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General Metalworking - All aspects of working with metal.
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Posted by Eric R Snow on April 16, 2006, 7:30 pm
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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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Posted by Richard J Kinch on April 17, 2006, 12:44 am
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Eric R Snow writes:
> With a suitable reservoir
> even a pump with a really low cfm at, say, 28 inches hg would work for
> single castings.
Has anyone measured the ultimate pull with the $9 Harbor Freight item:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3952
Assuming you have shop air, this is quite an effective little gadget, and
it might just meet your 28 inch spec.
I have an expensive 50-micron 10 cfm HVAC vacuum pump, but I still use the
little red Chinese toy when it meets the need. Pump oil is costly and
short-lived.
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Posted by Eric R Snow on April 17, 2006, 10:03 am
Please log in for more thread options On Sun, 16 Apr 2006 23:44:05 -0500, Richard J Kinch
>Eric R Snow writes:
>
>> With a suitable reservoir
>> even a pump with a really low cfm at, say, 28 inches hg would work for
>> single castings.
>
>Has anyone measured the ultimate pull with the $9 Harbor Freight item:
>
> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3952
>
>Assuming you have shop air, this is quite an effective little gadget, and
>it might just meet your 28 inch spec.
>
>I have an expensive 50-micron 10 cfm HVAC vacuum pump, but I still use the
>little red Chinese toy when it meets the need. Pump oil is costly and
>short-lived.
Greetings Richard,
Thanks for the reply, but I really want something quieter and more
efficient. For only once in a while use that HF item would be really
useful.
ERS
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Posted by Ignoramus22652 on April 17, 2006, 10:42 am
Please log in for more thread options Good vacuum pumps are not that expensive. I bought a Sargent Welch 1
cfm pump for only $39 on ebay. it was a local purchase. Works
perfectly and is very quiet.
i
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Posted by Rex B on April 17, 2006, 10:53 am
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Richard J Kinch wrote:
> Eric R Snow writes:
>
>> With a suitable reservoir
>> even a pump with a really low cfm at, say, 28 inches hg would work for
>> single castings.
>
> Has anyone measured the ultimate pull with the $9 Harbor Freight item:
>
> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3952
>
> Assuming you have shop air, this is quite an effective little gadget, and
> it might just meet your 28 inch spec.
>
> I have an expensive 50-micron 10 cfm HVAC vacuum pump, but I still use the
> little red Chinese toy when it meets the need. Pump oil is costly and
> short-lived.
I bought one of those just to experiment with. Sure is noisy, but I
don't know that I ever used it with a load. With the posts open and
unconnected, with air applied, and the Crapsman oilless compressor
running, dogs 3 blocks away were running in circles and biting their
tails ;)
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> even a pump with a really low cfm at, say, 28 inches hg would work for
> single castings.