I'm getting familiar with my new-to-me 1960's South Bend 10" lathe. I've been using a ShopTask BridgeMill 3-in-1. The tool post on that was mounted to the table so you had very fine manual control of the lateral movement.
This South Bend only has the handwheel which moves the carriage a lot with just a small motion of the handwheel. I realize that I could use the leadscrew and clutch but (for now) I'm more comfortable manually moving the carriage for some operations.
So far the only workaround that I've found is to manually rotate the leadscrew with the half-nut engaged. I attached a 7/8" socket to spare handwheel to rotate the leadscrew. It's kind of a kludge so I figure there's got to be a "right" way to do it.
South Bend 10" fine feed
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Re: South Bend 10" fine feed
My friend has a relatively expensive English Myford lathe and it has a graduated dial and turning handle on the outboard end of the lead screw for doing just what you are doing to get an unpowered incremental feed on the carriage.
Can't be all wrong if Myford does it.
--earlgo
Can't be all wrong if Myford does it.
--earlgo
Before you do anything, you must do something else first. - Washington's principle.
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Re: South Bend 10" fine feed
What is wrong with setting the cross slide parallel to the ways and using it?
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Re: South Bend 10" fine feed
Setting the compound 90* to the ways is a exclent way of making fine graduated movments.
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Re: South Bend 10" fine feed
Not a thing... other than I hadn't thought about it.Russ Hanscom wrote: ↑Wed Apr 27, 2022 2:40 pm What is wrong with setting the cross slide parallel to the ways and using it?
Re: South Bend 10" fine feed
The cross slide of the typical lathe is not adjustable, thus it can NOT be set parallel to the ways. The compound slide (rest) is adjustable. If you choose to use that setup, the dial may be calibrated in direct movement, so each mark represents a thou of travel. Dials on cross slides can be marked to represent half that, to represent the change in diameter. You would be well served to determine how your dials are marked.VelocityDuck wrote: ↑Wed Apr 27, 2022 3:07 pmNot a thing... other than I hadn't thought about it.Russ Hanscom wrote: ↑Wed Apr 27, 2022 2:40 pm What is wrong with setting the cross slide parallel to the ways and using it?
In spite of the fact that the carriage hand wheel of my Graziano is equipped with a dial, I use a long travel indicator for precise movement. It's fast and easy to use and very precise.
The use of the screw and half nut to propel the carriage should be restricted to single point threading (not for general movement of the carriage). By restricting the use of those components, you'll prolong their useful life. If they are used routinely for other functions, too much wear can be expected, with the outcome being one of the screw no longer being able to create a faithful lead. When the lead screw is used for power feed, there's usually a slot in the screw, which drives the feed mechanism. In that case, the half nut is not employed.
H
Wise people talk because they have something to say. Fools talk because they have to say something.
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Re: South Bend 10" fine feed
Sorry, wrong terminology.