Question about threading chart

[lesrhorer]

I recently purchased an 8 x 29 mini-lathe. The below gear change chart for threading was included with the lathe. For what does the character "H" stand in the various sections of the chart?

 

[Lo-Fi]

I'd take a guess that it means no gear in that position. What pitch is your leadscrew?

 

[francist]

I believe we’ve had this come up before, the “H” denotes a spacer in place of a gear.

 

[T Bredehoft]

I believe we’ve had this come up before, the “H” denotes a spacer in place of a gear.

Correct. It holds a single gear in contact with it's adjoining gear which has an other gear on it's shaft.

 

[lesrhorer]

I was guessing that might be the case. Why "H"?

 

[SLK001]

"H" for "Hole"?

 

[Bi11Hudson]

(Fashetious)

Maybe the Chinese word for "spacer" starts with an "H" in english. . .

Intentionally salty and obnoxious. . .

 

[higgite]

H = Hey, put the spacer here!

You're welcome.

Tom

 

[GrumpyGrandpa]

I recently purchased an 8 x 29 mini-lathe. The below gear change chart for threading was included with the lathe. For what does the character "H" stand in the various sections of the chart?

View attachment 374199

I have the same chart and agree with the other responses, spacers. My question is- there doesn't seem to be an option for 16TPI, an i missing something? Is it possible to cut 16tpi with this machine other than using taps and dies?