There are a number of designs on thingiverse under peristaltic but many are not parametric.
By using the difference() function from a larger volume you can make an outer casing to act as a water jacket. You need a jacketed design but at least openscad can help you here. The pulsing is reduced by having more chambers. But detecting a loss of water temp should stop the printer, to avoid gear failure when the wax solidifies. Failure of the heating does not require dismantling, just reheating to clear. So add a dump tank position on the printer. When finished make sure to pump the reservoir out and clear the tubing. Silicon tubing is good to 200C so is ideal for wax and peristaltic flow. A cap on the output would prevent dripping while heating. When the wax is visually melted in the top reservoir then the printer is ready to go. A water jacket around the entire pump which can be continuously fed with hot water to maintain the wax temp (and the wax reservoir above). Horizontally mounted with wax entry from reservoir above with a side entry tube and similar side exit at bottom. The tube which contains the wax, can be pumped (mostly) clear at the end of a run, and can be enveloped in heat using a warm water jacket as well.Ī stepper motor can drive the flow reasonably precisely for your application, especially if geared down (you need a lot of force).
These do suffer from pulsing but the fabric absorption will probably mitigate this and your flow rates are probably low enough to not make this a big problem. Probably the best for your app is the peristaltic style pumps. The moineau (positive displacement pump) would be good but is hard to make. The roots style pump might work but the wax is widely distributed in the housing and you need good sealed bearings to prevent leakage. It will probably also need to be easy to take apart when warm, and clean. or a way to melt the wax in the head so that a cold pump can be rewarmed and work without damage. So you'll either need a pump design that: Melting point is between 46 and 68 ☌ (115 and 154 ☏) depending on formulation.) (Probably you are using paraffin as it is cheapest ? But the wax will melt at a temperature depending on the wax you're using, beeswax, paraffin, microcrystalline. You only need to lay the wax down for absorption by the fabric, so exact dispensing of a volume is probably not as critical as for plastic deposition. Pumping melted wax for batik presents some problems as well as some positive aspects.
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Sent from the OpenSCAD mailing list archive at. My goal is to pump melted wax so that I can draw on fabric as in Batik To use a pair of prefactored gears like from an old laserprinter and to just Therefore sealing will play an important role. You, I guess, want to be able to control a small amount of flow in a linear I easily designed with my gears.scad library One of it uses a pair of herringbone gears which I've also done some gear pump designs which head towards a heart pump for On 24 January 2016 10:24:13 PM AEDT, Parkinbot wrote: Sounds interesting.
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