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CUT SMITH

Discussion in 'CNC Mills/Routers' started by Weldsmith, Feb 6, 2018.

  1. Weldsmith

    Weldsmith Well-Known
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    Weldsmith published a new build:

    Read more about this build...
     
  2. stargeezer

    stargeezer Veteran
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    Awesome build Weldsmith!!!!!! Following this great build!!!!
     
  3. joe williams

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    Are your plates plasma cut 1/4" steel ?
     
  4. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    Great looking build Weldsmith, with lots of innovative features. Really like how you doubled up on the belt and pinion, I think this will go a long way in making the machine that much stronger.
    Really nice job and thanks for the share brother. Looking forward to seeing it plasma cutting. :thumbsup:
     
  5. Weldsmith

    Weldsmith Well-Known
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    Joe, I used my CNC mill to machine aluminum plates. I sand blasted them and then painted them with wrinkle paint. That is why they look like steel.

    Stargeezer and Mark, thank you for your kind comments. I believe this build will be a handy tool when finished.
     
  6. Weldsmith

    Weldsmith Well-Known
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    Joe, I just realized that I do have some steel plates down on the leveling feet. However, they were cut on my CNC Mill but, not how one might think. I have been wanting to build a gantry style cnc to cut sheet metal from the time I built my mill. Not having one, I figured out how to flame cut using the table of my milling machine. It has a 8" x 21" travel. Not bad for making brackets and what not. I will add a picture of the mill flame cutting the pieces.
     
  7. Weldsmith

    Weldsmith Well-Known
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    I could not get the torch video to upload. However, I took a picture of the apparatus so people can see how I flame cut parts with my mill. thumbnail_20180211_171618.jpg
     
    Mark Carew and Rick 2.0 like this.
  8. joe williams

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    Looking Good!
     
  9. Gooshpoo

    Gooshpoo Journeyman
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    Pretty cool project, Have you used an open electronic frame before? Im super paranoid about interferences and as a results im using multiple boxes. an open plate would be so much easier to deal with. how do you plan on midigating the emi ?
     
  10. Weldsmith

    Weldsmith Well-Known
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    My electronics will be inside a box. If you follow my build you will see exactly how the electronics will come together. I think it is a much cleaner build when the electronics are in a box it keeps dirt, water, metal etc. out of the electronics. I will post picture of that in the next couple of days. I am using a pilot arc plasma vs a High freq plasma. I believe the EMF will be less of an issue. I have read there are ways to ground the tip of the plasma. I am not sure if this works or how it was executed.
     
  11. polemidis

    polemidis Well-Known
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    if you need to make a 3D model I can help, I am designing in Freecad. Let me know :)
     
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  12. Weldsmith

    Weldsmith Well-Known
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    Polemidis, I have 3D models of the plates. I will post all my drawings here soon.
     
  13. Weldsmith

    Weldsmith Well-Known
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    I have now uploaded my excel work sheet. and The DXF file for the 2D drawing that I used for Fusion 360. In the excel file you will find parts lists, Notes, and links to Fusion files and to purchases . I hope that some one can get some use out of them. This is not my first build by any means but it is my first post on a build. I am private in nature, not that I do not want to share. Quite frankly, I probably would not have posted this and would have been content watching everyone else build there projects. However, there was a contest involved. That would help me with a portable milling machine that I have been wanting to build. A little competition will always make you feel alive!!
     
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  14. johnnycnc

    johnnycnc Well-Known
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    Great looking build, Weldsmith. I am curious if you feel that the double belt will be stronger that a lead screw? Really impressed with your innovations on this build
     
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  15. Weldsmith

    Weldsmith Well-Known
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    No, I have no illusions that it will be stronger than a properly fit lead screw. My primary purpose for this machine is for plasma cutting and occasional oxy acetylene cutting for thicker plates. I of course will push the limits and put a router on it and see what it will do. I did do a little math and the calcs shows that the working load on X axis is around 45 lbs. of force. This is obviously with deflection of the belts. It may perform OK If I keep the speeds and feeds down.

