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Thread: THE GRIZZ

  1. #49
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    Default Re: THE GRIZZ

    Quote Originally Posted by KCJ View Post
    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
    Kurt,

    Thanks for the kind comments, and yes, we're still slaving away. I purchased all the stuff to build a DIY air over hydraulic power draw bar...then purchased all the stuff to build a multi-stage pneumatic draw bar..then purchased a factory Enerpac air-hydraulic booster off a gent on eBay to go the hydraulic route again. I don't have a clue on what I'm doing but have all the crap to head off in any direction I want...LOL

    My big holdup right now is trying to figure out Belleville washers. I have read all of Ray's posts on PDB's, have scoured the net and downloaded informational papers and I've even called Century spring and talked to them. I'm still baffled...probably making it a whole lot more complicated than it really is.

    I won't let this thread die..Nick and I will be posting more stuff very soon...as soon as I graduate from 'Belleville 101".

    Stuart

    Last edited by atomarc; 01-29-2017 at 02:28 AM.


  2. #50
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    Default Re: THE GRIZZ

    Awesome build! Keep up the great work!

    Sent from my QTAIR7 using Tapatalk



  3. #51
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    Default Re: THE GRIZZ

    I run my G0704 at 4500 rpm 95% of the time. I rarely run it lower than 3000 rpm. Almost everything I machine is aluminum though.

    Quote Originally Posted by atomarc View Post
    ... it will give me 4830 RPM. My son seems to think we need massive RPM's for small end mills zooming through aluminum.




  4. #52
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    Default Re: THE GRIZZ

    Hello! Back with a long over due update! We have been working on the power draw-bar cylinder. Borrowed some parts from a 2 inch pneumatic cylinder ( the piston, shaft and cylinder) to build the new hydraulic cylinder. The draw-bar cylinder will be connected to a Enerpac 16 to 1 hydraulic intensifier. Being that we have more than enough draw-bar pressure at our disposable the bellville stack will be between 3500-4000 pounds. Now that the cylinder is pretty much wrapped up, the plan is to build the rest of the draw-bar around it... stay tuned and feel free to ask any questions.



    (The shaft and piston from the donor cylinder......... and the blue print for the cylinder (lol) )





    (The cylinder sleeve)





    (The outer cylinder on the lathe)





    (Steel cylinder ready to have sleeve pressed and glued in)





    (Apply sleeve retainer and insert)





    (You can see the sleeve and the end cap / cylinder mount screw holes)





    (The piston, return spring(a stiff valve spring that was shortened), and the re-purposed aluminum internal stop)

















    (Cylinder with shortened / adjustable shaft. The little hole in the body of the cylinder is a vent)









    (The project manager making her rounds)



    Thanks!!!



  5. #53
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    Default Re: THE GRIZZ

    It looks great. How about a few shots of the intensifier?

    A lazy man does it twice.


  6. #54
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    Default Re: THE GRIZZ

    Here are some photos of the Enerpac intensifier. Picked it up on ebay for great price, its a older model but seems to work great.











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    Default Re: THE GRIZZ

    I would love to see you go full linear with this build. You have all the tools you need to do it



  8. #56
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    Default Re: THE GRIZZ

    This project is a real learning experience for me and I'm spending some nice time in the shop with my son. I'm not sure I consider the G0704 to be a real workhorse of a machine...at least for the kind of work I'm used to, but the CNC aspect of it may open up my eyes a bit. If I were to go crazy on this stuff I think I would contemplate a large gantry type machine with servo's and automatic tool changer. For right now...at the ripe age of 70, the little Grizz is more than enough.

    Stuart



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    Default Re: THE GRIZZ

    Quote Originally Posted by atomarc View Post
    This project is a real learning experience for me and I'm spending some nice time in the shop with my son. I'm not sure I consider the G0704 to be a real workhorse of a machine...at least for the kind of work I'm used to, but the CNC aspect of it may open up my eyes a bit. If I were to go crazy on this stuff I think I would contemplate a large gantry type machine with servo's and automatic tool changer. For right now...at the ripe age of 70, the little Grizz is more than enough.

    Stuart
    Once it is finished and running making parts I think you will be amazed at what it can accomplish with some good cam programming.

    Sent from my XT1585 using Tapatalk



  10. #58
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    Default Re: THE GRIZZ

    Quote Originally Posted by lcvette View Post
    Once it is finished and running making parts I think you will be amazed at what it can accomplish with some good cam programming.

    Sent from my XT1585 using Tapatalk
    I think you are spot on. I bought my son a 3-D printer last year and was absolutely amazed at what it could do and with such accuracy. I'm sure this machine, if it works out at all, will blow my socks off.

    Stuart



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    Default Re: THE GRIZZ

    No pictures today, but an update nonetheless. I started making the 'top hat' for the power draw bar today and things went sour in a hurry. The top of the spindle on these machines is threaded 20mm X 1.0. My design called for my top hat to screw onto these threads which would also secure the poly belt pulley to the spindle. After hours of fussing it finally became apparent that the factory threads were cut slightly out of line with the spindle axis. How this happened is beyond me! This wouldn't allow the top hat to seat flat on the pulley and also resulted in about .015 of lateral run out.

    As Nick (my son) stated..if nothing else is done right on this conversion, the spindle has to be perfect. It must be balanced, true and quiet. The Chinese thread job was not going to let that happen.

    So...3/4" X 16 TPI is real close to the existing size, but not much would be left of the threads if I merely threaded over the existing ones. My plan is to tig weld up the threaded portion, then single point it 'dead nuts' in the lathe with the new 3/4" X 16 thread.

    I'll take my camera down to the shop and get some pictures of this when I do it.

    Stuart



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    Default Re: THE GRIZZ

    I had success re-treading the end of the spindle!!! It was quite the task setting up the spindle in the lathe and dialing everything in perfect. 3/4 - 16 threads were single pointed after the spindle was setup in the lathe. Now time to proceed with the top hat portion that will thread onto the newly corrected spindle threads. Also picked up some 4140 for the clamping part of the power draw-bar as was as the draw-bar its self!



    (newly "minted" threads!!!)









    (top hat in progress)






    (top hat progressing....)





    (soon to be "clampy" part of draw-bar)





    (the thing that says draw-bar on it....)



    Thanks!!!

    Last edited by atomarc; 02-14-2017 at 09:37 PM.


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