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#31
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
221 Robotics also has been putting bearings directly into the 1x2" tube without bearing blocks. Although this is a chain-in-tube design.
http://www.team221.com/viewproduct.php?id=140 |
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#32
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
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One of our sponsors just cut 1" thick steel for mounting forks to a front end loader that needed a perfect 2.25" diameter hole. They used a plasma cutter and didn't even clean up the edges. They are perfectly straight, perfectly sized, and fit like a glove. It is all about using the machine properly and with the correct settings. |
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#33
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
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What tolerance do you hold on the plasma cutter? |
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#34
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
If cutting fast and I don't care it gets up in the .030-.050 range. But if I take my time and get the settings right it is under .010. I'm not saying we don't do a little cleanup after cutting, but it is far more accurate than I am.
I have cut three plates for our mockup gearbox and on all three the gear mesh is very close to perfect. |
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#35
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
Wow, thanks for all the machining advice. We are going to talk to our sponsor and make a decision. I'll post back here once we are finished
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#36
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
I noticed how the 3 cims are really close to each other. How were you able to achieve this because I found that while its possible to get a small gap by using a smaller tooth gear, it wasn't possible to get such a small gap because you are limited by the bearing size (.375X.875 flanged bearing) which interferes with the placement of the cim motors.
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#37
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
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#38
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
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The first was use plate thicker than the Bearing, we went this way because we had 3/8 plate left over from last year and it was quicker than waiting for thinner stock to arrive The second was to make cim-spacers, which would offset the CIM face. Then pocket out the required curve in the spacer to make the bearing fit. A little bit hacky, but I've tried it before. Another important note is it increases the overall length of the gearbox, pinching the bellypan even more The third was to flip the bearing around, then use the overlap from the cims to hold the bearing in the hole (aside from the press fit). We chose the first simply because we didn't want to waste time on the CNC. In the future, with a single reduction, I'd prefer 1/4in plate and method 3........ Depending on the game next year, I'd actually prefer a 2-speed over the single reduction. In other news, I got the CNC plasma cutter dialed in and thus far I haven't seen any warp. I cut 5 of the diamonds into a test strip, running at ~45-50 amps and 130IPM. There wasn't any warp, but perhaps more interestingly, the cut edge was cool to the touch immediately after cutting. I'll be cutting the bellypan next Monday, and I'll document that more throughly. Last edited by Dunngeon : 24-11-2014 at 20:52. |
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#39
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
I think that the reason I am unable to have the 3 cims so close to each other in my gearbox is because it is a shifting gearbox. From what I can tell, the gearbox you have on this drive train is a single speed. Basically my gearbox is the same as the WCD DS gearbox but with smaller shafts for the idler gears which means smaller bearings and a closer spacing between the bottom 2 cims to the top cim.
It would be interesting to see if anyone has gotten the cims with a small spacing using a dog shifting gearbox |
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#40
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
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#41
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UPDATE!
Hey CD,
Small update today The drivebase has been finished for a few weeks, I'll post pictures soon. Our first revision of the bellypan, which was CNC Plasma Cut, failed. We had issues with air pressure dropping below 65 PSI, and the entire table wasn't flat which is why part of the pan wasn't cut. We plan to either retry with the CNC Plasma, or route a wood/poly-carbonate sheet. ![]() We are waiting for parts, seems like all of our orders have been held up along the way. Our wheel hubs have been finished, but are missing tread for the reason above ![]() ![]() ![]() Last edited by Dunngeon : 07-12-2014 at 23:49. |
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#42
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
A matte black dissipates heat faster than a glossy black. (I've even been thinking about painting the CIM coolers matte black
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#43
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Re: pic: CV Robotics WCD 6wd Drivebase Prototype
Are you doing this in an effort to increase convection emissivity or radiation emissivity?
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