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How to Build An E-Vac System:

1. Select the E-Vac type.
  A. Determine if the part to be lifted is porous or non-porous.
  B. Select a style - In-Line, Modular or Adjustable. The E-Vac type determines max. vacuum available for lifting the part and vacuum cup selection.

Porous low vacuum generators max. vacuum = 21" Hg (71 kPa)
Non-porous high vacuum generators max. vacuum = 27" Hg (91 kPa)
Adjustable E-Vac vacuum generators max. vacuum = 25" Hg (85 kPa)

2. Determine the weight of the part.
3. Multiply the weight by the vacuum cup safety factor for the total vacuum cup capacity needed.
4. Determine the number of vacuum cups needed by considering the following:
  A. How many cups are needed to distribute the weight for stable lifting and placement?
  B. What is the weight that each vacuum cup can lift based on maximum vacuum available (E-Vac type)?
  C. Select vacuum cups based on max. vacuum available (E-Vac type) and holding weight/cup.
5. To choose an E-Vac model number, consider the entire vacuum system from the E-Vac to the part.
  A. Number of vacuum cups per E-Vac
  B. Length and size of vacuum tubing
  C. Vacuum cup size and type

  • The volume of air to evacuate from your vacuum system and the vacuum flow of the E-Vac you've selected will determine the time it takes from E-Vac activation to vacuum cup holding the part. As the vacuum level in the system increases, the volume of evacuating air decreases.
  • A lower volume of air in the vacuum system and/or a higher capacity (SCFM/SLPM) E-Vac will give faster pick-up times.
  • An exact pick-up time cannot be calculated.
  • If the E-Vac vacuum generator doesn’t meet your needs, return it for a different model, with no restocking charge.

Here is an example using the steps outlined above:
A sheet of material measures 3' x 3' (.91m x .91m) and weighs 25 lbs (11.3kg). Each sheet is in a stack and will be placed on a conveyor.

If it is porous like wood and positioned vertically:

1. Choose a porous, low vacuum E-Vac. In this case the Modular style will be used for easy mounting. The maximum vacuum is 21" Hg (71 kPa).
2. The weight is 25 lbs (11.3kg).
3. Since the part is picked-up and hung on an overhead conveyor vertically, the safety factor is 4. The vacuum cup capacity needed is 4 x 25 = 100 lbs (45.4kg).
4. Four vacuum cups will be used for stability when lifting the sheet. Each cup will need at least a 25 lb (11.3kg) capacity. The Model 900755 Vacuum Cup will hold up to 25.3 lbs (11.5kg) at 21" Hg (71kPa).
5. There are 4 small round vacuum cups that are positioned close to one another. The vacuum system has a small to medium volume and pick-up and release time is not critical. To reduce the sound level, use the straight through muffler.
Order: (1) Model 820008M Modular E-Vac; (4) Model 900755 Vacuum Cups

            

If it is non-porous like glass and positioned horizontally:

1. Choose a non-porous, high vacuum E-Vac. In this case the Modular style will be used for easy mounting. The maximum vacuum is 27" Hg (91 kPa).
2. The weight is 25 lbs (11.3kg).
3. Since the part is picked-up and placed on a belt conveyor horizontally, the safety factor is 2. The vacuum cup capacity needed is 2 x 25 = 50 lbs (22.7kg).
4. Four vacuum cups will be used for stability when lifting the sheet. Each cup will need at least a 12.5 lb (5.7kg) capacity. The Model 900754 Vacuum Cup will hold up to 20.8 lbs (9.4kg) at 27" Hg (91 kPa).
5. There are 4 small round vacuum cups that are positioned close to one another. The vacuum system has a small to medium volume and pick-up and release time is not critical. To reduce the sound level, use the straight through muffler.
Order: (1) Model 830006M Modular E-Vac; (4) Model 900754 Vacuum Cups


NOTE:
The Model 840008M Adjustable E-Vac can be substituted for picking up the wood or the glass since the vacuum level and vacuum flow is easily adjusted to suit the porous or non-porous application. The Adjustable E-Vac is especially useful for loads that vary.


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