The Jacobs Taper (AKA JT) is commonly used to secure drill press chucks to an arbor. A customer just asked us:
Question: How to measure a Jacobs Taper?
Our Answer: It can be determined by measuring the small and large diameters and then comparing it to this chart.
JT0 Dia2 = .2284 Dia1 = .250
JT1 Dia2 = .3334 Dia1 = .384
JT2 (short) Dia2 = .4876 Dia1 = .5488
JT2 Dia2 = .4876 Dia1 = .559
JT33 Dia2 = .5605 Dia1 = .624
JT6 Dia2 = .6241 Dia1 = .676
JT3 Dia2 = .7461 Dia1 = .811
JT4 Dia2 = 1.0372 Dia1 = 1.124
JT5 Dia2 = 1.3161 Dia1 = 1.413
I'll also include this chart on Morse Tapers because they are a little bit more common. Same idea here, measuring the small and large diameter and compare it to this chart.
MT0 Dia2 = .252 Dia1 = .3561
MT1 Dia2 = .369 Dia1 = .475
MT2 Dia2 = .572 Dia1 = .700
MT3 Dia2 = .778 Dia1 = .938
MT4 Dia2 = 1.020 Dia1 = 1.231
MT4.5 Dia2 = 1.266 Dia1 = 1.500
MT5 Dia2 = 1.475 Dia1 = 1.748
MT6 Dia2 = 2.116 Dia1 = 2.494
MT7 Dia2 = 2.750 Dia1 = 3.270
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