1. Hello,
    I'm starting the gantry build, i assume the 2 beams must be bolted one with the other, and i ve think that could be done with a t nut and a (minimum diameter) hole for the hex key, screws will be M8 Din 7380. The gantry is about 1m, 1 tnut every 10cm x 2 rows. the 2 beams could be positionned differently...

    or is there any reason to not make holes (stifness...) and do that differently ?

    thanks for your comments.

    Click image for larger version. 

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  2. #2
    Hi Pierre

    This is exactly what I did on my build (see my build here post #10) . My Gantry is 700mm wide so I think I spaced them at between 120 - 150 mm apart, drilled through the profile so I could tighten the bolts. I was using much heavier material than you are (4 kg/m) and only 80 x 40 profile. The L shape inspired by Jazz gives great resistance to torsion. What type of spindle will you be using? The spindle I have weighs over 2kg hence the use of the heavy gauge profile to resist torsion. I have some concerns about the thickness of the material you are using for your gantry if you have a heavy spindle plus the weight of your Z axis ballscrew, bearings and stepper/servo motor?

    Kind Regards
    Michael

  3. Quote Originally Posted by MikeyC38 View Post
    Hi Pierre

    This is exactly what I did on my build (see my build here post #10) . My Gantry is 700mm wide so I think I spaced them at between 120 - 150 mm apart, drilled through the profile so I could tighten the bolts. I was using much heavier material than you are (4 kg/m) and only 80 x 40 profile. The L shape inspired by Jazz gives great resistance to torsion. What type of spindle will you be using? The spindle I have weighs over 2kg hence the use of the heavy gauge profile to resist torsion. I have some concerns about the thickness of the material you are using for your gantry if you have a heavy spindle plus the weight of your Z axis ballscrew, bearings and stepper/servo motor?

    Kind Regards
    Michael
    thanks !
    80x120 profile
    15mm ground aluminium and 20mm alum plate
    2.2kw chinese spindle water cooled
    i would buy the 3nm from zap or cnc4you if i had to rebuy instead of 4nm from cnc4you.

    my log here
    http://www.mycncuk.com/threads/8717-...c?goto=newpost

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