Sorry guys... I tracked the error. sorted. Got to work on a move buffer next...by grael - Developers
Hi all, I've been making some good progress recently after a long hibernation of a project I started about 5 years ago to design an ARM STM32F103 3D printer controller but I'm stuck at the moment, My X Y and Extrude processing seems to work just fine but after I get an M106 command from Cura and respond with "ok\n" I don't think Cura is sending me the next line with a Z move i.e: line below endiby grael - Developers
Most of the commercial boards use stepper motor controllers. A lot of them have microstepping control inputs, possibly your microstepping hard wired control inputs to the chips have a PCB fault ? i.e. 1/16 instead of 1/32 on one of your boards ?by grael - Firmware - experimental, borrowed, and future
Parrot sent me a bag of red and yellow PLA bearings and a few nylon ones as well. They all look pretty good! Meanwhile I'd made myself some bootstrap PLA bearings as solid cylinders. Much better print resolution, but I'm getting less height in the centre of my bed, I think because my bootstrap bearings are very slightly undersized in outside diameter. I'll be swapping over to parrot's bearings tby grael - New Zealand RepRap User Group
Looks interesting, Have you seen this though ? I like the quick release/lock. As for the hot end, I've made my own, bronze bar turned down for glass fibre wrapped nichrome wire, M6 inside thread, a small hole coaxial with the M6 thread for a 100k ntc thermistor and a brass bolt machined to a pointed end, 2mm drilled + the very end drilled to .4mm. this butts on to a SS M6 threaded rod with abouby grael - New Zealand RepRap User Group
41southrap Wrote: ------------------------------------------------------- > Slow progress due to a number of things - not the > least of which is electronics "issues". I finally > powered up the ramps board the other day and I'm > now fighting with limit switches being wrong in > some way and an X carriage motor that just sits > there and hums no matter what I do with the > cby grael - New Zealand RepRap User Group
ex-parrot Wrote: ------------------------------------------------------- > I felt inspired last night and got the i3 back > together. Going to have a go at that bushing set > now. I sent you a PM. Did you see the forum is showing you as having one previous post, and no historical information like the rest of us for your two higher posts??by grael - New Zealand RepRap User Group
Dust Wrote: ------------------------------------------------------- > Grael > > talk about cross talk.. > > your quote from maker bot website is about thermal > insulation > "ptfe-versus-peek-thermal-insulating-barrier" > Your other quote from reprap is about the material > itself > > So the first one isnt related to printed bushes at > all. PLA does not sby grael - New Zealand RepRap User Group
I have some spare boards from my initial batch of ARM controlled circuitboards if any of your students are real DIY wizards and want to do their own experiments, otherwise a possibility is dx.com, they sell full kits for about $775 USD. One of the nicest models in my opinion is the Cerberus Pup though. Elegant in the simplicity of it's design.by grael - New Zealand RepRap User Group
Dust and Waitaki: makerbot website: "PEEK is more rigid and won’t bow out and leak everywhere with ABS. It would be better for PLA except that PLA likes to stick to everything. So PTFE (being not sticky) is preferable for PLA. ABS is very slippery by comparison so PEEK is more than adequate for it." REPRAP site: "ABS is good because it is easier to buy and requires less force to extrude than PLby grael - New Zealand RepRap User Group
ex-parrot Wrote: ------------------------------------------------------- > I'd be happy to have a go at the nylon, but my > printer's out of comission for probably the next > week or so. How urgently do you need it? A week or two probably won't make much difference actually, I have a bresenhem's line implemendation working through the delta arms, even one for circles. At the moment thouby grael - New Zealand RepRap User Group
Hi all, I'm working on firmware for my delta printer but I currently have linear (ball type) bearings running on 7.95mm diameter SS rod and there's too much slop, I'm not even considering printing anything serious until either changing the rods or preferably, the bearings. Can anyone local print me a set of these and I can pay for the plastic and printing ? (In ABS or another slippery plastic buby grael - New Zealand RepRap User Group
I think it attaches if I tick for my signature... Only recently back in this forum. My board is completely custom, I designed it myself. Here's my sys_tick code: (uStep64 is a 64 byte top half sinewave table.) void SysTickHandler(void) { //toggle the Piezo pin: if (pzoState==1) { pzoCounter=(pzoCounter+1)%pzoPeriod; if (pzoCounter==1) { GPby grael - New Zealand RepRap User Group
CPS Wrote: ------------------------------------------------------- > Ideas much appreciated (Very very rough write-up) > > Phase 1: Design of hardware+software > > Extruder-Hot End Stick with one heater, one thermister, one nozzle diameter, it works. > Extruder-Cold End Bowden tubes aligned for converging entry into low volume hot end. > Modifications to Extruder Carriageby grael - Developers
I think to get it to work at a good speed, you'd need motors with less steps per revolution than the common 3D printer steppers which seem to mostly be 200 steps per mm. Perhaps the 7.2 degrees per step ones if you can find them...by grael - Developers
