Finally fixed my bedcover

[L8 APEX]

I broke the hinges on my Lund fold up cover at least a year ago. I have been so busy I just threw it in the back of the shop. I meant to call Lund and order some new hinges but I decided to make my own this afternoon. I took a scrap round of UHMW and milled and drilled two new hinges. It works great and I am covered once again. I hope my mileage goes up a little now.
Round scraps of UHMW purchased on eBay.
http://www.svtgalleries.net/gallery/data/500/medium/CIMG6793.JPG
Restored old Beaver mill.
http://www.svtgalleries.net/gallery/data/500/medium/CIMG6795.JPG
Drilling the holes before seperating the pieces.
http://www.svtgalleries.net/gallery/data/500/medium/CIMG6797.JPG
New hinge in place, broken hinge etc..
http://www.svtgalleries.net/gallery/data/500/medium/CIMG6798.JPG
New hinge in action.
http://www.svtgalleries.net/gallery/data/500/medium/CIMG6800.JPG
Covered once again! I wish I had it done for L Fest but didn't get to it...
http://www.svtgalleries.net/gallery/data/6072/medium/CIMG3229.JPG

[tiffo60]

looks pretty sharp:tu:

[gagspa]

We bought a Jason hood about 2.5 years ago and have regretted ever since. I am on my 3rd one so far. This one now has all the rubber edging coming off and the big rubber strip at the front that keeps the water out has also fallen off :mad:

At least you are having better luck than us.

[Moonshine]

Nicely done, but educate me. What's UHMW?

[99WhiteBeast]

Nicely done, but educate me. What's UHMW?
+1

[tiffo60]

Nicely done, but educate me. What's UHMW?

Ultra-High Molecular Wieght

[tiffo60]

Ultra high molecular weight polyethylene

From Wikipedia, the free encyclopedia


Jump to: navigation (http://en.wikipedia.org/wiki/Ultra_high_molecular_weight_polyethylene#column-one), search (http://en.wikipedia.org/wiki/Ultra_high_molecular_weight_polyethylene#searchInp ut)
Ultra high molecular weight polyethylene (http://en.wikipedia.org/wiki/Polyethylene) (UHMWPE), also known as high modulus polyethylene (HMPE) or high performance polyethylene (HPPE), is a thermoplastic (http://en.wikipedia.org/wiki/Thermoplastic). It has extremely long chains, with molecular weight (http://en.wikipedia.org/wiki/Molecular_weight) numbering in the millions, usually between 3.1 and 5.67 million. The high molecular weight results from a very good packing of the chains into the crystal structure (http://en.wikipedia.org/wiki/Crystal_structure). This results in a very tough material, with the highest impact strength (http://en.wikipedia.org/w/index.php?title=Impact_strength&action=edit) of any thermoplastic presently made. It is highly resistant to corrosive chemicals, with exception of oxidizing acids. It has extremely low moisture absorption, very low coefficient of friction, is self lubricating and is highly resistant to abrasion (http://en.wikipedia.org/wiki/Abrasion_%28disambiguation%29) (10 times more resistant to abrasion than Carbon Steel). Its coefficient of friction is significantly lower than nylon (http://en.wikipedia.org/wiki/Nylon) and acetal (http://en.wikipedia.org/wiki/Polyoxymethylene), and is comparable to teflon (http://en.wikipedia.org/wiki/Teflon), but UHMWPE has better abrasion resistance than teflon. It is odorless, tasteless, and nontoxic.


[edit (http://en.wikipedia.org/w/index.php?title=Ultra_high_molecular_weight_polyet hylene&action=edit&section=1)]
[/URL]
Structure and properties

[URL="http://en.wikipedia.org/wiki/Image:Polyethene_monomer.png"]http://upload.wikimedia.org/wikipedia/en/thumb/6/6f/Polyethene_monomer.png/100px-Polyethene_monomer.png (http://www.talonclub.com/forum/) http://en.wikipedia.org/skins-1.5/common/images/magnify-clip.png (http://en.wikipedia.org/wiki/Image:Polyethene_monomer.png)
Structure of UHMWPE, with n greater than 100,000


UHMWPE is a type of polyolefin (http://en.wikipedia.org/wiki/Polyolefin) and, despite relatively weak Van der Waals bonds (http://en.wikipedia.org/wiki/Van_der_Waals_bonding) between its molecules, derives ample strength from the length of each individual molecule. It is made up of extremely long chains of polyethylene (http://en.wikipedia.org/wiki/Polyethylene), which all align in the same direction. Each chain is bonded to the others with so many Van der Waals bonds that the whole can support great tensile (http://en.wikipedia.org/wiki/Tensile_stress) loads.
When formed to fibers, the polymer chains can attain a parallel orientation greater than 95% and a level of crystallinity of up to 85%. In contrast, Kevlar (http://en.wikipedia.org/wiki/Kevlar) derives its strength from strong bonding between relatively short molecules.
The weak bonding between olefin molecules allows local thermal excitations to disrupt the crystalline order of a given chain piece-by-piece, giving it much poorer heat resistance than other high-strength fibers. Its melting point (http://en.wikipedia.org/wiki/Melting_point) is around 144 or 152 degrees Celsius (http://en.wikipedia.org/wiki/Celsius), and according to DSM, it is not advisable to use UHMWPE fibers at temperatures exceeding 80 to 100°C for long periods of time. It becomes brittle (http://en.wikipedia.org/wiki/Brittle) at temperatures below -150°C.
The simple structure of the molecule also gives rise to surface and chemical properties that are rare in high-performance polymers. For example, the polar (http://en.wikipedia.org/wiki/Polar_molecule) groups in most polymers easily bond to water. Because olefins have no such groups, UHMWPE does not absorb water readily, but it also does not get wet (http://en.wikipedia.org/wiki/Wetting) easily, which makes bonding it to other polymers difficult. For the same reasons, skin does not interact with it strongly, making the UHMWPE fiber surface feel slippery. Similarly, aromatic (http://en.wikipedia.org/wiki/Aromatic) polymers are often susceptible to aromatic solvents due to aromatic stacking interactions (http://en.wikipedia.org/wiki/Aromatic_stacking_interaction), an effect aliphatic (http://en.wikipedia.org/wiki/Aliphatic) polymers like Dyneema are also immune to. Since Dyneema does not contain chemical groups (such as esters (http://en.wikipedia.org/wiki/Ester), amides (http://en.wikipedia.org/wiki/Amide) or hydroxylic groups) that are susceptible to attack from aggressive agents, it is very resistant to water, moisture, most chemicals, UV radiation, and micro-organisms.
Under tensile load, UHMWPE will deform continually as long as the stress is present - an effect called creep (http://en.wikipedia.org/wiki/Creep_%28deformation%29)

[L8 APEX]

It is some super tough ass plastic stuff.

[dboat]

Ultra-High Molecular Wieght


yep, its used in woodworking a lot too..

[Chris94L]

The hell with all that **** Tifton, I like Terry's answer better :d

[tiffo60]

The hell with all that **** Tifton, I like Terry's answer better :d

that definitely was the easier way to put it:rll:

[Tex Arcana]

http://www.svtgalleries.net/gallery/data/500/medium/CIMG6795.JPG

I wonder if that mill would fit in the back of my truck...:d