Re: [bolger] Re: fastening UHMW
Here is a boat site that sells UHMW sheets ( at a
high price!!)
James
----- Original Message -----From:shansen@...Sent:Saturday, March 17, 2001 2:06 PMSubject:[bolger] Re: fastening UHMW--- Inbolger@y..., "Alex" <ravencoast@t...> wrote:
>Next time I am there in April, I'll see if I can politely squeeze
>out of them the source of these vast sheets of UHMW plastic!
There should be a source of UHMW poly near you but for examples of
what shapes are available and how much the stuff costs, you can check
outhttp://www.usplastic.com
They have sheets as well as planks up to 10' long and 1.5" thick and
12" wide.
I discovered the stuff when I needed some easy to machine plastic
with good vacuum (vapor pressure/water uptake) and electrical
characteristics for a technical project but I've been using it for a
bunch of things since.
Steve
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--- In bolger@y..., "Alex" <ravencoast@t...> wrote:
what shapes are available and how much the stuff costs, you can check
outhttp://www.usplastic.com
They have sheets as well as planks up to 10' long and 1.5" thick and
12" wide.
I discovered the stuff when I needed some easy to machine plastic
with good vacuum (vapor pressure/water uptake) and electrical
characteristics for a technical project but I've been using it for a
bunch of things since.
Steve
>Next time I am there in April, I'll see if I can politely squeezeThere should be a source of UHMW poly near you but for examples of
>out of them the source of these vast sheets of UHMW plastic!
what shapes are available and how much the stuff costs, you can check
outhttp://www.usplastic.com
They have sheets as well as planks up to 10' long and 1.5" thick and
12" wide.
I discovered the stuff when I needed some easy to machine plastic
with good vacuum (vapor pressure/water uptake) and electrical
characteristics for a technical project but I've been using it for a
bunch of things since.
Steve
I visited the aluminum jetboat manufacturer Outlaw Marine in Red Deer
Alberta to see how they fasten the UHMW skid pads onto the entire
bottom of their riverboat hulls. They use stainless steel bolts that
have Allen (as in Allen Wrench) heads, countersunk to be lower than
the surface of the plastic (probably use a Forstner bit to create a
clean hole with smooth sides and flat bottom). They have to sink them
deep enough to allow for wear of the plastic, but not so deep they
pull through. The bottoms of the heads of these Allen bolts have wide
enough surfaces to act as washers themselves, and they fill the width
of the hole snugly (prevents sand and rocks from sticking, I'd
imagine). With such a nice tight fit around the circumference of the
bolt head, there is no need to leave extra room to get a wrench on
the head of bolt if it were a regular one. I didn't see that they
filled the hole with anything, but forgot to ask. I somehow doubt
anything would stay in the slippery hole for long while the bottom is
scraped over jagged rocks, in any case.
Next time I am there in April, I'll see if I can politely squeeze out
of them the source of these vast sheets of UHMW plastic!
Alex Christie
Denman Island, BC
Alberta to see how they fasten the UHMW skid pads onto the entire
bottom of their riverboat hulls. They use stainless steel bolts that
have Allen (as in Allen Wrench) heads, countersunk to be lower than
the surface of the plastic (probably use a Forstner bit to create a
clean hole with smooth sides and flat bottom). They have to sink them
deep enough to allow for wear of the plastic, but not so deep they
pull through. The bottoms of the heads of these Allen bolts have wide
enough surfaces to act as washers themselves, and they fill the width
of the hole snugly (prevents sand and rocks from sticking, I'd
imagine). With such a nice tight fit around the circumference of the
bolt head, there is no need to leave extra room to get a wrench on
the head of bolt if it were a regular one. I didn't see that they
filled the hole with anything, but forgot to ask. I somehow doubt
anything would stay in the slippery hole for long while the bottom is
scraped over jagged rocks, in any case.
Next time I am there in April, I'll see if I can politely squeeze out
of them the source of these vast sheets of UHMW plastic!
Alex Christie
Denman Island, BC
Hi there, Some of you folks have mentioned plastics as wear strips; teflon,
nylon, etc. Chuck had mentioned UHMW, which is the ultimate wear strip.
Caterpillar Tractor Corp has used the stuff as a pad that the bucket of
their big dump truck beds rest against the frame on! It is pretty slippery,
too. Teflon, although slippery and wear resistant, is soft and has poor
abrasion resistance. UHMW is harder, cheaper, and in my opinion an
excellent choice for the bottom or side of anything that rubs against rock,
sand, etc. I suspect that the challenge would be to figure out how to
fasten the strips of UHMW (ultra-high molecular weight polyethylene) plastic
to the bottom of your skeg. If the fasteners were countersunk then perhaps
the fastener heads would not wear off.
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nylon, etc. Chuck had mentioned UHMW, which is the ultimate wear strip.
Caterpillar Tractor Corp has used the stuff as a pad that the bucket of
their big dump truck beds rest against the frame on! It is pretty slippery,
too. Teflon, although slippery and wear resistant, is soft and has poor
abrasion resistance. UHMW is harder, cheaper, and in my opinion an
excellent choice for the bottom or side of anything that rubs against rock,
sand, etc. I suspect that the challenge would be to figure out how to
fasten the strips of UHMW (ultra-high molecular weight polyethylene) plastic
to the bottom of your skeg. If the fasteners were countersunk then perhaps
the fastener heads would not wear off.
_________________________________________________________________
Get your FREE download of MSN Explorer athttp://explorer.msn.com