I chose 20mm wide braided sleeve. This is where I keep my current MPCNC config in case I have to reflash it: Single endstops software enabled (G53 Xpos Ypos only) – Marlin_software_endstops_enabled+G54fix.zip Single endstops software disabled – Marlin_software_endstops_disabled.zip It is now time to plot the obligatory MPCNC crown test pattern … All screws need lubricant, very bad in a dirty environment. If you can’t get them set well enough see the next FAQ. MPCNC Size Calculator¶ Sizing¶ When choosing what size to make your machine, start with the build area. -Most people do not use endstops, I would say much higher than 90% do not. -0.065″ stainless is fine, or thicker, if the nut traps will need to be modified to fit in your tubes or you can print custom ones. The LowRider CNC requires Stainless rails. -You can print 1 to 1, measure, view DXF’s with this free SolidWorks tool. Having a tool length probe station on the Sherline, I had to build one for the MPCNC:. I’m certain that all things considered, I did nothing wrong, but I’m going to respect the fact that Ryan doesn’t want this. The kit comes with enough belt for up to 48″ of total outer X and Y axis dimensions (eg 24″x24″, 36″x12″ or any other combination). While I was already drawing a new part, I wanted to go ahead and work on a few other challenges that I ran into during the build, like the fact that there are only a handful size options available for tubing, none of which are really as cheaply available here as metal conduit is in the US, the fact that almost none of the nut traps were grabbing the lock nuts properly and I’d had to jam a screwdriver in there to hold them, and a few of the parts only seem to be made for imperial-sized hardware from the start, not metric. Worked great, so I tweeted about it, was like, hey I created this part, if anyone wants to use it, here’s the Fusion360 design, I’m sharing this as Creative Commons 0 aka public domain, print it, modify it, include it in your project, you don’t even have to give credit for it, basically, do whatever you want with it. As much as people will have you believe otherwise aluminum isn’t that hard to mill, you can mill aluminum on an MPCNC at most any size. Aluminum with an 1/8″ bit requires a 1.5kg load, so worse case on a directly X axis cut you would have a force of 1.5kg pushing sideways….nothing. Screws and belts have backlash, belts have very very extremely small amount most of us can’t measure it. 3D printers are all basically a repeat job, meaning your bed is always in the same place. I 3D printed the first 10 layers of the MPCNC foot object to use as a template for drawing the screw holes in the table. Maximum Size. -Maximum length for the z axis on the MPCNC- about 12″ using a bowden style setup with the extruder mounted to the xyz piece of the gantry, 8″ max for an mk style extruder, 3″ for an aluminum router. -Some parts could be better or stronger with added hardware, or the use of support when printing, this is not my design intent. If you can replicate the parts from scratch you can probably make an informed edit and understand how the pieces interact and how to keep them printable as well. -A more powerful spindle isn’t always better. That’s why, for example, your car’s brake discs aren’t protected by copyright from Ford or someone, because the shape they have is not “design” in the artsy way, it’s purely function, and copyright only applies to “art” and creative work in the widest sense. by kwebersole Jan 12, 2017 . They are more than double the price, I kind of doubt they are twice as good. Use the measure tool to make sure you printed it correctly sized. This gives you a larger acceptable feeds and speeds window. I love user designed things, and I support them as much as I can. For the project I printed the official parts from V1 Engineering, but I’ve since learned that there are substitute community versions available that make metric hardware much more usable. PeRL (Printed engraving Rotary Laser) by TommasoEngineering Jul 5, 2019 . New Home › Forum › Mostly Printed CNC – MPCNC › Advice – MPCNC › Maximum Size. -Maximum length for the z axis on the MPCNC- about 12″ using a bowden style setup with the extruder mounted to the xyz piece of the gantry, 8″ max for an mk style extruder, 3″ for an aluminum router. Width (X direction on rails) should always be the shorter axis and is recommended to keep the work area no larger than 4′ on this axis. ..within reason of course. As the build goes on, this page will get updated! Now if we follow that line of thought, Ryan owns the copyright to this area, I own the copyright to that, and in the end, nobody gets to use it. But it looks like, for the time being, the MPCNC is going to be Ryan’s project alone, with him wanting control over the entire thing. Like, what? A non-commercial license isn’t considered open-source because it comes with so many restrictions in how you can use a design, for example for educational use, in a makerspace that, yes, usually has member fees, or in any other context where someone is making money with it. The bottom & top flex corners I uploaded are .4mm clearance, so try the test prints 1st which should take considerably less time to print to make sure this design will work for you. I keep using this number that came out of a calc, but have never verified it. Working with a pen, I have been using 2D plots to check the MPCNC calibration. But then please do respect that license and don’t use my original work commercially, either, including in derivatives. Because Ryan of V1 Engineering, he designed the the original MPCNC parts, came in and was like, “Hey Tom, you can’t actually release these parts as public domain, they’re a derivative work of my original parts, so you need to release them as Creative Commons Attribution Non-commercial.”