Robert,
I'm just thinking of the lever to actuate the power cross feed but the rest is all interesting!
Thanks,
Dave
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On February 23, 2019 at 5:15 PM "Robert Downs via Groups.Io" <wa5cab@...> wrote:
Dave,
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The following assumes that you were actually referring to a lever operated cross feed for the 3991.
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If you were actually referring to the lever actuated power crossfeed on the final version 12¡±, it can be retrofitted to the 3991.? You will need to drill and tap two holes in the apron plus acquire the necessary parts.? You might be able to buy them from Clausing.? And just ignore the rest of this.
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Otherwise,
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Up until about 1965, Atlas (or Clausing) sold what they called a Cross Slide Turret that replaced the standard cross slide and compound.? From the mid 1930¡¯s until 1956, they sold a 10¡± and a 12¡± version (or they sold the 10¡± and Sears sold the 12¡±).? From 1957 until 1966 they sold a revised version for the 12¡± and although probably still available, the 10¡± wasn¡¯t in the catalogs.? Anyway, as an option, they sold the No. 710 Lever Operator, which would fit your 3991.
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To see what it looks like, log into the A-C group on groups.io and go to Files.? Click on 28 Manuals, Atlas or Atlas-Craftsman Lathe Accessories.? Find and download Atlas Cross Slide Turret No. 6637 For Late12" .pdf?.? The lever and all of the parts associated with it are shown in there.? From the disassembly instructions prior to the lever assembly, I believe that one thing is missing.? I think that you will need to remove the spur gear and woodruff key that you will find on the cross-feed screw after you remove the bearing and then remove the screw.
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The link that ties the bottom of the lever to the apron attaches to an existing screw (or a slightly longer version of it) on the front of the apron.
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Probably the reason that the lever isn¡¯t in the catalogs after 1965 is that the link would be in the way of the power cross feed lever that isn¡¯t present on a 3991.
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Hi Guys,
Has anyone added/retrofitted a lever actuated cross feed to something similar to a 12X36 Atlas 3991?
I have thoughts, all easy but open to ideas. On small stuff I just feed by hand at home or at work but don't like the "yank the knob" engagement.
Thanks, Dave
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