Homann Designs TM20LV (BF20,G0704) conversion - Page 3


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Thread: Homann Designs TM20LV (BF20,G0704) conversion

  1. #25
    Registered phomann's Avatar
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    Default Z-Axis

    I started looking at what will ve required for the Z axis conversion. The Z-axis on the TM20VL is quite different from the grizzly as the crown and pinion is attached an the angle plate that holds the Z-axis bearing.

    Ho remove the Z-axis screw. The bearing plate need to be removed. It is bolted to the side of the column and also has a couple of dowel pins.

    First the Z-axis nut is unscrewed from the head. The bolts holding the plate are removed and a soft mallet is used to knock the plate and the pins out off the column.

    You can see where the bog (body filler putty) has flaked off during the removal.

    The last photo shows the inside of the column. At the bottom you can see the mill stand splash guard

    Attached Thumbnails Attached Thumbnails Homann Designs TM20LV (BF20,G0704) conversion-z-axis_1-jpg   Homann Designs TM20LV (BF20,G0704) conversion-removing-z-drive-jpg   Homann Designs TM20LV (BF20,G0704) conversion-removing-z-drive2-jpg   Homann Designs TM20LV (BF20,G0704) conversion-column-jpg  

    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


  2. #26
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    Before I dismantled the Z-axis I tried to understand a few of the issue I might face in the conversion.

    The Z-nut is right at the bottom of the head as can be seen in the first image.

    As can be seen in the next few images, there is a lot of Z-travel. And, when I put the Z-axis bearing on the top of the column, I'll gain about another 2". Already it can be seen that the top of the tead travels above the top of the column.

    At the moment, the problem I'll likely face is that I won't be able to get the head as low as I like. The last image shows the head in the lowest position.

    Attached Thumbnails Attached Thumbnails Homann Designs TM20LV (BF20,G0704) conversion-z-scew-nut-jpg   Homann Designs TM20LV (BF20,G0704) conversion-z-scew-png   Homann Designs TM20LV (BF20,G0704) conversion-z-travel-png   Homann Designs TM20LV (BF20,G0704) conversion-z-travel2-jpg  

    Homann Designs TM20LV (BF20,G0704) conversion-z-travel3-jpg  
    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


  3. #27
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    I took a photo with the quill fully lowered. Even with this, I don't think it would touch the table. Especially if I was using a smaller bit.
    And once converted to CNC with a timing pulley spindle drive, the quill will be locked in the fully up position.

    Has anybody machined the slot in the Z-axis to give more travel so as to get the head lower?

    I'll have to get a local machine shop to do it as only have a Taig mill.

    Attached Thumbnails Attached Thumbnails Homann Designs TM20LV (BF20,G0704) conversion-z-travel-low-png   Homann Designs TM20LV (BF20,G0704) conversion-z-travel-low2-jpg   Homann Designs TM20LV (BF20,G0704) conversion-z-travelextra-jpg  
    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


  4. #28
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    On the side of the head there is a small glass (plastic actually) window that just looks into the cavity inside the head.

    Does anybody have an idea as to what that is for?

    Attached Thumbnails Attached Thumbnails Homann Designs TM20LV (BF20,G0704) conversion-glass-window-png  
    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


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    On another thread it was mentioned (probably by Hoss, since he is the expert) that perhaps there is another version of this mill that used metal gears, and required an oil fill. The versions with plastic gears use grease instead, so the plastic window is rather redundant.

    Last edited by manton; 08-02-2012 at 03:21 AM. Reason: Added signiture
    Michael Anton
    http://manton.ca - http://laserlight.wikidot.com


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    My Mill has Metal Gears. That said, it does look like a window for checking the oil level.

    Cheers,

    Peter.

    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


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    All three gears are metal? I think the G0704 has a plastic gear for the center one.

    Michael Anton
    http://manton.ca - http://laserlight.wikidot.com


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    Hi Michael,

    Yes they are all metal.

    Cheers,

    Peter.

    Attached Thumbnails Attached Thumbnails Homann Designs TM20LV (BF20,G0704) conversion-head_gears-jpg  
    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


  9. #33
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    Quote Originally Posted by phomann View Post

    Has anybody machined the slot in the Z-axis to give more travel so as to get the head lower?

    I'll have to get a local machine shop to do it as only have a Taig mill.

    Sure, I showed how to do it with hand tools here as an option.
    Projects
    Hoss

    http://www.hossmachine.info - Gosh, you've... really got some nice toys here. - Roy Batty -- http://www.g0704.com - http://www.bf20.com - http://www.g0602.com


  10. #34
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    Hi Hoss,

    Thanks for that. I had it on the DVD all the time.

    Cheers,

    Peter.

    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


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    Peter,

    Moving the Z Axis Nut mount to the middle of the carriage should allow the carriage to go further down. There looks to be enough dovetail to get further travel down. Possible?

    (I haven't torn down my mill to look at these details)



  12. #36
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    Hi,

    The Z-nut has a boss that fits into a machined hole. I'm not sure it would be easy to move.

    Cheers,

    Peter

    -------------------------------------------------
    Homann Designs - http://www.homanndesigns.com


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