    Thank you for your kind words!
     
  16. johnnycnc

    johnnycnc Well-Known
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    I've noticed that some of the builds are using construction lumber for the table. Since I'm looking at building a 1500 x 1500 mm. unit my thoughts were that wood would move to much and that I would have to go to either welded steel or t-slot extruded aluminum? What are your thoughts?
     
  17. Weldsmith

    Weldsmith Well-Known
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    I believe you can make a wood structure very stiff. It should be cross-braced or sheathed. The type of material depends on what your resources are and what you plan on building. I would never build a wooden Plasma cutter base, but I have seen some very nice wooden router bases. In all reality the stiffness needs to be in the machine tool. The base has to be mildly substantial . Most openbuild kits are made for a bench. Also wood is cheep, steel is moderate priced and extruded aluminum is kind of expensive. Keep in mind that these bigger hobby machines take up a lot of room. I have decided to create a lot of storage under mine so I can take back some of my garage.
     
    #17 Weldsmith, Feb 20, 2018 at 7:45 PM
    Last edited: Feb 21, 2018 at 12:54 AM
  18. Giarc

    Giarc Master
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    I used this 2x4-Basics-Workbench, and made my own 2x4s by laminating 3 layers of 1/2 inch (or maybe it was 5/8"?) plywood. It seems to be nearly impossible to find dimensionally accurate and stable - not to mention 'uncrowned" - 2x4s. It works great. My base supports a heavy torsion box table top made of 1/2 inch particle board and the a 1500 x 850 CNC router. I amvery satisfied with its stability. You could make your "2x4s" whatever length you want, or if you are spanning a larger area, laminate them up to be actual 2" x 4" 2x4s (or thicker).
     
  19. Gooshpoo

    Gooshpoo Journeyman
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    check out my build there i made a table with a 3d model and price list it is sturdy like a rock and its about 200 lbs at least it feels like it haha.
     
  20. Weldsmith

    Weldsmith Well-Known
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    Gooshpoo, You are building a monster! It looks nice. Earlier you asked what I was going to do for the EMI I have outlined my plan below. I posted this in my build file as well.

    While wiring this machine I have learned a few things. If you are creating a CNC plasma, make sure you do your home work. There are many things to consider. Here is a short list of considerations. There are plenty more items out there I am sure.

    1. Purchase a Pilot arc plasma (NOT a HF plasma) there is a difference. The high frequency does cause noise issues in your electronics. the pilot arc grounds the tip to start the arc. The PWM of the inverter style units still create noise which is why you have to do all these other thing to make it write.
    2. Use a motion controller that is optically isolated. even the cheap ones come optically isolated.
    3. Run a ground rod and connect it to your table with in 20'
    4. Use foiled twisted wires with ground. (For everything.)always ground this in one spot back inside your cabinet.
    5. keep THC out of main cabinet. try to buy a unit that has an external voltage divider to keep plasma voltage away from other electronics.
    6. use a noise filter on the main power.
    7. do not run run the torch lead in with wires if you can help it. I am ignoring this one until it bites me in the butt. It is to nice and neat inside the wire track.
    I did not develop any of this. I found these items from many different sites on the Web, I just compiled them. If you have any suggestions I will add them to the build document.
     
  21. Gooshpoo

    Gooshpoo Journeyman
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    Thanks for your input on my build. you look like your on track with the EMI Thanks for the 1. That is somthing that I never knew and will take into consideration if i explore plasma cutting. and also the within 20'. Your build is looking awesome. I want to know more about this flame cutting apparatous on your mill.
     
  22. Weldsmith

    Weldsmith Well-Known
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    The flame cutting is nothing more than a piece of square tubing attached to the bed of my CNC mill bed. The only thing I would change there is the length of the tube steel. It is a little short. I program it like any other 2D part. I have to manually turn on the torch but, that is not a big deal.
     

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