Grind the ridge/step out. Use a silicon carbide grinding bit with a spire shaped tip. You will need to find one with an extra long shaft. Or hammer into small pieces a grinding wheel, toss it into the hole, add oil, and use a brass dowel to grind the ridge/step down. The shape of the brass rod end dictates the form that you will be grinding into the barrel. Starting point: The length of the orby A2 - General
@ setherith Are you saying that Autodesk Inventor Fusion can alter a .STL file?by A2 - Mendel90
I was thinking of alternative ideas to control the mirror, and the idea of a spherical motor came to mind Then I found this video: Spherical Induction Motor (tentative) BallIP-PSR / new Ball Drive using Partially Sliding Roller / IROS2010 experiment of spherical motor.mpg experiment of spherical motor Same person controlling a laser with a gyro: Gyroscope @ tag16c Latex/TPE/TPUby A2 - Polar Machines, SCARA, Robot Arms
Idea: Hard chrome plate the drill rod. Ask a plater what they recommend. I don't know how well it would hold up. Walk into a mold or tool and die shop, and ask them if you can look at their steel supply catalogs. I've worked with CAN molders, they can get every thing. A2by A2 - General
@ Spelljammer Are you depicting a voice coil servo, or something entirely different? If you are, then maybe you don't need the rubber band, as you can control the position of the coil? A speaker uses the foam ring around the speaker cone to center the coil and hold it in position, maybe some thing like that can be incorporated? Two Axis Voice Coil Motor Stage Hard drive voice coil A2by A2 - Polar Machines, SCARA, Robot Arms
@mux Did you take picturesby A2 - Plastic Extruder Working Group
The heat traveling up the copper leads can be a safety issue. Just an idea (if this is an issue for you): I think if you added a short segment of SS wire, then the copper leads, you might be able to reduce the heat migrating up the copper leads? I was using something that was magnitudes larger than what you have, and I didn't have any problems with heat migrating up the copper leads. Why spinby A2 - Developers
Is the dog leg only for build envelope clearance? Would coming off the center line of rotation further simply the math, or even solve the nonlinear problem, or partially solve it? What material is the build table made of? A2by A2 - Delta Machines
I like your design concept, as you can inexpensively replace the resistance wire, it's light weight, less vitamins, compact, good job! It's encouraging to learn that you were able to retract the filament without it binding/sticking within the barrel. Is the ID micropolished or is it a rough surface from the drilling operation? I've worked with ribbon NiCr resistance heaters and the tag ends werby A2 - Developers
Don't use ANY plastic for food handling/storage unless you have a material certification from the vendor/supplier.by A2 - General
Providing that the alignment of the worm screw is set properly, and there are no burrs, and the worm wheel is printed with Nylon, it could last a life time of printing. For an example, an automatic garage door uses a Nylon gear, that is about 3 inches in diameter, and it lifts >100 lbs doors for many years.by A2 - Delta Machines
Good job!, and darn some one beat me to it I know I'm not the first to have that idea, and I believe it was mentioned in the forum as well. I'm curious if they solved the non linear issue 100% mechanically, with software, or is it still an open issue?by A2 - Delta Machines
greenman100 "I measured 150-200psi melt pressure when I was designing the Filastruder"by A2 - Let's design something! (I've got an idea ...)
Another option is to modify a delta robot. Take a look at the Simpson printer. Anchor the arms in one plane, and move the table up and down. You can optimize the arms movement for the largest print area. Video: Wiki: Grounded Experimental Delta Printer New arm design for Simpson style printer.by A2 - General
Looks like a hiccup 35 seconds into the video? Why would the print head move diagonally across the part? Simple vase so I don't think it was changing geometry. I imagine the same issue would be in the Simpson slicer? In this video you mention that the slicer was modified for Wally: Has this been corrected or am I seeing things? A2by A2 - Polar Machines, SCARA, Robot Arms
I'm guessing that you are probably going to need about 150 to 200 psi to push ABS through an 1.75 mm orifice.by A2 - Let's design something! (I've got an idea ...)
Don't try that, it's extremely dangerous. WHEN it breaks, the air will send shrapnel and hot molten plastic flying in all directions. You will experience debilitating pain! You will be deformed, plastic surgery will be required. Search images for "burn surgery" to get an idea for what can happen to your skin. In a laboratory environment, I have pressure tested devices with high air pressureby A2 - Let's design something! (I've got an idea ...)
Another one: Quadrupteron Cool Video: US patent: 6,729,202 University:by A2 - Delta Machines
@see3d I have unfounded concerns scaling up Wally with longer overhanging arms. I think you will create a singularity (wobble, sway)? Can you envision 1 meter long arms working? “What is your idea of the ideal print envelope for a general purpose desktop 3D printer?” Look at the print envelope of the professional machines for guidance (i.e. companies that have stock). Stratasys smallestby A2 - Polar Machines, SCARA, Robot Arms
Another guitar string tuner on Thingiverse Makerlele_MK1_plusby A2 - Delta Machines
I was envisioning adding 2 more steppers at the shoulder joint, that's in addition to the 2 steppers that you have driving the elbows. DexTAR steppers are located at the shoulder joint, your steppers are also presently located at the shoulder joints. For example: you would have Walleys steppers mounted directly on top of another stepper motor at the shoulder joint. The top metal plate would be rby A2 - Polar Machines, SCARA, Robot Arms
Parallel manipulator US patent: 20080295637 CA patent: 2633395 Take a look at claim 1. Video: A2by A2 - Delta Machines
Modify Wally to take advantage of a larger print envelope like DexTAR. You will attract more sales. Less they are patenting the device? I prefer that the larger print envelope to be the initial release on KickStarter! Video: Paper: The controller is an old PC running MathWorks' xPC Target and with a Quanser's Q8 card. The controller was programmed in Simulink. The control law is Computby A2 - Polar Machines, SCARA, Robot Arms
@Guizmo nicholas.seward said: "I designed it so that the spring puts 3.5+lbf of tension into the string at that point." ~3.5 lb tension, I think a 3d printed guitar string tuner should work, less creep over time. Material choice is always important, and if a component fails it can be replaced with a more robust one. A2by A2 - Delta Machines
I've welded a fair amount of polypropylene by hand, and I don't think it's suited for 3d printing, but I could be wrong? PP has a watery attribute, which makes it difficult to stay in one place. I image that the glass transition temperature is not suited for 3d printing, but I have not studied this. I did find some vendors selling PP. I searched for an image of a 3d filament printed part but nby A2 - General
Vitamin reduction idea: To reduce the part count, integrate the main body of the 3d printed geared tuner into the arm. This also eliminates a vendor, and associated S&H, and it's some thing that can be 3d printed! You said that mounting the spring and tensioner onto the shoulder arm solves the non-linear problem, is that still an option? Or am I not understanding some thing ? It seemsby A2 - Delta Machines
Use white plastic, if it turns brown, or black specks show up in your print you have degraded the plastic. Post cad drawings if you have them. What diameter is the wire? What is the Kanthal part number?by A2 - Developers
I don't use .stl files, searched ("how do i modify a stl file") and found this: FreeCAD can convert STL parts to solids. FreeCAD and In OpenSCAD you can import an STL file then manipulate that file with Boolean operations or movements. With Blender you can import it then manipulate the vertices individually. and SolidWorks and Inventorby A2 - Delta Machines