Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Very nice work!
Looking at the drive motors I can see some possible issues:
How are you going to grt the motors in & out - do the 2 bearing guide blocks detach? I find that getting motors out for servicing is a big feature in the pits and the fewer screws yo have to remove, the better!
You might look at getting rid of the inner bearing block - it doesn't look essential to me.
Having a tensioner on those long drive belts will make them more reliable - they are sure to stretch after use.
What is holding the axle splines into the end of the gearbox. If its just the timing pulley, you might want to add something else to make sure the axle cannot be pulled out.
I'm guessing you have already thought of all that, but it doesn't hurt to ask...
Fri Jul 31, 2009 11:27 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
looks like its a double bearing block and theres no support on the outside of the wheel so the armour is free to move and get bent without binding anything in the drive up.
guessing its all one piece in the cad cause its easier to do it in solidworks that way but that would be awesome on so many levels if it was all one piece
hope the waterjetters give you the cut out sections. looks like theres a few kilos worth of metal youd get back _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Sat Aug 01, 2009 1:03 am
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Thanks guys.
Its all one piece, until I'm done with the final shape then I'll chop it into individual bits. You might notice there's room there for all the screws.
Double bearing block for overhung wheels and yes capturing the axle is always a pain and set screws don't cut it.
@ this stage for me its about overall weight and design. Once I have a bot I'm happy with and it's underweight THEN i'll look into each area in more detail and refine(that frame is almost 2.5X stronger than it needs to be). I'll will post all updates here...
Thanks again guys, cheers. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Sat Aug 01, 2009 9:30 am
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Wedge profile:
What do ya think? _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Mon Aug 03, 2009 10:13 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
The M1 cells fit back into the bot now, which is great. That reminds me, I can now start building 6 cell packs. I have 20 cells so 3 packs would be good. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Mon Aug 03, 2009 10:22 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
quote:Originally posted by assassin:
Wedge profile:
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
How about that? _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Aug 04, 2009 7:31 am
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Looks good. It would take a lot of deformation before the flipper arm would jam in that front plate. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
That looks very tough to me! The only suggestion might be to change the rows of mounting screws for brackets welded to the back of the wedge - screws are hard to get out after their heads are smeared by a spinner.
Tue Aug 04, 2009 5:18 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Thanks guys. Screw holes will be counter sunk, and It looks like it will be about 4mm titanium($$$). What do you think about 4mm ti Nick? How do you think that would hold up? Its @ a pretty low angle too. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Aug 04, 2009 5:41 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
4mm would be enough if it is angled like in your design. Angus had some 5mm stuff and Jolt hardly managed to scratch it. The main thing you need to worry about is a spinner catching the leading edge of the wedge and high centering you. It would need massively thick Ti to prevent that problem.
Tue Aug 04, 2009 5:50 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
I'll start the last major design feature tomorrow, the shock mounted armor.
Hopefully my aluminum for the ram will arrive tomorrow too. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Aug 04, 2009 11:38 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
One certified piece of 7075-T651, let the machining begin!
_________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Fri Aug 07, 2009 6:25 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Does your four bar linkage mechanism stop the travel of the ram?
I look forward to seeing your progress. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
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