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c6jones720
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Rotating and Lifting Head Pt1 - 2007/08/10 17:57 This thread discusses the Content article: Rotating and Lifting Head Pt1

Thats brilliant! I'd have never have thought about raising the head. Its quite a useful feature. Have you decided what electronics you will use for this?
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jamesbruton
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Re:Rotating and Lifting Head Pt1 - 2007/08/10 18:04 I will be using a 'high power' Picaxe 18 project board for each motor as they have 4x output drivers for 1.5A each which should be enough.

I'm going to use Picaxe18X's as they have lots of programming space, so this will allow for me to program acceleration and deceleration steps over the range of movement. Commands will be sent wit RS232 from the Bot's serial port (or a USB - serial adapter).
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aibo_rescue
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Re:Rotating and Lifting Head Pt1 - 2007/08/11 04:03 Wahoo ... the bot got a neck ... nice! Best ... Richard
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lilytherobot
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Re:Rotating and Lifting Head Pt1 - 2007/08/13 01:33 Hi - looks great. Really like this idea...

It appears though the eye and camera had to be removed to make space? (or perhaps they are not yet re-installed?)

I'll be interested to see how step two goes with controlling the stepper motor/s... do you know what stepper motor controller you are going to be using?

I had originally considered a straight drive, but ended up going with gears for speed control, cost, and precision (I couldn't get the mouting bracket in the head to be perfectly aligned with the center pivot) - how are you tackling that? (If the the are not perfecly aligned, they head will bind when it turns). (Which is why I added the pivot arm bit on mine).

It's also interesting to see how we took slightly different approaches... my center pivot point is fixed, and the head rotates around it (via the gears), and yours does the opposite. This will give us some great comparisons...

Between these few ideas, hopefully WBR will incorporate a rotating head as part of the standard design...

Really looking forward to this one...

Dave...
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jamesbruton
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Re:Rotating and Lifting Head Pt1 - 2007/08/13 02:07 Yep - the eye assembly does still fit, just nothing to hold it in at the moment. I was quite careful to make sure I didn't have to modify the plastics to do the mod - the only exception was to cut a piece of the 'web' out of the head to make vertical space internally:



I'm still thinking about the rotate drive, although I've already built that part now as I originally intended and it looks good. The stepper motor in the base is pretty well aligned and feels ok when you rotate it manually. I think I might have to put some form of gearing in unless I use stepper motor holding all the time though because the head spins quite freely/by itself when the Bot rotates on it's wheels. The main reason for the motor in the base was because there wasn't space in the head for it.

The stepper motor controllers will be a Picaxe microcontroller that I'll program up myself, mounted on a rev-ed high power project board.

Post edited by: jamesbruton, at: 2007/08/12 18:13
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GRUNT
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Re:Rotating and Lifting Head Pt1 - 2007/08/19 04:37 James,

Impressive stuff

You try to have the PC-BOT extend it's torso wings automatically too. Like the Delorean automobiles use to do. Except they'd fold down instead of up.
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