![]() You can't restore the worn tap to original, but you can cut the worn end off and easily grind a new starting chamfer on the end. The way you find out is your deep hole has a tapered thread in the bottom. They wear down in the first few threads from the end. The best had a four lobed cross section with plenty of relief for the trapped cutting fluid.įorming taps get dull. Those proved to not be so good because the groove would get clogged with swarf and break the tap. The first ones we tried had a groove up the side to relieve hydraulic pressure from the tapping fluid in the hole. Not all thread forming taps are created equal. Make the tap drill hole way small so the tap forces the material to extrude out the back side, You can get lengths of thread engagement three to four times the thickness of the sheet metal. ZT Forming Tap Excellent wear resistance, heat resistance and low friction are achieved by the newly developed ZT coating Newly developed oil groove ZT flute. ![]() The straight hole method will result in a full, sharp-crested threads at the top of the hole. There's no practical way to do smallish diameter blind deep holes except with form taps.Īnother cool use is threading holes in sheet metal. The Jarflo tap will ultimately produce the proper tapered thread by forming the material from the top to the bottom of the hole. One of my long repeat jobs required a 10-32 blind hole tapped 7/8" deep. For over 30 years Harvey Tool has been providing specialty carbide end mills and cutting tools to the metalworking industry. 65 thread TAP SIZE CUTTING TAP DRILL SIZE FORMING TAP DRILL SIZE TAP SIZE CUTTING TAP DRILL SIZE FORMING TAP DRILL SIZE 0-80 3/64 No. ![]()
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