Results 1 to 9 of 9

Thread: Will this work ??

  1. #1
    Join Date
    Jul 2009
    Location
    Amherst, New Hampshire
    Posts
    10,536

    Will this work ??

    All I need to put together a stabilizing pot is a vacuum pump.
    Will this one draw down enough ??

    http://www.harborfreight.com/25-cfm-...mp-98076.html#
    Faith, Hope & Charity

  2. #2
    Join Date
    Mar 2007
    Location
    Escondido, CA
    Posts
    4,996
    Yes. The CFM rating is just a time factor. More important is how well it holds the vacuum and for how long. That has more to do with the plumbing you provide to your stabilizing pot. I would love to know what 'draws down to 2 microns' means. Is not a micron a size of a particle? What does that have to do with air, since that is what a vacuum pump draws out? How can that relate to pressure, in the case of vacuum, inches of mercury? Somebody enlighten me?
    ++++++

    Some say the land of milk and honey; others say the land of fruits and nuts. All together my sort of heaven.

    Power is not taken. It is given. Who have you given yours to? Hmmmm?

    Carol Reed

  3. #3
    Join Date
    Apr 2008
    Location
    Independence MO
    Posts
    523
    Micron's are the size of particles. Where these pumps have been sold for, and used for years, is in a/c work. They are used to draw down the system, and check how it holds a vacuum, while pulling contaminants from the system (typically, bits of failed o rings in car systems). That is where the micron rating comes into play, IMHE.

  4. #4
    Join Date
    Jul 2009
    Location
    Amherst, New Hampshire
    Posts
    10,536
    When we used it as a pressure pot it would hold 75 psi for a real long time. I really cant remember so I'll pull it out and check it again. Haven't used it in quite awhile. I think it was at least overnight or longer. We used to cast Alumilite I think.
    My son did most of it.
    Faith, Hope & Charity

  5. #5
    Join Date
    Nov 2012
    Location
    Wapakoneta, OH
    Posts
    574
    The way that ad reads is the pressure is measured in microns; which doesn't make any sense.......maybe it's just a bad Chinese translation?
    I long for the days when Coke was a cola and a joint was a bad place to be (Merle Haggard; 1939-2016)

  6. #6
    Join Date
    May 2007
    Location
    Thomasville, GA
    Posts
    5,656
    Quote Originally Posted by fred hargis View Post
    The way that ad reads is the pressure is measured in microns; which doesn't make any sense.......maybe it's just a bad Chinese translation?
    Here's a conversion chart that explains it.
    Bill Arnold
    Citizen of Texas residing in Georgia.
    NRA Life Member
    Member of Mensa
    Live every day like it's your last, but don't forget to stop and smell the roses.

  7. #7
    Join Date
    Mar 2007
    Location
    Escondido, CA
    Posts
    4,996
    Thanks, Bill. Now that makes more sense. Have downloaded and saved that chart.

    So to Bob's question, two issues with the subject pump; one is the pump itself and the other is the motor. The reviews were very positive so maybe this is diamond in the rough at HF. It ought to work in his application.
    ++++++

    Some say the land of milk and honey; others say the land of fruits and nuts. All together my sort of heaven.

    Power is not taken. It is given. Who have you given yours to? Hmmmm?

    Carol Reed

  8. #8
    Join Date
    Jun 2008
    Location
    GTA Ontario Canada
    Posts
    11,972
    Thanks from me too Bill, learnt something too. Like Carol i thought vacuum was only measured in mmHg or imperial equiv.

    Sent from my SGH-I337M using Tapatalk
    cheers

  9. #9
    Pressure is not measured in microns. The word micron on the chart is a sloppy abbreviation for microns of Hg. As Carol pointed out mmHg is correct for pressure, only this unit is 0.001 of a mmHg. Micron may possibly be used for pressure in the field of air conditioning. However, being a unit of length it is only describing the length of the column of mercury it is displacing at 0 C. Hence it is measuring pessure.

    All the confusion comes from the abbreviation. I have a buck that says any one measuring the vacuum in AC lines in Microns has forgotten...... the rest of the story.

    Does this give you closure? I hope so!

Similar Threads

  1. Not my work...
    By Roger Tulk in forum Flatwork Project Showcase
    Replies: 6
    Last Post: 08-03-2014, 09:42 PM
  2. How does this work?
    By Ryan Mooney in forum Off Topic Discussion
    Replies: 10
    Last Post: 10-17-2012, 09:08 PM
  3. This elf's got his work cut out for him
    By Paul Hubbman in forum Off Topic Discussion
    Replies: 4
    Last Post: 12-17-2008, 11:58 PM
  4. Here's some of my work
    By Kenneth Lasota in forum Lathe Project Showcase
    Replies: 13
    Last Post: 03-21-2007, 03:05 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •