Inside-H: Modified H-Bot drive June 03, 2016 12:15PM |
Registered: 10 years ago Posts: 564 |
Re: Inside-H: Modified H-Bot drive June 03, 2016 01:33PM |
Registered: 7 years ago Posts: 78 |
Re: Inside-H: Modified H-Bot drive June 03, 2016 03:23PM |
Registered: 8 years ago Posts: 1,873 |
Re: Inside-H: Modified H-Bot drive June 03, 2016 04:45PM |
Registered: 10 years ago Posts: 564 |
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JamesK
Wow, that's a neat idea. Looks like the twist gets a bit extreme when the carriage is at the ends of the travel - be interesting to see how that wears. Can't quite visualize how the filament feed path will stay clear of the lower guide...
Re: Inside-H: Modified H-Bot drive June 03, 2016 04:52PM |
Registered: 10 years ago Posts: 564 |
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ipcalit
Looks good. However I'm not sure how the central rail and its bearings will handle lateral torsion from the perpendicular moving rail and the hotend/extuder combo being at the extremes. That's why CoreXY implementations have two rails to steady the load. You might get away with a bowden setup and keeping the rails short (400mm you currently have is the max I would go for).
Re: Inside-H: Modified H-Bot drive June 03, 2016 07:33PM |
Registered: 7 years ago Posts: 78 |
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LoboCNC
The filament feedpath is a little trickier. I haven't installed the bowden tube yet, but it will lie in the XY plane above the lower rail. I'll need to make some guides so that the tube will ride up over the rail and not get caught on the end.
Re: Inside-H: Modified H-Bot drive June 03, 2016 07:37PM |
Registered: 8 years ago Posts: 1,873 |
Re: Inside-H: Modified H-Bot drive June 03, 2016 07:38PM |
Registered: 7 years ago Posts: 78 |
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LoboCNC
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ipcalit
Looks good. However I'm not sure how the central rail and its bearings will handle lateral torsion from the perpendicular moving rail and the hotend/extuder combo being at the extremes. That's why CoreXY implementations have two rails to steady the load. You might get away with a bowden setup and keeping the rails short (400mm you currently have is the max I would go for).
The moment rating for the 12mm wide linear guides is 3.7kgf-m. With the bowden extruder I'm using (~100g), the dynamic loading will be a tiny fraction of the rated load.
Re: Inside-H: Modified H-Bot drive June 04, 2016 01:49AM |
Registered: 10 years ago Posts: 564 |
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ipcalit
The rails are 12mm wide but probably 8mm thick and the moving one is like a pair of 20cm ones supported on one end. Any idea how much deflection you get at the end of that rail (I recall some online calculator but can't remember the url)? Do you think vibrations and resonance from say hitting a bump in PLA would have an influence? Just some things to consider.
Re: Inside-H: Modified H-Bot drive June 04, 2016 01:55AM |
Registered: 10 years ago Posts: 564 |
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JamesK
I suspect Lobo is going to design a hotend with the entrance to the melt chamber at 90 degress to the nozzle bore, so the solid filament won't have to negotiate a sharp turn. The seals are a challenge of course.
Re: Inside-H: Modified H-Bot drive June 04, 2016 04:17AM |
Registered: 8 years ago Posts: 5,232 |
Re: Inside-H: Modified H-Bot drive June 04, 2016 10:42AM |
Registered: 10 years ago Posts: 564 |
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o_lampe
Actually you shoud call it i-bot ( Name maybe taken already?) or +bot
What we see in the video would be upside-down on top of a cantilevered bed?
You're using a lot of flanged BBs for the belt. Any chance to turn the belt around or will you make gt2 pulleys for smoother guides?
Re: Inside-H: Modified H-Bot drive June 04, 2016 04:57PM |
Registered: 8 years ago Posts: 5,232 |
Re: Inside-H: Modified H-Bot drive June 04, 2016 06:57PM |
Registered: 10 years ago Posts: 564 |
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o_lampe
A bit OT, but for your "problem" a belt with herringbone teeth would be great. Don't know if these exist. Time to file a patent...again