A demonstration of Investment Casting using a 3D printed model. The printer was a Wanhao D7 using Senertek Castable Resin.
Using the Dado Saw at MakerBarn
A tutorial on setting up and using the dedicated dado saw at The MakerBarn.
George Carlson’s Overview of The MakerBarn
George Carlson was interviewed at last year’s Houston Maker Faire by Spaceboy. It’s a nice overview of the history and philosophy of The MakerBarn. Video courtesy of SpaceboyUniverse on Youtube.
Sand Casting at The MakerBarn
The MakerBarn recently added the capability to cast non-ferrous metals. One of the simpler ways to cast metal is to use sand to make the mold. At the Barn we have Petrobond, a special sand mix for casting. This training video shows the making of a branding iron with “The MakerBarn” on it. First a pattern was cut from Corian using the CNC router. This pattern was used to make the sand mold. Scrap aluminum is then melted and poured into the mold.
Metalworking at the barn
Woodworking has always been a big part of the work going on at The MakerBarn, but now we are seeing more metal projects being built. With the completion of the machine shop, addition of powder coating, and the near completion of the welding shop, expect to see even more heavy iron at The MakerBarn in the near future.
Jody Cochran is powder coating a small weldment used on the new miter saw table being built by Kyle Fraczek. It’s just a large washer with a 1/2″ nut welded in, but you could never find one at the hardware store. It’s used for mounting the feet on the large cabinet.
Rob Nixon made this super dial indicator holder for the lathe. Made from 6061 aluminum, brass, and steel, it should last a lifetime.
This is a special quick-clamp designed for the new welding table. It is a good example of offset turning on the metal lathe. Judging from the orange power coat paint, the steel was probably left over from a Harbor Freight project. Just some scrap from the junk box, now it’s a handy tool.
CNC Router Class
The CNC Router Class held on March 26 was a success. The class covered CNC (computer numerical control) in general, and specifically for the CNC Router. In the last half or the class, V-Carve was discussed and examples were done. V-Carve is the CAD/CAM software used for controlling the CNC router. It is a very powerful design program that can be used to generate DXF files for the laser cutters as well as G-Code to drive the CNC routers. The MakerBarn is fortunate to have a makerspace license for V-Carve which allows members to use V-Carve free of charge on their own computer.
The next class will be held on April 23rd. There are only 8 openings, so be sure to sign up early. Contact George at geotekds@swbell.net for questions or reservations. This is a members only class, there is no fee for this class.
Welding and Fabrication shop almost ready
The welding and fabrication area is almost ready. The area is located in the South-East corner of the barn. It is about 14×20 feet, not real big, but should do well for our purposes.
We covered the outside walls with steel panels, which assures there is no exposed wood in the shop. A six-foot high fence with a gate was built to control access to the area. An exhaust fan will be installed on the far wall to provide good air exchange. The area has it’s own electrical sub-panel, so installing power for welding machines should be easy.
A bit more relocating the material on the west wall, and we should be able to start setting up equipment. We a very nice oxy-acetylene rig and also some equipment that members are willing to loan to get us going.
Powder Coating at The MakerBarn
With the completion of the downdraft table/powder coating booth, and the acquisition of a new oven, we now have the facility to do powder coating. Powder coating is a process where a dry powder-like paint is applied to a metal piece using electrostatic attraction. The piece is then baked in an oven, causing the powder to melt then polymerize into a very durable coating.
Here’s an example. This is a butterfly cut from a piece of 1/4″ steel using a plasma cutter. The butterfly was cleaned and then blasted in the abrasive blaster to remove the mill scale and give a nice even surface for the power coating to adhere to. After this point in the process you should use gloves to protect the clean object from oils on your skin. Oils on the surface of the part are not good for the powder coating.
The powder is then poured into the container for the gun. The powder has the consistency of no-sift flour. It is a good idea to do this in the spray booth with the fan running. This will help contain any spills that may occur.
Using air, the powder is blown unto the steel part. There are small electrodes on the spray gun that give the powder an electrostatic charge. The object being coated is grounded, which causes the powder to be attracted to the part. Sometimes it can be difficult to get the powder into small areas. Shaking the gun a bit can help produce a heavier blast to these areas, getting past the small “force field” that occurs.
After thoroughly coating the part, it is hung in the oven to bake at 380 degrees for 20 minutes.
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fter removing the object from the oven and allowing it to cool, the finish is completely cured. No solvents are used in this process, so there is no smell or disposal of hazardous solvents. In this example, a blue high-gloss coating was used. There are hundreds of colors and finish types available. eBay is a good place to shop for various types of powder coating supplies.
Almost any metal object can be powder coated. Keep in mind that the 380 degree oven can melt plastic, char wood, and destroy rare-earth magnets.
Downdraft Table for Sanding and Powder Coating
A new Downdraft Sanding Table was built in The MakerBarn. The table has a large squirrel-cage blower from a 5 ton whole-house air conditioning/heating unit. The blower pulls air down through the table top, filters the air with a two-stage filter, and blows it back into the room. The unit moves a lot of air, and can be used for cleaning the air in the finishing room while using the stationary sanders. The hood allows the unit to also serve as a powder-coating spray booth.
The unit is 60″ wide, 30″ deep, and 65″ high. It was built using pre-finished birch plywood. This is the same type of material used by cabinet makers for internal shelves on kitchen cabinets. It has a tough epoxy finish that is easy to keep clean. The table top is a grid made from the same plywood. There were over 400 dado cuts made to produce the egg-crate style grid. A four foot LED lighting fixture makes the booth bright and easy to work with. The entire unit was designed and constructed in The MakerBarn.
Bridgeport Milling Machine for the Shop
This machine will help open new possibilities for makers at The MakerBarn.
The machine is in excellent condition. It has a 48″ table with movements of 36 x 12 inches. The Sony digital readout has a resolution of 0.0002 inches for very high precision. Installing the machine was easy, except it did need quite a bit of cleaning. It is now up and running so come visit and see what can be done. Instruction on the machine will be on a one on one basis making a small project to help familiarize the maker with basic metalworking methods.