How to Use a Metal Lathe: Gap Bed Lathe Machine ...

1.Longitudinal handwheel of counter-clockwise turning slide box 24，Turn the slide box longitudinal handwheel clockwise 24，and move the saddle to the right. Each grid on the lathe dial is 1 mm.
Operation a Longitudinal feed 150 mm, then longitudinally retracted 130 mm.
Operation b Return 20 mm longitudinally and 186 mm longitudinally.

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2.Turn the tool holder clockwise (middle slide handle)23，The tool holder moves away from the operator (ie, laterally into the tool); otherwise, it is laterally retracted.
In the middle skateboard scale exercise, it is required to move at a slow speed, requiring both hands to alternate and move freely, distinguishing the direction of retracting and retracting, and the reaction is flexible and the movement is accurate.
The plate on the plate is 0. 05 mm.
Operation a Adjust the slide scale to zero position and feed in the horizontal direction 2 m m.
Operation b Adjust the slide scale to 25 and the horizontal return to 1mm.

3.Turn the small slider handle clockwise to move the small slider forward; turn the small slider handle counterclockwise to move the tool holder to the rear.
The small skateboard scale exercises require a slow and even movement, requiring both hands to move alternately.
Each grid on the small skateboard dial is 0. 05 mm, and the week is 100 grids.
The correspondence between the face scale and the number of cells.
Operation a Adjust the small slide scale to zero position and feed longitudinally 3 mm.
Operation b Adjust the small slide to a size of 42 and the longitudinal direction back to 12. 5 mm.

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Originally Posted by

IT is a VERY rare 3 jaw chuch mounted to anything that will hold the same tolerance when clamped to a 1" part as it will when clamped to a 3" part.

My G4003 Grizly lathe had specs provide when it was certed at the factor and they were better than 0.001 BUt as soon as you move it, all bets are off.

Unless the lathe is reset, leveled and recerted/aligned properly on a solid stand and level floor, you'll never see the same specs it saw on the floor when certed as opposed to just being dropped off the truck at your shop.

I'd be inclined to rank the ascending quality as Harbor Freight then Grizzly then Jet. WIth care, most of anything they sell will match or outperform a tired Atlas, West Bend or other domestic long out of production lathe.

For a cheap starter, go Harbor. For an affordable hobby and light/moderate duty shop use item, go Grizzly. For a true commercial shop, go Jet or better.

A "grand daddy" that is operational is worth the cost to refurbish as they are true, kick A$$ commercial, tool room quality lathes designed and built for 100% plus duty cycles.

The "tool room" lathes from Hardinge are true jewelry - with a cost to match.

Tiger's explanation is about as clear and consise ans one could ask for.

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