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Couple of thoughts... you could pick up some efficiency on your HEX by switching to copper, and or in conjunction with that (use compression fittings not solder) use several smaller pipes vs one big one to get more surface area in the fire box. Another option would be to use double wall pipe (or put 4 inch inside 6 inch pipe) for your hot air return... you're going to lose a ton of heat as the outside temperature drops, which will make it progressively harder to get heat into your shop. Another option is instead of hot air, why not do a liquid system and a radiator. It doesn't need to be under pressure, or a lot at least, but it would be significantly more efficient than an air to air system.Neat project none the less.
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Did I miss the final product operation video?
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You really store this stuff in cement jars?
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Rewinding 3 Phase Motor
Very nice write up. I was just in a commercial motor build rebuild shop a month ago, and I have to be honest, your explanation was just as good, if not better, than that which I got from the motor house. This is coming from an electrical engineer. I am truly impressed, as this is probably one of the most difficult tasks someone could ever take on!
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Best way to cool the motor would be to use a fan, just like railroad locomotives do. They call it the traction motor blower. It's a squirrel cage fan that blows filtered air down from the body to the axle mounted motors. Here, you could mount the fan on the motor, or put it on the side of the frame next to it. The end bells already have air holes, so you'd blow it in one end and out the other. Myself I'd go from the solid end to the chain side, but I'd remove the screen to reduce air restriction and probably enlarge the holes by 50% or so. Next question is what blower to use. I'd go with as high a dc voltage as I could find, or build a chopper for it to use a 12V motor off the 48V so it doesn't present as much a load. A squirrel cage blower would be a better choice than an axial flow fa...
Best way to cool the motor would be to use a fan, just like railroad locomotives do. They call it the traction motor blower. It's a squirrel cage fan that blows filtered air down from the body to the axle mounted motors. Here, you could mount the fan on the motor, or put it on the side of the frame next to it. The end bells already have air holes, so you'd blow it in one end and out the other. Myself I'd go from the solid end to the chain side, but I'd remove the screen to reduce air restriction and probably enlarge the holes by 50% or so. Next question is what blower to use. I'd go with as high a dc voltage as I could find, or build a chopper for it to use a 12V motor off the 48V so it doesn't present as much a load. A squirrel cage blower would be a better choice than an axial flow fan... better flow rate, better pressure capability and less noise. I have one of these motors for a project with a foot pedal controller, I haven't put it all together yet though, but this relights the fire to get it started.
How do you handle drift of the sensors over time? I know our 4 gas meters we use for the fire department require calibration every year or so, otherwise you get a lot of false information. Neat project though!
Do you guys have an air conditioner for summer, or is where you're at generally cool/dry enough that it isn't necessary? I suppose you could do a chilled water loop, but then you'd need ceiling fans to move the cool air off the floor. Nice looking system!
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Any video of it working?
Not in a 3 phase system. You're thinking of the center tap of a regular household single phase system. In 3 phase, each phase is offset from the next by 120 electrical degrees, so current is actually supposed to flow between A and B, B and C and C and A. If the system is operating correctly, there really shouldn't be any current in the ground at all. Failing that, what you're describing is a grounded wye system, there is also a delta, which has no connection to ground. It has it's own unique characteristics as it can 'float' to some offset potential if things aren't correct.
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You can always use that almond liquor in coffee or other iced drinks. If you like a good Martini, try equal portions of khalua (or some other coffee liquor), your almond stuff (or frangelico, what I used) and pinnacle whipped vodka, or just a good clean neutral flavored vodka. Shake all three over ice, and serve in a chilled martini glass. Warning, it packs a punch.
Are you sure the arm supporting the work isn't deforming when it moves down through the resin? I noticed the hollow objects aren't square, but skewed which makes me think this is a mechanical problem. Make sure the bed moves smoothly and clean, any misalignment of the bed or movement will be transmitted into the object being printed.