I'm thinking about having a go at making a collet holder for my lathe that will attach directly to the spindle.
The spindle has a 1.5" 8TPI Unified thread and I'm trying to work out what size I need to bore the hole. From the Machinery's Handbook I worked out that it will be either
Minor Dia External Threads - 1.347"
Minor Dia Internal Threads - 1.365"
But I can't get my head around which of these is correct for this situation - I'm assuming the External Thread diameter but want to be sure.
To be honest given my skills it's probably not going to make a lot of difference but I'd like to be at least aiming at the right size
Cheers
Jim
The spindle has a 1.5" 8TPI Unified thread and I'm trying to work out what size I need to bore the hole. From the Machinery's Handbook I worked out that it will be either
Minor Dia External Threads - 1.347"
Minor Dia Internal Threads - 1.365"
But I can't get my head around which of these is correct for this situation - I'm assuming the External Thread diameter but want to be sure.
To be honest given my skills it's probably not going to make a lot of difference but I'd like to be at least aiming at the right size
Cheers
Jim