structure. When I place my "inspire" onto a table it settles a little, it seems that there is some play around the worm screw/brass nut.


Any advise would be greatly appreciated


Regards Stuart

Stuart,

Mine does the same thing. I've been looking for a way  to remove the play.

David

Offline Inspire.clone

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Phew!


That's good to know I'm not alone. I also have been looking for a solution. Even considered having a closer fitted nut made....


Anyone else got a solution?


Stuart

Offline CdRsKuLL

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Hi Stu, Yep I completely agree. I think the actual threaded bar could do with slightly less of a pitch but I couldnt find one anywhere!!  I would really like to redesign that bit but I've get my car to finish over the next 2 months... I did use a standard M8 threaded bar, that didnt sink but took a very long time to fully transform. Something in between would be ideal.
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Offline Inspire.clone

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Hi Stu, Yep I completely agree. I think the actual threaded bar could do with slightly less of a pitch but I couldnt find one anywhere!!  I would really like to redesign that bit but I've get my car to finish over the next 2 months... I did use a standard M8 threaded bar, that didnt sink but took a very long time to fully transform. Something in between would be ideal.


Great idea Steve. I'll start some research for a part with a tighter tolerance

Offline CdRsKuLL

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Yep, its the pitch you need to look at. I think currently its moves around 10mm on one revolution. I think its 5 start / 2mm from memory (2x5 = 10mm), although I have to confess it confuses the hell out of me as some adverts say 2mm / some 10mm .. lol
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Offline Inspire.clone

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Yep, its the pitch you need to look at. I think currently its moves around 10mm on one revolution. I think its 5 start / 2mm from memory (2x5 = 10mm), although I have to confess it confuses the hell out of me as some adverts say 2mm / some 10mm .. lol


Thanks for that Info Steve. It gives me a good starting point. I can understand what you have explained. I also have access to a milling machine. I'm wondering if I could get one milled with a tighter tolerance.


Stuart



Offline rcfiddy1

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Alot of play is in the flex coupler. It acts like a spring. What I did to eliminate some play was insert the threaded rod into the flex coupler and bottom it out as close to servo as possible. than when its inserted thru the frame i checked to see if the flex coupler and first bearing near top of frame had any space between them. I than printed a shim out of nylon to keep the coupler from elongating. It helped a bunch but I can still see some slop in it.

Offline Inspire.clone

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rcfiddy1? If we removed the flex coupler would that also relieve the play? I'm wondering if the alignment really needs a flexi coupler?


Any thoughts ?
« Last Edit: January 19, 2016, 11:13:57 PM by sauntson »

Offline Tommy

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16 amps for hover.
5.2Ah battery onboard

Offline dtowe034

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Tommy,
Where did you place the DJI ESC's? The lower leg housing is too small for the ESC.

Offline Inspire.clone

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Tommy,
Where did you place the DJI ESC's? The lower leg housing is too small for the ESC.


Hi dtowe34


Depending on which ESC's you are using will depend on which motor mounts to be used
The I formation is all included within the build threads and electronic


Hope this helps

Offline rcfiddy1

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rcfiddy1? If we removed the flex coupler would that also relieve the play? I'm wondering if the alignment really needs a flexi coupler?


Any thoughts ?
Yes. It should remove most of the slop. Only issues than would be if the center of the servo is not lined up with center of threaded rod.


Offline Inspire.clone

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rcfiddy1? If we removed the flex coupler would that also relieve the play? I'm wondering if the alignment really needs a flexi coupler?


Any thoughts ?
Yes. It should remove most of the slop. Only issues than would be if the center of the servo is not lined up with center of threaded rod.


Ok I'll give that a try and report back. Found one on thingiverse which could be printed, however the connectors would need their diameters increasing. Have a 6-8mm coupler on order.....


Regards

Offline CdRsKuLL

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Nice idea about the solid coupler .. Might give it a go when I get time to return to the project.
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