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11/12/2019, 12:13 PM | #1 |
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Join Date: Nov 2002
Location: Putnal Valley, NY
Posts: 2,191
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Drilling and Tapping a PVC Blind Flange
I would like to drill and tap a PVC blind flange for a project. I have no trouble using the taps to get NPT threads. The problem is, the drill bits I've used don't produce a smooth enough hole (I get chipping, vibration, etc. when using a drill press)
Moreover, the holes typically use very odd sizes (to the 64ths), making finding a n answer difficult. Has anyone ever tried to drill and tap holes in plastic on the 3/4", 1" size? Matt
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11/12/2019, 12:37 PM | #2 |
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Join Date: Sep 2003
Location: North Carolina
Posts: 20,050
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What type of bits are you using?
A regular twist drill really isn't the best for plastic like that and certainly not in that size.. Spur/Dowel bits can work better in plastic... Other tricks like smaller pilot holes/countersinking,etc... in addition to firm/solid work holding can be used. Bi-metal hole saws can be used too but use caution to avoid overheating/melting the piece.. Shallow "pecking" and even water cooling can help there.. Beyond that a CNC router/zero or single flute bit does a great job too boring the hole.. You can likely get by though with a drill press and a regular twist drill but you must clamp the work piece, lock down the table and go very slow.. (try the pilot hole/countersink too)
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