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| Vacuum pump or my maddest modding project yet. |
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| picclock:
Hi Henning Vacuum pumps often have a limited flow rate which is why this may be deemed unsuitable. However you just need to get an empty gas cylinder (say butane/propane and definitely empty like with brass valve removed) and connect the output of the pump to it to form a vacuum reservoir. Then when you apply the vacuum the pressure will stay low long enough despite the inevitable leaks to complete the forming successfully. I have a machine which generates its own vacuum from a compressed air supply and a venturi arrangement which also seems to work quite well. Best Regards picclock |
| Henning:
--- Quote from: DaveH on October 25, 2011, 04:39:04 PM ---Hi, 15torr = 20mbar. Because 1torr = 1.333mbar = 1mmHg (near enough) :beer: DaveH PS. 1 Standard Atmos = 760torr = 760mmHg =1013mbar --- End quote --- That would actually be quite a lot of vacuum. i've been thinking the wrong way :Doh: Thank you very much! |
| Henning:
--- Quote from: picclock on October 25, 2011, 05:46:30 PM ---Hi Henning Vacuum pumps often have a limited flow rate which is why this may be deemed unsuitable. However you just need to get an empty gas cylinder (say butane/propane and definitely empty like with brass valve removed) and connect the output of the pump to it to form a vacuum reservoir. Then when you apply the vacuum the pressure will stay low long enough despite the inevitable leaks to complete the forming successfully. I have a machine which generates its own vacuum from a compressed air supply and a venturi arrangement which also seems to work quite well. Best Regards picclock --- End quote --- My thinking yesterday evening was along the lines of this. If i add a vacuum switch and a tank, i will be able to run up vacuum and then let it off without pressure in the system and with the pump turning off. In addition, for vacuum clamping i may be able to utilize the pressure in the tank without having to start the pump? Thank you very much all of you who have replied so far! I appreciate it! Here's a couple pic's from yesterday when i took of the motor to see if it could be traded for a single phase: Stubborn gear: Had me bring out the "if it doesn't want to budge, i'll make it"- kit: |
| DaveH:
--- Quote from: Henning on October 26, 2011, 02:44:16 AM ---That would actually be quite a lot of vacuum. Thank you very much! --- End quote --- Hey that's quite good - a lot of nothing :) :) :) :beer: DaveH |
| Henning:
--- Quote from: DaveH on October 26, 2011, 10:32:03 AM --- --- Quote from: Henning on October 26, 2011, 02:44:16 AM ---That would actually be quite a lot of vacuum. Thank you very much! --- End quote --- Hey that's quite good - a lot of nothing :) :) :) :beer: DaveH --- End quote --- Not allowed to make fun of non-native speakers :hammer: :D :) :beer: After a lot of thinking (probably due to a bad case of :proj:) about this project i decided yesterday to use a capacitor and run the 3- phase motor directly from my single phase, not least to get some progress. I got it figured out and had it running yesterday evening. Then i built a small cart for it, which will be upgraded with panels to hold quick couplings, wiring etc. in due course. Here's where we are now: I'm going to see if i can get some more bits tonight and start on the elecktrickery part. Need a box of some sort to hold the cable connectors and capacitor first, though. And a 24V power supply... |
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