pinnace project

[wardd]

http://www.coldjet.com/en/informatio...e-blasting.php


What is Dry Ice Blasting?
Dry ice blasting is similar to sand blasting, plastic bead blasting, or soda blasting where a medium is accelerated in a pressurized air stream to impact a surface to be cleaned or prepared. But that's where the similarity ends.

Instead of using hard abrasive media to grind on a surface (and damage it), dry ice blasting uses soft dry ice, accelerated at supersonic speeds, and creates mini-explosions on the surface to lift the undesirable item off the underlying substrate. If you want to read all the technical details, see the How CO2 Blasting Works page.

http://www.youtube.com/watch?v=VUwiA...eature=related



Dry ice blasting has many unique and superior benefits over traditional blasting media.
Dry ice blasting:
is a non-abrasive, nonflammable and nonconductive cleaning method
is environmentally-friendly and contains no secondary contaminants such as solvents or grit media
is clean and approved for use in the food industry
allows most items to be cleaned in place without time-consuming disassembly
can be used without damaging active electrical or mechanical parts or creating fire hazards
can be used to remove production residues, release agents, contaminants, paints, oils and biofilms
can be as gentle as dusting smoke damage from books or as aggressive as removing weld slag from tooling
can be used for many general cleaning applications
Cold Jet dry ice blasting uses compressed air to accelerate frozen carbon dioxide (CO2) "dry ice" pellets to a high velocity. A compressed air supply of 80 PSI/50 scfm can be used in this process. Dry ice pellets can be made on-site or supplied. Pellets are made from food grade carbon dioxide that has been specifically approved by the FDA, the EPA and the USDA.
Carbon dioxide is a non-poisonous, liquefied gas, which is both inexpensive and easily stored at work sites.

[jim1968]

again thanks to all for there good advise. i am just about to order some green oak to replace ribs and beam shelf the sections are ribs 3x3 and beam shelf 4x3 , having never steam bent timber before i thought i might be quicker and easer to laminate these fron 3x1 and 4x1 and plenty of copper fastenings . can this be done if so what would you use to glue them together as i keep reading its hard to glue green oak, thanks jim

[keith66]

You will be a strong man who can bend 3x1 oak, even that will need steaming, get yourself an old stainless beer keg they make excellent steam generators with either a big gas ring underneath or a fire if its set on bricks.
Steaming large sections of timber such as beamshelves can also be done with polythene tube just slide it over the part & get the steam in. Clamp it in place with the polythene on it & cut it away afterwards. As for glues for green oak i am not sure maybe titebond?

[Classicpower]

If you strip epoxy oak ribs you are alot better off... You can even scarf the broken ribs and if properly done it will last a lifetime.. Also you can remove the damaged rib and build a jig... Or staple and epoxy strip after strip until you reach the thickness you need... but using green oak may not give you the strength you need and can still warp. Hope this helps