07-13-2013, 06:45 PM
First off I want to thank all the members here. You guys have been great in offering help and suggestions. Hopefully someday I can do the same.
So my next challenge/adventure is going to be threading. I've got a chunk of 1.25" cold rolled about 2.25" or so I want partially turn down then thread for 3/8-16 UNC thread. I assume (and think I've confirmed) that this means I want to turn down the threaded part to Major Dia 3/8" (maybe make that .3745?) and make the threading exit diameter .2983". Does that sound right? I'm going to assume for the moment that I've got that part at least workable but if I'm way off please let me know.
Here's the part where I'm a bit more shaky. Setting the dials and choosing the right change gears for tpi.
The owners manual for my lathe is here,
http://cdn0.grizzly.com/manuals/g9972z_m.pdf the relevant part, I think is page 35.
I set the left dial to I and the right dial to A and in the change gear "a" position I use the 35 change gear AND in the 'b" position I use change gear 70. This should give me a 16 TPI, correct?
So my next challenge/adventure is going to be threading. I've got a chunk of 1.25" cold rolled about 2.25" or so I want partially turn down then thread for 3/8-16 UNC thread. I assume (and think I've confirmed) that this means I want to turn down the threaded part to Major Dia 3/8" (maybe make that .3745?) and make the threading exit diameter .2983". Does that sound right? I'm going to assume for the moment that I've got that part at least workable but if I'm way off please let me know.
Here's the part where I'm a bit more shaky. Setting the dials and choosing the right change gears for tpi.
The owners manual for my lathe is here,
http://cdn0.grizzly.com/manuals/g9972z_m.pdf the relevant part, I think is page 35.
I set the left dial to I and the right dial to A and in the change gear "a" position I use the 35 change gear AND in the 'b" position I use change gear 70. This should give me a 16 TPI, correct?
If it's crazy but it works, it's not crazy.