Earthwormjim's Stuff

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earthwormjim
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Re: Earthwormjim's Stuff

Post by earthwormjim »

To sort out the self righting problem,I have re designed the lifting arm.
The new servo arm has 5mm longer travel in the slot,and the slot is also 7.5mm lower at the point nearest the pivit,which should increase the travel by around 15 - 20mm (guess).
The old one is on top,the improved one at the bottom.
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Should work,in theory at least! :)
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earthwormjim
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Re: Earthwormjim's Stuff

Post by earthwormjim »

Decided to try out the original design for the flipper on the front...

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05mm Ti sheet.128g.Seems easier to drive like this.
Quick video flipping 180g 4" cube.

http://www.youtube.com/watch?v=mmmellmc ... ature=plcp

Think I might keep it like this,and see how it performs.
Cheers Jim. :)
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Remote-Controlled Dave
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Re: Earthwormjim's Stuff

Post by Remote-Controlled Dave »

I prefer that configuarting, Jim. Think it looks better, and harder to avoid the flipper. I'd be more worried about fighting this version than the first one.
Die Gracefully Robotics
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earthwormjim
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Re: Earthwormjim's Stuff

Post by earthwormjim »

Thanks Dave. :)
I am thinking I might build another one,with the other front end,and see which one works better.
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Re: Earthwormjim's Stuff

Post by earthwormjim »

Right.I have not been happy with the front end of scarab.If I used a flat sheet of Ti,then i couldnt put anything on the sides to stop it getting stranded,so on the fifth attempt...

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I have come up with something that has a shallow sloped front,ramped areas to the sides,and catching fins to stop robots from going completely over the top.The 1mm Ti armour weighs 49g!So it now tips the scales at 152g,but I am sure I can loose 2g from the carbon undertray.New lifter arm is on its way from shapeways too,should arrive tomorrow,I hope.Then it might even self right! :wink:
And the new wheels got here this week too. :)

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Post by razerdave »

That's fantastic :) how do you make the ti scoop bends with 1mm so neat? Mine are all a bit, well, imprecise :p
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Re: Earthwormjim's Stuff

Post by earthwormjim »

Thanks Dave.
Bends were made using a very big vice,with aluminium jaws,a really big hammer,and a grinding wheel!
And a fair amount of elbow grease! :)
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Post by razerdave »

What do you cut the Ti with ? I have to cut the 1mm stuff with either my angle grinder or a dremel!
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Post by earthwormjim »

I use a jigsaw!
For Ti,I use a fine metal blade,which goes dull after about 20cm,but is still useable for alot longer,albeit with alot more force behind it.For the bits that I couldnt get bthe jigsaw into,I used a dremmel,but went through 3 cutting disks in about 4cm! :cry:
Then I use a bench mounted grinding disk(£20 from Lidl),to fine tune the edges.
I wouldn't like to work with anything thicker than 1mm,it is seriously tough!
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Re: Earthwormjim's Stuff

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