I love the fact that you show all of your mistakes and failures with your experimenting. The real life issues arise for all of us that are makers. Good stuff keep it up.
If the motor was designed with the need for a cooling fan I believe you may have problems with overheating if it is placed in a vacuum, but I haven't tried this. Once you have a vacuum you'll be limited to radiative instead of convective cooling. Here in the USA we have several chains of auto parts retailers that sell generic things like oil/air filters, fluids, and such. Most of them have a tool loaning service for specialty tools. You basically pay the cost of the tool, and get your money back upon return. Most of these stores have a proper air conditioner evacuation vacuum pump they will loan you. That's a decent vacuum pump setup. They will probably ask a bunch of questions and try to sell you something as well, but just tell them your bother has all the stuff and just sent you to pick up a pump for him to fix your car. Just play dumb if they keep on. If you like the results from that setup, you can basically keep it or they can order you a new one from the store. I think you may find there is an issue with duty cycles in this application when it comes to the pump. I think it's very difficult to create a good vacuum seal without professionally designed hardware. I think most people use a pump that can maintain vacuum continuously/cyclically in applications like vacuum bags. The problem then becomes the motor's duty cycle limitations. If the motor is over stressed it will burn a winding rather quickly. I have a vacuum pump that was used in an appliance for molding shimano cycling shoes. The proper pumps are really beefy and usually covered in cooling fins and aluminum if they are intended to work for long periods of continuous use. The one I have was intended to last years while working for 20-40 minutes of continuous use. I forget the actual brand of the pump. It wore out after many years. I kept it after shimano sent a new setup for one of the shops I worked for. These pumps can be rebuilt with easily sourced parts kits. If you want a pressure container, used pressure cookers are probably cheaper than that tupperware was if you can find one at a second hand thrift store. GL :-) -Jake
This inflator thing says not to run it more than fifteen minutes at a time, that's with the fan and in normal atmosphere. I figure that for the low volume of air I need to expel, and if a decent seal can be held, hopefully should be enough to run it for only a minute at a time. It will help to make the enclosure as small as possible so it doesn't waste time pumping 'itself' empty first.
So cool...our brains work the same way (only yours works much better :-) This is SO like something I would spend a Saturday working on. Every time I see you've posted a new video it's like someone placed a gourmet meal in front on me. Love it man! Keep 'em coming!
The piston top valve is known as a reed valve. Good decision not to bend it as that would have destroyed it for ever. You can get a strip cell protector for the 18650 from Ebay really cheap. As I've said earlier on another video, compressors do not necessarily work as vacuum pumps. Massive amounts of vacuum are not required to do the epoxy wings. Around 2 inches of vacuum are sufficient so long as it is supplied over the length of time for the epoxy to cure. We found long ago a bleed valve is the best choice for that (tee valve). It allows the vac pump to work at max with full airflow for cooling and the tee bleeds just a small amount of the vacuum to the wing bag. First wing we did using my old vac pump from the 1950's, the 30" vacuum crushed the wing cores in the first few minutes. And it was old, used a hot wire relay on the motor start.
Yeah somebody was saying on my other video, talking about composite bicycle frames, that the level of vacuum was also quite important for getting a good balance of resin. I'm thinking 10-12 inches looks like plenty for what I'm doing.
@@iforce2d maybe but we found 2" to be more than enough. Ebay in Aus has a single stage vac pump for around $80.00.(have seen them cheaper also) Don't know if they have similar in NZ or not. I use a 2 stage unit here for ac splits but you wouldn't need anything like that. As I mentioned, you can adjust the "flow" rate with a tee type bypass tap. www.ebay.com.au/itm/Single-Stage-2-5-CFM-REFRIGERATION-AIR-CONDITIONING-VACUUM-PUMP-VAC-PUMP-AU/302951077949?hash=item46894a983d:g:gNkAAOSwVzRasMZg&frcectupt=true
I have a spare fridge compressor you can have to convert into a vac pump if you want it. I use another one for fibreglassing, they work well. I use mine with a mains pressure switch to maintain a vac pressure over time
Use glass jar? Just wrap it in some bag in case of implosion. You can screw some pneumatic connectors to its lid just like ones in 3d printers for bowden tube
Glass jar seems to work ok, drilling it probably a pain in the ass though: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JksUmIwLLgM.html Looking into a PVC pipe possibility next...
Vacuum sealing food was fashionable a decade or two ago. There may be products worth grabbing even though at first glance they look at bit...naff now. What if bladders in the wing could be inflated to change the aerofoil chord shape as a flight control surface.
I did something similar using a manual bike pump and a PVC rainwater pipe (20CM Diameter, about 1 m long). You can buy the right endcaps for the pipes at the hardware store together with the pipe. They hold vacuum very well. I use it for vacuum bagging wings. Goes up to 0.1 or 0.05 bar or so (lots of manual pumping!) and easily keeps that for 24Hrs.
Similar unit called the Air Dragon that was only good for about 3 or 4 uses before it stopped working. Got it as a gift, otherwise I probably wouldn't have had it. Not sure if anyone would want it for the price of postage? (No battery, just had wire going to car lighter.) I found a half-decent cheapie air pump sold under the Slime (tire sealant) brand. (Has the electronic reading with the flashlight on the side.) Seems better than those drill-shaped things.
Seems like a section of Schedule 40, 6" or 8" (however big you need to fit the pump) pressure rated PVC pipe with a couple of end caps would be a good option for something like this. People use it to make potato guns and the like all the time.
You mean implode due to vacuum, or explode from positive pressure? Seems like if the end caps are being pressed on by vacuum they would be unlikely to cave in...
@@iforce2d in my case it was explode because of positive pressure. The outer ring of the cap was still on the pressure rated pvc pipe since that was stuck with pvc cement. The flat top part was gone in a lot of pieces. Wouldn't a negative pressure do the same and cause an implosion? I was working with less than 2 bar. Never found caps that had the same pressure rating as the pipes. But than could be because the little island I lived on just didn't have that much inventory...
Put a relay on the arduino and a pot to comtrole a setpoint. You can have a self governing vacume system that will sich on and off to manage the vacume.
@@iforce2d when doing my booby wing pieces i just make sure to press out as much air as i can before sealing the other end of the bag and i have to wait a minute for it to vacuum down but thats no big deal. Have you seen the skateboard hand pump vacuum bags? I had thought of trying those, some guys use the food vacuum sealers with success as well.
They are slightly shorter than my other ones, so I think unprotected. I guess the 500mA max current and 12.6v max voltage kinda takes care of the charging ok... I hope.
5:27... It is called a reed valve... 7:07... It is called a Push On/Push Off button switch 7:38... you said that the Charger had a 12.6V output. Lithium Ion cell are fully charged at 4.2V per cell. 4.2V X 3 =12.6V. So the charge current would reach near 0 mA when fully charged. The only downside that I can see is that the cells are not Balance Charged. 15:46... I would suggest a cylindrical metal container... not a flat sided container.
This product works great especially for motorcycles, I also use it on my ford 150, I would buy another one, not sure why your making a kiddy toy out of it.
Experimenting is not wasting time. I could just buy a pre-built plane instead of making my own too, but that would be boooooring. I actually bought a fridge compressor last week, no reason not to play around with this too though :)
@@iforce2d Experimentation is great. :-) You probably already know this, but those fridge pumps tend to mist oil into the air while they're running. You'll want to rig up a trap for the oil, both so that it doesn't get on every surface of your shop, and so you can put it back into the pump, which needs it. Loving your channel! When is the VSP tutorial coming? ;-)
