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  1. #1
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    2,312

    Default Solid Toolpost Mount for my Hercus 260

    Hi All,
    My 260 has one of Mal's slotted cross slides fitted. I decided to take advantage of the t-slots and made a solid toolpost mount to replace the topslide when its features aren't needed.

    I started by making a spigot to the same dimensions as the one on the topslide. It has 6mm extra length to allow it to be shrink-fitted into a bore in the block.

    I took a 125 long piece of 100x50 1020 mild steel. Milled it to the same thickness as the topslide and squared up all faces. Mounted the block in a 4-jaw chuck and bored a 6mm deep pocket slightly smaller than the OD of the spigot.
    Heated the block to 200C in the oven and cooled the spigot in the freezer. I was hoping the spigot would drop easily into the hole. However it got half way in and froze. I raced out to the workshop and gave the spigot a few whacks with a hammer with a piece of aluminium to protect it. Thankfully that coaxed the spigot the rest of the way in. The M12 cap screw provides peace of mind.

    I also made a ⅞" AF nut with an M12 thread, as I wanted to use the same ring spanner that I use on topslide nut. That nut has a 9/16" thread, but I don't have a 9/16 tap.

    So far it's working well. The real test will be parting-off stainless steel.
    Attached Images Attached Images
    Chris

  2. #2
    Join Date
    Nov 2018
    Location
    Tasmania
    Posts
    63

    Default

    Looks great! I take it the height matches your crosslide so you don't have to adjust tool heights?

    I'm after a slotted slide for my 9inch, but Mal's website is always saying out of stock
    I might just have to make one

  3. #3
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    2,312

    Default

    Quote Originally Posted by TommyGMachining View Post
    I take it the height matches your crosslide so you don't have to adjust tool heights?
    That was the plan, but my unfamiliarity with my mate's milling machine meant I ended up about 0.5mm undersize. I'm going to make a copper shim to fit between the block and the QCTP.
    Chris

  4. #4
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,467

    Default

    I may have one, is your lathe Metric or Imperial?

  5. #5
    Join Date
    Nov 2018
    Location
    Tasmania
    Posts
    63

    Default

    Quote Originally Posted by pipeclay View Post
    I may have one, is your lathe Metric or Imperial?
    I didn't even know they made imperial Hercus lathes
    If you do have a slotted slide I'd be interested

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