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  1. #1
    Join Date
    Feb 2011
    Location
    Mornington Peninsula
    Posts
    183

    Default Machining Advise: Small Production Run in PVC 21mm +/- 0.05mm Bore

    What would be the best way to machine out a PVC pressure pipe fitting from ~19.7mm (haven't accurately measured yet just a ball park) to 21mm +/- 0.05

    The depth of the hole will be 22.4mm

    Its really just enlarging an existing hole in a standard PVC pressure pipe fitting.

    Fitting can be easily held in a 3 jaw chuck.

    If the bore hole is off centre to the PVC fitting that is not a problem and will not effect the end product. Means I can just slap it into the 3 jaw chuck and let it more or less self centre.

    Rather than a boring bar I was thinking of a reamer held by the tail stock or even an slot drill held via an adaptor in the tail stock.

    Cheers

    Justin

  2. #2
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    Hi Justin, you might/maybe have a problem with the plastic binding on the side of a ream or slot drill, depends on the type of placka, also will the jaw's of the chuck squish the fitting out of round ? If so I would make a mandrel of some type to hold the fittings and bore them, or insert a suitable sized peice of stock into the chuck end if you are not going to bore them all the way through.

    Have you got a pic of the fitting ?

    john

  3. #3
    Join Date
    Sep 2008
    Location
    Queensland
    Posts
    445

    Default

    Sounds like your fussing a bit, just run the boring bar in with one cut once you have it on size lock the slides and dont retract the tool. your depth isn't that deep put a pen mark on the ways and run the carriage up to it I do it all the time for boring PVC pipe fittings at work. I just made some cal cylinders at work with gray and clear PVC, being able to see the glue spread is interesting, you could clearly see how the champher on both parts spread the glue evenly.... and air bubbles


    What size pipe are you using? we only use Sch80 at work
    happy turning

    Patrick

  4. #4
    Join Date
    Feb 2011
    Location
    Mornington Peninsula
    Posts
    183

    Default

    Can't find a handy pic with Google but it's a iplex 20mm x 3/4 male inline adaptor.

    I can hold the glued end into the chuck no problem so the machined end won't get distorted.

    Only PN12 pipe.

    Yes I could be over complicating things

    Although I only have a carbide boring bar so I might need to get a HSS one for a better surface finish. (Hence looking/justifying another method. Work would pay for the extra tooling too)

    Cheers

    Justin

  5. #5
    Join Date
    Feb 2011
    Location
    Mornington Peninsula
    Posts
    183

    Default

    It's for part "13".

    http://www.cwc.com.au/downloads/Spar...DP+%20v1.1.pdf

    Part 13 is two fittings that screw together and hold the check valve.

    Cheers

    Justin

  6. #6
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    If someone else is paying for the tooling bore it .3 under size and then ream.

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