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General Metalworking - All aspects of working with metal.
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Posted by William B Noble (don't reply t on April 17, 2006, 1:12 am
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I have several vane pumps, that will have excellent flow
characteristics, listed in the vacuum pump section on my web site
(www.wbnoble.com) - mostly, I've offered these to wood turners though
of course anyone is welcome to buy one - there is also a fairly long
and hopefully useful article you can DL from my site (or the tips
section of www.woodturners.org) that will I think tell you all you
need to know about pump technology.
note that when it comes to holding, smaller is the problem, not
larger.
hope this helps
bill
wrote:
>Greetings All,
>I want to get a vacuum pump for both work fixturing and vacuum
>investing/casting. So this post is really metalworking related. I
>would rather buy a used pump in good working order, or one that is
>easily and inexpensively rebuildable. There are many vacuum pumps
>offered surplus and on ebay. I have used them in the past but it was
>always as an employee and now I'm self employed. I imagine the largest
>size item to be held will have a surface area of no more than 288
>square inches. The largest flask, for the forseeable future, will be 4
>inches tall x 4 inches dia. I can imagine needing to pump down a bell
>jar that's 8 inches dia and 12 inches high. With a suitable reservoir
>even a pump with a really low cfm at, say, 28 inches hg would work for
>single castings. But the vacuum chuck may leak a little, and I may
>want to cast several objects in a short time. So I would like some
>brand, cfm rating, vacuum rating, and pricing guidance please. I hope
>that's not asking too much. I have all the stuff for centrifugal
>casting but still need to make room for the casting bench. While
>designing the bench it would be nice if the vacuum pump could be
>incorporated at the same time. My plan is to use piping from the
>casting bench to the machines with the vacuum chuck. The casting bench
>may be on rollers so design is even more important for compactness.
>Thanks,
>Eric
Bill
www.wbnoble.com
to contact me, do not reply to this message,
instead correct this address and use it
will iam_ b_ No ble at msn daught com
*** Posted via a free Usenet account from http://www.teranews.com ***
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Posted by Eric R Snow on April 17, 2006, 10:05 am
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On Sun, 16 Apr 2006 22:12:24 -0700, "William B Noble (don't reply to
>I have several vane pumps, that will have excellent flow
>characteristics, listed in the vacuum pump section on my web site
>(www.wbnoble.com) - mostly, I've offered these to wood turners though
>of course anyone is welcome to buy one - there is also a fairly long
>and hopefully useful article you can DL from my site (or the tips
>section of www.woodturners.org) that will I think tell you all you
>need to know about pump technology.
>
>note that when it comes to holding, smaller is the problem, not
>larger.
>
>hope this helps
>
>bill
>
Thanks Bill, I'll check out your web site. I know that small stuff
has less pressure holding it down, but a large chuck has more
potential leaks that a pump might need to keep up with when sealing
the part to the chuck.
ERS
>
>wrote:
>
>>Greetings All,
>>I want to get a vacuum pump for both work fixturing and vacuum
>>investing/casting. So this post is really metalworking related. I
>>would rather buy a used pump in good working order, or one that is
>>easily and inexpensively rebuildable. There are many vacuum pumps
>>offered surplus and on ebay. I have used them in the past but it was
>>always as an employee and now I'm self employed. I imagine the largest
>>size item to be held will have a surface area of no more than 288
>>square inches. The largest flask, for the forseeable future, will be 4
>>inches tall x 4 inches dia. I can imagine needing to pump down a bell
>>jar that's 8 inches dia and 12 inches high. With a suitable reservoir
>>even a pump with a really low cfm at, say, 28 inches hg would work for
>>single castings. But the vacuum chuck may leak a little, and I may
>>want to cast several objects in a short time. So I would like some
>>brand, cfm rating, vacuum rating, and pricing guidance please. I hope
>>that's not asking too much. I have all the stuff for centrifugal
>>casting but still need to make room for the casting bench. While
>>designing the bench it would be nice if the vacuum pump could be
>>incorporated at the same time. My plan is to use piping from the
>>casting bench to the machines with the vacuum chuck. The casting bench
>>may be on rollers so design is even more important for compactness.
