terribleturner Posted May 19, 2007 Share Posted May 19, 2007 Ok, im installing my EGT and have drilled the hole in the Hot Side of the turbo but i just can't tap it the bit just goes round and doesn't bite Any ideas?? At this point im just gonna hammer the f'ing bose into it Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 You've drilled a hole too small or you have a non tapered tap? You should have 2 taps, one a tapered starter tap and one a non tapered full tap. What size tap (thread size) is it? Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 Ok, i have no idea what you said there It's a 1/8npt i belive. The hole isn't too big YET. Im using just the one piece that i assume is called the tap. It's a drill bit like thing. Im winding it in to cut the thread but it's just not taking and going rouns and round. I'm scared to drill it anymore incase i go past the point of no return Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 A 1/8 NPT tap should have an 8.5mm hole drilled first. Does this look about the right size for the tap you have (i.e. the tap isn't bigger than 8.5mm diameter?). Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 Yeah that's right. Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 And its still not taking? Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 No, just goes round and round and doesn't bite. Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 Get a 10mm drill and just chamfer the top of the hole so it has a 45 degree edge, just to about 1mm down. This will help start the tap biting. Then push down hard on the bugger as you turn it! Edit - Make sure you don't power the 10mm drill all the way through. Turn it by hand to prevent a mishap! Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly and my spanner, i managd to get it in and stay. Thanks for the help. Think i need to learn more about this tap and die business before i use it again Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 Oh, and whan tapping you're supposed to go in half a turn then go a full turn back to clear the swarf from the thread cutting face otherwise it jams up... and lubricate it too Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 Definatly wasn't aware of that Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly and my spanner, i managd to get it in and stay. Thanks for the help. Think i need to learn more about this tap and die business before i use it again So have you cut a full thread or just jammed the boss in? Quote Link to comment Share on other sites More sharing options...
merckx Posted May 19, 2007 Share Posted May 19, 2007 Have you tapped any holes before? If not it would be wise to have a practice on a scrap piece of metal. Too late. Quote Link to comment Share on other sites More sharing options...
Jake Posted May 19, 2007 Share Posted May 19, 2007 As said above, you need to go back and forth only cutting a ¼ to ½ half turn each time. Take it slowly and you'll get there fine in the end. Quote Link to comment Share on other sites More sharing options...
Guest gzaerojon Posted May 19, 2007 Share Posted May 19, 2007 and get yourself a Zeus book so you know all the correct drill sizes to the holes you tap Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 So have you cut a full thread or just jammed the boss in? Eeerrr, not totally jammed it did cut a thread slightly and after making sure it was actually go in with thee help of my screwdriver i just had to wind it in more. Have you tapped any holes before? If not it would be wise to have a practice on a scrap piece of metal. Too late. Well my first ever try was on my vaccum source off the turbo. Worked fine Next time will be in a couple of weeks for my new catch can. What do you use to lubricate it?? Quote Link to comment Share on other sites More sharing options...
Guest gzaerojon Posted May 19, 2007 Share Posted May 19, 2007 What do you use to lubricate it?? i normally use normal 3 in one oil, but you can buy a cutting fluid from most engineering places. i'll find a link Edit: this sort of thing Quote Link to comment Share on other sites More sharing options...
G-NEMIE Posted May 19, 2007 Share Posted May 19, 2007 Ok, after just trying again it started to take ever so slightly and then stopped. So got the insert bose and with a screwdriver pushing against it with my belly and my spanner, i managd to get it in and stay. Thanks for the help. Think i need to learn more about this tap and die business before i use it again thank god for the belly Quote Link to comment Share on other sites More sharing options...
terribleturner Posted May 19, 2007 Author Share Posted May 19, 2007 i normally use normal 3 in one oil, but you can buy a cutting fluid from most engineering places. i'll find a link Edit: this sort of thing Nice one thanks Jon thank god for the belly I always knew it was to serve a higher purpose Quote Link to comment Share on other sites More sharing options...
Kranz Posted May 19, 2007 Share Posted May 19, 2007 What do you use to lubricate it?? Mostly any oil will be better than nothing Quote Link to comment Share on other sites More sharing options...
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