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  1. #31
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    crowie is online now Life's Good, Enjoy each new day & try to encourage
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    Quote Originally Posted by Hermit View Post
    The only fault, if you can call it that, is that the little pump gets hot pretty quickly. Much more than 30 min in one go and it's almost too hot to touch. I give it 15 minute bursts, then pull up the tail-stock with a padded disc and give the pump a break for a bit. Cuppa time.

    I have a small 6" desktop fan on it now, which helps a lot, but in the longer run I'll either buy a bigger fan or a bigger pump. Probably the former.

    I still haven't made any vacuum cups to go with it, either. Only the flat disc so far. I'll make them as I need them.
    G'Day Steve,
    Can I suggest that you check the "vacuum pump" manufacturers website for some technical spec's on running temperature & duty cycle ratings... They may have some "trouble shooting" charts that offer assistance...
    Cheers, crowie

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  3. #32
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    Quote Originally Posted by crowie View Post
    G'Day Steve,
    Can I suggest that you check the "vacuum pump" manufacturers website for some technical spec's on running temperature & duty cycle ratings... They may have some "trouble shooting" charts that offer assistance...
    Cheers, crowie
    Hi Pete. This is only a cheap, no-name, Chinese pump, so unfortunately no website to check out.

    Still, the reason it runs hot is that these pumps are only intended to run for short periods, while evacuating an air-conditioning unit. It's quite normal, from what I've seen and read, for them to get hot when used continuously. A decent fan will cure that.

    The pump itself is oil-filled and doesn't get hot too quickly, either, just the motor.

    Generally, only one or two 15 minute sessions are needed to finish the bottom of most things, too, so it's not much of a worry. Just a bit of turning on the foot, then sanding.
    ... Steve

    -- Monkey see, monkey do --

  4. #33
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    Default hose question

    I was wondering how effective the silicon vacuum hose was, given that it doesn't look like it is reinforced.

    I just bought the fittings to put my system together but they didn't have any hose and I have been having trouble finding it on the web, other than in the US, where they want two arms and a leg for postage.

  5. #34
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    Quote Originally Posted by starr View Post
    I was wondering how effective the silicon vacuum hose was, given that it doesn't look like it is reinforced.

    I just bought the fittings to put my system together but they didn't have any hose and I have been having trouble finding it on the web, other than in the US, where they want two arms and a leg for postage.
    It works well. I don't do any turning any more, but during the time I used it I never had any problems with the tube collapsing. One of it's intended purposes is vacuum connections. It's a very solid hose.

    You clearly didn't look in the right places. Did you try eBay? I typed in "6mm silicon hose" and got immediate results.
    ($5.65 per metre with free delivery.)
    Silicone Hose Silicon Vacuum Tube Tubing for Water Air Coolant Blue Black Lime
    ... Steve

    -- Monkey see, monkey do --

  6. #35
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    I tried a home made set up using a shop vac. Didnt seem too successful on small items

    DaveTTC

    Turning Wood into Art

  7. #36
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    Quote Originally Posted by DaveTTC View Post
    I tried a home made set up using a shop vac. Didnt seem too successful on small items

    DaveTTC

    Turning Wood into Art
    No, a shop vac can't pull a high enough vacuum. Even using a vacuum pump like mine, small items are a bit touch and go, and require a light touch. Small items don't have enough surface area for a tight grip.
    ... Steve

    -- Monkey see, monkey do --

  8. #37
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    Can't add anything to the discussion, but really great to see Hermit back on the forum.
    Welcome back, I look forward to more of your posts.

    Alan...

  9. #38
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    Interesting thread, thanks for posting.

    A few years ago I picked up two 40+ year old 14 cfm Leybold laboratory two stage vacuum pumps from a skip at work. These are serious lab pumps designed to run 24/7 for decades and while they are designed to run hot (up to 95ºC is normal) I have not seen it get that hot even running it overnight.

    These pumps had been used on and off electron microscopes for around 20 years and then put into storage until a big clean up deemed them surplus to requirements.
    They needed an oil change and it cost me $75 to get special vacuum oil from the US for them but I managed to service them both and I still have enough oil for a second service and the seemed to run great after that. These pumps are supposed to pull a vacuum of less than one millionth of an atmosphere but of course that depends on how good the sealing is and to get that requires Viton O-ring gaskets. Anyway the RRP of these when they were new in Was over $1000 and I sold one on gumtree for $500 and kept one but have had nothing serious to do with it until now .

    It will have to go on my back burner but it sounds like a good use for it. I have a MW lathe so should be able to make some the vacuum bits out of aluminium or steel.

  10. #39
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    Quote Originally Posted by Uncle Al View Post
    Can't add anything to the discussion, but really great to see Hermit back on the forum.
    Welcome back, I look forward to more of your posts.

