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  1. #1
    Join Date
    Mar 2008
    Location
    Nth Qld
    Posts
    1,874

    Default PVC reducer 2" to 1.25"

    Has anyone had any success with various PVC drainage/pressure pipe or electrical conduit lengths and fittings that would enable a standard vacuum cleaner hose with 1.25" I.D ( 32mm) to connect to a 2" ( 51mm) O.D outlet ?

    All suggestions and ideas gratefully received
    regards,

    Jill

  2. #2
    Join Date
    Feb 2009
    Location
    moonbi nsw Aus
    Age
    65
    Posts
    1,863

    Default

    Jill,
    Do you have a wood lathe? Or have access to one? You could easily make up a reducing bush with inner and outer diameters to suit your requirements.
    Turn up a piece of timber to suit. If it breaks, male up another one. You could hold it in place with a short wood screw.
    Just a thought
    Just do it!

    Kind regards Rod

  3. #3
    Join Date
    Nov 2006
    Location
    Rockhampton
    Age
    58
    Posts
    2,235

    Default

    Hi Jill,
    If there are no standard fitting/s available (odd size to odd size) I have either expanded or shrunk pvc pipe just using a hot air gun for the heat and a former of some sort to push the pipe either into or onto depending on whether I am shrinking or expanding, I have also used a hose clamp to shrink, for a round shape tho you will need to rotate the clamp as the pipe cools, there will come a limit to how much you can shrink/expand a given size so maybe a combo of standard fittings and pipe sizes,...and the right amount of heat is important as well too much and it's too floppy and can end up a crinkled mess, not enough and it won't go over/into and a gradient of heat in the pipe is good, hotter at the very end and less so up the pipe.


    Pete

  4. #4
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    23,403

    Default

    To shrink PVC I usually heat the middle of a length of pipe and then stretch it and it forms a fairly smooth graduated transition. The hardest thing is to heat it evenly so I usually put it on the WW lathe.

    To expand one end of a short section of PVC pipe I made up a set of WW chuck jaws similar to the nova soft jaw, but with two steps - one for 6" and one for 4" pipe. I place the pipe in the jaws, start turning the pipe and apply heat with the heat gun, Every 20 seconds or so I stop the lathe and expand the jaws. When I reckon I'm good I remove the heat and let it spin till it cools. This works really well.

  5. #5
    Join Date
    Dec 2008
    Location
    Eastern Australia
    Posts
    604

    Default

    Quite easy. Get a length of the larger size pipe and some pvc pipe glue. And you should have acetone or equiv. Cut a piece off your pipe and cut a slot lengthwise out of that.. File your cut wider till when the pipe is compressed , your small cut off piece fits inside the larger pipe. Clean the outside of the small piece with acetone and the inside of the large pipe. Paint the inside of the large pipe with the blue pvc glue and shove the small bit with the cut into it. Continue till size required found.

  6. #6
    Join Date
    Feb 2009
    Location
    Bristol, UK
    Age
    61
    Posts
    1,540

    Default

    I'm with chambezio, I turned mine to fit on the lathe.
    Dragonfly
    No-one suspects the dragonfly!

  7. #7
    Join Date
    Oct 2003
    Location
    Sydney,Australia
    Posts
    3,152

    Default

    If you know anyone casting their own pen blanks, you should be able to get them to cast you chunk of plastic about the right size, just a bit under size where it fits ovr and a bit over size where it fits inside. As a single shot casting you could make the master from MDF & putty, then use any available mold material (alginate, shower rtv etc) then cast it in resin & turn/scrape/sand the finished product to final size.

    Or you could look at Rockler & Lee Valley for their vacuum to dust pipe adaptors, particularly Rockler who have an amazing variety of bits, including rubber sleeves that can compress with pipe clamps.

  8. #8
    Join Date
    Jul 2008
    Location
    Rockhampton
    Age
    71
    Posts
    50

    Default

    Hi Jill,

    I've had the same problems & usually i check out the local Electrical, Plumbing, Irrigation wholesalers, but often have to resort to turning down the plastic fittings / pipe in a lathe.

    There are some excellent suggestions made by the other contributors.


    Regards,

    Alan

  9. #9
    Join Date
    Mar 2008
    Location
    Nth Qld
    Posts
    1,874

    Default Success

    I have found success , but with a bit of variation. I found a pipe that fits in a 50mm nominal dust cyclone outlet, not over the outside of the outlet as originally intended.

    The key piece is a 40mm PVC slab repair coupling, available from Bunnies or any plumbing shop for about $2.50. One end is 48.7mm OD, 43.0 mm ID, The other end is 38.7- 39.7mm tapered OD and 33.5mm ID. A standard 1.5 inch ID (38mm) vacuum hose could fit nicely over the smaller end with a bit of filing or turning down.

    A 40mm DWV ( drainage waste vent) pipe fits snugly in the larger end. This pipe also fits snugly into the 50mm vacuum inlet on a Oneida Dust Deputy from Carbatec.

    The narrow end of the coupling takes a small 20mm Class 18 ( high pressure) joiner (33.5mm OD, 26.6 mm ID) from Bunnies for $0.80, which can be filed or turned down to 31.8mm to take a standard 1.25 inch ID vacuum cleaner hose.

    So this setup allows me to connect a standard 1.25" vacuum cleaner hose to a 50mm outlet on a Dust Deputy for less than $4 plus the cost of some DWV PVC pipe off a plumber

    thanks for all the suggestions and ideas
    regards,

    Jill

  10. #10
    Join Date
    Aug 2005
    Location
    Queensland
    Posts
    2,890

    Default

    Great find Jill ~ have a greenie for your efforts

  11. #11
    Join Date
    Mar 2008
    Location
    Nth Qld
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    Default

    Crikey, Bob, up here the Katter Party mavericks shoot greenies Why do you think Bob Brown stepped down? He was in fear of his life now that the KAP's were infiltrating the parliamentary scene !!
    regards,

    Jill

  12. #12
    Join Date
    Nov 2006
    Location
    Rockhampton
    Age
    58
    Posts
    2,235

    Default

    Good on the success, it was good to see the variety of possible solutions in the replies




    Pete

  13. #13
    Join Date
    Jun 2003
    Location
    N.W. Melb Suburb
    Age
    80
    Posts
    2,294

    Default

    A couple of rounds of duct tape will usually take up any slack between these PVC fittings when they are pushed together
    Tom

    "It's good enough" is low aim

  14. #14
    Join Date
    Mar 2008
    Location
    Nth Qld
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    1,874

    Default

    I prefer to get a snug fit between the fittings and cement the joint, rather than using duct tape or masking tape. Taping is my last resort
    regards,

    Jill

  15. #15
    Join Date
    Aug 2005
    Location
    Queensland
    Posts
    2,890

    Default

    Quote Originally Posted by JillB View Post
    Crikey, Bob, up here the Katter Party mavericks shoot greenies Why do you think Bob Brown stepped down? He was in fear of his life now that the KAP's were infiltrating the parliamentary scene !!


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