1. #1
    A few months back I drew up a TTS/R8 style spindle to make sure the machine I am building would allow me to upgrade should I decide to go that way. Here is an overview of the basic parts:

    Click image for larger version. 

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    I'm probably 6 months away from building this, if I ever do, but Chaz asked for more info about it recently so here are a few sketches and the key parts as IGES files (see attachment). Fusion 360 can read these no problem so you can have a look.

    Click image for larger version. 

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    Click image for larger version. 

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    I drew this quite quickly and have not spent time on the details - for example there is no labyrinth seal at the bottom of the spindle to stop the swarf getting into the bearings. Also the upper bearings are a simple sliding fit in the housing to allow for expansion but some designs have a wavy washer to allow movement but keep a small pre-load to prevent the bearing chattering.
    For info I was planning to run it off my WC spindle via pulley(s).

    Anyway here it is, maybe it will give you a place to start or some ideas.

    Some of the advantages of this system are:
    1. Pulley driven so allows step down of speed, step up of torque
    2. Lower speed and higher torque allows larger diameter tools to hog material away
    3. Option to add a power draw bar for quick tool changes (air cylinder arrangement squeezes the draw bar against the spindle shaft to push the collet out)
    4. Uses an off-the-shelf R8 collet (3/4")
    5. Uses an off-the-shelf TTS holder
    6. Main body is 80 mm diameter so could drop into standard WC spindle mount
    7. Tools remain in TTS holder which references against a shoulder when fitted so Z height is known

    This is what it would look like in my Z axis:
    Click image for larger version. 

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    Attached Files Attached Files
    Last edited by routercnc; 23-07-2017 at 10:05 PM.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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