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Nick
Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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Thanks Daniel, excellent tip! I was worried about the weight of 8mm steel plate so its all 6mm now. If there is some spare weight later on, I will make some of the wedge & corner parts 8mm again. I won't have the tools to fix dents or broken welds, so its best to be a bit cautious.
@ Aaron; I just can't bring myself to have exposed wheels at the back, at least not without a test model. My thinking about the current wheel position is that there will be high friction from the fixed wedge scraping on the floor; to make the bot fast & controllable, its better to have more weight over the wheels and less weight over the wedge. With the current wheel position, there is probably still about 2/3 of the weight on the wedge, enough to stop it lifting under acceleration.
If the wheels were right at the back the side armour would be poorly supported at the corners and the wheels would be open to attack - the Touro Light guys would go straight for them!
I like Glen's solution better. It needs an extra radio channel and uses up weight, but it doesn't give up other advantages. I plan to make a test frame from plywood and concrete for weight; if wheels at the back work out on the model, then I will change the design.
General
The CAD for the disk is finalised, it was almost balanced from my first 'eyeball' attempt and a little tweaking got the centre of gravity a tiny bit on the side of the counterweight. once the disk is cut out, it will be easy to drill or grind down the counterweight side for a perfect balance. Its not even very noticeable that the disk even has a counterweight; the rim segment opposite the tooth is just 6.3mm thicker than the rest of the rim .
The frame design has plenty of room for larger batteries; weight permitting, Ogre could run on 44 volts (ie two 6S packs). That would give the weapon motor more torque and RPM as well as more driving speed. The Dewalts will need some stress testing to see how they cope with an extra 7 volts abut its not a large percentage jump so they will likely be OK.
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Wed May 16, 2012 12:16 pm |
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