Bob Morley
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  • Chile
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Carbon tubes as axial bearing ??

Started Apr 29 0 Replies

Anyone have experience using a carbon tube inside another as a simple axial bearing ?The application is a tricopter tail boom, its a 12mm tube & so must rotate freely with minimal play.I guess a…Continue

 

Bob Morley's Page

Latest Activity

Bob Morley commented on Bob Morley's blog post Tricopter assembly
"The only place I'm blogging is here :-) I might release it into the wild but that depends on how well it flies, I wouldn't want to give you a turkey :-)"
Jun 28
magjogui commented on Bob Morley's blog post Tricopter assembly
"This looks really nice, do you have a blog? or a website were you post the materials ? are you going to release as OpenHardware? I would like to have one for me =) KR"
Jun 28
Bob Morley commented on Bob Morley's blog post Tricopter assembly
"That was the plan but could'nt find any the right size. I decided to get it flying & have some fun, a little silicone grease will just have to do for now."
Jun 27
The Sun commented on Bob Morley's blog post Tricopter assembly
"The tail mechanism is nice, have you thought about using plastic bushings to improve the friction/ wear situation?"
Jun 27
The Sun commented on Bob Morley's blog post Tricopter assembly
"@Bob Morley [Citation Needed]"
Jun 27
Bob Morley posted blog posts
Jun 26
Bob Morley commented on Bob Morley's blog post Tricopter assembly
"I'm using PLA, its not the strongest material but seems adequate. Most sections are 2mm thick, parts which take more load are 3mm. The trick to getting strong parts is thin layers (0.2mm) and print very slowly, the main body section took 13…"
Jun 26
JeanLeFlambeur commented on Bob Morley's blog post Tricopter assembly
"I really like your setup and the yaw mechanism. Are you using PLA or ABS? How is the printer Z-axis oriented? Are you using anything else to strengthen the print? Some post-processing? "
Jun 25
Bob Morley posted a blog post

Printing....

Printing almost complete 13 hours later.Not sure about the 'lurid purple' colour, for some reason it was the only filament left at the shop.This version doesn't have a camera gimbal, I want to see what the all up weight is without any 'extras' and have some fun flying it for a while.See More
Jun 24
Bob Morley posted a blog post

Progress

Getting down to target weight has been challenging.This version is lighter, stronger, and stiffer than its predecessors. Only airtime and hard landings will show if its good enough.I'm printing in PLA with 60% infill, 0.2mm layers and slow print speeds which seems to give the strongest parts.I'll post photos when its assembled.See More
Jun 21
Bob Morley posted a discussion

Carbon tubes as axial bearing ??

Anyone have experience using a carbon tube inside another as a simple axial bearing ?The application is a tricopter tail boom, its a 12mm tube & so must rotate freely with minimal play.I guess a better solution would be a PTFE bush, but not so easy to find/make here in the colonies.See More
Apr 29
Bob Morley posted a blog post

Update

The design is almost complete so thought I would share it.The remaining part is the connection between booms and the chassis, which needs to be strong and provide vibration resistance. All I've come up with so far is a 'rubber grommet sandwich' with M4 bolts/washers etc, seems simple but somehow inadequate.The…See More
Apr 28
Bob Morley posted a blog post

Frame design.

I've been experimenting with frame design, an essential component to keep all the parts flying in formation.I printed some interlocking plastic parts in 2mm PLA & super glued them together to see how rigid/strong the end result.The attached pic shows about half the fuselage section, it weighs 23 grams and seems…See More
Apr 26
Bob Morley commented on Bob Morley's blog post More progress...
"I was just going to superglue everything and see how it went, nice to know which glue to use. I agree PLA is a poor material but it has benefits - its cheap, easy to make accurate prints and can be used by every 3D printer. If it works out I may…"
Apr 21

MR60
Hugues commented on Bob Morley's blog post More progress...
"Nice project. If I can throw some experience on building frames : they must be as rigid as possible in order to have a good attitude control. CF tubes are rigid, no problem. But PLA plastic parts are linking and holding your CF tubes and that is not…"
Apr 21
Bob Morley commented on Bob Morley's blog post More progress...
"I agree completely regarding tricopter tail linkages, a vulnerable part that's tough to simplify, all part of the challenge. I have some ideas but ran out of space for the servo, it may yet happen as I'm still working on the CAD…"
Apr 20

Profile Information

About Me:
Brit living in Chile.
Please tell us a bit about your UAV interest
Building a 700 gram tricopter
Hometown:
Santiago

Bob Morley's Blog

Tricopter tail boom linkage

Posted on June 26, 2017 at 10:41am 0 Comments

Here's a better photo showing the tail boom linkage - basically a pair of printed gears.

This design has fewer parts than a conventional linkage, less things to break so hopefully more reliable.

There's a 2:1 gearing ratio between the servo and the tail boom. The servo moves +/- 60…

Continue

Tricopter assembly

Posted on June 25, 2017 at 12:25pm 7 Comments

Dry assembly to make sure all parts fit, so far so good.

The distance between motors is 450mm so obviously the arms need to be cut down.

A PixFalcon goes on top, the GPS/Compass module will either go directly on top of the PixFalcon or have its own mount at the front of the drone.

Target weight…

Continue

Printing....

Posted on June 24, 2017 at 8:44am 0 Comments

Printing almost complete 13 hours later.

Not sure about the 'lurid purple' colour, for some reason it was the only filament left at the shop.

This version doesn't have a camera gimbal, I want to see what the all up weight is without any 'extras' and have some fun flying it…

Continue

Progress

Posted on June 21, 2017 at 11:14am 0 Comments

Getting down to target weight has been challenging.

This version is lighter, stronger, and stiffer than its predecessors. Only airtime and hard landings will show if its good enough.

I'm printing in PLA with 60% infill, 0.2mm layers and slow print speeds which seems to give the strongest parts.

I'll post photos when its…

Continue

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