Osg form tap speeds and feeds9/8/2023 Chipping of spiral point taps is generally caused by RPM that isħ. Tapping, too slow can cause as many problems as running too fast.Ħ. Be aware of the correct RPM range for the material you are Surface treatments reduce friction and help prevent galling andĥ. Make sure you are using the correct GH Limit.Ĥ. Make sure the hole is clean,ĭo not over peck especially in stainless and nickel based materials.įor best results use OSG cobalt and carbide drills for the best holeģ. Use the correct style of tap for the job.Ģ. * To calculate metric threads divide the pitch by 25.4 and multiply by RPM to give you IPM.Įxample: M8 x 1.25 500 RPM 1.25/25.4=0.049x500=24.60ġ. Stainless Steels 300, 400 Series S/O, TiN, TICN Tool Steels A2, D2, S7, H13 etc up to 35 HrC S/O, TICN Low 1010 - High Carbon 1080, A36 Hot Roll. Use the right OSG tap and coating for the material and application. There are usually two processes, pvd a lower cost coating and cvd which provides better grain structure, harder surfaces and up to four times longer tool life. The hardest of all coatings, (8,000 vickers) used in non ferrous applications, aluminum, copper, graphite, etc. Dry machining in the high speed applications is possible.ĥ. It also has the highest oxidation temperature (800 c) primarily used on carbide drills and end mills. One of the hardest (2,800 vickers) with good lubricity (0.3 coef. Can also be used for aluminum and cast iron with good results.Ĥ. Harder than TiN (2,700 vickers) better for hard steels. A hard (2000 vickers) durable surface coating (5 microns) that offers high lubricity (coef, of friction 0.4) increases tool life and also utilizes higher speeds and feeds than uncoated tools.ģ. A porous surface that retains cutting fluids to help add lubricity, reducing heat and friction.Ģ. 220, right in the middle of the tolerance. 0005Įxample: for 1/4-20 tap using a GH5 limit the actual tap P.D. Slow spiral for hard materials Draws chips out Spiral flute for aluminum Flute design draws chips outĦ. Spiral flute (new style) necked or din style Draws chips outĥ. Spiral flute (old style) Draws chips outĤ. Hand style straight flute Chips stay in fluteģ. Written by Mike Whitney and OSG Tap & Dieġ. Some machines can easily handle high tapping speeds others cannot,Įspecially when ridged tapping.You have more of a chance at high speed with float tapping,Īs this compensates any alignment problems. Put the full thread feed back to 100% on the way out, so the tap never catches up with the holder.Ĭompression type holders are a pain especially on the bigger taps in blind holes.Īs the taps wear and distance to depth will vary.You will end up deepening the tapped hole and when a new tap is installed it will bottom out as it will travel further.My advice is get rid of this type of holder for production runs in blind holes. When float tapping only use pullout type holders not compression, at a feedrate ofĩ5%on the way in (ipm 5.2), allowing the tap to "float" when reversing this stops snatching. Ģ80rpm = ipm 5.5118 when RIDGED tapping 0.5mm, this stops tap wear. No Matter what speed you end up using ,convert to the exact feed. Just goes to show that no mater how much you dumb up a manual, its never enough. Seems like a simple note in the manual something like "the spindle won't run until its below the rapid plane" would be in order. Not sure why but decided to give it another shot, knees knocking, two hand on the E-stop and braced for impact, 1" above the part it start turning and feeds in, stops and backs out. the spindle isn't turning and its getting really close to the hole E-stop, scratch my head, check the program and it looks good - reread the manual and scratch some more. Machined the fixture and drilled the holes and here comes the tap. To my surprise the manual was pretty straight forward and it was easy to program. Was building a fixture and decided to give that "rigid tap option" a spin. Having never even been close to VMC before I managed to get it up and going and making chips pretty quickly. Speaking of rigid tapping.the first of this year I purchase my first ever CNC mill a Hurco VM-10.
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