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12th June 2012, 05:18 PM #1Senior Member
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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
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12th June 2012, 05:45 PM #2SENIOR MEMBER
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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
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12th June 2012, 07:11 PM #3
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 workhappy turning
Patrick
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12th June 2012, 08:07 PM #4Senior Member
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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
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12th June 2012, 08:13 PM #5Senior Member
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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
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13th June 2012, 12:46 AM #6GOLD MEMBER
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If someone else is paying for the tooling bore it .3 under size and then ream.
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