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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Harbor Freight 42827 Build / Conversion Thread
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  1. #1
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    Harbor Freight 42827 Build / Conversion Thread

    I had posted a thread a week or so ago (original thread) about converting the HF 4827 Geared Head Milling Machine. I realize this mill is unpopular because of the round column, but it was a deal I could not pass up. I'll be posting pics & files as I progress.

    My plans for the mill are to use parts off of my router table to convert the mill to a 4 axis cnc using my 4 axis Xylotex board & a rotary table.

    I will also build dampeners based on S_J_H's damper design.

  2. #2
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    Transportation

    I had to take the mill apart in its original location to get it to my garage. It broke down very easily but was still very heavy to move.

    Here is a shot of a few pieces still in my wife's car:

  3. #3
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    Oil Leak

    When I got the machine there was an obvious oil leak coming out of the oil fluid level indicator:



    Based on Grae-Tech's experience, I was afraid there was sand left in the gear head, causing the quill to overheat, damaging the seals. I took the quill apart & inspected the inside but everything looked very clean.



    Looks like the oil fluid level indicator itself was fitted very loosely, so I wrapped Teflon tape around the indicator itself & pressed it back into place. No leaks so far!

  4. #4
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    All Built

    Here is a pic of the re-assembly process. For now I am keeping everything stock. Down the road I'll consider upgrading to ball screws.



    stay tuned!

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    Plans for X-Axis Conversion


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    Plans for Y-Axis Conversion


  7. #7
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    Z- Axis Assembly

    The z-axis seems a bit tricky, as there is no great place to mount the motor support. The closest existing screw holes are located on top of the quill. This setup controls the Spindle Micro Feed Handle - about 5" of z travel.


  8. #8
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    I'll be cutting the motor mounts from aluminum I plan to order from metals depot. They seem to have good prices on aluminum stock.

  9. #9
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    Quote Originally Posted by stabbs View Post
    I'll be cutting the motor mounts from aluminum I plan to order from metals depot. They seem to have good prices on aluminum stock.
    I think you'll find onlinemetals.com is usually cheaper....

    You do realize driving through the quill feed mechanism you will have considerable backlash to deal with?

    Regards,
    Ray L.

  10. #10
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    Thanks for the metal site, Ray. I was not aware of the backlash on the quill feed- can that backlash be tightened?

  11. #11
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    Quote Originally Posted by stabbs View Post
    Thanks for the metal site, Himy. I was not aware of the backlash on the quill feed- can that backlash be tightened?
    You might be able to reduce it, but you can't eliminate it, so there will always be an uncertainty in your quill position, as the cutting forces will push and pull the quill within the range of the backlash. Quill feeds are usually done by driving the quill directly for exactly this reason.

    Regards,
    Ray L.

  12. #12
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    I think you will find that this place is cheaper than both the other places.
    It's where I get most of my metals.
    http://www.speedymetals.com/

    I sometimes use Yarde Metals in the Drop zone, but they rarely have what I need. Cheap though when they do.

    http://www.yarde.com/index.html
    Lee

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