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openDog V3 update (Patreon)

Published:
2021-09-03 10:39:15
Imported:
2026-06
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Content

Here's a little preview of the openDog V3 progress for Patrons. I've almost got eight of the twelve axis together. The last four drives have belt drives to the knee and the upper & lower legs need building out. I'm pretty happy with the progress so far.

Files

Previews only

Comments

Andy Ihnatko

It must be tough to get parts printed in time for weekly videos. How many printers do you have going at once?

Scott Cress

The mock up leg was pretty big. How tall is this version? Comes up to your hip?

David L Brenner

Did you scale the motors at all for different axis? It seems you wouldn’t have the same torque and stress needs for each

Anonymous

Cool! Cant wait to see more.

XRobots
>>67109358

It's the same size as openDog V2 at the moment - about 400mm long legs. I have carbon fibre tubes in the lower leg so they could be extended later.

XRobots
>>67109592

No, they are all just 10:1, I considered it but generally the ones that have higher torque requirements need to go faster to achieve the inverse-kinematic movements, so I just made them all the same.

Thomas Coley

Looks wicked. It's looking like a really well developed bit of kit.

Shadow

Very cool. Will there be a side-by-side comparison demo of the two different drive components in the next video?

Doug Cooper

are you saving much weight with the carbon fibre tubes? I am interested to see what the torque to weight ratio is!

XRobots
>>67128192

ItsIt'be mentioned in the video, but the new one doesn't get powered up just yet

XRobots
>>67144528

There's probably not that much of an advantage overall, but they are very rigid and they look good.

Andy Ihnatko
>>67107738

Some day I'd be interested to see how you manage and track multiple projects at once. If one of my repair or build projects gets interrupted for more than a few days, I need to package everything up meticulously, and leave myself plenty of notes. It's not like you'd make the mistake of installing the code for your Hat With Embedded Autonomous Donut Delivery Drone into openDog. But I imagine that without a traffic system or something in place, it'd be easy to design Version 9 of a shoulder part, and then print multiple copies of Version 8 by mistake four days later.

XRobots
>>67107738

I do a lot if forward planning and testing, and often multiple iterations of printed parts before it's totally right. Delete all the old files! But yeah I do often print the wrong files, but not four times usually :-)