Tap – Feeds and Speeds
America´s Finest High–Speed Cutting Tools™
How to Tap Effectively and Optimize Tool Life To minimize tapping issues the following rules should be followed:
• Use a pitch controlled tapping attachment.
• Choose the correct lubricant (Ultra S/P™ Super Premium).
• Use the correct Tapping Drill Size and Type of Tap.
• Choose the correct Speeds and Feeds.
• Keeping taps sharp, check tap for wear.
• Ensure accurate alignment.
• Check hardness of material, especially when changing batches of material.
Tapping Speed can be calculated using: (Use Table below)
RPM = Feed Speed (SFM) / 0.26 x Tap's Outer Dimension
Tapping speeds should be "DECREASED" if
• Lubricant is Poor, or Flow is Restricted.
• Bottom lead or Spiral flute taps are used.
• Thread depth ( % ) increase.
• Thread pitch is course.
• Cutting taper threads (50% Normal Speed).
• Thread Depth decreases.
• Thread Pitch is fine.
• Coolant flow and Quality is Good.
• Spiral point taps are used.
Recommended Feeds and Speeds table below suggests a "starting point" for selecting the speed to operate the tap.
|Material||Recommended Starting Point
Feeds and Speeds(SFM)
|Aluminum - Cast Alloys||60|
|Aluminum - Diecast Alloys||70|
|Aluminum - Wrought Alloys||80|
|Cast Iron - Grey||30-60|
|Cast Iron - Ductile||50|
|Cast Iron - Alloys||15-30|
|Steel - Medium Carbon||35|
|Stainless Steel - 300 Series||10-20|
|Stainless Steel - 400 Series||15|
|Zinc - Diecasting||80|