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IndustryArena Forum > WoodWorking Machines > DIY CNC Router Table Machines > Water cooled 2.2 KW Spindle water fitting
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  1. #1
    Join Date
    Jan 2005
    Posts
    398

    Water cooled 2.2 KW Spindle water fitting

    Has anyone figured out what the thread on the fittings are. I am looking at changing them out as I am having problems getting tubing to fit. 3/16"x14" does not clamp down properly and is very flow restrictive. 1/4x 3/8 wont fit in the ferrule nut.

    I though they would be 1/16th NPT. The place I went today didn't have much in 1/16" but the one sample we looked at did not match.

    A search on the web did not lead me to find anything.
    diameter at 3rd thread seems to be ~ 7.8mm and pitch could be 1.0mm

    Thanks
    Dave

  2. #2
    Join Date
    Jan 2007
    Posts
    723
    I too would like to replace the fittings on my spindle. They have a very small opening and I cant use a fountain pump to push the water over 30 ft with a 5.5ft rise through 1/4" line because of the connectors. I used to have a reservoir mounted on my gantry but I moved it now I don't get enough flow.
    http://www.glenspeymillworks.com Techno LC4896 - 2.2Kw Water Cooled Spindle | Moving Table Mill from Omis 3 CMM, 500Lb granite base | Epilog Legend 32 Laser Engraver

  3. #3
    Join Date
    Jan 2005
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    398
    Have you tried a Little Giant 3E-12N Series pump? My research indicates that will work. Had a nice chat with Little Giant tech support today. They seem to be in the $150 price range. I might pick one up. What tubing did you gt to fit on the fitting?
    Sizing was based on 40ft of 3/16th I think with 5 foot rise.
    Dave

  4. #4
    Join Date
    Jan 2007
    Posts
    723
    Thanks for the advice but I will NOT buy another pump for this spindle setup. In school I built a 4'x4' router and used the same spindle I have at home. -A 2.2kw from LMB2008. This spindle had a larger opening and the 1/4" tubing worked great with a smaller pump. I have a more powerful pump at home and I barely get a few dribbles. Besides a couple of $5 connectors makes more sense than a $150 pump!
    http://www.glenspeymillworks.com Techno LC4896 - 2.2Kw Water Cooled Spindle | Moving Table Mill from Omis 3 CMM, 500Lb granite base | Epilog Legend 32 Laser Engraver

  5. #5
    Join Date
    Jan 2005
    Posts
    398
    Yes I agree I don't really want to have to buy a more expensive pump either. Just looking at options.
    I take it you are running 3/16" x 1/4" tubing?? I was real unhappy to find you can't seem to get 1/4"x5/16" tubing. That would help a lot.
    I may get some special fitting made. What is your threshold of pain for them?
    I don't have a CNC lathe (yet) but I have a buddy that might be able to squeeze them in. My kid is working so she cant make them for me at school. I guess I could fit the tape attachment on my lathe but that's a pain.
    Dave

  6. #6
    Join Date
    Jan 2007
    Posts
    723
    Did you look on mcmaster.com for tubing? They have just about every size under the sun.

    Those connectors must be some type of common thread. I can't imagine some Chinese factory spending money on custom tooling and parts. It's probably just not common in the US.

    I might contact se of the eBay sellers and see if they can supply us with the part. It will have to wait until the school year is done in a couple of weeks though. I'm just too busy now.
    http://www.glenspeymillworks.com Techno LC4896 - 2.2Kw Water Cooled Spindle | Moving Table Mill from Omis 3 CMM, 500Lb granite base | Epilog Legend 32 Laser Engraver

  7. #7
    Join Date
    Mar 2003
    Posts
    35538
    My bet would be metric threads and tubing.
    Gerry

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  8. #8
    Join Date
    Jan 2005
    Posts
    398
    Ger,
    I agree its most likely a Metric thread. I have spent some time measuring it and it to my mind is a Tapered thread. 1.0mm pitch but diameter does not seem to be the 8mm it should be. I might be mis-measuring the diameter. Also if its a 8mm x1.0 like I think its seems to be only a thread used on grease fitting. I might see the vendor face to face next week and hopefully will make some progress. He has not replied to my email. I hope he is waiting for a reply form his factory. ;-)
    But without a fitting to check its a problem. Searching on the internet has not brought much joy in finding a source. I will have to poll a few of my friends in total metric country.

    Mcmaster Carr is not an option in Canuckastan.
    Thanks
    Dave

  9. #9
    Join Date
    Jan 2005
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    398
    A few minutes with the lathe and a 3/8" endmill have the 1/4x3/8 tubing properly secured. :-)
    Dave

  10. #10
    Join Date
    Jan 2005
    Posts
    398
    Glenn,
    Remember that $150.00 pump I was telling you about.
    I found a surplus place it NJ that is selling them for $40.00. They claim new but taken out of equipment I think. I ordered a couple.
    Drop me a PM for details.

    Dave

  11. #11
    Join Date
    Jul 2009
    Posts
    9
    My spindle ordered off ebay for $350 with the Haunyang Variable Control Display VCD has 5/16 24 water jacket threads. Its the one with the chrome on top that cant be pried off

    The seller is qiandingzhensatisfaction heres the link It will prolly expire soon 2 2KW Water Cooled Spindle Motor 2 2KW Inverter Drive VFD Grinding Engraving C | eBay

    Weird 5/16 for a Chinese spindle. Harbor Freight has an air inflator kit which has a 5/16 brass inflator tube bout 4 inches long that has some metric thread M8 er summin, I couldn't find a die that would fit it correctly. What I plan to do is cut the threads off re thread it to 5/16-24. The brass tube fits Home Depot 5/16 clear plastic tubing perfectly. BTW the clear plastic tubing comes in 12 foot roll for $5.68

    I have a Pick and Pull bout 5 miles away and Im gonna get a Automatic Transmission cooler for $8 and pipe it up. I have a old 12VDC computer Fan to blow air though it along with a eBay Pond pump for $12.

    The pump is a submersible pump I bought years ago What I plan to do is crack the cage off of it and tap some treads into the input hole. Thread a 5/16 brass nipple.

    Just thoughts fer now I'll let you know if it works and post some pictures.

  12. #12
    Join Date
    Jun 2012
    Posts
    182
    Other people have just used a short 3/16" section at the motor, then 1/4" to the pump.

  13. #13
    Join Date
    Jul 2009
    Posts
    9
    Quote Originally Posted by elfrench View Post
    Other people have just used a short 3/16" section at the motor, then 1/4" to the pump.
    Thanks. Yes The 5/16 is OD of the brass tube. Threaded would be 3/16. I searched but maybe not quite good enough. 1/4 to the pump OK will note that.

    Thanks again.

  14. #14
    Join Date
    Jun 2012
    Posts
    182
    I'm planning on using these from McMaster-Carr: 5554K12 and 5116K53

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