The more rigid a machine is, the easier and more forgiving it is to use. This topic has 1 reply, 2 voices, and was last updated 2 years, 7 months ago by . Now, there is still that little detail in copyright where if a part only has a certain shape, because it has to do a certain job, copyright just doesn’t apply to it. If the angle is on the same side of the rail there is no twist, if it is on opposite sides there is 2x’s the twist (print error). -Belts and screws can be sized for any ratio, or resolution. So if your calipers have 2 decimal places you are only really certain of the first decimal place, the second decimal place has been rounded up or down. 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. After having built with the official parts, I can highly recommend not using them and printing the modified versions instead. The flange offset puts the switch actuator on the midline of the base, not that that matters, and the base features rounded corners and a suitable legend, because I can. The LowRider CNC requires Stainless rails. ..within reason of course. The suggested max is 1 ft. But as the z axis progresses through the cut, the machine actually gets more rigid and is correcting the previously undersized cut. The current designs theoretical resolution is 0.005mm, or 0.00025 depending on your drivers, you do not need higher resolution. And I thought it would a good start and an easy fix for the belt with a new printed part that would directly clamp the belt with no zip ties. For the creative of you, you could use the dual end stop firmware for Y alignment or even Z (homing min or max). Fresh guides, reviews and projects are published every week! Project. As the table was cut to size accurately, I could use the edge as a reference. This also includes things that bolt to the XYZ and then have a higher attachment point (Extension Bracket), same effect. 49 99 3. Update 6/27/2017 I added JackScrew_Test_Rev30.stl and & JackScrewMate_Test0?mmClear_Rev30.stl. The mirrored version of other parts is for functionality, corner top and bottom. -Most people do not use endstops, I would say much higher than 90% do not. The accuracy/run out of your tool/spindle. I mean, after all, this design was CC-0 to start. in the 2nd name denotes the clearance amount for the internal threads. We’ll actually come back to that later. 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? Rough is .030″ (.762mm). I keep using this number that came out of a calc, but have never verified it. But it’s more fun to print them yourself! I use flat rate boxes and to ship any other carrier I need to buy a different box and repackage and drop it off, so please only ask if you are saving a substantial amount of money because it cost me a lot of time and effort. -I do not have any CAD files available other than a few mounts that makes it easy for anyone to edit. The kits, currently, come with 72OZ/IN steppers wired in series. Match to motor and board connector. Horizontal (or even long vertical) screws have “whip” . In either case you will need to up the power for that axis to overcome all this added mass and friction. -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. And for me, that means releasing as open-source. 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. To counter act this you need ball-screws, which are stupidly expensive and need to be adjusted. Working with a pen, I have been using 2D plots to check the MPCNC calibration. I chose protomold because you can see the actual cost, example. Now, just to be clear, I didn’t just import the original stls into Fusion, chop off the zip tie brace and add the belt slot, this part is designed from the ground up. -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. This seems to break it in, stretch the printed parts, whatever it is doing. You can mill aluminum on the Lowrider up to 4’ wide by literally as long as you want. It’s little more than a flange atop a wide base: MPCNC Tool Length Probe – Slic3r preview. 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. Alright, I got this MPCNC built, it moves, it cuts, you were able to follow the entire build process live here on YouTube. Alright, I got this MPCNC built, it moves, it cuts, you were able to follow the entire build process live here on YouTube. You will see lots of images of people attaching cable chains, wires, and vacuum hoses to the Z motor mount. With 100% certainly anything attached to your gantry that is taller than the upper xyz part will have a noticeable and detrimental effect. 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. -Stock Z axis max speed is 8.5mm/s (30mm/s for the T8, firmware limited), I usually use 3-5mm/s for routing jobs with an 8mm/s rapid. Having a tool length probe station on the Sherline, I had to build one for the MPCNC:. I anybody give it a try, let me know how it is. By telleropnul, June 5, 2019. Diminishing returns kicks in really fast in the CNC world. -The new dual endstop firmware is an advanced piece of software, please learn the basics before you try this. Last week, I was out filming a few project and when I got back, I wanted to actually tune this thing in and get it to cut well. It has nothing to do with strength. They say “In general, tolerances of ±0.005 in. This is the absolute worst place on the entire machine to attach anything! -Before you start your cut on the MPCNC, measure each roller to its closest corner block, take the same measurement on its counterpart. It will act as a torque multiplier and completely ruin your accuracy/precision., Copyright 2019 - V1 Engineering Inc - License information. This is where I keep my current MPCNC config in case I have to reflash it: Single endstops software enabled (G53 Xpos Ypos only) – Single endstops software disabled – It is now time to plot the obligatory MPCNC crown test pattern … I set up an orthotic shoe insert on the MPCNC and unleashed the Z-Axis height probe on it: Orthotic – bottom probing. I am trying to keep poorly made things from popping up everywhere. There is no added benefit to running the CNC with a larger power supply. With a rack-style gantry, you could build the machine as long as you want in the Y direction! I have no intention of harming any project that enables people to do awesome things, in fact, I want the MPCNC to be as awesome as possible, which is why I started making modified parts in first place. 