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post #1 of (permalink) Old 03-08-2005, 06:21 AM Thread Starter
 
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==Thick cutting board sheeting as skidplate

In the newest JP (still ugh in some ways), on page 72, there is a cool truggy looking thing that has massivly angled rockers, plated with what looks like the large teflon or thick plastic sheeting.

I've been seeing this more and more, and may consider making my crossmember a basic frame, covered with this stuff on the bottom.

What I am wondering is what exactly is the material if anyone knows? Delrin, Teflon, cutting board material? And where do you buy it?? The stuff I've seen is about 3/8-1/4 thick and is quite durable. An excellent low weight alternative to steel or even aluminum.
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post #2 of (permalink) Old 03-08-2005, 06:26 AM
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Re: ==Thick cutting board sheeting as skidplate

in the March 05 issue?

i dotn see it....or maybe i havent gotten April yet
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post #3 of (permalink) Old 03-08-2005, 07:43 AM
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Re: ==Thick cutting board sheeting as skidplate

Could be any of the plastics you mentioned, but my guess would be polypropylene. It's the stuff milk jugs, and probably cutting boards, are often made of. It's slippery, fairly tough, and very cheap. Some downsides are that it's relatively soft, and can't be glued for shucks.

PVC would probably work if properly supported, but it will crack if bent too much, especially if it's cold. Teflon and Delrin are both pretty expensive, and probably too soft. Nylon would be a good choice, but pricey. UHMW Polyethelyene is probably the most tear and abarasion-resistant material you can find.

Any of the plastics, except possibly Nylon, would need full structural backup. I wouldn't expect them to span more than about four to six times their thickness. Fastening them is a challenge. Because they're all relatively soft, Teflon especially, it would take large flatwashers and flathead machine screws. If a pointed rock dug in, it could tear the sheet loose.

If I were going to do it I'd use UHMW. But then, after building a smooth, flat skid plate I don't know if a plastic cover would add much.

Here are some prices from a catalog that just came in, for 1/4" material per square foot:

UMW $5.39
Teflon $46.76
Low-density polyethelyene $3.00
High-density polyethelyene $2.35
Polypropolyene $2.16
PVC $4.28
Nylon $19.60
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post #4 of (permalink) Old 03-08-2005, 07:54 AM
 
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Re: ==Thick cutting board sheeting as skidplate

have pastic like that. avialble at farming stores for the underside of corn/beans heads to help them slide along the ground. is a wearable item, so it ios cheap. plan on using somethign simil;ar. about 1/2" thick. extremely durable except when cold...........
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post #5 of (permalink) Old 03-08-2005, 10:26 AM Thread Starter
 
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Re: ==Thick cutting board sheeting as skidplate

What catalog lists those material sheets?

The JP must be the April '05 issue, I just got it yesterday.

I agree that higher density PET is probably the best choice, but at 1/3" thickness, I would be willing to span much further than you propose. I would have to get a sample to see how flexy, but if I get something like a cutting board, those are very rigid.
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post #6 of (permalink) Old 03-08-2005, 10:37 AM
 
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Re: ==Thick cutting board sheeting as skidplate

Well unless I was planning on sliding over grass, corn, or dirt, I would not want that soft plate under there. I like a hard metal plate so when it contacts with a sharp edge or point it will SLIDE. Soft material for a skid plate will let sharp objects DIG IN and grab you [img]images/graemlins/grin.gif[/img]

Now this is entirley my opinion,,, but it has merit [img]images/graemlins/neener.gif[/img].. I think,,, [img]images/graemlins/bag.gif[/img]
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