22-12-2016 07:22

BigHorse

Re: pic: MVRT Off-Season Sheet-metal Chassis

Let me just start by saying this is a great looking chassis.

To answer some of your questions:
Mounting electronics on the walls isn't a bad idea, but it can become very cluttered very quickly. I think I designed a chassis that had back wall mounted electronics but we never ended up cutting it.

Bumper mounts really depend on what you want to do. I have seen many different methods. Some teams do a bolt through a lightening hole, others will use angle iron to create a lip for the bumper to sit on.

We have been working on tensioning methods this last season. The best way we have found so far is to use fixed position tensioners on an array or line of holes. Slots and offcenter tensioners tend to slide out of place after frequent use, but the only thing that will ruin the tensions on a fixed position tensioner is the chain stretching. Whenever that happens we just move the tensioner down one peg and keep on driving. We have been fighting this problem for years and the method that requires the least maintaiance and headache is fixed postion tensioners with an array of holes.
We used them here if you want an example. The white plastic is delrin.

22-12-2016 08:55

GeeTwo

Re: pic: MVRT Off-Season Sheet-metal Chassis

We toyed with something similar last year with a kit chassis. We found that not only is there too little space for very much, anything mounted in there will be hard to reach and hard to see for diagnostic purposes. We wound up moving the electronics elsewhere and put an air tank back in that volume.

22-12-2016 11:25

andrew4130

Re: pic: MVRT Off-Season Sheet-metal Chassis

CAD? please pls?

22-12-2016 11:56

Ari423

Re: pic: MVRT Off-Season Sheet-metal Chassis

What's the weight on that thing? Looks really beefy.

23-12-2016 01:09

rithinrv

Re: pic: MVRT Off-Season Sheet-metal Chassis

Around 23 pounds.

23-12-2016 01:14

asid61

Re: pic: MVRT Off-Season Sheet-metal Chassis

Does that include CIMs and gearboxes?

23-12-2016 01:18

Munchskull

Re: pic: MVRT Off-Season Sheet-metal Chassis

Anand, theyes are getting good without you.

24-12-2016 00:30

nuclearnerd

Re: pic: MVRT Off-Season Sheet-metal Chassis

I'm a big fan of these automotive panel nuts for sheet metal chasses. Just add 1/4-20 bolts and a cordless impact driver, and you have a super strong bumper connection that comes off in seconds.

24-12-2016 00:54

Andrew_L

Re: pic: MVRT Off-Season Sheet-metal Chassis

Looks like they imported the STEP of the ballshifters and didn't change them, so it's likely they didn't even add mass properties, hence why Anand is asking about their weight inclusion.

24-12-2016 02:01

rithinrv

Re: pic: MVRT Off-Season Sheet-metal Chassis

No

24-12-2016 02:03

rithinrv

Re: pic: MVRT Off-Season Sheet-metal Chassis

Thanks for the suggestions, I really appreciate it!

24-12-2016 16:25

Andrew_L

Re: pic: MVRT Off-Season Sheet-metal Chassis

A few tips:

-Close the box sections for the frame, it'll make them significantly stronger.
-Add in a bellypan, it'll help with torsional stiffness
-The split front part isn't very rigid either - extra support there (+bellypan) can help with that.

Check out some of 971's drivetrains for some good methods of sheet metal implementation. There are some helpful rectangular and octagonal drivetrains in the 2015 section that you should definitely check out.

07-01-2017 02:10

rithinrv

Re: pic: MVRT Off-Season Sheet-metal Chassis

Update: CAD Files

https://drive.google.com/open?id=0B8...3liekFXR1g5ZEk