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Cartesian XYZ machines with frames made of extruded aluminum, T-Slot, Makerslide, and more. See http://reprap.org/wiki/Category:Aluminum. Previously named "Extruded Aluminum"
Re: Worm Drive Grounded Delta Printer - 12 years ago
13.1 Hot end heat management: Place a heat shield in the form of a large aluminum washer between the hot end and the PEEK. This would act as a heat shield, and heat sink which should radiate some of the heat away. I would also try to add a piece of cork between the washer and PEEK. 13.2 Hot end design modification: You could also minimize the contact surface area of the bearings by fluting thby A2 - Delta Machines
Re: Please help for getting proper firmware for this - 12 years ago
DexTARby A2 - Polar Machines, SCARA, Robot Arms
Re: Filament air pockets - 12 years ago
Post the name of the suppliers so we can avoid purchasing from them.by A2 - General
Re: LISA Simpson - 12 years ago
PVC tubes looks good, they probably need to be glued in order to hold them. Even scrap 2X4's would workby A2 - Delta Machines
Re: LISA Simpson - 12 years ago
I reviewed a few kinematic terms on wikipedia, and it left me wondering what came first the chicken or the egg What one do you begin with? Inverse kinematics Forward kinematics Kinematics chain Kinematics pair Quaternions (this looks like fun) Is there software that can generate the code for this? Solidus Labs code looks fairly straight forward to me. But not having a fundamental backgroundby A2 - Delta Machines
Re: LISA Simpson - 12 years ago
I don't have the knowledge to implement a kinematics mod to the softwareby A2 - Delta Machines
Re: LISA Simpson - 12 years ago
Quotenicholas.seward The inverse kinematics on this are pretty close to the kinematics for the Rostock. However, the carriage rotation in coupled with its translation so you will have to do one trig calculation for each arm to adjust for that. That should be no biggie for an fast ARM processor. I would like to start buying the components to build LISA this Monday! But I gather there is no softwaby A2 - Delta Machines
Re: What version of RAMPS supports microstepping? - 12 years ago
Firstly I don't have any experience with any of the 3D printer controllers. In the late 1980's I worked a little with flashing EEPROM's, but I have since forgot what I have learned. I used to program a Siemens controller, it was controlling linear actuators, and machine controls (lots of ladder diagrams). I have a loose generalized expectations, and I'm in the process of learning what options areby A2 - RAMPS Electronics
Re: LISA Simpson - 12 years ago
Offset, and tangential to the hub. This to me looks equivalent to the arms coming straight off of the threaded rod to the hub. A2by A2 - Delta Machines
Re: LISA Simpson - 12 years ago
Idea: To gain an extra 25 mm, locate the forearms tangential to the hub.by A2 - Delta Machines
Re: LISA Simpson - 12 years ago
Looks good, robust, and simple to envision building! What are you calling a hub, and what do you mean by side stepping the threaded rod? Are you going to create the code mods? I wonder if it's time for RepRap to create a separate forum for kinematic code development. A2by A2 - Delta Machines
What version of RAMPS supports microstepping? - 12 years ago
What version of RAMPS supports microstepping? Ramps 1.4 does also not support microstepping control over firmware. A2by A2 - RAMPS Electronics
Re: Pro's and Con's of Delta printers? - 12 years ago
He uses a worm drive delta printer: 450mm ear to ear! (18 inches) It was printed with my own printer - the RappiDelta (www.rappidelta.com) using PLA. I used just about a full reel of filament so it weighs close to a kilogram. It is printed at 0.3mm layer height with 6 perimeters. It is not perfect by any stretch of the imagination as some of the overhangs really needed support at this scby A2 - Delta Machines
Re: RepRap Manual - 12 years ago
FREE access to select content from Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs by Dr. Joshua M. Pearce This guide details the development of the free and open-source hardware revolution and provides you with step-by-step instructions on building your own laboratory hardware. In the first two chapters displayed here, the author defines the basic terms of open-sourby A2 - General
Re: Closed-loop stepper controller progress - 12 years ago
Idea: How about using the encoder for auto bed leveling? A simple cantilever type of configuration might be all that is needed. A2by A2 - General
Re: Mark all post/folders as read?? - 12 years ago
