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Mini Mill Torsion Arm Screw

Discussion in 'MINI-LATHE & MINI-MILL INFORMATION' started by ferlum, Feb 16, 2017.

  1. ferlum

    ferlum United States Active Member Active Member

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    Figured I'd post this here in case anyone else runs into the same problem, and as a heads up to check your machine if you're still using the torsion spring arm like me (haven't gotten around to the air spring upgrade).

    I had a thin workpiece clamped directly to the table and couldn't lower the head far enough to do what I needed. It was bottoming out in the torsion spring arm so I had to take it apart to get the extra inch. Once apart I discovered that the big screw was badly worn. See pic. LMS has replacements but they're more $ than I think they're worth so I got this shoulder screw from McMaster for much less.

    Anyone still using the torsion spring might want to check the screw for wear -- it could get ugly if that thing lets go.

    The shoulder screw is 10 mm Diameter x 12 mm Long Shoulder, M8 x 1.25 mm Thread Size

    McMaster PN 92981A300

    bmac2, roghmc, clevinski and 4 others like this.

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