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PM-1127 Change Gear Table confusion

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tyronejk

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#1
I have a new 1127 lathe that I'm trying to set up 32 pitch threading on. The threading table provided in the manual and on the lathe list an "H" gear. What is that? Maybe I'm missing something and that "H" isn't a gear at all.

This table is what I'm looking at (32 tpi on the bottom left):
 

ttabbal

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#2
"H" is a spacer. You should have 2 of them in the toolbox that came with the lathe.
 

tyronejk

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#3
Ah perfect. That makes sense. Thanks!
 

ttabbal

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#4
Just in case someone is searching for an issue with metric threads, I'll drop this here.

I did my first metric threads on the PM1127 over the weekend. I was going for M10-1.5. It's on the chart, didn't seem too special. So I set it up and did a scratch pass to test with a pitch gauge. It was oh so slightly off. So I tried it with a metal part and a test nut. Nope. Off a bit. After moving gears around and more test cuts than I want to admit..

I grabbed the 55 instead of the 50. :cower:

Things to learn...

1. Triple check that you have the right gears.

2. ALWAYS do a scratch pass.


That hair will probably grow back, if I don't do anything else stupid for a while... Meh, bald might be less painful! :grin:
 
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