work with what you got build


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  1. #1
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    Default work with what you got build

    Here is a photo of my franken build. i got a good deal on 15' of 4" .25 square tube and this happened. i had 3 2' lengths and didn't want to cut them so I just gave my self plenty of Z. The I beam with it's sporty orange paint was $15 bucks and sitting on the 4/5/6 blocks it is within .1mm almost by accident. I'm a bit concerned about how easy the I beam twists. I'd like to weld the ends closed but I'm concerned it will move a lot. I am also considering padding it out from the steel with some aluminum to provide some dampening. The Y gantry beam is 2.5" x .25" squre aluminum. I actually tried to mill in the steel but it bowed about 3/32 due to the stress freed in the cut. I likely could have kept it straight by just skimming the very outer surface but I tried to have a registration shelf for the HG20 rail. The Y plate and Z slide was designed before I had the 4" square tube. I have a 400mm ball screw that I may swap the 300mm ball screw out for to give a bit more total spindle movement. I want to be able easily accommodate a vice.


    work with what you got build-20180821_213446-jpg


    Need to figure out what to do for the X table. I has been an adventure so far.

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    Attached Thumbnails Attached Thumbnails work with what you got build-20180821_213446-jpg  


  2. #2
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    Default Re: work with what you got build

    I can see that you are a tinkerer and builder for building sake, like me.

    If I am wrong, please explain your purpose for building and your expected finished product and usage.

    Don



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    Default Re: work with what you got build

    I hope it will be able to do aluminum accurately (no clue how fast), PCB milling, and wood. No clue what it will look like when it is done but I have all 3 axis moving now and need to adjust the Z height down a few inches. I have it square to about .1mm. X is ~600mm travel, Y is ~ 900, Z is only ~ 200 right now. The close I get the work to the Y fixed gantry the more rigid it should be.

    I'm thinking about some bracing to shore up the I beam in a trapezoid configuration that uses the bottom 4" tube to counter twisting. I'm going to get the electronicals hooked up after I lower the X axis.

    My motor is a small 500w brushless ER16 spindle and I need a better mount for it. Anyone have suggestions for good threads on spindle mounts that be easily trammed?



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    Default Re: work with what you got build

    I was able to get the X working. I have a temporary bed which is .25" steel plate and fairly flat.

    how do you rotate images in this forum?

    work with what you got build-20180822_203252-jpg

    Attached Thumbnails Attached Thumbnails work with what you got build-20180822_203252-jpg  


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    Default Re: work with what you got build

    Rotate the images in your computer before you send them to cnczone.

    Don



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    Default Re: work with what you got build



    crappy motor mount but all axis are ready for electronicals.



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    Default Re: work with what you got build

    Awesome! Will follow your build thread for sure.



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    Default Re: work with what you got build

    Looks pretty heavy , are your motors strong enough ?



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    Default Re: work with what you got build

    it is working at around 75mm/s/s (right units for grbl?) accel and 2500mm/m. X can go a lot faster but the X is much lighter than the Y/Z carriage which is about 40-50lbs. I'm running DRV8825's at around 2A. Motors can do 4A and I have some TB6600 clones I plan to test out. First cuts were square with axis and a bit not square on diagonals. I tried to use an indicator to calibrate the steps per rotation and got a decent amount of variance. Could be the indicator it is new and I have not used it much. Need to check with a dial test indicator. No visible steps on edges and no chatter from the spindle yet. I"m doubling the speed and doing another run to see how far I can push a little 4mm straight flute cutter in MDF making some drawer sides.



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    Default Re: work with what you got build

    Well I learned that it takes about 2 minutes to run DRV8825's without cooling > 2A before they hit thermal shutdown!

    The machine easily cut 1750mm/m with 2.5mm DOC with 4mm 2 flute (straight) in 9-11 ply .7" plywood. cuts came out very clean.

    Drawers are ready for assembly and I may make a few more so I plan to keep pushing the little spindle on the next batch.





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    Default Re: work with what you got build

    I like what and how you are doing it.
    To avoid overheating, turn down the amps (if you can) or switch to the TB6600 drivers.



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    Default Re: work with what you got build

    i had a wire stuck in my fan. I have a little 12v squirrel cage fan running on +5v and running silent (which is why i didn't notice it was stuck). Keeps the drivers under 35C mostly.


    I made a part for my manual milling machine today. Some success and some failure. I'll post a video. I think my spindle bearings may be crapping out or I may need a bigger spindle for this machine.



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