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All Springer/NP/PCP Air Gun Discussion General > Machine Shop Talk & AG Parts Machining

Cutting left-hand threads on a Chinese small lathe?

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happymecanic:

--- Quote from: Rob M on March 06, 2023, 06:54:55 PM ---

kwk posted a tailstock leadscrew, and i got mixed up lol

--- End quote ---

OK I understand now ;). Interesting coincidence that I also want to use a leadscrew (from my old mini-lathe) to move the tailstock 8).


--- Quote from: KWK on March 07, 2023, 10:33:13 PM ---Ok, I'll take the blame. LOL

This really is an interesting post. All this with a china lathe and milling attachment. Industrious man. Keep going.

--- End quote ---

Lol! Thank you Karl!

I've checked the prices for gears, and I'd be in for over 250 Cad. bucks if I'd buy them, and this is for plastic gears. The reverse tumbler itself isn't even commercially available, so I have no choice but to make it. This must be my most elaborate machining project yet, and probably the most interesting :D.

KWK:
Do you see here how this reverse tumbler set adjusts lash? From a South Bend 9. Very handy. I have the end gears on my 1947 South Bend running quieter than my 1960's version with the non-adjustable plunger style. I can't stand a jingly lathe in my home shop. Especially if it doesn't have to be that way. I tried plastic but found no improvement over well adjusted steel gears

happymecanic:

--- Quote from: KWK on March 08, 2023, 12:02:18 PM ---Do you see here how this reverse tumbler set adjusts lash?

--- End quote ---

I think I do see grub screws in the ends of the slot, isn't it? I agree it's a good way to adjust lash. Thanks for posting the picture, I'll try to include that feature in my tumbler!


--- Quote from: KWK on March 08, 2023, 12:02:18 PM --- I tried plastic but found no improvement over well adjusted steel gears

--- End quote ---

Totally true!

KWK:
How's it coming?

WobblyHand:
It's been a while, any progress?

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