Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun Apr 07, 2013 11:35 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun Apr 28, 2013 3:27 am
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sat May 04, 2013 4:36 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
i used 12mm threaded rod for Wombot originally. Then pulled appart a vice for the faster type rod...but both worked.
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Thanks. I might pick your brains at the feather event, if that is alright. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun May 05, 2013 7:02 am
Don Experienced Roboteer
Joined: 21 Feb 2010
Posts: 355
Location: Gladstone, Queesland
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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Sun May 05, 2013 6:40 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Mon May 06, 2013 3:33 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
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
Mon May 06, 2013 11:15 am
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun May 19, 2013 7:13 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
looks like it will work...will probably need to weld the cam onto your drill shaft just so it will not slip.
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Mon Jun 10, 2013 6:30 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
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. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sat Jun 29, 2013 5:53 am
miles&Jules Experienced Roboteer
Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD
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