    Alan...
    Thanks for the welcome, but I'm sort of only back temporarily Al, since I don't do any woodworking any more. I'll probably poke my head up from time to time though, if I feel that I have anything to contribute.
    ... Steve

    -- Monkey see, monkey do --

  11. #40
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    Quote Originally Posted by BobL View Post
    Interesting thread, thanks for posting.

    A few years ago I picked up two 40+ year old 14 cfm Leybold laboratory two stage vacuum pumps from a skip at work. These are serious lab pumps designed to run 24/7 for decades and while they are designed to run hot (up to 95ºC is normal) I have not seen it get that hot even running it overnight.

    These pumps had been used on and off electron microscopes for around 20 years and then put into storage until a big clean up deemed them surplus to requirements.
    They needed an oil change and it cost me $75 to get special vacuum oil from the US for them but I managed to service them both and I still have enough oil for a second service and the seemed to run great after that. These pumps are supposed to pull a vacuum of less than one millionth of an atmosphere but of course that depends on how good the sealing is and to get that requires Viton O-ring gaskets. Anyway the RRP of these when they were new in Was over $1000 and I sold one on gumtree for $500 and kept one but have had nothing serious to do with it until now .

    It will have to go on my back burner but it sounds like a good use for it. I have a MW lathe so should be able to make some the vacuum bits out of aluminium or steel.
    As long as they can pull more than about 15inHg, they should be fine Bob. My pump needed a specialised oil too, but I bought a bottle when I first built the vac chuck system, for top-ups. Not cheap, but only very occasional top-ups are needed.
    ... Steve

    -- Monkey see, monkey do --

  12. #41
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    Default Alternate vacuum hose

    Auto fuel hose for fuel injected cars should be stiff enough. It is made for over 100 pounds per square inch pressure.

    Our big box construction supply stores have a section in plumbing with all kinds of hose. I don't know what AU has.

    There is a clear plastic hose for hooking up ice makers in refrigerators. It has a reinforcing braid embedded.

    Smaller diameter will be stiffer, you only need to flow enough to overcome leakage in the system.

    Pressure washer hose, good for 3600 psi! Airless sprayer hose. A scrap piece free or cheap from a bad one.

    Check Here: Adelaide Belt and HoseABH Home

    Automotive Hose - Supercheap Auto
    So much timber, so little time.

    Paul

  13. #42
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    Quote Originally Posted by Paul39 View Post
    Auto fuel hose for fuel injected cars should be stiff enough. It is made for over 100 pounds per square inch pressure.

    Our big box construction supply stores have a section in plumbing with all kinds of hose. I don't know what AU has.

    There is a clear plastic hose for hooking up ice makers in refrigerators. It has a reinforcing braid embedded.

    Smaller diameter will be stiffer, you only need to flow enough to overcome leakage in the system.

    Pressure washer hose, good for 3600 psi! Airless sprayer hose. A scrap piece free or cheap from a bad one.

    Check Here: Adelaide Belt and HoseABH Home

    Automotive Hose - Supercheap Auto
    That silicon tubing that I used is pretty good Paul, and strong. I can't even begin to pinch it off between fingers and thumb, and it shows no signs of collapsing even under full vacuum. Since it's for vacuum and not internal pressure, reinforcing isn't necessary.
    ... Steve

    -- Monkey see, monkey do --

  14. #43
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    Steve. Very good plans & description of methods used.
    I am watching with interest. I am off for a few weeks but will get into it when we get back.
    My lathe has a different head stock so I will need to adjust as necessary.
    Several guys at our club have similar set ups & it seems that the consensus is that the timber face plate with the rubber facing is better with a slight concave face.
    This seems to help with centering & holding the project.
    HTH
    Col
    Chucks are like potato chips....you can't have just one.

    www.bouvardbush.com
    http://www.mandurahwoodturners.com/

  15. #44
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    Quote Originally Posted by BlackbuttWA View Post
    Several guys at our club have similar set ups & it seems that the consensus is that the timber face plate with the rubber facing is better with a slight concave face.
    This seems to help with centering & holding the project.
    HTH
    Col
    That would definitely help when gripping items with a flat surface, but the flat faceplate is fine for finishing the bottom of bowls. I don't think that centring would be any easier with a concave faceplate though. The same process would still be necessary.

    Edit: Having said that, a range of vacuum chucks is best, including some with a cup shape, so one with a concave surface would complete the set. For the bowls and the lidded boxes I made, though, the flat plate was fine. I had planned to make more chuck fittings, when they were called for, but gave up woodworking before I ever had the need for more.

    N.B. This is a very old thread now, from mid 2014.
    ... Steve

    -- Monkey see, monkey do --

  16. #45
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    Quote Originally Posted by Hermit View Post

    N.B. This is a very old thread now, from mid 2014.
    But only a very few threads, like this one, is like a good wine that improves with age.

    BTW good to hear from you Steve, we've missed you on the forum.

    Peter.

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