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DIY Vacuum Press

    Do It Yourself Vacuum Press

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Vacuum Pump - Gast 1.1 CFM
120 VAC
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Regular Price:
$329.99
Your Price:
$259.00   ($70.99 Savings!)
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Product Description


This is a 120v Gast continuous duty vacuum pump for building a vacuum veneer press. Gast is one of the leaders of vacuum pump technologies. This particular pump one of their most quiet and reliable units.

Features

  • Gast Model: DOA-V722-AA or DOA-P701-AA
  • Fan cooled 120v AC operation, thermally protected and UL listed
  • Running Amps: 4.2
  • No start or run capacitor required
  • 1.1 CFM of air flow at 0"Hg - ideal for small and medium sized bags
  • Maximum vacuum - 25" of hg at sea level
  • Total Bag Pressure: 1750 lbs/sqr ft
  • Oil-free operation - Clean and quiet
  • Attached cord and A/C plug end
  • Port size: 1/4 NPT
  • Includes an exhaust muffler to minimize pump sound
  • Made in the USA
  • 1 Year manufacturer's warranty
  • Weight: 11 lbs. (approximately)
  • Sound Rating: 45 dB



What is the warranty on this pump?
Gast Manufacturing Inc. warrants this item to be free of defects in material and workmanship for a period of 1 year. Please contact us for more information.

What is the model of this pump?
Gast Model: DOA-V722-AA or DOA-P701-AA These are both the same pump with the same specifications and performance. The only difference is the location of the vacuum port and pressure port. We may ship either model but we have a special arrangement with Gast in which our pump's vacuum port is always over the motor of the pump. Again, both pumps have the same performance, same motor, same plug, same dimensions, and same noise level.

Can this pump be used for vacuum chucking?
There is no safe way to answer this question. More information needs to be provided. You would need to know three things...

  1. What is the surface area where the chuck attaches to the project?
  2. Is the project material porous? (some species of wood are very porous)
  3. How much weight will be held on the chuck at turning speed?

With these bits of information, you can calculate a number that will help you determine if the pump is safe to use for chucking. Continue on to the next question.

How much clamping force will the pump create for vacuum chucking?
This is based on a calculation using the maximum sustainable vacuum level and the surface area where the project is attached to the chuck. A smaller attachment area means less clamping/chucking force. A large industrial pump capable of pulling a very high vacuum may not be suitable for chucking if the vacuum surface area of the project is small. You have to calculate the vacuum surface area on your project first. Then determine what amount of vacuum you are capable of applying to the project. With this information, you can determine the total clamping force on the project and consider whether or not it is enough to safely hold your project while it is being turned. Here is the method for calculating the clamping force.

  1. Determine the surface area of the vacuum attachment point. In most cases, the vacuum chuck will be circular so use Pi (roughly 3.14) to determine this number. The formula starts by taking the diameter and dividing by two. This gives you the radius. Then multiply the radius by 3.14 and then multiply it again by the radius. Let's use a chuck diameter of 6" and determine the surface area. Divide 6 by 2. That makes 3 so then multiply 3 times 3.14 (Pi), then multiply that again by 3.
    -
    6 ÷ 2 = 3
    3 x 3.14 = 9.42
    3 x 9.42 = 28.26

    -
    So here we have 28.26 square inches in a 6" diameter chucking surface.
    -
  2. Determine the maximum sustainable vacuum level that you can reach with your project piece attached to the vacuum chuck simply by placing it on the chuck and turning on your vacuum pump. A non-porous material that is chucked to your lathe will typically achieve the same level of maximum vacuum that your pump is capable of achieving. In other words, the project material itself allows no loss of vacuum therefor the pump will achieve its best available vacuum.
    -
    In the following example let's assume that the project material is non-porous and that the pump can generate 25" of Hg. For every inch of Hg vacuum, you get .49 lbs per square inch of pressure. Multiply .49 by the vacuum level that the pump can create.

    .49 x 25 = 12.25 (this is how much pressure in pounds that you are getting per square inch)
    -
  3. Multiply 28.26 x 12.25 to get 346.19 lbs of force holding your project to the lathe.
    -
  4. Now only you can decide if that is enough chucking force to safely hold your project.

What if the chucking project is porous? How do I determine if this pump is suitable?
Unfortunately, there is no way to determine this without actually placing the project on a vacuum chuck. You would need to determine the actual maximum sustainable vacuum and this will vary across each project you try out depending on the size and porosity of the material.

What pump do you recommend for vacuum chucking?
I can only suggest one thing... the bigger, the better. Several of our customers are using 3 CFM vacuum sources for chucking but most are opting for 5 CFM vacuum sources.


Product Reviews

  1. Review from Townville, SC

    Review by Randy Bolt
    Rating:

    Well I'm back with a follow up. This pump is rock solid. I have run thousands of parts using this pump without a glitch. A great purchase.


  2. Review fom Townville, SC

    Review by Randy Bolt
    Rating:

    Replaced a venturi pump with this one on a machining center grid type vacuum chuck to take some load off my air compressor.
    At 650 feet above sea level I get about 23.5 inches Hg the first minute. Not quite as deep my 27 inches on the venturi. The gauge is + or - either 6% or 10% so the numbers don't mean much except lower than the single stage venturi. My cycle times are less than 3 minutes and this adequate for me. I'm evacuating less than 4 cubic inches.

    I can't believe how quiet this unit is, half as loud as my air conditioner and no where as loud as the venturi even with the special muffler. Doesn't walk across the concrete floor with no mounts. Comes with 4 each 10-32 tapped holes on bottom and instructions require anti vibration mounts. I'll probably get some.

    Maybe 3 months before I run this 2 day job again so I can't say much more until then. But so far I am very pleased!


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