Calculated Industries 4087 User Manual

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46 — Machinist calc™ Profractional Thread SizeFind the available Internal and External Thread characteristicsfor a 1/4-28 screw.KeySTROKe DISPLAyg * ALL CLeARed1. Verify Thread Class is set to 2B:gb(Thread Class) INT 2b2. Enter the Thread Size:1/4t SIZe 1/4 – INCH3. Enter the TPI and store the final Thread Size:28t THReD SIZe $ 1/4 – 28 INCH4. Find the available Internal Thread characteristics:t(Cut Tap Drill Size) TAP DRILL SIZe 3t(Roll Tap Drill Size) R-TAP DRILL SIZe 5.9 MMt(Close Fit Drill Size) CLOSe DRILL SIZe ft(Free Fit Drill Size) fRee DRILL SIZe Ht(Min. Internal Pitch Diameter) PTCH- SIZe 0.2268 INCHt(Max. Internal Pitch Diameter) PTCH+ SIZe 0.2311 INCHt(Min. Internal Minor Diameter) MINR- SIZe 0.2110 INCHt(Max. Internal Minor Diameter) MINR+ SIZe 0.2200 INCHt(Min. Internal Major Diameter) MAJR- SIZe 0.2500 INCH5. Switch to Thread Class 2A and find the available ExternalThread characteristics:gbb(Thread Class) eXT 2At THReD SIZe $ 1/4 – 28 INCHt(Rod Size for Thread Cutting) ROD SIZe 0.2500 INCHt(Rod Size for Cold Forming) CfORM SIZe 0.2239 INCHt(Max. External Pitch Diameter) PTCH+ SIZe 0.2258 INCH