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  1. #151
    Quote Originally Posted by JAZZCNC View Post
    No they will be correct, they are twin start screws. If you look carefully at the end you will see multiple threads, but it's easy to check just rotate the ballnut and measure how far it moves.

    It's a common mistake.

    The reason they use this method is it gives higher torque and lessens the depth required and keeps the screw stronger.
    Omg I will be so happy when confirming this. I believe you and Andy. It really sucked out all my energy when measuring today. Now I have hope again!

    I have also received following parts:
    - 4x DMM 400w servo motors and drives. One is with a brake.
    - ATC spindle from Jianken, 3.2kW with BT30 interface, sunfar E550 VFD, Waterpump and 100mm spindle bracket.
    - Aluminium tooling plates from Germany.
    - Ethernet SmoothStepper combined with MB3 breakout board.
    - 1000mm straight edge DIN 874/2 and 300x200 square DIN875/1 from Helios Preisser.
    - 20mm linear rails, 1605 and 2010 ballscrews, cable dragchains from BSTmotion.

    I am still waiting for aluminium profiles and HTD pulleys.

    I will post some pictures soon to show you guys all the hardware.

    Skickat från min SM-A530F via Tapatalk

  2. #152
    Quote Originally Posted by NordicCnc View Post
    Omg I will be so happy when confirming this. I believe you and Andy. It really sucked out all my energy when measuring today. Now I have hope again
    99.9999% Sure they will be correct. I did exactly the same first time I came across them so yes I know that feeling you felt.!
    -use common sense, if you lack it, there is no software to help that.

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  4. Quote Originally Posted by NordicCnc View Post
    I know I said no more changes but I was wrong. I modified the frame and bed quite a bit. All parts are now ordered and the first parts will be arriving in the beginning of next week. The bed will be adjustable in height to allow for higher work parts if ever needed. This is a safety measure so that I don't regret the design. Table will be adjusted with scissor lifts and should be quite easy to realign. I will also add some triangle bracing to the frame, which are not shown in the pictures. These will be made of steel.

    Oh and by the way, budget of 8000€ was not enough, which I expected anyway. It will be closer to 10000€. I am still happy!

    Also JAZZ was right in the beginning of the build log about the total weight. It will be over 400kg once everything is assembled.



    Skickat från min SM-A530F via Tapatalk
    I find it strange in almost every build here, youtube and other forums that hardly anyone uses diagonal bracing.
    Almost every bridge you see has diagonal bracing, In my career i have been involved in ship building and modification. nothing to do with cnc but building structures.

    Just for an example using 4 pieces of box section to be welded together to create a square, how do you measure it to be sure its square? you measure the diagonals, if they are equal in both diagonals its square.

    taking the same square and adding a cross beam it can be moved to create a parallelogram, ie out of square in all corners with very little force needed for all the sides remain parallel.
    If you put one crossbeam in the diagonal from one corner to the other the square frame will remain square till something breakes, by fixing 1 diagonal the other one is automatically brased too.

    Nothing wrong with your build and I am not knowlegable enough to look for any flaws but after seeing so many I am curious as to why diagonals are not used in tables, especially the legs and even the top and gantry, with diagonals they will remain square far better than with a direct crossbrace from side to side. I can also see that diagonal bracing is sometimes impracticable too.
    Can someone of yous enlighten me as to why nobody uses them

    Derek

  5. #154
    Kitwn's Avatar
    Lives in Exmouth, Australia. Last Activity: 8 Hours Ago Has been a member for 2-3 years. Has a total post count of 474. Received thanks 64 times, giving thanks to others 11 times.
    Quote Originally Posted by Kered View Post
    Can someone of yous enlighten me as to why nobody uses them

    Derek
    You'll see some diagonals in welded steel frames but I suspect with aluminium it's the practicality as you sugest. If the profile manufacturers made the fittings for it and the builders bought the saws for it then you'd see nothing else.
    Engineering is the art of doing for ten shillings what any fool can do for a pound.
    Wellington.

  6. #155
    Any recommendations on building your electronics enclosure yourself versus buying one? I am struggling to find one that I think will be large enough for any sensible price. I want to fit everything in the sam enclose, which includes:

    (3 phase 400V mains)
    - AC line reactor
    - Mains filter
    - E550 Sunfar VFD
    - 4x Dyn4 drives
    - 1A schaffner filters for each drive
    - MB3 breakout board
    - 1 or 2 24VDC power supplys
    - Mains circuit breaker
    - Contactor for E-stop circuit
    - Relay for E-stop circuit
    - Circuit breakers for each independent phase (insteaf of regular fuses)
    - Terminals

    It starts to seem like I would nees atleast a cabinet sized 800x600x250mm. I figure welding my out of sheet metal would be cheapest.

    Skickat från min SM-A530F via Tapatalk

  7. #156
    I can assure you that 800x600 is too small :)
    This is what I have and everything is cramped inside.

    I bought mine from rs-online, price seemed reasonable.

  8. #157
    Sterob's Avatar
    Lives in Australind, Australia. Last Activity: 9 Hours Ago Has been a member for 0-1 years. Has a total post count of 68. Received thanks 4 times, giving thanks to others 4 times.
    My next build I'm going to look at using small extrusion for a enclsoure frame, then one can make it any size one wants.

  9. #158
    I dithered for ages about this, feels like they should be cheaper.

    In the end I went for a Tempa Pano EKO, which enabled me to have a glass front. From memory, the non-glass version, 800x600x300 was about £115, with glass circa £130.

    http://www.tempapano.com/en/eko/

    Is it overkill? Yeah. Is it nice? Uh-huh.

    Space wise, I think its about right... theres plenty of room left in mine, and allowed lots of space for airflow and future expansion. But, honestly, I'm not using most of the depth and its all about how you want to package it. I could probably have fitted the same components in 500x500 or less. Have a look on my log for a reminder of how full up my cabinet is, page 9 post #87 has a photo.

    Alternatively, I also looked at used server racks, which seemed like a viable option.

  10. #159
    Quote Originally Posted by NordicCnc View Post
    Any recommendations on building your electronics enclosure yourself versus buying one? I am struggling to find one that I think will be large enough for any sensible price. I want to fit everything in the sam enclose, which includes:

    (3 phase 400V mains)
    - AC line reactor
    - Mains filter
    - E550 Sunfar VFD
    - 4x Dyn4 drives
    - 1A schaffner filters for each drive
    - MB3 breakout board
    - 1 or 2 24VDC power supplys
    - Mains circuit breaker
    - Contactor for E-stop circuit
    - Relay for E-stop circuit
    - Circuit breakers for each independent phase (insteaf of regular fuses)
    - Terminals

    It starts to seem like I would nees atleast a cabinet sized 800x600x250mm. I figure welding my out of sheet metal would be cheapest.

    Skickat från min SM-A530F via Tapatalk
    Don't buy anything until you have everything electrical and lay it out on the bench. Servo drives require a lot more space than steppers for cooling purposes and just physically larger anyway. Also think about fitting fans and the Air flow when placing drives etc.

    Given that your mostly using extrusion then I'd use aluminium panels and some small extrusion and build the control box into the lower frame if possible.
    -use common sense, if you lack it, there is no software to help that.

  11. #160
    Talk about keeping us in suspenders,??? . . . . Was the pitch wrong.?
    -use common sense, if you lack it, there is no software to help that.

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