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  1. #61
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    That's how I do it...both drivers have the same signal source.

    Quote Originally Posted by 109jb View Post
    What you could do is run the 2 X motor drivers from the same step/dir signals.

  2. #62
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    That's great, when this actually gets built I'm sure I'll ber asking for more detailed advice. Just good to know it can be done.

  3. #63
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by dixdance View Post
    That's great, when this actually gets built I'm sure I'll ber asking for more detailed advice. Just good to know it can be done.


    It can be done, but it's not recommended. In the past Gecko advised that it can limit your speed. Better to get a BOB and software that will give you the number axes you need.

  4. #64
    Community Moderator ger21's Avatar
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Actually, that's running two motors from one drive, not two drives from one set of signals.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  5. #65

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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by Goemon View Post
    Check out these Haas aluminum Sub plates. They are all over ebay and likely to be sufficiently flat and stiff out the box:

    https://www.ebay.com/itm/Sub-Plate-H...cAAOSw5QlbLQcz
    Very Nice. Thanks for the info Goemon.

  6. #66
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Actually...my setup is simple...a lot more simple than what most of you use. My controller is an Arduino Uno which only has ports for an X, Y and Z. The two drivers for the motors that move the gantry in the Y axis get their signal from the single Y port on the Arduino. It was a setup that was on my Shapeoko 2 that I carried over to the machine I built.

    Quote Originally Posted by ger21 View Post
    Actually, that's running two motors from one drive, not two drives from one set of signals.

  7. #67
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by JFL4066 View Post
    Very Nice. Thanks for the info Goemon.
    I just wish I had all the info I have now at the start of my build. There are so many off the shelf options for used precision cnc parts if you know what to search for. I would have saved a ton a time and effort building parts that I could have bought better and cheaper.

    I passed on the chance to buy something like this for $1500. I'm still kicking myself:

    https://www.ebay.com/itm/2006-Integr...frcectupt=true

    You won't achieve precision like that making diy parts on a cheap mini mill....

  8. #68
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Well, I'll throw in my humble little project. Built this with 80/20. Made the gantry myself (on a mini mill) by drilling the mounting holes through both plates at the same time (stacked on top of each other). cheap Chinese ball screws. motor kit and controller from CNC router parts. 3HP 220v water cooled spindle. I made the bed out of wood so i could level it with the spindle. Seemed like the best way to get a level bed. Tapped all the screws by hand. This is still a new machine but I've done some diamond drag engraving in Al. the smallest letters at the bottom, in the pic are about 2mm. And making a fretboard for a guitar in hardwood. the fretslots are made using a .023" end mill and the cut was programmed to stop .07" from the ends. All 23 slots seem pretty good along the 18" of the board and the bit didn't break! These are about the most precise projects I've made so far. All in it was about $3000 CAD so maybe $2300 USD. 2' x 3' bed. Chasing zeros is great for rhetorical discussion but real world cuts on cheap machines require a different mind set. More setup time, strategic cutting with feeds and speeds (i.e. lighter), more trial and error. wasted time and material. I don't use this to make money or for production. If I did it would be a whole other machine and investment. I've already broken 2 couplers (those cheap spiral ones that came with the ball screws). It is what it is. Had a blast building it. Love running it. Learned a lot - and still learning. What else can you ask for? Do I expect .002" precision at 24"? hell no. What could you possibly be building that requires that accuracy at 2 feet - in wood??? Even with a 3hp motor, which is plently to cut Al, I wouldn't attempt to hog out a large piece like a manifold. Little parts are no problem. It's the same as a welder. You wouldn't try to weld 1/2" steel with 20% duty cycle.

  9. #69
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Hi, that's a nice project build...…...that solves the table issue that dogs a lot of builds.....very practical too.
    Ian.

  10. #70

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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by Goemon View Post
    I just wish I had all the info I have now at the start of my build. There are so many off the shelf options for used precision cnc parts if you know what to search for. I would have saved a ton a time and effort building parts that I could have bought better and cheaper.

    I passed on the chance to buy something like this for $1500. I'm still kicking myself:

    https://www.ebay.com/itm/2006-Integr...frcectupt=true

    You won't achieve precision like that making diy parts on a cheap mini mill....
    That's impressive. At first glance it looks like the base for a CMM. All granite, can't imagine what it originally cost. I would have bought it just to look at. LOL.

  11. #71
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by JFL4066 View Post
    That's impressive. At first glance it looks like the base for a CMM. All granite, can't imagine what it originally cost. I would have bought it just to look at. LOL.

    I know right. Even now, I am fighting the temptation to order several precision granite gantries I have seen. Even though I finished my build and I am happy with it...

  12. #72
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    Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Quote Originally Posted by handlewanker View Post
    Hi, that's a nice project build...…...that solves the table issue that dogs a lot of builds.....very practical too.
    Ian.
    I'm not so sure. In my experience, wood is one of the worst materials to use if precision is the goal. It bows, expands and contracts with changes in the weather. You could make it perfect today and find a dip in the center tomorrow. You'd have to go over it with a fly cutter before every job.

    That's not to say that other materials don't have limitations. Metals can also bend with variances in temperature if the table is not sufficiently stiff. This is one of the reasons why granite and epoxy granite are favored for hyper precision machines.

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