PM 1030 Threading Gears question

[NavyShooter]

Good evening all,

I'm trying to do a bit of threading with my lathe, and need to cut 18TPI.

Alas, the change gears called for in the manual is:

Z2 - 55 T
Z3 - 60 T
Z4 - 50 T
Lower Gear - 60 T

Problem is - I have looked through my kit, and looked at every gear, and I do not have 2x 60T gears.

I only have 1.

Am I supposed to have 2? Or is there another option for 18T that I don't see?

Thanks!

NS

 

[Jim F]

Page 15 here shows 55-60- 50-75


PM1030V.PDF

 

[NavyShooter]

OK, I'll go try that and see what the scratch pass does.

Found another chart that gives 2 more options:

H - 70
50 - 60
75 - H

Or,

H - 65
20 - 45
80 - H

I'll see what might work.

 

[Jim F]

I'm glad I have a SB9, 24 spur, 80 idler and 54 screw.

 

[NavyShooter]

And....that worked perfectly!

 

[Jim F]

Which train did you use ?

 

[NavyShooter]

The 55-60- 50-75

 

[NavyShooter]

Threading worked great - but I snugged down the steady rest a bit too much - and blew the fuse. Of course I don't have a spare of the right size, so I'm offline until at least Monday. Damn.