This would be a great option to have, the ability to mark all forums as read. I didn't realize after joining that many of the forums were active. This is due to the fact that I had not viewed each and every forum. I thought up until this week that not many people were using this site. After I went through each forum and marked them as read did I see that the site reprap was very active. A globaby A2 - Administration, Announcements, Policy
Re: Worm Drive Grounded Delta Printer - 12 years ago
@ Guizmo You are correct in pointing out the inconsistency of the terms used to describe the components that make up a WORM DRIVE. The terms that we should be using are WORM and WORM WHEEL. The assembly is called WORM DRIVE. The screw looking part is called the WORM. The gear looking part is called the WORM WHEEL. List of gear nomenclature Worm drive: A worm drive is a gear arrangement in whby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
QuoteSolidus Labs 11. The play is caused by the horizontal pivots. I am thinking of using a spring between the first arm and the base to keep the play forced in one direction 11. In addition to the torsion spring: What is the fit of the bolt to the 608 bearing like? Is the play caused by a poor fit up between the bolt, and bearing, or is the bearing loose in the pocket? If the assembly is notby A2 - Delta Machines
Re: Closed-loop stepper controller progress - 12 years ago
QuoteLoboCNC ...But without any load on the Y axis, it's really easy to have the Y axis motor jitter back & forth across the backlash, creating a lot of vibration. You need a pretty sophisticated control algorithm and a pretty good dynamic model to handle this type of situation. Springs on all the joints! I will design out the backlash. QuoteLoboCNC ...the actual accuracy is only spec'edby A2 - General
Re: Worm Drive Grounded Delta Printer - 12 years ago
Trimmer line, comes in various sizes, I don't know if there is a standard. I think it's cheaper than the 3D printer filament. I imagine that there is a lot of filler in it. 2.4 mm diameter 1.7 mm diameterby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
Yea! It's great to see the filament feeder mounted on top of the extruder! This gives some indication of it's abilities. I see you have the new brackets installed! How are they working out? If your running low on filament: 1. Go to the hardware store and purchase some Nylon weed eater filament. Put it into the oven at 160F for a few hours to drive out the moisture. 2. In addition, I read thatby A2 - Delta Machines
Re: Closed-loop stepper controller progress - 12 years ago
QuoteLoboCNC Closing a servo loop around backlash in a mechanism is actually quite difficult - especially when your axes are constantly changing direction at high speed. Can you define what "high speed" is? Then maybe we can operate under a known threshold to control backlash. CMM (coordinate measuring machine) In addition I'm also very much interested in a building a CMM. I used to operateby A2 - General
Re: Small Injection Molding Unit - 12 years ago
I imagine that the patent is getting close to expiring. Any idea where I might be able to view the patent? Shinco Sellbic Co. LTD. Desktop hot melt application "3D cell" September '95 release A2by A2 - Plastic Extruder Working Group
Re: Ultra cheap ghetto HDPE extruder - 12 years ago
Can you provide a picture or a video of a HDPE 3D printed part? Has UHMWPE been printed? I haven't seen an example of this.by A2 - Plastic Extruder Working Group
Re: Sextupteron - 12 years ago
Singularity Avoidance using Mechanisms of Variable Geometry How to stop the end effector from shaking, after stopping. Published on Nov 23, 2012 Jens Kotlarski Classical robots consist of a serial kinematic structure. As a result every actuator has to move each of its following links and joints in addition to the working load. Therefore, these machines quickly reach a performance limit when sby A2 - Delta Machines
Re: Worm Drive Grounded Delta Printer - 12 years ago
Here is the link that you requested: Backlash prevention in parallel robots Backlash in actuators is prevented by careful design of preloaded passive joints in the form of preloaded flexures or hinges with torsional springs. Comments/Questions: 11. I like the simplicity of the torsional springs to remove backlash. It will take away some of the force from the stepper motors, increase the tby A2 - Delta Machines
Re: Grounded Experimental Delta Printer - 12 years ago
QuoteSolidus Labs 1. It's a 90 tooth worm wheel. 2. Since the output of the code is in degrees, the steps per unit in the config are translated into steps per degrees. So 200*8*90/360= 400 steps per degree. 3. I will work on making a video; I have noticed that the rigidity changes depending on its position. 4. The l1 and l2 arm lengths are set in the config. They are handled in the formulas so itby A2 - Delta Machines
Re: Smartrap project - 12 years ago
Clever design! Post pics, and videos of it running. A2by A2 - General New Machines Topics