pkrankow Posted February 1, 2010 Share Posted February 1, 2010 I'd buy some new contact tips instead of ordering a special tap. Likely cost less. I am using some Lincoln Electric tips from Lowes, they have 1/4-28 threads. Phil Quote Link to comment Share on other sites More sharing options...
reefera4m Posted February 4, 2010 Share Posted February 4, 2010 I visited the best hardware store that I know of, about 15 minutes from my house. They have a large fastener selection. We were unable to find a compatible nut. The pitch is 24 threads per inch; that is what I measured, and they confirmed it. We tried metric sizes, as well as #12-24. Nothing fit. I measured the OD of the threads with a digital caliper, and came up with 0.230 inches, a little less than 1/4 inch. The manager of the fastener department said that it had to be a special thread, and I am inclined to agree with him. He said that anything 1/4-24 was probably pre world war II, but that the railroads still used it because they have some lights that were made that way. I may order a special tap, size 1/4-24, knowing that it will be a little large. It may not work too well, but maybe better than the 1/4-20 that I tapped the hole for the first time. (For quarter inch, the standard threads are UNF 1/4-28, and UNC 1/4-20.) Richard That's exactly the approach and outcome I got - it looked line 1/4" 24 thread. It turned out tips were indeed metric. 6mm to be exact which requires #5 drill bit. Quote Link to comment Share on other sites More sharing options...
dragonflySmithy Posted February 14, 2010 Share Posted February 14, 2010 I'd buy some new contact tips instead of ordering a special tap. Likely cost less. I am using some Lincoln Electric tips from Lowes, they have 1/4-28 threads. Phil I agree on the new tips and the other thing to do is to hit them with some solder to make sure it's sealed. Quote Link to comment Share on other sites More sharing options...
territorialmillworks Posted February 15, 2010 Share Posted February 15, 2010 Lincoln tips are 1/4-28. I've run Tweco tapered tips side by side with straight tips and couldn't tell any difference. If you want, chuck a straight tip in a drill and run it against a flap sander = a Tweco tapered tips. Quote Link to comment Share on other sites More sharing options...
Focalforge Posted February 26, 2010 Share Posted February 26, 2010 2 questions, What size bell reducer are you using? It should be a 2-3/4 with the tips. and did you solder/braze the joint between the pipe and tip? Jamison Quote Link to comment Share on other sites More sharing options...
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