tapping for 1/8 npt fitting
I need to tap the tuner toys tee fitting for another 1/8 npt fitting for my oil pressure guage.
1. would this weaken the tee fitting too much? 2. what drill bit do I need to use to drill the suckah? I have an npt 27 tap, will that do the tapering for me, or is there a special bit I need to use? |
Re:tapping for 1/8 npt fitting
When you bought the Tap it had the drill bit size on the package. But if you have a drill index you can take the tap and find the bit that the tap fits closest to.
Tim |
Re:tapping for 1/8 npt fitting
why dont you just add another t at the firewall somewhere. ::)
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Re:tapping for 1/8 npt fitting
Originally Posted by Hyundai4G63T
When you bought the Tap it had the drill bit size on the package. But if you have a drill index you can take the tap and find the bit that the tap fits closest to.
Tim Also, if I do use a drill index, do I need to go one step down in diameter to give the threads something to cut? I am new to the whole tap and die thing. |
Re:tapping for 1/8 npt fitting
Originally Posted by oldschoolteg
why dont you just add another t at the firewall somewhere. ::)
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Re:tapping for 1/8 npt fitting
You'll need a letter "R" drill bit or a metric bit 8.70mm.
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Re:tapping for 1/8 npt fitting
thank you very much.
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Re:tapping for 1/8 npt fitting
I wouldn't drill that fitting. Chances are it's gonna get fucked up, and getting another tee fitting would be so much easier. If you want to practice threading stuff, use a fine wood. That's how I learned. (IMO)
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Re:tapping for 1/8 npt fitting
yeah, i already bought an npt tee anyways, after looking at the tuner toys, I decided against drilling even more material out of it.
Fine wood is a good idea, I think I will do that. thanks |
Re:tapping for 1/8 npt fitting
to tap a pipe thread you need the proper size bit which i think the guy mentioned above and also a tapered reamer. pipe thread is tapered. you also need to tap to a specific depth. look for a student machinist guide or even better a book called the machinerys handbook. it will have all of this and alot more in it. its expensive at $100 though. a students guide will have the basics and will be much cheaper maybe about $30 or so. check your local book store for this.
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