My Father In Law has a manual mill and lathe and he just made an excel spread sheet for common sizes (1/4", 1/2", etc ). I don't have one on the back of ours because our CNC programming software takes care of that for us now : ) The better the software gets, the lazier I get. If you have time you can look for a "feeds/speeds" chart to put on the back as well for a quick RPM reference. Wouldn't Bobby Bare have loved that version?Īnyway, here's the 09:48 (#5218454 - in reply to #5218064) Subject: RE: Drill bit for 1/2" NPT Or how about that great folk song (from the mountains of N Georgia (USA Georgia! ) )."I'm 804.672 kilometers ("clicks if you were in the Army ) from home.". How about that famous Beach Boys song."She's real fine.my 6.70228 litre (liter ).My 6.70228 litre.!" Wasn't that a great song? ![]() Hopefully someday we'll get all this metric stuff behind us & it will all seem like a bad dream. I googled a bit & found this pdf showing both the Imperial decimal equivalants, but also the metric equivalent for us slackers in the USA. That will go on the back side of my drill bit vs tap size chart. Good idea on the decimal equivalants chart. Ron.NE ILL.10/48 - you for the chart! I'll be laminating a couple for the shop now too. ![]() You don't happen to have any other useful shop chart you use in the shop that I can print on the back side of this drill bit chart, do you? Posted 06:46 (#5218064 - in reply to #5217462) Subject: RE: Drill bit for 1/2" NPTĬhebanse, you for the chart! I'll be laminating a couple for the shop now too. I like the 8.5x11 size personally though : ) To answer the question 23/32 is the correct size as pointed out earlier. ![]() You can also get the 3x5 laminated card right from starrett if you ask. I have a couple I have printed off and laminated. I couldn't find a clear answer 20:04 (#5217462 - in reply to #5217273) Subject: RE: Drill bit for 1/2" NPT I googled '1/2" npt drill size' and this was the second hit. Would a 3/4" drill bit work for a 1/2" NPT tap? It is just for the hydraulic case drain on a tractor so there won't be much pressure.
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