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  1. #31
    Hi Jonathan

    I am beginning to see where your coming from. I have taken on board previous comment about the over hang over the x rails. At the moment their 700mm but I could reduce this to 600. I am going in on monday to see what box is available.I thought about 80 x 40 with the rails top and bottom.

    Bruce
    The more I know, I know, I know the less. (John Owen)

  2. #32
    Quote Originally Posted by motoxy View Post
    I thought about 80 x 40 with the rails top and bottom.
    80x40x3 box section is less than a third as torsionally stiff as an 80x80x3 box section. Same reason as before - material is distributed further from the centroid with a square compared to a rectangle.

    These photos show mine (old pictures!) with the size I mentioned. I put 20mm thick plate in the ends of the box section to make as strong joint.

    Click image for larger version. 

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  3. #33
    emmm. okay. I have looked on line and 3" x 3" x 10 swg (3.2mm) is easily available. My limitation is no access to a mill. All my work is bench work. But I am sure I can come up with something.
    I feel I have come a long way since i started reading the site where someone was building a plywood cnc on his kitchen table. I have t admit that I am glad to be getting so much advice that does make sense.....so far

    BTW I have made an offer on the spindle. See if he bites???

    Jonathan may I ask what you are studying at uni?

    Bruce

    closing off see you all tomorrow some time.
    The more I know, I know, I know the less. (John Owen)

  4. #34
    See your mum was right? there was reason why she said to eat up your weetabix in the morning:whistling:
    If the nagging gets really bad......Get a bigger shed:naughty:

  5. #35
    Quote Originally Posted by motoxy View Post
    Jonathan may I ask what you are studying at uni?
    Electrical engineering.

    Quote Originally Posted by 2e0poz View Post
    See your mum was right? there was reason why she said to eat up your weetabix in the morning:whistling:
    Er, who was that aimed at - I don't follow?

  6. #36
    Cereal packet - Weetabix........Bruce
    If the nagging gets really bad......Get a bigger shed:naughty:

  7. #37
    Dear mum, bless her
    The more I know, I know, I know the less. (John Owen)

  8. #38
    Just ordered my spindle and inverter. Made an offer of 140 instead of 172 and it was accepted:dance: Other than postage that makes it the same price as a Kress. Bargain.

    Now off to redesign the gantry.
    Bruce
    The more I know, I know, I know the less. (John Owen)

  9. #39
    Yup
    Here is the item no. 190618666009

    There are more to be had

    Bruce
    The more I know, I know, I know the less. (John Owen)

  10. #40
    OK Here is a thought on redesigning the gantry. Any similarity to Jonathan's machine is purely down to plagerism. I have looked at a construction that I can do myself. I will make some enquiries tomorrow about acccess to a m/c shop.
    Click image for larger version. 

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    The more I know, I know, I know the less. (John Owen)

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