. From there, why would it every turn? -Whip. I’m sure I’ll find a new home for the spindle, electronics and all that. Yup, it works, the shorter the better. Screws have backlash, a lot of it, and every single time it gets used the backlash gets larger. In a CNC router your bed is now your work piece, and your work piece is located where your fasten it down. Z– (toolmount) 120mm min. The more rigid a machine is, the easier and more forgiving it is to use. MPCNC - Universal Bracket for Long conduit . The MPCNC has been designed for something roughly the physical size and weight of the Dewalt dw660. – There is a much smaller load on the machine that you think. You should be able to tweak these by hand to get all axis equal to its counterpart at the same time before you start your cut. Now, extrapolate that a little and you can see the flaw, with a tall Z axis you can get a wonky cut (under sized) as the leverage comes into play, but is still should not wander. After having built with the official parts, I can highly recommend not using them and printing the modified versions instead. If you measure something at 10.53mm it is 10.53mm+/-.01mm so .02mm accuracy for digital calipers (for really good ones, not the $10 HF ones). Match to motor and board connector. It happened in the first few months of the release. As the table was cut to size accurately, I could use the edge as a reference. I used a laser range finder to measure distance and square the frame. In either case you will need to up the power for that axis to overcome all this added mass and friction. Dual endstops can do this for you with the cost being more CAM planning. This seems to break it in, stretch the printed parts, whatever it is doing. Minimum printer size required to print the MPCNC parts- X&Y – (XYZ turned) 135mmx135mm on a Cartesian, 160mm Diameter on a delta, min. –Please do not attach anything to the Z axis assembly above the tool mount. Also, I started by scaling all the parts to 102%, so that after the ABS shrinks, we should get the exact right size. in the 2nd name denotes the clearance amount for the internal threads. So what followed on Twitter was two days of discussion between Ryan and me of what is a derivative design and what is not, who holds copyright to what and what the morally right thing to do was. -In almost every page you will notice no talk of endstops and the forum is full of why not and when to use them. A MPCNC can be built large enough to handle a 510x750mm (20”x30”) sheet of foam board, but it won’t be stiff enough to mill aluminum. With a rack-style gantry, you could build the machine as long as you want in the Y direction! The wheels are pointed in the exact same direction and the steppers are moving at the exact same time. YouTube; Smaller machines are more rigid. So I started in Fusion 360, created a new parametric design and drew up the first part, one of these corner pieces with adjustable wall thickness, screw size, rod diameter, and, of course, it has the belt just pushed in sideways with no zip ties or anything. -Good international options are kress, and the import 400-800W spindles. This machine uses less “table touching” that the previous version, because we simply did not need it. This ensure your machine works correctly and you are familiar with the basics of CAM and how your machine moves. -Steel or stainless steel only, aluminum will not work for long (high point loads from the bearings will wear in a flat spot making it a loose fit) and it is about 3 times less rigid. Update 6/27/2017 I added JackScrew_Test_Rev30.stl and & JackScrewMate_Test0?mmClear_Rev30.stl. MRRF 2020 was set to be the unveiling of the new MPCNC revisions that I have been working on for a long time. MPCNC part 4. MPCNC Marlin config. To counteract this you have to support them at both and and have a diameter large enough it does not sag and whip, expensive, very very expensive. -Gcode control of your AC powered spindle is possible. Wood is drastically less. These will be driven by stepper motors, and I'm looking to use a tracking technique with gt2 belts. This means people who are making new parts should be making pretty high quality parts, no one wants to have to try several versions to figure out what actually works, right? You can go even bigger if you keep this in mind and use mid span support on the outer rails to supplement the rigidity. You can find the parts I used listed below, as well as the build videos and livestreams. In round numbers, the difference is under 0.3 mm along each rail. The max depth you can mill aluminum is the usable depth of your endmill, or you can flip it over and double that. 0.049″ wall thickness seems to be the sweet spot Q&D test) on the MPCNC. We’re building a MPCNC! Bigger or smaller works depending on the hose size you use. Once you start your cut they are locked in place. You will see lots of images of people attaching cable chains, wires, and vacuum hoses to the Z motor mount. Checking the tension on the middle bearings by rolling it with your finger can reveal a lot about unequal tension. 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