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    Default THE GRIZZ

    Bought a G0704 a few months ago... In the process of doing a CNC conversion on it.

    The plan.

    - hiwin linear rails on Z axis
    - 2 inch head & column spacer
    - 1hp 3 phase 56c motor
    - belt drive
    - double nut ball screws
    - oil system for ways
    - grease system for screws
    -power draw-bar (air over hydraulic)
    - flood coolant

    Electronics.

    - Mach 4
    - intel NUC
    - ESS smoothstepper
    - mx3660 driver
    - 48v 12.5amp power supply
    - nema 23 570oz stepper (x/y)
    - nema 34 906oz stepper (z)
    - hitachi VFD (modbus)




    Fresh off the boat....


    The hiwin linear rails where the first task to be tackled. 15mm CA preload. Milled off the dovetails in the kneemill. Turned out really great.....










    Milling the Z axis slide for the linear rail "cars"


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    Default Re: THE GRIZZ

    Z axis slide milled and drilled for the linear rail cars.






    Now comes the head spacer. Started with a hunk of 2 inch mic-6 aluminum.


    After some milling... pay no attention the minor mess up lol (started to bore hole in the wrong place!) we where able to recover nicely in the end!


    gettin there...


    there we are!!!






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    Default Re: THE GRIZZ

    Column spacer.... started off with a big chunk of steel. used an equally large face mill to get it to size and then off to the surface grinder it went. The column spacer is keyed to the base of the milling machine and has 2 additional cap screws to hold it in place while putting the main column bolts in.





    setting up the base to mill key slot.









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    Default Re: THE GRIZZ

    key slot cut and two spacer block retaining bolts drilled and tapped


    bolted on to the base.




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    Default Re: THE GRIZZ

    some other random tidbits.

    turned off the gear portion of the quill drive "barrel" (more on this when its time to make the belt drive)


    set screw holes that lock the quill from moving.


    made a wrench for one of the spindle bearings.


    some new extended head bolts. turned the heads of the bolts down. ground some flats on some thick washers, and brazed them together.




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    Default Re: THE GRIZZ

    Today i made some headway on the x & y ball-nut grease setup. it has been a struggle to fit everything nicely under the table and not have it look like a drunken madman attacked it with miles of tubing. one grease zerk on the side of the saddle feeds both x and y ball-nuts. There will be a separate system attached to a "one shot" oilier for the ways....





    cleaned up the underside of the table and made some clearence for one of the fittings feeding the ball nuts.




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    Default Re: THE GRIZZ

    Purchased a 4in "cnc" vise.... i believe it was a shars. Overall i was happy with the quality, the one thing that really bothered me was how horrible the screw fit in the base of the vise. When it was all said and done i i added a thrust bearing to the outside, made a new collar / bearing holder and bushed the shaft part of the screw... also moved the grease zerk to the front of the vise. It was a fun little project. Now i have a semi nice feeling Chinese vise! haha







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    Default Re: THE GRIZZ

    just recieved my VFD in the mail today. Does anyone know if i will need any specific hardware to interface between the VFD and MACH? thanks!!





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    Default Re: THE GRIZZ

    Really nice work on the 704.

    Generally the Z is fairly good on the 704 with the head being light and the Z slide being nice and long but you made fitting the rails look like a two hour project and they fit quite nice. Super clean.

    Did the oil fitting on the X clear the table, Its so tight under there?

    youtube videos of the G0704 under the name arizonavideo99


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    Default Re: THE GRIZZ

    Dave,

    You're right..space is really limited in the X axis under the table. I had to get really creative with the fitting size and position to get them to fit..even with that, you can see in post #6 that I had to relieve the underside to the table a hair. It would be cool if the rotational position of the X axis nut was skewed one hole over so the oil hole would lay down a bit more which would make for a more compact arrangement.

    I built a new Y axis nut retainer that has a oil hole and o-ring arrangement to be able to mount the fitting in a different location. It is also pictured in post #6.

    Getting the lubrication plumbing to be functional and yet look clean isn't a 5 minute job..I still have all the plumbing for the ways to figure out.

    The ball nuts are tapped for M6 X 1.0...this couldn't be a more difficult thread configuration to find fittings for and the hardness of the ball nut precludes any modification..as least by me!

    I will add this. The ball screw assemblies came from Dave at 'arizonavideo' and he bent over backwards to make sure everything was just as ordered. A true gentleman.

    Stuart Miller



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    Default Re: THE GRIZZ

    To rotate the X nut would help to leave room for the Zerk but the mounting would have to change requiring to mill and tap the Y slide.

    For oil I was thinking a plastic tube of the right size to tap to M6 and then put a wire in it to prevent it from kinking then use a heat gut to make a sharp bend.

    What is your plan for the belt drive?

    youtube videos of the G0704 under the name arizonavideo99


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    Default Re: THE GRIZZ

    For the belt drive..I ordered a J section, 4 rib poly belt just to see what it looked like in person. It's the right scale for the machine and will handle the HP just fine. I have read the poly sheaves are easy to make so I'm going to give that a go. The spindle sheave will be a tap fit onto the OD of the splined shaft on the spindle and will also fit down into the ID of that large upper bearing. This plan seems like it will stabilize the upper end of that long splined shaft, giving it more rigidity.

    The driven pulley OD will be based on the available room for the driver OD pulley, and such that it give me a ratio of around 1.44:1..but also allows me a center distance for a off the shelf belt.

    These are my plans..we'll see what reality brings! The timing belt drive was my first choice but my son has read there is more noise associated with it and above all, I'll like this little Chinese bucket of bolts to run smoothly and quietly.

    Stuart



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