I'm a big fan and supporter of open source multirotors but this is just too impressive to pass. Too bad it is super expensive and out of reach for most hobbyists. Just wanted to share this with the community and see what they have to say about the the frame, gimbal and about DJI in general.
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jonathan,no,i did not make cinestar clone..but i do have some sugestions if you go that way..first you should use tubes of 20mm OD,it is easer to find them than 25mm OD,be cearful with tubes from China i strongly sugest to find some German or EU shop to buy what you pay for..like this one
http://www.x-hz.com/index.php?page=product&info=1120
clamps are also more common in 20mm like this one
http://www.beedrones.com/products
orginal cinestar use to have savox servos but they are diferent now...this is savox servos http://www.savoxusa.com/Savox_SC1258TG_Digital_Servo_p/savsc1258tg.htm
http://www.savoxusa.com/Savox_SH1290MG_Digital_Servo_p/savsh1290mg.htm
for gears and how to calculate them go here
http://www.sdp-si.com/eStore/CoverPg/Drive_Components.htm
potentiometars
http://www.1001copters.com/lang-en/stabilised-camera-mount/59-enhan...
...so here you have all the elements,you can try,but it will never be as good as original and also you will spend around $5oo - $8oo....
Not sure about the time frame, but looks like I will get access to a S800 + Z15 gimbal system. I'll take some detailed pictures of the design when I do.
Emin: .90 helicopter tail boom (25mm) http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...
The irony is that those $2.99 metal booms are much better then "fake" $30 carbon fiber ones.
...if the Z15 cost 300 instead of 3000$ it would be perfect...
John can you please post link of those aluminium tubes..also do we need "proper" CF tubes wich are 100$ for 1m or we can use something cheeaper..i had carbon hexa from t-rex 550,600,700 boom tubes from HK,pure shit,now i am stucked with 21.5mm OD clamps and it is almost impossible to find proper CF tubes of that dimension,any sugestion?
Martin: If the Z15 could hold a bigger camera (it is currently built around the Sony NEX 5/7 cameras), it would be perfect.
Emin: I am not talking about the type of alu. tubes you typically find in a hardware store, but high grade thin walled tubes used in R/C helicopters. I have a bunch of .90 size helicopter boom tubes from HobbyKing costing $2.99. They have a 25mm outer diameter and is 830mm long. Weight is 105grams. Plenty strong, and very rigid. Compared to the price of proper 3K carbon tubes they are practically free. I am willing to add a little weight, at least for the first prototypes.
Since so many people here are saying great stuff about the cinestar design I think I'm gonna give it a shot too.. guess the carbon fiber / glass fiber tubes available here would do:
http://www.goodluckbuy.com/hobbies-and-toys/carbon-glass-fiber.html
The clamps and belt dive wheels etc. can even be 3d printed..
..John Arne,Jani...with aluminium tube there is no way to make cinestar style gimbal under 500gr,carbon fiber mold is the only way to achive that weight..Hero gimbal is 760gr,cinestar 3x with lending legs is more than 1000gr,AV200 800gr...
Yeah Leif is not a good example for FTV/Video stuff. He is more than PRO on that area. Also he has paid rather huge cost while learning his skills. If I remember correctly he has lost around 10 planes in Norwegian wilderness/mountains and several hexa/octo copters. But yeah it's great to look his fast speed flying on sawmill and other locations :)
Making basic gimbal is rather "easy" but to make it vibrationless will be another thing. We know, we have already made over 25 different variations and test gimbals and still not happy on their results. Most of the commercial gimbals have special oil cylinders/suspension gearboxes to reduce vibrations and those are rather expensive.
Also many of those gimbals needs plastic/aluminum blocks to mount bearings etc. Trust me, they are not cheap to make.. I know.
But yes we can reduce prices some level from full commercial products and if design will be good enough, who knows we might even make moulds for most of their parts and after that price will be really tempting.
Should we use motors/servos or steppers. All of those are possible to use. We already have some miniature steppers that can be used and then as I have direct contacts to many servo companies, we can get custom made servos for gimbal needs.
And about weight, well it has to be way less than 500gr. I would say that gimbal itself cannot weight more than 300gr or you will waste a lot of flyingtime/payload to just carry gimbal.
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