1. #1
    RobC's Avatar
    Lives in manchester, United Kingdom. Last Activity: 09-09-2018 Has been a member for 1-2 years. Has a total post count of 36. Received thanks 8 times, giving thanks to others 4 times.
    So I've given up trying to make my current first build accurate and it's just not feasible (ZeeflyBoy has inspired me to build a better one). I didn't think of the old 'if you cant make it perfect make it adjustable' when I was building it and so now I've been trying to add in adjustable features which sort of work but I'm still way out on the z-axis. With this next build I'll be ditching the rather heavy 80mm steel box and going with Ali extrusion. This is the section which I've got least experience with. I'd like to make this a question.

    1) Which extrusion size would be applicable best for a roughly 1000mmx500mm which will only be cutting wood and aluminium, I won't be factoring in steel machining to this. The end pieces will be 20mm aluminium plate bolted right into the extrusion core. Also to add the gantry span would also be extrusion, what would be a good size to work with 20mm hiwin rails.

    2) So far I've gauged I'd like a double such as 4080 such as here
    http://www.aluminium-profile.co.uk/a...KJN993130.html

    3) -I'll be using 20mm Hiwin rails
    - 20mm ballscrews

    I'm yet to fully piece a design together as I'd like to get the critical structure understood prior to that. I'm in the UK and would only like to order from the EU or the UK so no China (Customs love my address).

    And here is an image of my current setup, I've had such bad luck and became depressed with the issues and never went further with my great plans of wiring in all the sensors, such as temperatures and max/min travel with lovely steampunk style gauges to let me know the values on a machined panel. I will have to move the lathe, again
    Click image for larger version. 

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    Last edited by RobC; 04-06-2018 at 10:37 PM.

  2. #2
    2) So far I've gauged I'd like a double such as 4080 such as here
    http://www.aluminium-profile.co.uk/a...KJN993130.html
    Rob 90x45 would work better if using BK bearings supports as the hole spacing is 46mm and would fit nicely into the T slots.

    20mm screws might be a bit overkill but others may differ
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    RobC's Avatar
    Lives in manchester, United Kingdom. Last Activity: 09-09-2018 Has been a member for 1-2 years. Has a total post count of 36. Received thanks 8 times, giving thanks to others 4 times.
    Hi Clive, I'll be pretty much dismantling the bearing supports and hoping to have the bearings push fit into the end sections of the aluminium plate If all goes well. I'm not too sure if that would then change your decision on what size extrusion but silly me meant 16mm screws as I'll be re-using my current ones and plenty spares. Cannot wait to get away from the terrible sbr stuff, had a nightmare of a job chasing ball bearings around the place. I'll be going for two on the X, one on each side section and one on the Y.

  4. #4
    Quote Originally Posted by RobC View Post
    Hi Clive, I'll be pretty much dismantling the bearing supports and hoping to have the bearings push fit into the end sections of the aluminium plate If all goes well. I'm not too sure if that would then change your decision on what size extrusion but silly me meant 16mm screws as I'll be re-using my current ones and plenty spares. Cannot wait to get away from the terrible sbr stuff, had a nightmare of a job chasing ball bearings around the place. I'll be going for two on the X, one on each side section and one on the Y.
    Ok Rob It would be a good idea to get something in cad. Not sure what you mean by "push fit into end sections" as you will at least need a bit of wiggle room
    ..Clive
    The more you know, The better you know, How little you know

  5. #5
    RobC's Avatar
    Lives in manchester, United Kingdom. Last Activity: 09-09-2018 Has been a member for 1-2 years. Has a total post count of 36. Received thanks 8 times, giving thanks to others 4 times.
    That's the reason for me asking on here regarding extrusion size as I need to know that before I proceed onto the whole drawing up in fusion. An image here to show what I mean by push in on the ends. http://i.imgur.com/yajSuNI.jpg

  6. #6
    Hi RobC

    I don't think you need to mill pockets in the end-plates for your router frame. See my build here. Just use sturdy section extrusion (I used 80x40 heavy gauge 4kg/m ) with extra aluminum strips under the supported round rail. It is plenty rigid enough when bolted up with M8 screws into the ends of the extrusion. Like others have said do a CAD drawing so you can be clear in your thinking and express clearly to others what you are trying to achieve. A picture always tells a thousand words....

    Regard
    Michael

  7. #7
    RobC's Avatar
    Lives in manchester, United Kingdom. Last Activity: 09-09-2018 Has been a member for 1-2 years. Has a total post count of 36. Received thanks 8 times, giving thanks to others 4 times.
    Hello Michael, I'm still trying to decide really as the extrusion from mcmastercarr in fusion360 is not the dimensions it says it is as its 0.200mm out and it's messing up my designs so I think I'll have to order the extrusion and then measure it to check then go off that figure in cad.

    It's not too different from my current build what you built, just slightly different gantry design.

    Rob

  8. #8
    Quote Originally Posted by RobC View Post
    Hello Michael, I'm still trying to decide really as the extrusion from mcmastercarr in fusion360 is not the dimensions it says it is as its 0.200mm out and it's messing up my designs so I think I'll have to order the extrusion and then measure it to check then go off that figure in cad.

    It's not too different from my current build what you built, just slightly different gantry design.

    Rob
    Rob
    I would use a British extrusion drawing (or metric) as it might be different than from the USA

    try here https://www.motedis.co.uk/shop/Slot-...91_999994.html
    ..Clive
    The more you know, The better you know, How little you know

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