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Cycloidal V3 / openDog V3 (Patreon)

Published:
2021-07-19 07:56:44
Imported:
2026-06
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Content

Here's next week's video, early for Patrons. This one goes out publicly on Tues 27th.

This is a slight progression on my Cycloidal drive development and a look at what an openDog V3 leg would partially look like. In reality there are still a few minor changes required to both, but it looks like it's a good strategy.

Files

Previews only

Cycloidal Drive V3 - PREVIEW VERSION

It's time for another Cycloidal Drive reducer, this time with correctly shaped Cycloidal discs. I'm using nylon bushings this time to try to reduce weight and cost, but will it work out how I expect for this version of the Cycloidal Drive? You can support me on Patreon or buy my Merchandise: *************************** Patreon: https://www.patreon.com/xrobots Merchandise: https://teespring.com/stores/james-bruton *************************** Affiliate links - I will get some money of you use them to sign up or buy something: *************************** Matterhackers 3D printing supplies: http://www.matterhackers.com?aff=7500 Music for your YouTube videos: http://share.epidemicsound.com/xrobots *************************** Other socials: *************************** Instagram: https://www.instagram.com/xrobotsuk Facebook: https://www.facebook.com/xrobotsuk/ Twitter: https://twitter.com/xrobotsuk *************************** CAD and Code for my projects: https://github.com/XRobots Huge thanks to my Patrons, without whom my standard of living would drastically decline. Like, inside out-Farm Foods bag decline. Plus a very special shoutout to Lulzbot, Inc who keep me in LulzBot 3D printers and support me via Patreon. HARDWARE/SOFTWARE Below you can also find a lot of the typical tools, equipment and supplies used in my projects: Filament from: https://www.3dfuel.com/ Lulzbot 3D Printers: http://bit.ly/2Sj6nil Lincoln Electric Welder: https://bit.ly/2Rqhqos CNC Router: https://bit.ly/2QdsNjt Ryobi Tools: http://bit.ly/2RhArcD Axminster Micro Lathe: http://bit.ly/2Sj6eeN 3D Printer Filament: http://bit.ly/2PdcdUu Soldering Iron: http://bit.ly/2DrNWDR Vectric CNC Software: http://bit.ly/2zxpZqv Why not join my community, who are mostly made up of actual geniuses. There’s a Facebook group and everything: https://www.facebook.com/groups/287089964833488/ XROBOTS Former toy designer, current YouTube maker and general robotics, electrical and mechanical engineer, I’m a fan of doing it yourself and innovation by trial and error. My channel is where I share some of my useful and not-so-useful inventions, designs and maker advice. Iron Man is my go-to cosplay, and 3D printing can solve most issues - broken bolts, missing parts, world hunger, you name it. XRobots is the community around my content where you can get in touch, share tips and advice, and more build FAQs, schematics and designs are also available.

Comments

Anonymous

It’s good to realize how little I do with my printer. 😬

XRobots
>>64050170

Well it's just another tool - I have multiple socket and spanner sets I barely touch ;-)

Anonymous

Do you have a general formula you use to get the diameter correct on circles for fitting into the bearings? It’s usually about 4 mm over or under correct because the printer does not do circles correctly

XRobots
>>64050755

They usually come out smaller, but only by about 0.2mm - I guess it depends on how big the hole is but 4mm sounds excessive.

Scott Cress

What's your largest print volume?

XRobots
>>64053605

All the printers are TAZ Workhorses, so 280 mm x 280 mm x 285 mm (11.02 in x 11.02 in x 11.22 in). Pretty sure I've pushed a little past that footprint occasionally though as the bed is slightly bigger.

Scott Cress
>>64053605

Is it's size adequate for all the work you do? Would having a larger print volume be useful?

XRobots
>>64053605

It's good so far. I have made things in multiple parts in the past though.

Adam Green

I am excited to see your OpenDog v3 progress. I really enjoyed watching your v1 and v2 videos.

Adam Green
>>64050170

I bought my 3D printer after seeing all of the cool robot related stuff you could make with yours. I now use it often in my own robot projects and they have definitely improved from its use.

Andy Ihnatko

Not many YouTube creators announce that they're pivoting away from building recreations of famous robots from movies with huge built-in fanbases to something as esoteric as their personal enthusiasm for experimenting with and developing walking robots. This video on a new shoulder/elbow drive design was way more interesting than, say, YouTube's n-th Mandalorian or WandaVision-inspired project would have been. Stay on course! This is all great stuff!

XRobots
>>64093588

Hopefully this is solves all my mechanical issues, so it'll be a good robot to continue development with.

XRobots
>>64102731

Thanks Andy - I've come to realise that views on the video don't necessarily reflect how much main stream interest there is in the topic because YouTube has such a large amount of & diverse viewers. There are many other factors that influence how well the videos do so I'm just doing what I enjoy as much as possible. I'm not saying I'll never build another Star Wars Droid though ;-)

Anonymous

Looking better every time, can't wait to get a buildable OpenDog! Thanks much!

XRobots
>>64129414

Hopefully it's getting close to something I can use for ongoing development. It feels pretty solid.

Andrew .

Re: spacers - you could also switch the type of bearing, needle roller bearings are a lot lighter than ball bearings given the same maximum radial force.

XRobots
>>64134818

I just managed to buy 400 standard bearings the right size for about $80. They are pretty light weight anyway and really commonly available.

Anonymous

8308 are the dimensions of the stator.

Andrew .
>>64134818

Ah that works too! Rewatching the video I wonder about those outer bearings rotating at all, actually; based on what I've heard, with a proper cycloid shouldn't they be stationary? Maybe the change in that shape is what's leading to a different sound. And/or, pausing the video it doesn't actually seem to contact all of the spacers, so maybe some fit/tolerances could be adjusted...

XRobots
>>64151854

That makes sense. It took ages to find them though because 9225 doesn't show up on any searches!

XRobots
>>64134818

I had to tolerance the disc down a bit to get it to work at all. If the disc is touching all the pegs as it moves then I'm pretty sure it can't just roll over them like gear teeth - especially the 'peak' of the cycloidal disc as it passes the peg while it's engaged with the teeth on the other side. I'm pretty sure the sound is down to the nylon bushings being slightly lose on the pins so it makes that sort of clattering sound.

Neil Devonshire

Hi James, it's nice to see OpenDog V3 taking shape, it's annoying when they stop making motors that you already have, hope the new ones are reliable. Have fun

XRobots
>>64185589

They seem ok, I've just ordered a bunch more, so let's hope they work in the long term.

Brachiopod

James can you share where you ordered those bldc from? Also, is python knowledge a must to work with Odrive? The starter guide is still confusing to me. Also looking at simpleFOC shield and gimbal motors to get started with brushless.

David Lang
>>64134818

I haven't looked at exactly what your dimensions are, but try to take advantage of the fact that skates have a standard bearing that is mass produced in an incredible variety of options and is much cheaper than bearings of slightly different sizes (skate bearings are 8mm x 22mm 7mm thick)

XRobots
>>64134818

I think that would make it quite a lot heavier. I found the smaller ones cheaply on Aliexpress.

Anonymous

Hi James. I’m trying to build this drive. Do you have a part list? And how do you split the STL in all the components that need 3D printed? Thanks!

XRobots
>>69252917

Hi Cristian, The STP/STEP file is the whole assembly so you need to load it into some CAD software (like Fusion 360) and then you'll be able to export all the parts as STL from there. All the bearings etc are shown in that assembly so you'll be able to see what the sizes are. Let me know if you need any more pointers.

Anonymous

Thank you James!