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Thread: Vacuum Pump?
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5th September 2013, 09:09 AM #16
Smiife how much vacuum do they pull? the best I have seen with reasonable volume has been around 46% which I would have thought be a bit low.
If you do go for a full blown vac pump you and dont buy top end of the market [ which is expensive ] then you will need to fit a small bleed valve to prevent pump damage.Inspiration exists, but it has to find you working. — Pablo Picasso
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5th September 2013, 12:19 PM #17Senior Member
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You could try this one:
Air Operated Powered Vacuum Pump Venturi System Power Vacumm | eBay.
Cheap enough to experiment with and says it will achieve 28" Hg (about 40 Torr or 90% vacuum) . The down side to venturi is the noise from your compressor.
Refrigeration pumps are ok. They don't pump refrigerant but are used to evacuate the system before charging. This one:
3 CFM Single Stage Rotary Vane Vacuum Pump R410A R134 HVAC A C Air Refrigerant | eBay
reckons it can achieve 5 mBar (about 95% vacuum). I've used similar to this in spectroscopy systems.
I wonder how much difference the higher vacuum makes given that 100% vacuum means 14psi (~1kg/cm2). For a 7.5cm circular chuck that's 44kg holding the job to the chuck or 22kg @ 50% vacuum. Would have thought that even 50% vacuum would be overkill for most work (and maybe even destructive in some instances).
Anyway, I'd be interested to see how you go as I've been thinking about doing the same thing.
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5th September 2013, 12:25 PM #18GOLD MEMBER
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Recon medical vacuum pumps come up occasionally on the Aust/NZ luthiers forum. Very good quality.
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5th September 2013, 03:38 PM #19
Vacuum cleaners work Ok but are noisy. Vacuum pumps work, but care needs to be taken especially with thin walled objects, full vacuum can collapse the timber object.
Neil____________________________________________Every day presents an opportunity to learn something new
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5th September 2013, 05:29 PM #20GOLD MEMBER
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My vacuum pump, bought on ebay is rated at 4.2cfm and as others have said ,it is a pump to evacuate refrigerent lines not to pump refrigerent.I also found that buying the various pipe connections cost about the same as the cost of the pump.It was some time ago and I think about $300 all up.Have a look at TTIT's web site I think he has details of his vacuum system there. I got most of my information from him.
Ted
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5th September 2013, 09:20 PM #21
hi guys,
sorry i have not replied earlier,work keeps getting in the way of my hobby
the system i have is a ''holdfast'' vacuum generator,not sure of the technical
jargon but it pulls 20+in Hg,and the ''safe'' minimum is 12 in Hg,not sure what
that all means but i have never lost a piece yet,there web site is ,TMI Products woodturning tools cyanoacrylate adhesive sharpen gouge vacuum chuck hollowing carbide
sorry i am not sure how to do the linky thing!!!!!!!!!!
i am sure if you have a compressor already ,this is a good way to go
i will get some photos together on the weekend and send them
or post on here,as i have said this week has been a bit busy
cheers smiife
p.s. not sure how the link came up,but it is there now
just went on the website,and remembered i got it from craft supplies usa
went on there site and they are selling for $160.00
hope this info helps,i would recommend this system to anyone
certainly works wellLast edited by smiife; 5th September 2013 at 09:33 PM. Reason: adding more info
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5th September 2013, 10:26 PM #22
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5th September 2013, 11:23 PM #23Senior Member
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I bought myself one of those 4 cubic ft/min 2 stage vacuum pumps off ebay a few years ago when I wanted to do some fibreglass infusion molding and just connected it to a 300lt water tank heater which I picked up from a scrap metal merchant This gave me extra vacuum reserve if neccessary, it took about 20-25 minutes to get down to almost pure vacuum and then I just switched the pump off and closed the valves in the line. I have no idea how much vacuum you need for a chuck but I would imagine that a water heater would hold way more than you would require. At least this way the pump would not be running continously and if the vacuum was starting to run out due to leakage, you could always switch the pump on again.
Cheers
Ed.
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7th September 2013, 01:37 AM #24New Member
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Hey Scott,
Lots of vacuum pumps are available on ebay. Alternatively, you can have a look onto engineering supply companies. As I know they might have it on lower price. We have it on Tizaro also. You can check if you get any that meets your need.
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8th September 2013, 04:18 PM #25Hewer of wood
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FWIW I've had hours of use out of an ordinary domestic vac, just with a couple of 3mm bleed holes drilled in the line close to the headstock.
My scientific measure of load is the rise in pitchCheers, Ern
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9th September 2013, 08:13 PM #26
vacumm chuck
hi scott,
sorry, i have been a bit busy,but did manage to get a bit of turning/photographing
on the weekend,hope these photos help to explain what setup i have
if you need any more help just let me know
sorry the pics are not great
cheers smiife
08092013(008).jpg08092013(007).jpg08092013(005).jpg08092013(001).jpg08092013(003).jpg08092013(004).jpg08092013(002).jpg08092013.jpg
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9th September 2013, 10:31 PM #27GOLD MEMBER
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9th September 2013, 10:36 PM #28GOLD MEMBER
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10th September 2013, 08:20 PM #29
hi scott,
i got it from craft supplies usa,there web address is Pen Making, Bowl Turning, Wood Lathes, Wood Blanks, and Turning Tools for Woodturners | Craft Supplies USA
look it up just go to the chucks section and vacuum chucks
hope this helps
i tried to find similar in aussie but could not find anything ,i always
try to source tools etc at home first,but could not....
cheers smiife
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