|
|
||||||||||||||||||
CNC RouterCNC Foam Reliefs for Insulation and DecorationOur boat is to be a work boat and industrial by function, but its also our home and we want it to reflect our sense of beauty and comfort. The majority of the cruising boats we have seen follow a uniform decor guideline similar to homes in a homeowner community. We want something difference, which is part of the reason a junk sailboat appealed to us. We also have no fascination with any particular style or culture. Our little house and its decor is a blend of Columbian, Mexican, African and our boat will be a blend of the things we like as well. So the plan is to exploit our CNC table toward that end. We plan to spray the interior of the hull and pilot house with the traditional insulating foam, and then add in metal, wood or fiberglass fixtures. The fixtures will be trimmed with CNC cut foam. Any remaining wall spaces and all of the ceiling will be covered with CNC carved foam reliefs. To protect the surface of the foam, we'll coat it with epoxy or StyroSpray; www.industrialpolymers.com/styrospray.html.
"Styrospray can be sprayed with a regular hopper gun (spray the inside of your hopper with furniture wax first) or it can be brushed on and is available from Industrial Polymers. I use epoxies in various forms, depending on the application and have found this to be the best when preserving detail. I use what stucco guys call "browncoat" very often. This gives a hard but "elastomeric" finish to the foam. It can be sprayed on repeatedly, and can be carved, sanded and detailed. There are other coatings like Vanillacryl which are water based and do a nice job where constant handling is not a problem. Use Enerfoam spray glue system to glue up your pieces." -- Darrell Blanton, ( ShopBot forum: www.talkshopbot.com ) www.fxsupply.com: Vanillacryl and it's replacement: "Foam Coat" Styrene foam billets were also on the shopping list in order to make a large gunnel for our dingy that will at as flotation and a bumper. An old dock laying out in a field provided 360 cubic feet of styrene foam billet for $50. It's rough but a hand saw and a wire cutter will clean it up. STL files can be imported into CAM for the tool path generation. Larger carvings using try a 1/8" ball end. Polygons should be no larger than 0.05".
Clamping it Down We use a vacuum table, but this is a great idea from
Scott for clamping down your work piece. These are called "blind
nuts" and the local hardware store will have them if they are worth
their salt.
CNC Router for 3D Relief CarvingGood Explanation:
www.shopbottools.com/3-d_work_v2.htm Some of Our CNC Router WorkCutting dome tops for 1/4 scale model scuba tanks for the Argonaut Jr display model.
Routing AcrylicFor good quality cuts use a 3/8" or 1/4" diameter bit.
If a smaller tool is required then use one with a single spiral
flute. As a rule of thumb, the following feed rates are good
starting points if the goal is optimum edge finish. A constant
spindle speed of 18,000 rpm and a depth of cut equal to the cutter
diameter is assumed.
These are a sprockets routed from 1/8" thick Plexiglas (acrylic). The software used to design the sprockets was Sprocketeer 2.0 from IdleAmusements.com. ..and it's FREE!
Supplieswww.onsrud.com
-- Router bits for plastic:
www.onsrud.com/oc/pdf/Super_o.pdf
|
||||||||||||||||||
|
|
