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Thread: THE GRIZZ

  1. #37
    Gold Member Fastest1's Avatar
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    Default Re: THE GRIZZ

    Looking good.

    A lazy man does it twice.


  2. #38
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    Default Re: THE GRIZZ

    Finished the spindle pulley today. Over all it turned out pretty well, ground a piece of high speed steel to cut the ribs on the pulley. The pulley goes over what use to be the gears / quill spline thingy, and stabilizes the the splined shaft by fixing it all together. There are 3 pieces of drill rod in the pulley that key it to the splined shaft. The draw bar nut that has yet to be made will thread onto the shaft and hold the pulley down.....








    (machining pulley blank)




    (freshly parted off pulley on expanding mandrel ready to face)









    (3 "key" pin holes made with a 5/16 endmill)



    (finished pulley with pins installed)







    (you get the idea.... pulley is not all the way down on the shaft, its a snug fit fully seated)



    (insert spinning noise here)



    (this is the recess in the underside of the pulley that fits perfectly over the O.D. of the quill drive "barrel')





    (showing what the recess in the underside of the pulley fits over)




    (and...... "Bob's your uncle")








    (remember, when you are measuring for belts, its half the circumference.... not half the diameter!!! lol, ask me how i know. "opens package... WOW, that belt looks really short.... that can't be right.... DOH!)




    Thanks!!!

    Last edited by atomarc; 01-03-2017 at 10:36 PM.


  3. #39
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    Default Re: THE GRIZZ

    Are the photos showing up?



  4. #40
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    Default Re: THE GRIZZ

    Yes looks good. I like that you attached the quill splines for your pulley!



  5. #41
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    Default Re: THE GRIZZ

    Quote Originally Posted by nlancaster View Post
    Yes looks good. I like that you attached the quill splines for your pulley!
    It made more sense to me to power the spindle proper, rather than rely on the sloppy fit of the spline in the broached barrel. Using this method, both the barrel and the spindle are mechanically tied together.

    Stuart



  6. #42
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    Default Re: THE GRIZZ

    Finished up the motor side pulley today. The second pulley went much faster than the first... The UPS man is supposed to be bringing me the correct length belt tomorrow so progress can continue. Up next will be the belt tensioner arrangement and making some clearance for the belt (its a little to close as is).



    (Plans fresh from the engineering department....)





    (Blank chucked up ready to machine)













    (A quick time lapse of drilling the 3 holes that bolt the pulley to the motor flange)





    (a few photos showing the pulley mounted to the motor.... "ready for action")















    (a "cut away" showing the belt drive in its current state)



    Thanks!!!



  7. #43
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    Default Re: THE GRIZZ

    I have a question and I'll ask it here instead of starting a new thread. I have planned on making a weighted base for the Grizzly supplied cabinet that will have adjustable feet, a wider foot print and be ballasted with concrete. This will give the machine a much needed increase in working height and also add some stability.

    Is this a dumb idea? Would I be better served on finding a existing tool cabinet with drawers and mounting the machine on that? The factory stand is cute but doesn't have much storage, especially if one puts a small coolant reservoir and pump on the bottom shelf.

    What have you folks used to raise the working height and/or make the thing a bit less top heavy and 'tippy'?

    Stuart



  8. #44
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    Default Re: THE GRIZZ

    A lot of progress today... Completed the sticker mod and called it a day!











  9. #45
    Gold Member Fastest1's Avatar
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    Default Re: THE GRIZZ

    Quote Originally Posted by atomarc View Post
    A lot of progress today... Completed the sticker mod and called it a day!







    Now that is my pace for a day ;-)

    A lazy man does it twice.


  10. #46
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    Default Re: THE GRIZZ

    I picked up the drive belt from UPS today..it's from McMaster and it's a poly-vee 200J6, which is a J belt, 6 groove and 20" long. It fit perfectly. I ended up with a driver pulley at 3 1/2" and a driven pulley at 2 1/2" which gave me a final ration (over driven) of 1.4:1. With my 1725 motor at 60hz, I'll have a spindle speed of 2415 RPM and when jacked up to 120hz with the frequency drive it will give me 4830 RPM. My son seems to think we need massive RPM's for small end mills zooming through aluminum. The drive is a 1 HP Hitachi sensorless vector unit so hopefully, I will have good power under 60hz and, if need be, and I want to scatter the motor, it will go up to 400hz!

    The use of the Leeson IEC motor and those pulley sizes made everything fit on top of the spindle casting with adequate4 room to tension the belt, for a power drawbar and plenty of room to construct some type of way cover for the upper half of the exposed Z ball screw/column. So far, everything has worked out well...wonder what gremlin is waiting in the wings!

    Stuart

    Last edited by atomarc; 01-06-2017 at 03:26 PM.


  11. #47
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    Default Re: THE GRIZZ

    Update..

    Received some replacement upper bearings for the spindle drive "barrel shaped" thing. Went with some shielded Koyo's. Finished up the motor mount, machined slots into the plate to allow adjustment of belt tension. Also started measuring up what kind of room we have to work with for a power draw bar. Been going back and forth running the numbers and pros and cons of a multi stage pneumatic or air over hydraulic intensifier draw bar..... still thinking about it. Here are some photos & videos from the journey!


    (bearings)




    (had to drill the holes for the motor mount plate to bolt to)











    (motor mount plate showing newly machined slots)











    (motor bolted up with some tension on the belt)













    (Video showing the back of the motor mount plate getting trimmed and beveled on the milling machine)





    (and lastly some photos showing the room we are working with for a power draw bar)






    Thanks! Questions, comments concerns...?

    Last edited by atomarc; 01-14-2017 at 11:19 PM.


  12. #48
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    Default Re: THE GRIZZ

    Stuart & Nick,
    You have done a fantastic job on this conversion. Even though I am converting a RF45 I keep reading back thru this thread to get ideas.
    I might just have to copy the way you attached the spindle pulley, brilliant!

    Any more progress since the last post?

    Kurt



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