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  1. #11
    Hi guys, ive done some work redoing the design as per the suggestions. The lower frame will be made from 50mm square steal box with 3mm wall. The total z axis travel is 120mm. Ive not drawn the bed yet but it will sit in the space at the bottom of the frame but also be adjustable upwards .

    Ive still got some things to draw like the z axis screw and stepper ect and x axis stepper mounts.



    Trev

  2. You need some diagonal bracing on the base. How are you going to ensure the rails are on the same plane? There doesn't seem to be any adjustability in there.

  3. #13
    JAZZCNC's Avatar
    Lives in wakefield, United Kingdom. Last Activity: 11 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 5-6 years. Has a total post count of 5,722. Received thanks 892 times, giving thanks to others 35 times.
    Quote Originally Posted by irving2008 View Post
    How are you going to ensure the rails are on the same plane? There doesn't seem to be any adjustability in there.
    He can shim the Profile between the box section. This will work well and be easy enough to get on same plane with careful setup.

    Trev. Design looks ok but I'd build the frame differant regards how section is arranged.? Make the the legs extend down to the floor this will make the welding easier and give more support to the uprights. See pic knocked up to show what mean.
    Click image for larger version. 

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  5. #14
    Thanks for the replies. My dads got the lower frame priced up built from a company who does work at his company. They gave the choice of carbon steal or aluminium in 50x50x3mm. I will see if i can have the design tweeked. I know they will do a first rate job as they do all sorts of precision work.

    Ive just been working through the costs, to see if im in the right ball park. Do these seem right so far or does anyone know where i could get items for a better cost?



    Hiwin 20 Rails 4x (off cut of two will build z axis) 155.15 http://www.aliexpress.com/item/750mm...832489900.html
    Hiwin 20 Bearing blocks 12x 222.42 http://www.aliexpress.com/item/1PC-E...048643961.html
    Gantry Profile 72.02 http://www.metallin.co.uk/
    ball screws 250
    spindle 183 http://www.ebay.co.uk/itm/2-2KW-WATE...item3f0a793189
    steppers
    drivers
    controller
    aluminium


    Thanks again

    Trev

  6. #15
    JAZZCNC's Avatar
    Lives in wakefield, United Kingdom. Last Activity: 11 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 5-6 years. Has a total post count of 5,722. Received thanks 892 times, giving thanks to others 35 times.
    Try these for profile they are cheap and quick delivery despite being in Germany. I buy my profile here and they are very good with accurate cutting.
    http://www.motedis.co.uk/shop/Slot-p...91_999993.html

    Tip with the gantry profile if you use Bosch rexroth BR type profile 90 x 45 then the BK/BF12 bearing holes match the slots. With Item 8 series type they don't and you'll need to make plates for mounting. I Make machines that use L shape arrangement with 90x45 and they are more than strong enough so don't worrie about using shorter widths.

  7. #16
    Quote Originally Posted by Gotty101 View Post
    Thanks for the replies. My dads got the lower frame priced up built from a company who does work at his company. They gave the choice of carbon steal or aluminium in 50x50x3mm. I will see if i can have the design tweeked.
    I think you will find mild steel is sufficient for the frame and will be much cheaper than aluminium, also the extra weight will be a benefit when the machine is working.
    Last edited by EddyCurrent; 09-11-2014 at 11:42 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  8. #17
    JAZZCNC's Avatar
    Lives in wakefield, United Kingdom. Last Activity: 11 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 5-6 years. Has a total post count of 5,722. Received thanks 892 times, giving thanks to others 35 times.
    Quote Originally Posted by EddyCurrent View Post
    I think you will find mild steel is sufficient for the frame and will be much cheaper than aluminium, also the extra weight will be a benefit when the machine is working.
    Agree with Eddy and aluminium tends to crack around welds from vibration over time so wouldn't use it for the frame. I weld aluminium often and wouldn't build the frame from it unless weight was critical and even then I'd use much thicker aluminium than I would steel.

  9. #18
    thanks for the replies guys.

    With regards to the HGH20CA blocks ive found some at a great price but the spec is HGH20CAZOC Very light preload. Or should i go for Z1?
    Ive had a look around and this thread said z0 (
    http://www.mycncuk.com/threads/3711-Hiwin-linear-blocks-HGW-20-CC-what-preload-to-spec)

    Thanks again.

    Trev

  10. #19
    JAZZCNC's Avatar
    Lives in wakefield, United Kingdom. Last Activity: 11 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 5-6 years. Has a total post count of 5,722. Received thanks 892 times, giving thanks to others 35 times.
    Stick with Z0 don't need higher preload than this. The HGH20CAZOC are normal grade bearings and will be fine.

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  12. #20
    Hi guys, just an update to say ive not given up. Ive order the Hiwin blocks, and found a source for the rails, screws (1610 and 1605 for the z)

    This is where im at, ive not had chance to redraw the lower frame or the cnc bed yet but thats next.



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