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  1. #221
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    Hi Dave,

    As Greolt has indicated - the usual route would be to use an outside offset cut for SheetCAM.

    I've cut some of the dino dxf files on this thread using SheetCAM, but a few have a single line for the slot on the pieces. I've had mixed results with these, as some contain very tiny loops of lines, and SheetCAM isn't too happy with them.

    In general, using outside offset is the best bet, but it's always worth checking the gcode output with something like CNCSimulator, or just getting your machine to cut a couple of pieces as a test.

    You can of course fix minor issues with a free CAD package like ProgeCAD, but it is time consuming.



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    Community Moderator ynneb's Avatar
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    Lets say you use a 6mm bit and the material is 10mm thick, then cutting along, or even to the outside of the line, means the slot is still too thin for the pieces to slot together.
    This is why I originally said that the first method is to use the same sized tool as the thickness of the material.
    If you changed the drawing, as I suggested in the second method, this means you can use any sized tool on any sized material, so long as the tool was thinner than the material. You then use the cut outside the line option.

    I Hope the drawing explains this.

    Qualify: I would only use the edit option if you knew you wanted to make a few of the same design, and you wanted to use a smaller tool to reduce cutting and mess and strain on the machine.
    A smaller tool is better for cutting than a bigger tool.

    Attached Thumbnails Attached Thumbnails Dinosaur skeleton, and other models, DXF files.-cutting-jpg  
    Being outside the square !!!


  3. #223
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    Hey Benny you didn't read my post very well.

    If using single line slots then cut them, before cutting out the shape, with an appropriate sized cutter "On The Line"

    Perhaps the time has come for grandpa glasses.

    Greg




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    Community Moderator ynneb's Avatar
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    Ok Greg Im past it these days. You young whipper snappers are running with the ball now.

    I guess I was thinking, One tool one job. Thats all.

    Maybe you can grind me some lenses on your machine, thanks sonny.

    Being outside the square !!!


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    Dave don't worry about our silly banter. Benny and I know one another.

    Just to try to clear up what I said.

    If using a dino file with single line slots. Use two operations.

    First cut the slots with the cutter size to match material thickness, "On the line" I would go around and cut all the slots.

    Then next cut out the shapes "Outside the line". Cutter size not so critical.

    If using dino files with the slot drawn in. Just cut "Outside the line" with a small enough cutter to fit in the slot, or smaller.

    I hope we have helped and not confused with our posts.

    Greg



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    Default Thanks

    Gentlemen,

    Banter notwithstanding, thank you for your responses. You both answered my question, each in your own unique way.

    I will be cutting a few puzzles (T-Rex and Pterodactyl) this weekend, and I will post pictures next week of my success (or failure).

    Thanks again,

    Dave



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    I hope they go well Dave.

    One other thing that is worth mentioning.

    A lot of the dino DXFs have rather sloppily drawn slots for whatever reason. Maybe they were traced.

    The slots are often drawn with tapered sides and varied widths. Just watch out for that.

    I have gone around the few that I have cut and edited the DXF to clean up the slots.

    When the slots are good the cut pieces all fit together well.

    Greg



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    Default Does anyone have a good picture of this spider?

    Quote Originally Posted by edmond View Post
    Hi Hutchy 74

    Here are a t rex and a spider in DXF format, hope this helps.I think the t rex was made for 2mm material so just scale it up until the slots suit your required material, the spider is made for 1/8" material.

    Edmond
    I have cut the spider and am having a "brain fart" on trying to get it together. The legs are easy, but the rest looks like it might need some modification.

    Ken



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    Jack....Do you have pic of the horse puzzle



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    Quote Originally Posted by jfc11 View Post
    Jack....Do you have pic of the horse puzzle
    it´s?

    Attached Thumbnails Attached Thumbnails Dinosaur skeleton, and other models, DXF files.-cavalo-jpg  


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    jack I played with your horse bit and cleaned out all the broken lines and scaled it to .375... I'm cutting it now ... heres a cleeaned up file

    thanks

    Erik

    Attached Files Attached Files


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    cut like a dream.

    Erik

    Attached Thumbnails Attached Thumbnails Dinosaur skeleton, and other models, DXF files.-dscn0603-jpg  


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    with litle mod



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    Smile

    Hi Ken

    I have not yet had a chance to cut the spider I posted, I found it on some German website.The rib pieces go into the slots along the curved section, there should be 9 ribs and 9 slots.I will post the file again but will number the parts as soon as I have cut it.My machine has being down for a while but should be able to cut it at work on our laser cutter.



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    edmond,

    Thanks for the reply ... I got most of it together. My biggest problem was that several of my slots were too short. I still have no idea where 2 identical pieces; that have no slot; fit into the spider.

    I guess a picture would be helpful ... I will try to post one tonight.

    Attached Thumbnails Attached Thumbnails Dinosaur skeleton, and other models, DXF files.-spider1-jpg   Dinosaur skeleton, and other models, DXF files.-spider2-jpg  
    Last edited by KSerdar; 03-10-2008 at 09:43 PM. Reason: Upload pics


  16. #236
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    Hi Ken

    The spider looks awesome, didn't realise it was that big.I had a good look at the file in my CAM program and also saw some of the slots are way too short for the pieces to fit snugly into.I will lengthen the slots as well as number the parts to make assembly much easier.Im also puzzled about the 2 pieces that have no slots.I plan on cutting the spider the weekend if my collet 3mm - 1/4" collet adapter arrives.



  17. #237
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    Arrow Nice Mods

    Quote Originally Posted by jack_live View Post
    with litle mod
    Looks nice & clean along sides with the mods!

    Great work.



  18. #238
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    Default Scaled the file.

    Quote Originally Posted by edmond View Post
    Hi Ken

    The spider looks awesome, didn't realise it was that big.I had a good look at the file in my CAM program and also saw some of the slots are way too short for the pieces to fit snugly into.I will lengthen the slots as well as number the parts to make assembly much easier.Im also puzzled about the 2 pieces that have no slots.I plan on cutting the spider the weekend if my collet 3mm - 1/4" collet adapter arrives.
    I used AutoCAD to scale the drawing for ~1/4" slots. I had to move pieces around alot to make it fit into my 15" x 30" work area. After I connected the legs together, I noticed that it was going to be very large. I really should 1/3 to 1/2 scale it again.



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    Default My dream "dino"

    This is my dream chopper ,6 hours of cad work

    Attached Files Attached Files
    fell free to drop by www.newtime.dk/dxf_files
    plz. don´t mind my misspelling :)


  20. #240
    Community Moderator ynneb's Avatar
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    Quote Originally Posted by Soundcop View Post
    This is my dream chopper ,6 hours of cad work
    Looks good. That will take a lot longer than 6 hours work to convert it to a skeleton cut. My head hurts just thinking about how you would do that.

    Attached Thumbnails Attached Thumbnails Dinosaur skeleton, and other models, DXF files.-chopper-jpg  
    Being outside the square !!!


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Dinosaur skeleton, and other models, DXF files.

Dinosaur skeleton, and other models, DXF files.