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IndustryArena Forum > MetalWorking Machines > Mikinimech > New upgrades to the ole Mikini. Servos!
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  1. #25
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    Re: New upgrades to the ole Mikini. Servos!

    Excellent work!

    For reference here is the BT30 spindle in the SVM-2 head. The pink drawings are my 2hp Black Max motor.
    Attachment 425532
    Attachment 425534

    Hmm, the SVM-2 head is looking more attractive now if I could just get it to fit on the linear guides and the ballscrew bearing.
    warmachinellc.com

  2. #26
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    Re: New upgrades to the ole Mikini. Servos!

    Yep, that BlackMax looks painfully familiar.

    To be honest, I think it'll be less work to make a top plate and a spindle reinforcing collar thing than fitting a new head. And if I ever switch motors it'll be pretty easy to redrill or make a new top plate - or even a sub-plate.

    If it goes poorly, I'll just get some plate and weld/bolt up a new head with the dimensions & features I want. I'm not spending a pantload more on this thing - if I want an ATC or 5th axis, I'll have to find time to make it myself.

  3. #27
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    Re: New upgrades to the ole Mikini. Servos!

    Here are the Mikini head specs directly from Skyfire:

    Attachment 425642
    Attachment 425644
    Attachment 425646

    Here are some measurements from the 3D model of the Skyfire SVM-2 head:

    Attachment 425648
    Attachment 425650

    As you can see they are almost identical.
    warmachinellc.com

  4. #28
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    Re: New upgrades to the ole Mikini. Servos!

    Yep, they're close. Did Jan explain why it was such a PITA to swap heads?

    And do you have any other Mikini drawings?

    EDIT - you're right, they are about identical. I don't see why it wouldn't bolt up. And I don't see why the bearing blocks and ball screw wouldn't bolt up - center to centers and the nut flange circle are the same. The ballscrew nut might need a shim sleeve, but that's stupid easy on a lathe.

    Thinking discount on a 2-pack from China?

  5. #29
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    Re: New upgrades to the ole Mikini. Servos!

    Quote Originally Posted by spumco View Post
    Yep, they're close. Did Jan explain why it was such a PITA to swap heads?

    And do you have any other Mikini drawings?
    No those are all the drawings I have. He said that the bore for the ball screw bearing was 1mm off and he needed to make some kind of spacer. He couldn't route the oil lines in the head and had to run them on the outside. Also it took forever to get it back in tram. Curiously he said the center center distance between the rails on his machine was 120mm. I measured and mine is 128mm just like the drawing. Some column castings don't have a way to access the linear bearing guide bolts from the back. Mine does, as did his, but like his mine are very small and probably need to be drilled out.

    Defeng tells me that the SVM-2 uses larger ballscrews and larger linear ways, however from what I can tell at least the ball screws are the same (2005). The linear ways are similar sized but are a different type (RGW25 type).
    warmachinellc.com

  6. #30
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    Re: New upgrades to the ole Mikini. Servos!

    Thanks for the details. I think I'm back to the adapter plates.

    I've got a plasma table control system to build first, but once that's done I'm going to start tearing the old Turdkini apart.

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