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Thread: THE GRIZZ

  1. #613
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    Default Re: THE GRIZZ

    Jeff,

    I'll answer for Nick if i may,

    Thanks for the positive comments. If you look at our post #73 you will see the Bellevilles and how they are stacked. They give us a little over 4000 lbs of pull on the toolholder. This obviously required some type of drawbar that can compress that force to release the toolholder, hence our air-over-hydraulic intensifier and home made hydraulic cylinder.

    With only 50 psi of air, the intensifier when can develop over 4700 pounds of squeeze on the drawbar to release the tool. If we mistakenly applied 100psi to the system we could get almost 10,000 pounds at the cylinder, which of course would be the end of the Grizz for sure..

    On the Haimer, the little instruction sheet that came with our ZeroMaster shows the simple procedure to adjust the 'nul'..meaning the adjustment to align the indicator hand with dead zero at rest. Have you tried that, it's simple and done without digging into the instrument.

    Stuart

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  2. #614
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    Default Re: THE GRIZZ

    Big thank you to friend "CS900" !!!! Super awesome!! The care package of regrind end mills is amazing. Truly appreciated.

    - Nick / Stuart








    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  3. #615
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    Default Re: THE GRIZZ

    I want to see the long one in action on the grizz!



  4. #616
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    Default Re: THE GRIZZ

    Quote Originally Posted by CS900 View Post
    I want to see the long one in action on the grizz!
    Cliff,

    Nick says he has a piece of Kryptonite all lined up to cut down with that 'long mother rougher'

    Stuart

    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


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    Default Re: THE GRIZZ

    Quote Originally Posted by atomarc View Post
    Cliff,

    Nick says he has a piece of Kryptonite all lined up to cut down with that 'long mother rougher'

    Stuart
    I for one, look forward to that video!



  6. #618
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    Default Re: THE GRIZZ

    Stuart, I got the Belleview springs figured out for the drawbar. I appreciate your help. I have a question for you. I had a drawbar turned on a lathe from a machine shop as I did not want to use all thread. I thought that the all thread draw bar was bent, well it was not. The TTS collet I was using was actually .023 out of round in other words the center of the hole was not concentric. We put the draw bar in the lathe chuck with the collet attached and it was pretty sad to see. Well that carries up to the belleviews and to the draw bar nut. I tired a different Collet from lindsy and even a bridgeport, same thing.

    Out of all that rambling on, did you have a problem with yours of did you use some kind of centering taper like on a bridgeport to center the draw bar in the spindle?

    Jeff



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    Default Re: THE GRIZZ

    Stuart, I found the post where you showed how you did what I was asking. Nice job on that! My setup is different than how you did it but I have an idea of how I can fix it.

    Jeff



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    Default Re: THE GRIZZ

    Jeff,

    I'm not 100% clear on your question. I made my own drawbar and was very careful to keep everything concentric. The threads were single pointed in the lathe making sure the bar stock had zero runout. The drawbar screws into a Tormach R8 collet that is ground specifically for their TTS style tool holders. When a toolholder is stuck into the spindle and indicated with a DTI I'm getting under 2 tenths runout..hardly readable.

    I can't second guess your measuring methods but I would think .023 runout on a ground tool holder to be next to impossible. If the spindle has zero runout and you install a quality R8 collet, it would ideally have zero runout and if a TTS tool holder was installed in the R8 collet, it too should ideally have zero runout.

    My gut guess is that the folks that cut the threads on the drawbar chucked it up in a 3 jaw that had runout, then stuck a die holder in the tailstock and cut the threads with that. It wouldn't get much more inaccurate than that. It sounds like you're screwing collets to the threads of the drawbar mounted in the lathe, watching the collet wobble and blaming it on the collet. I would blame it on the funky drawbar. This could all be verified by dialing in the drawbar in a 4 jaw, then screwing a collet on.

    Prove the drawbar first..it will probably be the culprit.

    To expound a bit on my drawbar, the top end was machined for a nice slip fit in my top hat what ran concentric to the hollow spindle/drawbar tube. This meant that the top wouldn't flop around as the machine ran. Again, post #73 in our thread shows the construction of the drawbar.

    I hope this makes sense and answers some of your questions, or helps lead you in a direction to find a solution. Keep us posted.

    Stuart

    Last edited by atomarc; Today at 01:18 AM.
    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  9. #621
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    Default Re: THE GRIZZ

    Some straggler photos from the other day... I have to get at least one use out of them!













    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


  10. #622
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    Default Re: THE GRIZZ

    During the build we planned for some sort of program controlled "air blast" whether the ends up as a fog buster or plain air.... or something in between. Stuart and I had some fun in the shop and came up with a simple way to implement air blast. A few bits of brass and some tube. 2 part epoxy into nozzle. 1...2...3 "bobs you uncle" ... ehhh, idk just yet. some messing / modification still to do. During my planned prototype "air master blaster 5000XL" test the VFD faulted, causing the machine to go into a e-stop state. It worked rather nicely! Going to further investigate the drive tomorrow. the error code hits to some sort of over current protection, use set i hope!!

    Cheers!






    FOCUS!!!!


    Free hand with a wee ball endmill, makes set up for soldering much easier due to brass tubes self aligning on the "fish-mouths"...the rest is "bling"


    The bits, and a few "test pieces"...








    "THE GRIZZ" photo album - https://goo.gl/photos/yLLp61jooprtYzFK7
    Youtube - https://www.youtube.com/channel/UCT2lq9obzEnlEu-M56ZzT_A


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