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Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Thu May 12, 2022 1:06 pm
by Sam_uk
Nice, I love it
I can't seem to get images working here, but I added some here:
https://github.com/rosmo-robot/Rosmo_3D ... /Readme.md
At first glance, the only part I think might need attention is the motor/encoder holders. I love the concept of what you've done, but it's unclear how the encoder board would be added/held in place?
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Thu May 12, 2022 1:51 pm
by Bance
Couldn't find any details of encoder, so made pocket the same as the example given, it's in the Motor bracket.
Does need a channel for wires, would need to know direction?
For images just drag and drop into text entry box.
- ENC.png (37.73 KiB) Viewed 1707 times
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Thu May 12, 2022 3:59 pm
by Sam_uk
Nice
The issue is that the encoder pocket needs to be _opposite_ the motor, on the same side as your mounting flange. We could cut the centre of the flange away I guess? Just need to make sure there is enough material to be structurally sound.
I think it could work if we lengthen the 'flanges' (is that what they're called?) between the motor mounts.This part:
Lengthening them would make space for the encoders, we could then cut away enough of the 'flange' to make room for the encoder.
A nice side benefit of doing this would be that the central pin:
would be wider and stronger too.
As we haven't done the wheels yet, maybe we can accommodate the extra width there? By just putting the motor further into the wheel?
These are the encoders:
https://github.com/rosmo-robot/Magnetic ... SPI#readme
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Thu May 12, 2022 6:18 pm
by Bance
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Fri May 13, 2022 5:04 pm
by Sam_uk
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Fri May 13, 2022 5:16 pm
by Kunda1
(You need to link directly to the image)
Code: Select all
https://raw.githubusercontent.com/rosmo-robot/Rosmo_3D/main/V2/images/encoder.jpeg
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Fri May 13, 2022 10:44 pm
by freedman
Just a thought about tracks; they are very inefficient for turning. How about making the idler/drive wheels with a couple grooves and use o-rings. Not sure what the environmental requirements are for the device, cat hair could be problem
.
The o-rings placed around each wheel might also give a measure of traction from drive to track if that is a problem.
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Sat May 14, 2022 6:58 am
by Bance
I'll need to see if I can get both encoders to be the same way up (for easier wiring,) but it's a start.....
I made it in two pieces for easier printing.The encoder board needs to be drilled?
- rob.png (158.95 KiB) Viewed 1493 times
https://www.dropbox.com/s/0nn6jsv5yfklb ... FCStd?dl=0
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Sat May 14, 2022 9:32 am
by Sam_uk
Looking great!
The encoders come with the mounting holes, they don't need drilling
What's the best way to explode a model in FreeCAD? I've installed
https://github.com/JMG1/ExplodedAssembly but can't work out how to use it.
Re: Open Hardware robot - Rosmo - Looking for volunteer(s)
Posted: Sat May 14, 2022 12:45 pm
by Bance
Sam_uk wrote: ↑Sat May 14, 2022 9:32 amThe encoders come with the mounting holes
But they don't align with anything useful.
Sam_uk wrote: ↑Sat May 14, 2022 9:32 amWhat's the best way to explode a model in FreeCAD?
For checking parts is probably best to make everything invisible, then go back select the item for inspection and make it visible (Space-Bar)
