1. #1
    Do u thing i nessecerly need to do a face milling of my 80x80x5mm steel tube to mount the helical rack M1.25?! If i mill it lets say 1.5mm the wall thickness will be 3.5mm which is not enough to screw the rack on the tube. I plan to weld a steel piece on the top of the tube and than face mill it and mount the rails, but i really dont know what to do with rack.The gear and the linear rail are fixed, and i can not move them and i only can play with the steel tube
    Click image for larger version. 

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ID:	17528 Looking forward for some advices.

  2. #2
    I've not used rack and pinion myself but guess the surface for the rack needs to be fairly flat. If you machine a flat section then you could always add a piece of flat bar on the inside of the box section to compensate. Go for 5-6mm thick and you will have plenty to thread into and it will give extra support
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  3. #3
    Thats what i was thinking about, that was one of my options. Thanks a lot anyway.

    Sent from my HUAWEI P6-U06 using Tapatalk

  4. #4
    I found machinist who ask for 200 Euro for face milling on steel plates for mounting rails and rack. Its kinda too much. Any cheaper but good workingClick image for larger version. 

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  5. #5
    mekanik's Avatar
    Lives in Barrow in Furness, United Kingdom. Last Activity: 23 Hours Ago Has been a member for 6-7 years. Has a total post count of 505. Received thanks 57 times, giving thanks to others 54 times.
    Quote Originally Posted by masinecc View Post
    I found machinist who ask for 200 Euro for face milling on steel plates for mounting rails and rack. Its kinda too much. Any cheaper but good workingClick image for larger version. 

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    Just a note but i think you would be better having the rack the other way round (ie flat face to top) as you have it shown the gear and rack are going to get contaminated with all sorts of crap.
    Perhaps you could fix the rack direct and adjust with spacers @ each fixing point, you could clock it in using a fixture on the support rails(gantry would be ideal)
    Regards
    Mike

  6. #6
    JAZZCNC's Avatar
    Lives in wakefield, United Kingdom. Last Activity: 12 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 5,726. Received thanks 892 times, giving thanks to others 35 times.
    You don't need a ground or even machined surface just so long as it's resoanble flat and stright.

    Mekanik is correct that you don't want the Rack facing upwards as it will soon fill with debris and you'll have allsorts of trouble. Idealy you want it facing downwards and the Pinion spring loaded into it. This way if your surface isn't perfectly flat the pinion is still fully engaged.

    Could have it on it's side but still you'll want some form of guard above to stop debris falling into the rack
    Last edited by JAZZCNC; 16-02-2016 at 06:12 PM. Reason: Deleted Edit: I was wrong

  7. #7
    I had it already fix, but havent post it here. Here how it looks now :) Click image for larger version. 

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