![]() ![]() The pump will intake water along with soil and deposit on the sluice. One end of the hose should be attached to the pump and the other end should be over the sluice. This whole setup should be assembled firmly. It means you will require a 1-inch intake pipe to serve 1 feet of load. The ratio of diameter of pipe to the overload is 1:1. Build the intake system using pipes and hoses.Īn intake system must be built using pipes.īased upon the volume of deposit you aim to process, choose the diameter of the pipe. Using galvanized steel U-straps, attach them to the frame firmly.Ī better practice is to avoid welding pump and motor on the frame as it may hinder operations of the machine in the future. The plywood which you have attached on top of the frame as a part of step one will act as a base for motor and pump. The motor should be connected to a water pump. To power the dredge, you should install a lawnmower motor at the rear end. Install the mechanical components like motor and pump. If you find constructing this difficult, you can get this spare part in stores or online markets. Similarly, corrugated aluminium sheet should be soldered on top of the ladder assembly.Ī gold dredge should be operated using water, so by adding additional aluminium strips, you can create an inclination and make a provision to pour water onto sluice. Generally, use corrugated aluminium sheets for roofing. You should be familiar with soldering to build a sluice box.Īluminium strips should be soldered in the shape of a ladder with a width of 24 or 36 inches. Construct a sluice box which has to be mounted on the frame. A sluice box will be placed on the frame and a large plywood should be attached on top of it. The crossbeams of the frame should be V-shaped for it to be laterally strong. The mount should be strong enough to hold the motorized components.Īccording to the dimensions, tubing should be welded in the shape of a rectangle. The first step is to build a frame and galvanized tubular steel, 0.5 inch should be used for this purpose. To sift rapidly through large amounts of gravel, you have to build a powered dredge. Here are the steps for how to build a gold dredge: 1. Lawnmower motor connected to water pump.After I move might be a while before I get the inter net on so will be offline for maybe a week or a bit more after Thur. Just wanted to make one with all PVC and am quite happy with results. Tighten it to squash the rubber and thong more, to give more suction, but in my experiments, just a light tighten is all I need to get, pretty awesome suction. Then another washer about 35mm allowing for the rubber and thong to extrude just bigger than the washer.Īt the end of the bolt that holds all of this which I glued into the bottom of the 25 mmm I think it was, plunger piece, is a wing nut, which you can tighten and lossen at the end of the day. I have the bottom washer, then some 3mm rubber cut as best as I can with stanley knife, then the round bit of thong, then another bit of rubber just slightly smaller than the diameter of the main tube. Am experimenting with rubber washers and some thong, after I move will be going to mates at Kallangur near where I live and we're going to grind some pipe down so I can punch out 40mm rubber, or thong, the trouble with old thongs are the variation in the thickness, I am looking for an even thickness. I have tested it and works really, really good. Will bring it up next time, thinking of putting a bolt through the bottom of the nozzle at the end, so big rocks don't block it. Now to answer your question mate, looks good, this pump, but can't work out how to use the pump!! Actually just made another one, will have to do a shot soon, I designed it for Spot X for the gravel, I think it's better than my last one. Hey Yobs how are ya mate, itching to get out, but gotta move, so busy, oh I hate packing, throwing stuff out, so much stuff gone to tip. You can go as small as needed to get into the cracks. One thing to note is that we reduced the 25mm suction hose at the tip to prevent blockages by using a small nozzle cut down to 12mm. Here's a before (left) and after (right) of a bedrock area done with our original first type of ground-based setup. Note: Just added the 30cm steel ruler for scale. Still some kinks to work out with this new design. I'm still debating on whether or not to add a small base to the pump to kneel or stand on. The pump itself is a Jabsco Manual Bilge Pump and they run around $130-ish. Our previous design was all used on the ground with the pump attached to a small separate stand. It can also be left on the ground in an upright position (to let gravity do the work). Just need to attach the main PVC section to a sturdy backpack. That's why this type of hand pump works so effectively We are under the same rules and regulations here in N.S.W. ![]()
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