Test run using bamboo skewers to hold the retracts aligned in place

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I've been working on this and decided I need to find someone to produce the main plate for mounting of the gimbal and servos, or at least a render file for me to find a fabricator at a reduced price

Unless I can arrange a group order for plates somehow

 

The design is quite simple and parts are easily found to build one, besides the mounting plate itself

 

It requires: 

2 - Retract servos http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...

2 - Coax Connectors http://www.ebay.ca/itm/151079759256

2 - Coax Couplers http://www.ebay.ca/itm/321206494080

2 - 4mm diameter nails

2 - 12mm OD x 10mm ID 200mm Long Tubing http://www.ebay.com/itm/111176377084

Epoxy & CA Glue

 

Tools required involve Something to cut the nail & Tubing to the needed lengths

A hot air gun or something to heat the coupler to melt the inside and remove the centre pin Maybe a hammer or vice, A hacksaw

I started by heating & removing the centre from the couplers and inserted the nail while the coupler was still pliable inside

measured the needed nail after the coupler to replace the stock retract pins and cut the extra off

Made a notch in the nail shaft to match the set screws on the retracts

the tubes only involved epoxying the coax connectors in one end and cutting to the desired lengths

shaping the leg end to join the foot tube to provide a uniform joint with the curve of the foot tube

 

I used some spare aluminum tail tubes like these as my gear and epoxied them together to form the "T"

26" Double Horse Helicopter Tail Booms http://www.ebay.ca/itm/321102071864

 

The gimbal I'm using and designed the mounting holes from:

Gimbal Mount http://www.ebay.com/itm/171136254422

Gimbal Motors http://www.ebay.com/itm/121185850081

my idea is to make the top plate rubber anti vibe mount holes in the finished retract and gimbal plate thus the need for the top plate on the original gimbal mount will be omitted and the rubbers would be attached to the new plate instead

 

 

Views: 2984

Comment by Charles lakins on December 21, 2013 at 8:12pm

If someone can produce a file for cnc or a laser cutter for the plate, I think I can find someone to produce the plates at a decent price ,I'm thinking G10 or 1.5mm Carbon Fibre instead of 2mm aluminum

Comment by Graham Harding on December 21, 2013 at 11:19pm

Charles, I can CAD it in dwg or dxf format, CNC laser cutters can run them off. You'll need to send me a sketch with all the dimensions and I'll put something together for you, it will not happen over night that's all. Definitely go CF.

Cheers

Comment by Charles lakins on December 22, 2013 at 12:00am

Heres a drawing with the measurements on it, except the servo screw holes are not the best I traced them using the mount as a stencil ..

I only marked the one rubber mount hole to show the location of them (not to scale though) everything else is scale except the one larger screw hole for the servo

Hope that helps some, its not the fanciest

 

message me if you need anything else

Thanks

 

 

Comment by Graham Harding on December 22, 2013 at 1:27am

Need more info, sent message. I work only in metric, imperial is a foreign language.

Comment by Charles lakins on December 22, 2013 at 11:15pm

 

Here's one in metric only

any design incorporating the gimbal in the centre with the retracts at the distance apart here will work

whatever is in between is not really a concern ,I was going to add more holes but didn't want to reduce the strength and provide more for flex in the middle

 

Comment by Daniel Allen on December 23, 2013 at 7:13am

Great work, it looks solid. I've been thinking about using those types of retracts too, since they are cheap and pretty light.

Comment by Charles lakins on December 23, 2013 at 7:27am

Thanks

 I think 7.5lbs too is the rating if I remember right

Comment by Ryan on December 23, 2013 at 6:31pm

Charles/Graham if you want to send me the cad files and material you want cut I would be willing to cut the parts on my cnc router.

Comment by Charles lakins on December 23, 2013 at 7:21pm

Thanks Ryan! when I get the files figured out I'll message you

-Charles

Comment by Graham Harding on December 23, 2013 at 7:48pm

Ryan, either format suit you?

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