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ShopTask 1720 XMTC Multifix Toolpost

Adding a proper Quick Change Toolpost to my ShopTask 3-in-1 machine

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This is a sub-project of https://hackaday.io/project/169581-reviving-a-shoptask-1720-xmtc-gold-3-in-1 in which I replace the original lathe toolpost with a Multifix 'A' Quick Change Toolpost. I chose this style of QCTP rather than the Aloris type more common in the US as it seems to me to be a better design, and more suited to a machine which will be getting CNC capabilities in the future.

The original toolpost is a turret type, 75mm on a side with a fixed height set to bring a 12mm lathe tool to the spindle center which is 100mm above the table. The turret sits on a roughly 75mm cubic chunk of cast iron which has a 30mm hole through it and close fitting  t-slot keys. A 30mm rod with an integrated T-nut holds it to the table when tightened by a 12mm threaded rod with a handle on the top. As far as turret toolposts go, it works pretty well. 

A while after purchasing the machine I bought the Shoptask QCTP, which turned out to be proprietary - and poor - design. This toolpost was only offered for a short period and later vanished from the Shoptask website - presumably from embarrassment. While the toolpost itself is effectively junk, it sits on an almost identical cast iron block, complete with t-slot keys. The plan is to recycle this item to support the Multifix. Initial calculations show it to be pretty near the ideal size and height. This will leave the original post intact to keep the machine functional should I  upgrade to a dedicated lathe in future and move the Multifix to that.

The toolpost is on order from pewetools.de and will hopefully be here by Christmas. I have some 12L14 for a new hold-down in the mail from hobbymetalkits.com which may get here by the weekend.

  • Post bottom half

    Alastair Young12/12/2020 at 08:06 0 comments

    I have replicated the profile of the old t-nut onto a 180mm chunk of 1-1/4" 12L14 round bar. Final dimension was snuck up to with 600 grit wet and dry, so it is a closer fit in the block than the original. Turned between centers.

    Nothing more to do till the toolpost arrives.

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