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TORNITORE E FRESATORE |
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Iscritto il: mar apr 19, 2011 08:30 Messaggi: 1421 Località: galgagnano (Lodi )
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Da una domanda su practicalmachinist.com: '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 tradotto velocemente, il tizio sta ricostruendo un trapano il cui mandrino riporta le scritte 2 1/2 tapered ma non trova nessuno che ne vende uno simile e chiede se è sostituibile con il tipo 6 viste le minime differenze; consigli dati: lappa con carta vetrata / incolla con loctite verde / rifai il naso con un filetto, il tizio ha rimesso in servizio il vecchio mandrino riparandolo
I also checked if a JT 2 1/2 exists. It does not. It appears to be an odd ball taper used by Taiwan manufacturers in the 60s and 70s. No one makes a replacement.
_________________ answer to life, the universe and everything = 42 ( Guida galattica per gli autostoppisti )
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