![]() ![]() The taps always seems to be brittle where the break and the weld just breaks off a little more of the tap. ![]() I have never had much luck welding taps, though it works great for bolts and set screws. On a larger tap, I imagine that you could drill down through the middle and use an EZ out. The form tap had enough friction that this never seemed to happen. This is especially true if the tap broke on the way out (they usually do). The biggest problem I have had drilling out cut taps is that the tap keeps turning in the hole. I was able to use a cut tap to clean the remains of the form tap out of the threads. The end mill didn't quite make it to the end of the tap, but it got close enough that I could finish with a 2mm end mill that I had.ģ/32 is pretty close to the minor diameter for a 6-32, so I basically removed the entire core of the tap. 001 at a time running 500 RPM with the hole full of oil. I chucked up a 3/32 carbide end mill that was laying around. This style tap is suitable for lathes, radial drills, machining centers and tapping heads. ![]() They form the threads by exerting pressure on the material being threaded eliminating chip congestion in the flutes. The irony being that I was hand tapping the last bit to avoid breaking a tap. Form taps have lubrication grooves but no cutting faces and do not cut threads or produce chips. I managed to break a tap off tapping the last bit by hand. 125, then went at it with a Balax TIN coated threadfloer. That might be the worst combination of numbers in a machine shop. The loss of a part or a tap is often meaningless unless you are in a repair.Had a job tapping 6-32 in 304. " I just snapped a tap and destroyed a part. spray tapping fluid into all the holes, turn the coolant off and all holes tapped with oil. let the drill cycle go by, blow off the part. If I am feeling nervous, I will stand there and brush-on Union Butterfield tapping oil with an acid brush. heck, whichever one out of the pile cut taps that looked like it might be good. I prefer not to tap H900, although I have done it. If you know for sure its good material, and you have a good cut tap for it, then go for it. I had some 304 once that was the worst to tap Ive ever worked with. I commonly tap 3/4" deep and more.1/2-13 in mild steel with a common plug tap like Doorman. In 304, play it safe and thread mill would be my play. Finish pass has a speed of 1500 rpm and feed is. Some come out beautiful, more than half look like trash. my rule of thumb is just go for it, until something blows. Haas ST30y lathe, Iscar CNMG 331 F3P inserts, 6061 aluminum. for the danged things, and I killed a couple just getting the swing of it.Īnyway. Not bad at all, but that is not a cheap mill. My research says 500 rpm and 4 IPM for the drill. ![]() I would like some ideas on speeds and feeds for the drilling and suggestions for the tapping. The 'L' is for improved weld-ability they tell me. dive in with the thread-mill, at 2000 RPM ( Or whatever.) and it goes around the hole just over one revolution to finish the complete thread profile.Īnd my required effective thread, actually closer to 5/16" was done at constant speed. Posts 447 Downloads 0 Uploads 0 Tapping 304 stainless I have to drill and tap about 300 1/4 - 20 through holes. Never changed the tap.īut if you are worried about the wear and tear on the spindle, there is no way you could beat a tapping head. Make sure you choose the right tap drill for roll tapping. It will create no chips because you are forming the thread so you can take the tap as close to the bottom as you wish. I am getting more opportunity from another new customer, and most of his stuff is 304 SS. It's a stronger thread and the lead on the tap is not as long as a gun tap. 10-24 to 1/2" in 6061 at a thousand or so in, 4000 out. I don't do much in 304 s.s., but it seems to be coming around a little more often. I use Blaser 755B coolant these days, but no matter.īut. I have Rigid tapping on both my Haas and Fadal, but I generally use a floating holder on the Fadal as I have yet to tune my gain factors, and the software doesn't que up the Rigid Tap Preparation commands. I have never seriously considered peck-tapping. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |