[chbot] A possible challenge

[m.beckett at amuri.net]

Or you could not be so lazy and go push the collection device around.
Think of the benefits:-
Fresh air
Exercise (saves on gym fees)
You can check on the property at the same time.
You can pick up the baranches and other rubbish lying at the bottom of 
the trees.
You can compensate for the extra dump when the wind blows

Soemhow you will need to device something to uplift them.
I hear for the neighbour they use a vacuum cleaner style picker for the 
Hazelnuts.


Mark


On Tue, 11 Oct 2011 00:23:59 +1300, Synco Reynders wrote:
> Interesting idea... couldn't help but run some numbers.... I get:
> So firstly 1acre is ~4000m^2, or a ~63m square field.
> Assuming the robot is ~ 0.5 wide, and we were to do a full sweep of
> the field in half a day (12 hours), we get:
> Total distance traveled ~ (63 * 2) * 63 = 8000m
> Average speed ~ 8000/12/3600 = 0.2m/s
>
> I just happened to have a bag of walnuts and found:
> ~50 walnuts fit in a 1 litre container
> A dried walnut weighs about 6grams so budget 10g for a fresh one.
> Assuming a walnut is spherical ~30mm diameter
>
> Next guess energy consumption... Thinking back to the days of driving
> my RC car around... it had a 700mAh battery and it would last ~10min.
> So to last a full acre we need: 12hrs * 6 * 0.7Ahr =~ 50Ah which is
> ~5kg of LiPo batteries (assumes 1000mAh is ~100g)
> or ~250g of fuel (can be petrol/diesel/kerosene and assumes 33%
> conversion loss)
>
> So far, I'd suggest using a little petrol motor which generates
> electricity / (drives pneumatic pump?) to get duration and a quick
> turn-around time.
>
> Now the mechanics... I'll let someone else design this.
> Hope this has helped.
> /s
>
>
>
>
> On 10 October 2011 21:23, Robin Gilks <robin at gilks.org> wrote:
>> Greetings
>>
>> I'm just starting to put together the specs for a challenge to make 
>> a
>> walnut picker-upper - nuts in NZ are picked from the ground having 
>> dropped
>> naturally rather than the tree being shaken - it avoids having to 
>> remove
>> the husk.
>>
>> So far I have the following criteria:
>>
>>  * cover 1 acre of ground in 0.5 days, repeating for about 5 weeks
>>  * avoid trees and irrigation nozzles (tricky as that is where most 
>> of the
>> nuts land)
>>  * return 'home' to empty and recharge. Not sure about the total 
>> load
>> expected from an acre but during the 0.5 day cycle it would only be 
>> a few
>> kg.
>>  * recharge can be by battery exchange or refilling with
>> diesel/unobtainium to reduce turn-around time
>>
>> Up to the next meeting I'll assemble some pictures of manual devices 
>> that
>> may be adaptable.
>>
>> You may have guessed that I'm not thinking at toy level here :)
>>
>> --
>> Robin Gilks
>>
>>
>>
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>
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