![]() ![]() So if we’re going 1000 rpm and cutting a 20 TPI thread, we need to advance 1000/20 = 50 IPM. It’s our spindle rpm divided by our threads per inch (TPI). Given the spindle rpm’s the Tapping Feed Rate is just how fast we have to feed to move one full thread per spindle revolution. Tapping Feed Rate & Tapping Feed Rate Formula Given SFM from the table, plus the tap’s diameter, we can calculate rpm with this formula:īTW, that’s from our article on RPM from Surface Speed if you want the details. We can find the recommended surface speed to tap many workpiece materials in this table: For a more sophisticated calculator that will figure that out for you as well as help you find the right TPI value and work in Metric, keep reading! Recommended Surface Speeds (SFM) by Material ![]() The spindle speed depends upon the material you’re trying to tap and the diameter of the tap. Everything starts from Tapping Speeds What Tapping RPM or Tapping Speed Should I Use? Bronze: Kerosene or mineral spirits mixed with a small amount (10–15%) of petroleum-based cutting oil.Tapping Feeds and Speeds are pretty easy to calculate because they’re constrained by the thread that is being tapped. Aluminum: Kerosene or mineral spirits mixed with a small amount ( 15–25% ) of petroleum-based cutting oil. An air blast should be used to clear chips. This mixture is also suitable for use with stainless steel. Alloy Steel: Petroleum-based cutting oil mixed with a small amount ( approx. Recommended lubricants for some common materials are as follows: Carbon (mild) Steel: Petroleum-based or synthetic cutting oil. The use of a suitable lubricant is essential with most tapping and reaming operations. This fliud will extend tool life and yield a super machined finish.Clings to vertical surfaces for continual lubrication.Cutting Tool Lubricant Type 11-AG Ultra S/P™ Super Premium - High Viscosity Heat - treat M2 as the base drills before coating would measure 880 HV (65RC). * Coating hardness is measured in HV (hardness in Vickers). However, the end user still needs to be cautious to not exceed the limitations of the high-speed steel.For semi-dry to dry cutting of most steels, high-nickel alloys, stainless steel and cast iron.ALTiN/TiAIN coating is great choice in machining stainless steels (All) at any speed.Titanium Aluminum Nitride (TiAIN) - (4500 HV)* Layer of TiCN to a cutting tool will increase life span up to 6X.Designed for hardened steels and cast iron up to 45 Rockwell C.Suitable in very abrasive and high tensile materials.Recommended for aluminum, brass and bronze applications.Titanium Carbon Nitride (TiCN) - Pink to Purple (4000 HV)* Can push it 10–25% faster, but may compromise tool life.Results in drilling through steel ranges 2X to 6X life span.General purpose coating, low heat resistance and good lubricity.Informative Tapping Checklist Benefits of Coating Tools Titanium Nitride (TiN) - Gold (2900 HV)* Recommended Feeds and Speeds table below suggests a "starting point" for selecting the speed to operate the tap. Vertical tapping speeds can be increased, compared to horizontal tapping. Holes, taps with tapered chamfers are able to operate faster than taps with bottoming chamfers. Speeds must be reduced as length of hole increases. The optimum speed for tapping is highest speed that conditions permit, consistent with acceptable tool life. Proper tapping speeds are very important in obtaining efficient tapping results. Cutting taper threads (50% Normal Speed).Bottom lead or Spiral flute taps are used.Lubricant is Poor, or Flow is Restricted.RPM = Feed Speed (SFM) / 0.26 x Tap's Outer Dimension Tapping speeds should be " DECREASED" if Tapping Speed can be calculated using: (Use Table below) Check hardness of material, especially when changing batches of material.Keeping taps sharp, check tap for wear.Use the correct Tapping Drill Size and Type of Tap.Choose the correct lubricant (Ultra S/P™ Super Premium).Use a pitch controlled tapping attachment.To minimize tapping issues the following rules should be followed: America´s Finest High–Speed Cutting Tools™ How to Tap Effectively and Optimize Tool Life ![]()
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