- Joined
- Jan 19, 2007
- Messages
- 288
Why some knifemakers are planting layer of fibre or polyester cloth when mounting the scales to the tang? Does it makes the glue conection weaker.
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Fibre or textile between tang and scales?
- Thread starter knifemaniac
- Start date
- Joined
- Oct 4, 1998
- Messages
- 427
Actually, the opposite, if you use a layer of polyester cloth in an epoxy joint it keeps the glue at a specific thickness. It will keep the glue from all being pressed out of a tight joint and actually aid in the work holding properties fo the glue.
Alan Folts
Alan Folts
As far as I understand, certain glues such as wood glue dont perform well if they are in a thick layer and should always be thin. The glue material itself is not structurally strong even though the bond is. Epoxy in itself is strong enough to be built up and act as a 'filler' as well as adhesive.
Lang
Lang
- Joined
- Jun 2, 2007
- Messages
- 610
IME, epoxy tends to be pretty brittle, but almost any filler will help. Cab-o-sil is kind of a standard for turning it into an adhesive. Wood flour (fine sawdust) is great too. A layer of ripstop nylon (think tents) is great for bonds with a large surface area as it also helps prevent creep.
Another huge problem with epoxy, as Alan mentioned, is squeeze-out which will starve the joint of adhesive. That's why it's important not to overclamp epoxy as well.
My .02
BTW - for a good introduction to epoxies, check out Gougeon's site. Their users' guide is great.
http://www.westsystem.com/
Another huge problem with epoxy, as Alan mentioned, is squeeze-out which will starve the joint of adhesive. That's why it's important not to overclamp epoxy as well.
My .02
BTW - for a good introduction to epoxies, check out Gougeon's site. Their users' guide is great.
http://www.westsystem.com/
The filler is the important part ( by filler I mean the additives put in to the basic epoxy resin by the manufacturer)... it can give the epoxy a wide range of properties... the 'grey' epoxies are more brittle as they are intended for rigid applications. 'cream' epoxies are usually flexible for flexible applications such as leather and hard plastics. Combining with a fibre greatly enhances strength as the 'brittle' epoxy then primarily only serves to provide compressive strength.
- Joined
- Jun 2, 2007
- Messages
- 610
Gotcha. I was referring only to starting with a liquid epoxy such as a laminating resin like Epiglass, and adding appropriate fillers(Cab-o-sil, microballoons,etc) oneself to create different products. You are quite right that other products such as the 'greys' already have the fillers added and will serve as both gap fillers and adhesives. Sorry if it sounded like I was contradicting your post, I simply thought it important to mention that 'epoxy' (sans fillers) is a little brittle to use as gap filler.
That whole 'written word vs. spoken word' thing....
That whole 'written word vs. spoken word' thing....
Whoops.. sorry I didnt mean it to sound like I was offended or felt like I was contradicted.. was just adding for info. You are also right on about Westsystems site... for anyone wanting to use epoxy, their site explains a lot of what anyone would want to know, especially as to how many different types of epoxies are available. Its a great site just to browse through and learn.
Lang
Lang