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Thread: Vertical shear finishing tool for the lathe - video

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    Jon
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    Vertical shear finishing tool for the lathe - video

    Vertical shear finishing tool for the lathe. By Steve Jordan. 9:31 video:


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    Supporting Member NortonDommi's Avatar
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    I have a couple of those Eccentric Engineering tangential tools and find they do an excellent job as a shear tool when used in reverse i.e. with a RH tool instead of running towards the headstock cut towards the tailstock and vice versa for a LH tool.
    The bit could also be turned through 90 degrees to achieve the same result, I have been means to make a dedicated tool though.

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    Last edited by NortonDommi; Apr 28, 2022 at 04:37 PM.

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    Nice video and post!
    I figure I am eccentric enough to make my own. So I did, but I seldom use it.
    Thanks for posting!
    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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    Supporting Member Floradawg's Avatar
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    Quote Originally Posted by Jon View Post
    Vertical shear finishing tool for the lathe. By Steve Jordan. 9:31 video:

    Great info. Is the traditional cutting speed the same for this tool? Thanks.
    Stupid is forever, ignorance can be fixed.

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    Thanks Steve

    Quote Originally Posted by Jon View Post
    Vertical shear finishing tool for the lathe. By Steve Jordan. 9:31 video:

    Hi Steve. Do you have any thoughts to share about the sensitivity of the finish to different speeds and feed rates? In your examples you look like you're turning at quite a low speed but moderate feed rate.

    Regards

    Andrew

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    Supporting Member tonyfoale's Avatar
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    Quote Originally Posted by NortonDommi View Post
    I have a couple of those Eccentric Engineering tangential tools and find they do an excellent job as a shear tool when used in reverse i.e. with a RH tool instead of running towards the headstock cut towards the tailstock and vice versa for a LH tool.
    The bit could also be turned through 90 degrees to achieve the same result, I have been means to make a dedicated tool though.
    I made an indexable carbide tip version by machining the sides of the tool holder to 15 deg. There is a full description here

    Shear tools for lathe work.

    Vertical shear finishing tool for the lathe - video-sheartool-01.jpg Click image for full size.

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    Supporting Member Hans Pearson's Avatar
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    The shear tool is extremely useful for obtaining very close tolerance finishes, down to exactly on size.

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    Supporting Member Toolmaker51's Avatar
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    One could create a formula, though a clear method escapes me. Perhaps recording of result is a better term.

    Any rate, shearing differs from conventional turning that periphery and cutter are close to alignment, instead perpendicular. Spiral of chip shows that, something (barely) like a drill bit.
    The lowered speed, high feed is a low temperature cut; transverse cut engages marginally wider area like deeper cut with radius tool. The finish might improve lowering feedrate more, with a diminishing return.

    Job shop wise, we ground the bits on a surface grinder, stoning the leading edge. Without access to a rubber roll grinder, this worked on feed spools, like no perpendicular might.
    Sincerely,
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    Supporting Member Bony's Avatar
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    I noticed some chatter whilst turning that you quickly averted. That suggests to me either a lack of rigidity (which doesn't seem to be the problem) or that the tool bit is no longer cutting but simply rubbing, which of course needs to be avoided. Any comments?

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    Vertical Shear Tool

    In my own experience these vertical shear tools donít do a good job of turning to a square shoulder. Am I expecting too much of this tool?
    Dick


    Links to some of my plans:

    https://www.homemadetools.net/forum/...965#post105972 OFF-SET TAILSTOCK CENTER PLANS
    http://www.homemadetools.net/forum/s...995#post112113 SMALL TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/l...994#post112111 LARGE TURRET TOOL POST PLANS
    http://www.homemadetools.net/forum/m...383#post110340 MINI-LATHE CARRIAGE LOCK PLANS
    http://www.homemadetools.net/forum/s...191#post106483 SMALL QC TOOL POST PLANS
    http://www.homemadetools.net/forum/q...849#post119345 QUICK CHANGE LATHE TURRET
    http://www.homemadetools.net/forum/m...949#post119893 MINI LATHE COMPOUND PIVOT MODIFICATION

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