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Discussion
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26-01-2016 10:49
ThaddeusMaximus
Re: pic: First Custom Chassis
...there's cross members, right?
Bellypans provide support but not all types of support.
26-01-2016 10:57
RoboAlum
Re: pic: First Custom Chassis
yes we have a top cross bar just not shown in picture
26-01-2016 10:58
ThaddeusMaximus
Re: pic: First Custom Chassis
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Originally Posted by RoboAlum
yes we have a top cross bar just not shown in picture
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26-01-2016 11:29
ThaddeusMaximus
Re: pic: First Custom Chassis
Top is what I'm interpreting that you have planned, bottom is what I would suggest. Something that links in at multiple points so that the combination of force reactions produces a moment.
https://goo.gl/photos/wxTJnghMbhq163Md7
Something like
26-01-2016 11:31
Jon Stratis
Re: pic: First Custom Chassis
Out of curiosity... how are you attaching bumpers to the front/back corners? You'll need some sort of frame member extending past the wheel on the corner, but your outside plates appear to stop short.
If it were me, I would add support with some more C or square tubing across the front and back. Bolt it into the existing C channel and into the belly pan.
As an example, here's our custom chassis this year (We've only done a custom chassis once before, in 2009).
26-01-2016 11:51
RoboAlum
Re: pic: First Custom Chassis
were building an upper structure that will pertrude outward past the tires while still being under 15"
26-01-2016 13:28
philso
Re: pic: First Custom Chassis
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Originally Posted by Jon Stratis
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Is that a mechanism for determining the width of your chassis?
26-01-2016 20:22
MattC9
Re: pic: First Custom Chassis
We had a similar design a few years back in 2012 and we ended up having turning issues. We had gearboxes on our corner wheels then chain running from the rear wheels to the center wheels all 6 wheels were powered but this still caused some turning issues. At the time we also had the same exact tires on our robot. What will happen when turning with a drop center design is the weight is going to transfer to the middle wheels (powered) and the front corner wheels (unpowered). When this happens only 50% of your powered wheels will be touching the ground and it can cause some turning issues. A simple fix for this would be to add another belt run from the center wheels to the front wheels, your team could do this in a multitude of ways. Let me know if you have any more questions, good luck!
26-01-2016 23:39
Ken Streeter
Re: pic: First Custom Chassis
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Originally Posted by Jon Stratis
As an example, here's our custom chassis this year (We've only done a custom chassis once before, in 2009).
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I'm curious about the plywood bases for the bumpers in the corners -- it almost looks like they may be screwed right in to the frame (unless those are captive fasteners I see and the bolt comes in from the robot side and is removable) and would be hard to remove from the robot after the fabric is added.
27-01-2016 00:00
Jon Stratis
Re: pic: First Custom Chassis
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Originally Posted by Ken Streeter
Looks nice!
I'm curious about the plywood bases for the bumpers in the corners -- it almost looks like they may be screwed right in to the frame (unless those are captive fasteners I see and the bolt comes in from the robot side and is removable) and would be hard to remove from the robot after the fabric is added. |
But, it is nice to have the bumpers proceeding apace with the rest of the robot! Fabric should be screen printed and ready for sewing sometime next week, and by then we should have the attachment process finished.
With manipulators that hang outside the frame perimeter and needing to get down to the ground, having bumpers in place early is an absolute must!
27-01-2016 09:20
philso
Re: pic: First Custom Chassis
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Originally Posted by Jon Stratis
The plywood for the bumpers is bolted into the 1x1 uprights, which then fit into slotted members that are welded onto the frame. We'll be drilling straight through the bracket and the 1x1 uprights to add some pins to hold it together. In the picture above, the bumpers literally can be pulled straight up and off the robot.
But, it is nice to have the bumpers proceeding apace with the rest of the robot! Fabric should be screen printed and ready for sewing sometime next week, and by then we should have the attachment process finished. With manipulators that hang outside the frame perimeter and needing to get down to the ground, having bumpers in place early is an absolute must! |
It is very nice to see a robot where the bumpers are not an afterthought.
27-01-2016 09:25
Jon Stratis
Re: pic: First Custom Chassis
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Originally Posted by Peyton Yeung
I spy a tape measure.
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27-01-2016 19:16
RoboAlum
Re: pic: First Custom Chassis
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Originally Posted by philso
It is very nice to see a robot where the bumpers are not an afterthought.
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27-01-2016 20:48
cait.schroeder
Re: pic: First Custom Chassis
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Originally Posted by Peyton Yeung
I spy a tape measure.
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