Henry Arnold
Aluminum
- Joined
- Jun 17, 2007
- Location
- Orange, CA, USA
I'm rebuilding an old Drill Press that has a chuck which is labeled 2 1/2 Taper. It appears to be a Jacob Taper 2 1/2. Yes there is such a thing. Below is a table I found at Wikipedia.
No one carries JT2.5 Drill Chucks. It looks like the JT6 is very close. Do you think it will be OK or do I need to modify the quill for the JT6?
Thanks
The Jacobs Taper (abbreviated JT) is commonly used to secure drill press chucks to an arbor.
Taper Small End Big End Length
mm inch mm inch mm inch
0...........5.80.......0.2284.....6.35.....0.2500....11.11.....0.4375
1...........8.47.......0.3334.....9.75.....0.3840....16.67.....0.6563
2...........12.39......0.4876....14.20....0.5590....22.23.....0.8750
2 Short...12.39......0.4876....13.94....0.5488....19.05.....0.7500
2½........15.88.......0.625.....17.20....0.677......26.80.....1.055
3...........18.95......0.7461....20.60....0.8110....30.96.....1.2188
4...........26.34......1.0372....28.55....1.1240....42.07.....1.6563
5...........33.43......1.3161....35.89....1.4130....47.63.....1.8750
6...........15.85......0.6241....17.17....0.6760....25.40.....1.0000
33..........14.23......0.5604....15.85....0.6240....25.40.....1.0000
No one carries JT2.5 Drill Chucks. It looks like the JT6 is very close. Do you think it will be OK or do I need to modify the quill for the JT6?
Thanks
The Jacobs Taper (abbreviated JT) is commonly used to secure drill press chucks to an arbor.
Taper Small End Big End Length
mm inch mm inch mm inch
0...........5.80.......0.2284.....6.35.....0.2500....11.11.....0.4375
1...........8.47.......0.3334.....9.75.....0.3840....16.67.....0.6563
2...........12.39......0.4876....14.20....0.5590....22.23.....0.8750
2 Short...12.39......0.4876....13.94....0.5488....19.05.....0.7500
2½........15.88.......0.625.....17.20....0.677......26.80.....1.055
3...........18.95......0.7461....20.60....0.8110....30.96.....1.2188
4...........26.34......1.0372....28.55....1.1240....42.07.....1.6563
5...........33.43......1.3161....35.89....1.4130....47.63.....1.8750
6...........15.85......0.6241....17.17....0.6760....25.40.....1.0000
33..........14.23......0.5604....15.85....0.6240....25.40.....1.0000