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re vac forming
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In a message dated 6/15/99 7:40:02 PM SA Eastern Standard Time,
footman@... writes: << if you are looking for a good vac source, go to a local dairy farmer (if you have any around) - apparently the pumps they use for their milking machines can be easily modified - also, how thick is the silicone membrane you are using - obviously the thinner the material, the more intimate it will be against the mold >> Thanks Chris, I am using a rubber strip around the perimeter top edge of the perforated table. The rubber strip is the stuff you purchase here in Chicago for weeather proofing doors. About 1/16" in thickness by 1/2 " wide, works fine once you get the frame lined up with the table. I have seen photos of vac forming machines with a hand pump mounted on the vacuum box, similar to the ones used for inflating bicycle tires the type you would stand on with your two feet, with a T handle. I'd like to know how this is installed and how it operates, not sure how it all works with a shop vac, does it draw more vacum after the shop vac is turned on? More info on this set up would be greatly appreciated. Anyone? Thanks, Mario |
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In a message dated 6/16/99 12:42:58 AM SA Eastern Standard Time,
janders@... writes: << Rough pumping can be done with a vacuum, and if you want to achieve higher levels of vacuum, you can make a vacuum pump out of an automotive air conditioning pump. If you have a gage and can tell how much vacuum the shop vac can pull, you can run both at the same time and valve off the shop vac once you hit it's limit. If you don't, the other pump will be working against it. >> Any suggestions on buiding the pump with meter, sources for the meters, hardware etc.? I have a used empty helium tank the type you buy at Toys R- Us, the instruction s that come with the tank says it can not be used to refill, can this tank be used for air/vacuum tank? How? Thanks, Mario |
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Thanks Tim,
My own search brought me to an excellent source of publications for making hard to find items such as Injection molding, vac forming machines, etc, etc. Lindsay Publications. The flyer I have its Called, Secrets. (815) 935-5353. It includes the book by Douglas E. Walsh. For anyone else interested in making theuir own stuff, this is an ecellent source. Mario |
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Jon Anderson
Rough pumping can be done with a vacuum, and if you want to achieve
higher levels of vacuum, you can make a vacuum pump out of an automotive air conditioning pump. If you have a gage and can tell how much vacuum the shop vac can pull, you can run both at the same time and valve off the shop vac once you hit it's limit. If you don't, the other pump will be working against it. Jon |
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Tim Goldstein
Mario,
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I looked in Don Ross's newest book "Flying Models Rubber, CO2, Electric, & Micro Radio" and he has some pictures and explanation about a vacuum forming machine / kit made by Douglas E. Walsh, 272 Morganhill Rd., Lake orion, MI 48360. Looks like a very nice setup and it can be gotten as a 2 stage unit. I searched for a number on the ATT web site and got what looks to be a direct match with a phone number of 248 391 8290. Hope it helps, Tim [Denver, CO] -----Original Message----- |
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Jon Anderson
MIADsgns@... wrote:
Any suggestions on buiding the pump with meter, sources forI don't see any reason you can't use that tank as a vacuum plenum. Don't know how many inches of vacuum you can pull with a shop vac, but the tank will help with volume. Valving to take the shop vac out of the loop could be a simple PVC ball valve from the hardware store. Costs should be reasonable. Used ought to work just fine if you can find it. You can tolerate a slight leak here, you just don't want a high vacuum/low cfm pump trying to suck air back through the shop vac while it's running. Some old friends have a business in town (Maier USA) making accessories for dirt bikes and ATV's, vacuum forming plastic. It's a trip watching a droopy sheet of plastic turn into an ATV seatbase/fender in a matter of seconds! Their Thermwood 5 axis gantry router is pretty neat too... Jon |
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Tim Goldstein
Sort of funny you mentioned Lindsay Publication. I just got their catalog
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yesterday and have been looking through it to see what books I want to get on my first order. Tim [Denver, CO] -----Original Message----- |
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Tim Goldstein
I have done some composite wing vacuum bagging and used one of the old
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commercial freon tanks as a vacuum reservoir and it held 24" hg no problem. I now use a section of 4" PVC pipe with endcaps for my vacuum tank and I have tested it to 24" hg with no problems. Tim [Denver, CO] -----Original Message----- |
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In a message dated 6/16/99 2:36:14 AM SA Eastern Standard Time,
timg@... writes: << I have done some composite wing vacuum bagging and used one of the old commercial freon tanks as a vacuum reservoir and it held 24" hg no problem. I now use a section of 4" PVC pipe with endcaps for my vacuum tank and I have tested it to 24" hg with no problems. >> Ok now you are getting me creative :), how about a cacuum system using PVC tubing including the reservoir tank, lines, What is hg? and can you give me an idea what the 24" hg translates to? Please bare with me I don't have much experience with vacuum systems so I am learning. Thanks, Mario |
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Thaks to all who responded and are contributing to this vac forming thread.
Does anyone have a detailed drawing or diagram for a home vac forming machine. I am interested in all the connections for the pump, dials, gauges, pressure switches, valves air tank, etc. Can a Home Depo bought compressor/tank be used for vacuum? I am trying to visualize this equipment and its mechanics with my perforated vac forming box (20"x20"x4") which up until now I have been using with a small shop vac using my kitchen stove as the heat source for softening the plastic sheet. I am thinking I may have to do the vac forming myself after all if I do not find someone to do it inexpensively. Thanks, Mario (Chicago) |
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