>>Thanks,
>>Eric
>Bill
>
>www.wbnoble.com
>
>to contact me, do not reply to this message,
>instead correct this address and use it
>
>will iam_ b_ No ble at msn daught com
>*** Posted via a free Usenet account from http://www.teranews.com ***
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Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on April 17, 2006, 7:31 am
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> I want to get a vacuum pump for both work fixturing and vacuum
> investing/casting.
Not for work fixturing, but for casting. Because it isn't very
efficient:
<http://www.motor-manufaktur.de/werkstatt/07_vacuum_pumpe/en_index.html>
HTH,
Nick
--
Motor Modelle // Engine Models
<http://www.motor-manufaktur.de>
DIY-DRO // Eigenbau-Digitalanzeige
<http://www.yadro.de>
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Posted by Billy Hiebert on April 17, 2006, 12:09 pm
Please log in for more thread options You might check: http://www.rioGrande.com
They are a jewelry tool and supply source. They have vacuum casting
systems as well as individual components; pumps, bell jars, etc. If
nothing else, you will get an idea of cost and equipment types.
--
Billy Hiebert
HIEBERT SCULPTURE WORKS
Small Part Injection Molding
http://www.hieberts.com
Eric R Snow wrote:
> Greetings All,
> I want to get a vacuum pump for both work fixturing and vacuum
> investing/casting. So this post is really metalworking related. I
> would rather buy a used pump in good working order, or one that is
> easily and inexpensively rebuildable. There are many vacuum pumps
> offered surplus and on ebay. I have used them in the past but it was
> always as an employee and now I'm self employed. I imagine the largest
> size item to be held will have a surface area of no more than 288
> square inches. The largest flask, for the forseeable future, will be 4
> inches tall x 4 inches dia. I can imagine needing to pump down a bell
> jar that's 8 inches dia and 12 inches high. With a suitable reservoir
> even a pump with a really low cfm at, say, 28 inches hg would work for
> single castings. But the vacuum chuck may leak a little, and I may
> want to cast several objects in a short time. So I would like some
> brand, cfm rating, vacuum rating, and pricing guidance please. I hope
> that's not asking too much. I have all the stuff for centrifugal
> casting but still need to make room for the casting bench. While
> designing the bench it would be nice if the vacuum pump could be
> incorporated at the same time. My plan is to use piping from the
> casting bench to the machines with the vacuum chuck. The casting bench
> may be on rollers so design is even more important for compactness.
> Thanks,
> Eric
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>I want to get a vacuum pump for both work fixturing and vacuum
>investing/casting. So this post is really metalworking related. I
>would rather buy a used pump in good working order, or one that is
>easily and inexpensively rebuildable. There are many vacuum pumps
>offered surplus and on ebay. I have used them in the past but it was
>always as an employee and now I'm self employed. I imagine the largest
>size item to be held will have a surface area of no more than 288
>square inches. The largest flask, for the forseeable future, will be 4
>inches tall x 4 inches dia. I can imagine needing to pump down a bell
>jar that's 8 inches dia and 12 inches high. With a suitable reservoir
>even a pump with a really low cfm at, say, 28 inches hg would work for
>single castings. But the vacuum chuck may leak a little, and I may
>want to cast several objects in a short time. So I would like some
>brand, cfm rating, vacuum rating, and pricing guidance please. I hope
>that's not asking too much. I have all the stuff for centrifugal
>casting but still need to make room for the casting bench. While
>designing the bench it would be nice if the vacuum pump could be
>incorporated at the same time. My plan is to use piping from the
>casting bench to the machines with the vacuum chuck. The casting bench
>may be on rollers so design is even more important for compactness.
>Thanks,
>Eric