nophead Wrote: ------------------------------------------------------- > Open loop PWM is only accurate when the motor is > moving slowly. You need to measure the coil > currents like chopper drivers do to get accurate > microstepping during motion when the generated > BEMF and inductive BEMF have a large effect. Good point but I noticed that at least one of the currently used firby grael - Developers
Liquid Wrote: ------------------------------------------------------- > If Im reading this correctly, the treadmill type > off addon will definately happen. For one reason > or another. > > The sad part? > > Makerbot holds the patent... > > Idea was discussed here orginally: > > Adrian Bowyer - Continuous belt > production > Not sure how patents work iby grael - Developers
Cost is actually pretty similar. Mosfet highly integrated stepper devices such as the Allegro chips give a tidier PCB solution using less real estate, but I've already solved the "all the effort to make an L298N do what we want" issue It's nice to be able to choose the degree of microstepping myself ! As for the age of the thread... Not nearly as old as the 4 year old Arm circuit board I'm onlyby grael - New Zealand RepRap User Group
I agree. I have an STM32F103 (Arm Cortex-M3) based board I built for 3D printing and it's pretty fast already. STM do a Cortex M4 that would do everything my one is, even faster and with time spare for other things. The chips in common use in the popular 3D printer PCBs these days already do much of the work my cortex chip is doing, I only needed a fast chip because I'm directly controlling theby grael - Developers
I agree with some of the above, but you most certainly CAN do microstepping with them. It needs some different hardware though.... like my design that runs sine wave PWM via a 64 byt look up table to generate the top half of a sine wave. The drawback is that you need a fast microcontroller to schedule all the look up table entries, correlate them to the correct enable pin, synchronise them with tby grael - New Zealand RepRap User Group
I got a 40watt cartridge heater from hobbyking but I haven't tried it yet. It's 6mm diameter x 30.26mm long which concerns me, it's a lot of heating area to keep away from the plastic in my delta arm head("effector").by grael - New Zealand RepRap User Group
I've got some linear (ball) bearings on my delta at the moment and they are the noisest part of the machine by far. Go plastic!by grael - New Zealand RepRap User Group
Good to see lots more activity in the NZ region since I last checked in about 4 years ago. I have my own design of controller circuitboard based around an ST Microelectronics ARM-M3 processor. I let the project lie for around 4 years after developing the circuitboard but I'm back now. My original design used M6 threads on the horizontal axis but it proved too slow once I got some proper stepperby grael - New Zealand RepRap User Group
casainho Wrote: > I think that we should go with cheap and powerfull > (than actual AVR Arduino) ARM Cortex M3. NXP LPC > have a few ones, ST also. Xduino is a Arduino > using ARM Cortex from ST :-) > Cost is often a function of volume. There are many STM ARM cortex-M3 variants, with varying pricing. Personally, I don't consider this chip to be expensive, however, it remains to bby grael - RepRap Host
I've been busy with other things for some months, and just noted the Kartik M. Gada Humanitarian Innovation Prize. Odds of winning it, split betwwen No of teams entering... whether professionals tweak their own products to grab it etc. Naturally it occurs to me that my efforts could be a start for any other people wishing to be part of a team. So, there's a bit more incentive for everybody inby grael - RepRap Host
BodgeIt Wrote: ------------------------------------------------------- > @ Grael.. > > Now I thought my 15A drive brush less motor was > High current.. > > The size of the wire required for 70-80A would be > significant. > It seems these ratings are a little like music > power v Watts RMS specifications. > > I have two ECS modules and two brush less motors &gby grael - Controllers
I wrote a cross assembler on an amstrad CPC664 many years ago, to program 68HC11 via my custom serial port, in assembler. I've done very large programs in assembler, and certainly C is less longwinded in comparison with assembler. Most of it is going fine for me, but I've not yet got ambitious on pointers. I'm also unsure how C handles 32 bit variables behind the scenes on an ARM, I think I'll haby grael - RepRap Host
Having already started my own custom STM32 CortexM3 board earlier this year, I have some experience in it already. I'm not using any arduino clone. The cortex M3 does have a multi channel memory management unit, very handy for tasks like ethernet, serial and memory card. I'm finding the STM build environment pretty nasty to work with, but the chip is great. Partly, I'm new to C on this project,by grael - RepRap Host
Actually, I was thinking of asking for some volunteers to port it to the ENIAC platformby grael - New Zealand RepRap User Group
thanks AKA47, I'm getting more used to C, but still caught out by a few things. right now, I have a bug that I think will be to do with a resister/s that I haven't declared as volatile.... I suspect it's an ST library routine that I made work out of context, but it will take some testing to establish. Otherwise, it's going well again, the power of the ARM processor is making a lot of tasks quitby grael - Controllers