Hi Reinoud, yeah i saw that you put up a lot of new stuff into the repository, Did you sleep at all during the weekend ? Let me just check for the corel draw and .dxf format, but i supose they want to have the drawings in either .eps or .svg format then. I'll do a new layout to suit the 30*60 cm. For the material i would just go with the one that is the easiest to glue with instant glue and tby energetic - Delta Machines
Sure. Those Drawings are for first generation opto endstops ( uses 3 to get reference for each leg). Cheers, Torstenby energetic - Delta Machines
An update to my delta design. I finished the all laser cut design. The file attached has an offset of .135 mm to compensate kerf. Are there any preferences for file formats? My laser service required .dxf for example. What are the various kerf compensations you used thus far? I could provide 2-3 standard offsets if required. Cheers, Torstenby energetic - Delta Machines
Hi Viktor, yes, exactly, i made a workaround, but this works just for having the Delta move the extruder, and if the gravity is not inversed. Cheers, Torstenby energetic - Delta Machines
Hi Lawrence, i used this part balljoint magnet Cheers, Torstenby energetic - Delta Machines
Hi Reinoud, i don't think you need an google account, but i'm not 100% sure. It should work with just your username and the password. As far as runing a stepper with the profile is concerned, i think this will not work, it will work with a servo, as absolut position is related to a fixed timeslice, but for steppers i think i need something like delta steps per timeslice ( which should not be aby energetic - Delta Machines
Hey Reinoud, you sound like an embbeded pro, so please go ahaead. Could you detail the concept a bit more? Do the values in abc column represent Axis positions in steps? Or does it represent pwm values ( positions ) for servos ? Cheers, Torstenby energetic - Delta Machines
Hey Reinoud, everything is based on the 3G makerbot firmware, lets see how big it gets in the end and maybe it also fits on to an arduino. There are quite a few important pieces missing, which i'm tinkering with at the moment( the really important pieces unfortunatelly, I am not really experienced in c-programming or embedded design, but i'm learning). Stampers and the Trossen way basically doby energetic - Delta Machines
Hi Reinoud, yes the initial plan was to have an bowden extruder in place. The magnetic joints can hold up to 3 kg per joint but with dynamic movement there is not much of an safety margin left if putting the stepper on to the moving part. now for details: gear ratio is 1:8, standard stepper with 200 steps per rev and ,5Nm holding torque, halfstepping ( initially, different drivers and i will gby energetic - Delta Machines
Hey Reinoud, thanks, i did not calculate it using Stampers formulas, i just did a few sektches in my CAD Tool to estimate the build size. I'm surprised it was that close I think it is his specialized construction, as far as his measurment errors are concerned.... Cheers, Torstenby energetic - Delta Machines
Hey Reinoud, thanks, build size should be 200 x 200 x 150, fitted into the non rectangular workspace, so if you could confrim, would be good. Parameters: radius from center endefector to tangent of ball joint axis: 40mm radius from center baseplate to tangent of ball joint axis : 40mm thigh length : 132mm tibia length : 168mm paramter choice was based on the results of Stampers Thesis for thby energetic - Delta Machines
Reinoud, please up some pics. I'm really curious to see your work. I am basing my firmware on the replicatorg protocoll , as i am not a big fan of transmitting floats via serial. floats in generall do not seem the best thing for an 8 bit Risc. But appart from the protocoll ( G-Code vs replicatrg based) the rest should be a fairly similar task. What about joining forces? see my repository aby energetic - Delta Machines
I'll try to fill some of the spaces in the wiki for this topic. But please be patient, it might take a while. Optimum tibia/thigh ratio etc. and a lot of helpfull information on deducing forward and inverse kinematics can be found in the PHD Thesis of R.E.Stamper and in general at . The hard bit now is doing all that c(#) firmware stuff. The bits and pieces are there, just putting it togetheby energetic - Delta Machines
Lawrence, i have finished the mecahnical part of a delta with NEMA 17 Steppers lately and am now trying to get the software running so i can test it. For the moment i just can attach a drawing, i have not photographed the Delta yet. It is using magnetic balls as joints together with flathead imbus screws. (Based on Vistors tripod work). The design can be simplified so that you can get rid ofby energetic - Delta Machines
Guys, try this link, pretty nice extension of the Arduino enviroment to work with an M3 Cortex Stamp. STM 32 Arduinoby energetic - RepRap Host
Yep, vieweg lists them at even higher prices than the aluminum ones i think. There is a really cheap variant with al hub and stainless tip here: aluminum hub/ stainless steel tip even if they add 1 € for purchasing them in quantities of 1-2, they are really cheap. Remains the problem with viscosity... Does MOLDLFLOW do academic versions? This would be extremely handy in terms of materialby energetic - Mechanics
Viktor, take a look at these... used for solder paste dispensing SMD solder paste dispenser needles price is really an issue, they go for something around 25€ each (vieweg). The normal alu hub stainless steel needle versions are way cheaper.by energetic - Mechanics
Cheers Everyone, v1.2 is finished, it fixes a stupid bug with the out of workspace check and adds in jacobian calculation. please feel free to test it, if you find any errors please post it. jacobian is not tested yet, unit is 1/length. length picks up the units you assumed when creating the delta function. so if you used mm then, it gives you 1/mm.by energetic - Delta Machines
Hi Bodge, your configuration is from the pictures more a falcon config, than a pure delta, which means the inverse kinematics are different too. You can get more details here: Libnifalcon Docs page there is also the reference to the PHD. Thesis by R.E. Stamper i derived my lib from. Cheers, Torstenby energetic - Delta Machines
I rearanged a bit in the lib to get an out of workspace check. the output is in radians. I am working on an extension to also have the Jacobian and forward kinematics included. Currently computing angles for one point takes around 2,5ms. For calculating the angular velocities for a given translational velocity, the Jacobian is needed, which requires a lot more use of the trigonometric functionby energetic - Delta Machines
I see, i need to registered to post files... so here we go... I organized 4 standard RC servos from my brother ( comes in handy if your brother is into RC Planes sometimes) and will try to hook them up to the sanguino. Cheers, Torstenby energetic - Delta Machines