DIY Stencil Cutting Drag Knife Solution - Update 4! - Page 2

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Thread: DIY Stencil Cutting Drag Knife Solution - Update 4!

  1. #13
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    Quote Originally Posted by crob09 View Post
    Maybe the blade is small enough so it doesn't need to move with the profile? Or do I need to set something up in Mach3? I use stepper motors if that matters at all.
    Nothing special is required in Mach3 to use a swivel knife as a tool. In the CAM software I define the machining method used on the object oulline using an "Engraving" MOP.

    airnocker
    Everything depends on everything else


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    Sorry but what what is an "Engraving MOP" or "MOP" in either case?
    Also can you help me with Mach3 setup and direct me where to go?
    Thanks for the help!
    Quote Originally Posted by airnocker View Post
    Nothing special is required in Mach3 to use a swivel knife as a tool. In the CAM software I define the machining method used on the object oulline using an "Engraving" MOP.


    Website [url]http://whatisacnc.com[/url]


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    So the drag on the knife makes the blade swivel! I like that, but the 90 deg angle part has me a little concerned, how evident is it in material say 1/4" thick ?
    I still want to try this because .... well... It just kicks but all the way! This would be Good for making a design for a shirt or something.
    Quote Originally Posted by airnocker View Post
    The diameter of the blade post is very small. This makes the offset between the cutting tip of the blade and the center of blade pivot rather negligible for objects of about an inch higher or taller. For small objects, half-inch high or so, then corner rounding becomes more apparent.

    Since the blade is trapped by the upper and lower bearings, and because the tip of the blade is tiny, the blade swivels in response to direction change just like a caster wheel does on a computer chair.

    This post should answer this question and the one that followed.


    Website [url]http://whatisacnc.com[/url]


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    [QUOTE=crob09;1344352]So the drag on the knife makes the blade swivel! I like that, but the 90 deg angle part has me a little concerned, how evident is it in material say 1/4" thick ?
    I still want to try this because .... well... It just kicks but all the way! This would be Good for making a design for a shirt or something.[......what is an "Engraving MOP" or "MOP"? /QUOTE]

    Drag knife cutting is only meant to be used on very thin materials such as adhesive backed mylar or vinyl. You would never cut material more than .008-.010" thick.
    Did you view my article with photos on the BuildYourOwnTools Forum link provided in my CNC Forum post?

    An MOP is a CNC term that stands for "Machining Operation"..

    What kind of Mach3 setup are you referring to? Do you not have an operational CNC machine?

    airnocker
    Everything depends on everything else


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    Thanks for the information, I didn't know that drag cutting was only for thin material, but it's still worth looking at and very interesting. I have a number of operational cnc's just wondering how I cut with a blade is all. I did check your link like many people do I'm sure, however I'm still here asking questions.
    Are you insinuating that I stop looking into this?

    [QUOTE=airnocker;1344354]
    Quote Originally Posted by crob09 View Post
    So the drag on the knife makes the blade swivel! I like that, but the 90 deg angle part has me a little concerned, how evident is it in material say 1/4" thick ?
    I still want to try this because .... well... It just kicks but all the way! This would be Good for making a design for a shirt or something.[......what is an "Engraving MOP" or "MOP"? /QUOTE]

    Drag knife cutting is only meant to be used on very thin materials such as adhesive backed mylar or vinyl. You would never cut material more than .008-.010" thick.
    Did you view my article with photos on the BuildYourOwnTools Forum link provided in my CNC Forum post?

    An MOP is a CNC term that stands for "Machining Operation"..

    What kind of Mach3 setup are you referring to? Do you not have an operational CNC machine?


    Website [url]http://whatisacnc.com[/url]


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    [QUOTE=crob09;1344378]Thanks for the information, I didn't know that drag cutting was only for thin material, but it's still worth looking at and very interesting. I have a number of operational cnc's just wondering how I cut with a blade is all. I did check your link like many people do I'm sure, however I'm still here asking questions.
    Are you insinuating that I stop looking into this?

    So sorry for my late reply, but recent flooding in my area cut fiber cables that bring my cable Internet service to me. I've had no Internet since Friday until today.

    Will be happy to try and answer any questions you have. Just think of drag knife as a v-cutter tool doing engraving at very shallow depths of cut. Since the drag knife is spring loaded you have to find the right amount of down pressure (spring load) to cut through the adhesive material but not the backing, or in the case of no adhesive backing, just through the material thickness and not into the backing surface or spoil board.

    Like other CNC "cuts" one has to try different settings in order to find the "sweet spot".

    You can buy replacement blades for Stika or Crickett machines on-line for around $20 US, This includes the spring-loaded blade holder, bearings, magnet,etc. but they have to be converted to be mounted on a CNC machine. You would have to come up with your own way of adapting it to work with your CNC machine.

    I bought one just to see how it might work but I really liked mine better.

    airnocker
    Everything depends on everything else


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    Airnocker ?, you must fly Champs?
    Just thought I would post this to encourage anyone who is unsure if it works.
    Thanks for posting your plans for the cutter, but I must disagree with you on one point! Your design works better than you realize! It's not limited to .010" material. I built mine as soon as you posted the plans and it has worked perfectly ever since. I often cut .040 sandblast resist mask with it, even with cursive letters down to 1/4" high with no real problem. I do have to run the program 3 times to get through, but that's ok. I use it to make stencils to sand carve glass. One mod I made to your design was instead of using a spring to set the pressure, I use weights, installed on a pin that extends up. This lets me just drop on a specific weight that I have found works for whatever material I am cutting. The other advantage is that an uneven table surface is not a concern, with small springs, spring rate may not be constant if the table slopes, with weights that's not a concern. I use my machine for many different types of cnc work, so setup has to be quick. I can just through an old piece of countertop on my table, tape the material to it and cut.



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    Hi planebuilder,

    So there is an apparent aviation connection for you as well. RC? RV's?

    you must fly Champs?
    Yes, hundreds of hours in the L-16, 7AC's and Sedan. I love the Champ, in particular the 85 hp variety. I love taildraggers.

    Thanks for your feedback. I'm glad to hear that my design is far more capable and I think the weight-on-pin idea for cutting pressure is genius. This is a great tip.

    airnocker
    Everything depends on everything else


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    Default Re: DIY Stencil Cutting Drag Knife Solution - Update 4!

    There is on Bbay a drag knife holder and carbide blades (30,45,60 degree)for sell, typically for for Graphtec, and Roland Vinyl cutters. Look up CB09 holders and go from there.

    Hope this will help someone.



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    Default Re: DIY Stencil Cutting Drag Knife Solution - Update 4!

    it should work with aspire make your tool path for engraving with a diamond drag bit this will allow you to set pressure of course i haven't done this so you will have to trial and error and just save the post processor as you normally do for mach3 and turn off spindle



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DIY Stencil Cutting Drag Knife Solution - Update 4!

DIY Stencil Cutting Drag Knife Solution - Update 4!

DIY Stencil Cutting Drag Knife Solution - Update 4!