beetle then?
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Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

I think it would be too weak as a beetle. My servos would stall with about 700 grams weight of force at the tangent of the feet (ignoring friction). It wouldn't have a hope of pushing a beetle.
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So even the rain that falls isn't actually going to fill our dams and our river systems

he he same with my walker.
_________________
Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Stig had weapon problems yesterday. The double sided tape that holds the lifter servo came off before the competition started. The tape was replaced but that came off also. Double sided tape seems to need to sit for a time before it is put under stress. The tape was replaced again before lunch and worked for the rest of the day.

Other than that, Stig and Abaddon were OK for the rest of the day.

Small Hadron Collider has a new 6 A BotBitz ESC to get it going. That should make it more reliable than it was at Nationals 2012.
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So even the rain that falls isn't actually going to fill our dams and our river systems

I am thinking of making a drill powered lifter. The drill has 40 Nm stall torque in low gear (~400 rpm with no load). I would like it to turn a crank which would raise the lifting arm.

Has this been done before? How thick would the crank arm need to be to survive stall? The crank would be ~50 mm.
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So even the rain that falls isn't actually going to fill our dams and our river systems

i used 12mm threaded rod for Wombot originally. Then pulled appart a vice for the faster type rod...but both worked.

Let us know if ya ever need to come over and lathe something up.
_________________
Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Thanks. I might pick your brains at the feather event, if that is alright.
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So even the rain that falls isn't actually going to fill our dams and our river systems

I made this one if this is is at all like what your thinking I used a custom m16 threaded rob and the little "C" bracket connecting to the front pivot is just 6mm thick flat bar


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That looks very good.

I am thinking more like the horn on a servo. That is, a crank would be attached to the drill and a connecting rod would run between the crank and the lifting arm.

Imagine a push bike pedal. Your leg goes up and down as you pedal the bike, Your upper leg would act as the lifting arm.
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So even the rain that falls isn't actually going to fill our dams and our river systems

Good news with Aussie battler's self right

....yep that is the plan Im thinking of doing with a winch powered lifter...not sure a drill is going to have enough grunt to do all that lifting...without a worm gear setup or something.
_________________
Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

This is what I have in mind for the crank arm to go onto the end of a drill.



The bearing is 1" ID and 2" OD (from an old wheel barrow).

How thick would the steel cam need to be for a 42 Nm drill overvolted from 18 v to 22.2 v? What diameter bolt would be needed to go from this arm to the lifter? M8?

The shaft would need to be about 12 mm longer than pictured to allow for controller feed back.

Edit: I was thinking of making this a front hinged lifter like Firestorm's shape. It is planned for the Nationals (pending funding). Would this be allowed in the non spinner events? I would not want to build a robot that can only be used once a year.
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So even the rain that falls isn't actually going to fill our dams and our river systems

looks like it will work...will probably need to weld the cam onto your drill shaft just so it will not slip.

...good effort yeaerday to...Aussie Battler did us all proud
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Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Small Hadron Collider needed repair after the last event. One wheel was pretty cut up and was replaced.

I need to decide which robots should attend Nationals.
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So even the rain that falls isn't actually going to fill our dams and our river systems

The top cover is being replaced on Small Hadron Collider. I bought one of these and bent a new piece of titanium. I was happy with the bend. The titanium still needs to be heated and bent beyond the desired angle. The resulting bend shows no sign of fractures.

The three plates in the bender can be individually removed.

I have been trying to upload a picture of this to Photobucket all week but it isn't happening.
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So even the rain that falls isn't actually going to fill our dams and our river systems

that looks like a cool tool
_________________
Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015