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). 42 57 10. -Some parts could be better or stronger with added hardware, or the use of support when printing, this is not my design intent. MPCNC Tool Length Probe – plotter pen. You can use a spring driven anti backlash but that adds a large amount of friction. Motor wire (etc) extension. -Lubricant. Now, obviously, I don’t think this part counts as a derivative design from the original MPCNC, but what Ryan kept pointing out is that he basically considers any part a derivative of the original as long as it fits onto the other parts because the dimensions and positions of features are the same as the original. In round numbers, the difference is under 0.3 mm along each rail. And yeah, I did build this one slightly larger than they normally are, but what I was noticing was that the belt and the way the belt was mounted introduced a lot of flex into the drive system. You don’t need anything for corrections because by that point your cut is already ruined. Screws have backlash, a lot of it, and every single time it gets used the backlash gets larger. M=Mirrored parts- Some printers can’t do low overhang angles well or don’t print well in general, so there is a mirrored version of the rollers.The mirrored version is to prevent the gantry from twisting with cruddy prints. Physically go measure, it will save a lot of headaches in the end. Once you start your cut they are locked in place. This machine uses less “table touching” that the previous version, because we simply did not need it. -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. This gives you a larger acceptable feeds and speeds window. Most people already have one and they do work, I understand this, but don’t expect stellar results, it is a good option to get your feet wet with a minimal initial expense if you already own one. If you continue to use this site we will assume that you are happy with it. – Wood can change size by up to 4% seasonally due to humidity (1m = up to  40mm change), so be mindful of what you expect out of wood. The Z direction (height) is best kept to a 3-4″ maximum for wood, with that being said, you can make the usable z length as much as you want you will be working from the bottom up, so go to town. The outer numbers on the lower sketch show the difference between each reading and the lowest value along that axis: the left rear corner is (roughly) 0.5 mm higher than the right front. 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. MPCNC part 4. The two easiest ways right now are an off the shelf plug, or the control module in the shop (that can be used with or without PID control). 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. The ? The whole project from starting to print the parts to an operational machine was about two weeks. 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. 3D printers are all basically a repeat job, meaning your bed is always in the same place. Make sure the z axis is still parallel, and rebuild the center by taking out the 7 longest bolts then put it back together. Braided PET (nylon) sleeve diameter is measured as flattended sleeve, not the circumference and comes in widths of 3,6,10,12,20,25,50 mm. After a few hours use, take the gantry out or at least take off the belts. I have some 36-inch rails (~24-inch working area) on my laster-cutter MPCNC that are just aluminum, but are 1.00" diameter with 0.120" walls (with the 25.4mm MPCNC parts) and it's quite rigid. You start your machine square, simply by starting it on the hard stop belt blocks. And here’s where it got complicated. Size – All axis can be any length you prefer, anything over 3 1/2′ (1M) would require small mid-span supports to increase rigidity, of course smaller is better. If you can’t get them set well enough see the next FAQ. MPCNC Calculators… LowRider, Zen. Physically larger spindles move the cutter further from the gantry decreasing the rigidity. -Using your business account is a possibility but really it is a hassle for me. Hose Channel¶ I use 1.5″-2″ aluminum angle with a few Velcro straps to keep the hose and cords contained. The calipers you use are only accurate to 1 decimal place less than they display. -We use either steel EMT conduit (sold by ID), or stainless steel tubes (sold by OD. The accuracy/run out of your cutting bit and are you using the right kind. 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. UPDATE 31/12/2015 Added a US version for 23.5 conduit This is a first release of my Universal Mount for the great Mostly Printed CNC. MPCNC - Universal Bracket for Long conduit . -The DeWalt is by far the best bang for your buck where available, but I am not positive it is the best choice if money were not an option. Ryan. Whose design even is this? This is the area your tool can reach. -A more powerful spindle isn’t always better. Viewing 2 posts - 1 through 2 (of 2 total) Author. saying “I want 23’s for strength”, means nothing. So, just to be clear, I started out by wanted to release my design with no restrictions for everyone to use, for the MPCNC community and for whoever wants to make the part, there’s also an awesome community supporting this channel, so whenever I spend my time and design something, I want it to be available for as many people as possible. I found out after testing one of these scaled-up parts, that 100% scaling is fine. Anything over 3′ or so and you should really have a look at the LowRider CNC. Building the MPCNC: Parts and component choices! Second, is the Z or vertical axis perpendicular to the work table. Dual endstops can do this for you with the cost being more CAM planning. Screws and belts have backlash, belts have very very extremely small amount most of us can’t measure it. I chose 20mm wide braided sleeve. -How big to cut your rails? Checking the tension on the middle bearings by rolling it with your finger can reveal a lot about unequal tension. Find additional material and full transcripts to the content on YouTube here. 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. But then please do respect that license and don’t use my original work commercially, either, including in derivatives. But it wasn’t that easy.