Delrin Chassis Thickness

[DKNguyen]

Hello everybody. I was just needing some opinions. For a 4-link Delrin chassis for a 25lbs rig, how thick do you think the side and base plates out to be? I was thinking 1/2", the maker recommended 1/4" because that's what he uses all the time and it costs half as much to buy.

THanks!

[Offroader5]

Hmm, 25 pound rig huh? I have used 3/16" for a 10 pound super, but to go over twice that in weight...I'd say 1/4" is a minimum. Maybe 5/16" would be a happy medium before going as thick as 1/2".

Much of it will depend on how many cross ties from plate to plate you'll have, and how large the plate design itself is.

[DKNguyen]

The chassis itself is 6-7" wide and 15-16" long. There aren't going to be any cross-ties as much as there will be 3 crossplates to tie the two halves together (you know, one for front, rear, and center) similar to the layout of the reign chassis, but wider with crossplates instead of crossties.

http://www.reignrc.com/images/K2-3/k2-3l.jpg

[F250]

Originally Posted by DKNguyen

Hello everybody. I was just needing some opinions. For a 4-link Delrin chassis for a 25lbs rig, how thick do you think the side and base plates out to be? I was thinking 1/2", the maker recommended 1/4" because that's what he uses all the time and it costs half as much to buy.

THanks!

What the hell are you building?

[DKNguyen]

I had some split-axle solid axles built (Reapers customs) for me so I could them on a robot that could still use all the gearboxes, wheels, and motors, and shafts for RC trucks but still let it turn on the spot. It needs two transmissions (one to drive the left and right side) which is why it's so wide.

I'm not sure how much everything weigh so I kind of pulled really conservative ballpark numbers out of the air for all the parts and it came to 25lbs (I was also given a number of 18lbs for an all metal rig so I tacked on a bunch more electronics and battery weight). I'm using two 3025-12s to drive it anyways (because they're the slowest Hyperions of the right size ones that have a 5mm shaft so I can use an unmodified RC4WD gear) so it might as well be a bit heavy. It also gives me an excuse to build a big honking BLDC motor controller.

[JUSTGOINGSLOW]

Sounds lie your making a moon rover instead of a crawler. you will have to post some pictures when its done

[DKNguyen]

Originally Posted by JUSTGOINGSLOW

Sounds lie your making a moon rover instead of a crawler. you will have to post some pictures when its done

But the options that are normally used for attaching images seems to be missing on this particular board? Otherwise I'd post pictures of the axles.

[Offroader5]

For a chassis plate that large with little cross ties, I'd definitely use 1/2" material.

You can attach images 2 ways...either click the little yellow mountain image in the post authoring toolbar (3 over from the one you used to post the link) if you have the image on the internet....or you can attach the file from your computer. I am not sure though if the "file attachment" ability is available when you're not a star member?

[DKNguyen]

Originally Posted by Offroader5

I am not sure though if the "file attachment" ability is available when you're not a star member?

THat could be why.

[lunchbox]

I think I would go with 1/2 inch. 1/4 just seems a bit flimsy for the size and weight you are talking about. Be sure you round the cut angle out so you don't have sharp angles cut out of the derlin. Those sharp angles pose a stress point.