Carbon Fibre Brushless Gimbal for Sony NEX and smaller.

Full CF gimbal with no bolts apart from fixing to the motors. CF pegs are used to secure the gimbal parts together. A small drop of hot glue under each peg s...

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MR60
Comment by Hugues on June 23, 2013 at 2:39pm

Nice gimbal. Where did you buy it ? Did you build it ? Does it work with a Sony NEX7 for example ?

Comment by John Grouse on June 24, 2013 at 2:12am

Designed and built by myself - please check out my blog -http://www.diydrones.com/profiles/blogs/carbon-fibre-brushless-gimb....  

The width of the platform caters to the Sony NEX5N/R with about 8mm spare each side so unless the NEX7 is substantially larger it should work.  If not I will change the design (sooner rather than later as I have to place the order to mass produce these in the next week).  Any chance you could measure the outer dimentions of the NEX7 you have and post your findings on my blog?  Thanks!

Comment by John Grouse on June 24, 2013 at 2:19am

Looking at selling just the CF parts / fixtures / bearing / vertical rods for $90USD and complete kits with Martinez controller and motors for $260USD.  That will include pre-configured settings on the controller so you just need to find the balance point for the camera you attach to the platform and you are good to go.  Note that this is a 2-axis gimbal, not a three axis so yaw on the camera shots is via a yaw on the multicopter.  For simplicity sake it might also make sense to use the landing skids like these ones on eBay - http://www.ebay.com.au/itm/Universal-Tall-Landing-Skid-Gear-Stand-K... as this gimbal is designed to fit directly onto it.  Other vibration dampening designs are on the cards.


MR60
Comment by Hugues on June 24, 2013 at 10:23am

Thx for answers, I'm interested. A few more questions:

-What is the diameter of the CF tubes on which you attach the gimbal ? (i already have a 12mm tube system that I could reuse eventually). What is the distance between these two tubes ?

-Does the gimbal allows enough pitch movement to make the camera face downward ?

-Would that gimbal be compatible with the Alexmos controller rather than the Martinez ? (question of size and scew holes on the gimbal ?)

-What motors do you recommend to be strong enough to move a Nex5/7 ?

-Is the gimbal adjustable on three axis to tune the center of gravity ? (righ/left, front/back, Up/down)

Comment by John Grouse on June 24, 2013 at 5:47pm

The CF tubes at the top are 12mm and the spacing between them is 57mm (center to center).

Yes, the pitch can actually move a full 360 however the limitation is the gyro/acc module's cable the feeds off the base platform - it can only stretch enough so that the pitch is directly up.  Pitching down you can easily go -120 if need be.  I think that is partially why the Zenmuse cost so much - all the circuitry feeds through wipe pads within the motors eliminating the need for cables.  Although if you need a live video link off the camera you still need a cable hanging off the pitch assembly.

I believe the Alexmos controller also uses the 45mm corner hole spacing so the mount points will be the same for both.  I have not used the Alexmos yet, but from what I have read you can get better results with it (if you are willing to pay $80 more that is).

I've tested the FD-Power 4008 motors and they hold something as heavy as 200-300g no problems at all (tested a 300g tape player on it to see what they could handle without oscillating).  Others that would work - RCTimer's 5010, BGM4108-130 from dys.hk, GMB4008 sold under a few brand names.  Probably some others that claim to handle NEX camera weights on the web.

The gimbal is adjustable left/right for the roll balance and the pitch balance is set by moving the camera forwards or backwards on the slotted base.  The 1/4" slots on the base allow for a reasonable range of movement to find the sweet spot.  Once that is found you can raise the camera if needed using washers so that the pitch assembly is not bottom heavy, although the axis is almost directly through the center of the NEX lens already.  For the larger NEX lens you would move the camera backwards to compensate.  I've also read about an adaptor for the NEX that allows remote control of the zoom and recording functions via a couple of spare channels.  Probably need the PowerZoom lens for that.   

Hope that answers your questions?  

Comment by John Grouse on June 24, 2013 at 11:20pm

Managed to find an accurate model of the NEX-7 to test in the 3D model.  1.5mm clearance each side of the camera.  The metal neck strap loops also clear the side arches.


MR60
Comment by Hugues on June 25, 2013 at 10:33am

I have a rail mount system consisting of two parallel 12mm CF tubes, however they are spaced center-to-center with 15,75 cm. Or I also have the possibility to attach it on my bottom dampened carbon plate which has various M3 holes. Would you be able to replace your current tube mount with a CF plate that would allow me to screw it on my frame with M3 screws ?

Comment by John Grouse on June 27, 2013 at 3:28pm

Hi Hugues,

if you send the mm dimensions of the dampened CF plate I can come up with something that attaches to a horizontal surface, but still works with the two vertical bars on my design.  If the surface is already dampened then I'll leave out any dampening on the connection point (too much dampening can make the assembly wobble around).

Thanks,

John.

PS - I'm working on a new e-commerce web site right now so I'll let you know when that is live.

Comment by Karl Truemann on November 29, 2014 at 1:29am

Hello John,

Want to ask you if you could share the Nex7 CAD file with me to permit check the integration on my drone.

Thank you very much,

Karl

Comment by John Grouse on November 30, 2014 at 7:07pm

Hi Karl,

Been I while since I used that CAD file.  I'll see if I can find the 3DS file again on my system.  Fairly sure it was a free file download when I found it on the net.  Once I get it up on my Box.com account I'll send you a link.

Regards,

John

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