1. #1
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Hi Everyone,

    I am planning to add some adjustable machine feet to my CNC but I could do with some advise.

    My machine has four 50x3mm steel box section legs. I was thinking that I could just weld a 50x50x5mm piece of steel to the bottom of the leg and drill/tap it to accept the machine foot.

    The machine feet are m12 with a 1.75 thread so my question is would the tapped 5mm plate thick enough??

    The total weight of the cnc is about 150kg

    Cheers,

    Jim

  2. #2
    Quote Originally Posted by cncJim View Post

    The machine feet are m12 with a 1.75 thread so my question is would the tapped 5mm plate thick enough??

    The total weight of the cnc is about 150kg

    Cheers,

    Jim
    I think it would be fine as you would have 2.8 threads in the plate, also the machine foot would have a lock nut on it and therefor the weight of the machine would also rest on the nut. You could of course weld a nut onto the plate.
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 4-5 years. Has a total post count of 1,000. Received thanks 170 times, giving thanks to others 5 times.
    I made up plates and then welded nuts to them. Seems to have worked fine, and saves a bit of tapping! I set the plates into the legs a short distance so that the nut is on the "outside" but more-or-less flush with the bottom of the leg; this way it does not rely on the weld to hold the machine weight.

  4. #4
    cncJim's Avatar
    Lives in Reading, United Kingdom. Last Activity: 3 Weeks Ago Has been a member for 4-5 years. Has a total post count of 170. Received thanks 15 times, giving thanks to others 32 times.
    Quote Originally Posted by Clive S View Post
    I think it would be fine as you would have 2.8 threads in the plate, also the machine foot would have a lock nut on it and therefor the weight of the machine would also rest on the nut. You could of course weld a nut onto the plate.
    Quote Originally Posted by Neale View Post
    I made up plates and then welded nuts to them. Seems to have worked fine, and saves a bit of tapping! I set the plates into the legs a short distance so that the nut is on the "outside" but more-or-less flush with the bottom of the leg; this way it does not rely on the weld to hold the machine weight.
    Thanks guys - I hadn't even thought about the lock nut on the foot. I think I will just go for it and weld a nut on if I feel its needed.

    Cheers,
    Jim

  5. #5
    Quote Originally Posted by Neale View Post
    I made up plates and then welded nuts to them. Seems to have worked fine, and saves a bit of tapping! I set the plates into the legs a short distance so that the nut is on the "outside" but more-or-less flush with the bottom of the leg; this way it does not rely on the weld to hold the machine weight.
    I did a similar thing but mine rely on the weld to support the weight. Pic below shows the nuts tacked in, I welded on all sides of the nut in the end.

    Click image for larger version. 

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    At the moment they've got machine feet in them but ultimately will be used to secure the machine to the inclined frame...
    Neil...

    Build log...here

  6. #6
    Wouldn't mess about with tapping etc Just weld Nut on it's simple and easy.!!

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