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http://reprap.org/wiki/CoreXY
Re: Looking for small bore flexible air hose for print cooling - 9 months ago
Quoteleadinglights I am hoping to pick the minds of somebody on this forum who may know where to get small diameter reinforced flexible tubing. What I need is something with a bore of about 2mm which is able to deliver air at a pressure of about 10 bar (1.0MPa, 145psi) while being both flexible and lightweight. The need for this is to deliver air for "near field" part cooling immediately after tby rq3 - Tech-Talk
Re: TAP-XXX Nozzle Contact Sensor - 9 months ago
Quoteleadinglights PM with address sent. I agree about automation having unpleasant surprises for the unwary. My own favorite aircraft was a Piper J3 "VP-YEM" without so much as a starter - the only electrics were the mag switches Mike Got it. I'm shipping tomorrow (Tuesday) via USPS international priority mail (I think). Customs will be declared as zero value electronics samples. I'm sendingby rq3 - Tech-Talk
Re: TAP-XXX Nozzle Contact Sensor - 9 months ago
Quoteleadinglights A nice demonstration, but for my peace of mind that it is truly consistent, can you try the following. Get a map of the surface using at least a 5 by 5 grid and save the readings. Move the sensor to two other positions fairly far from, and not symmetrically the same as the first position Repeat the mapping of the surface for each new position. Compare the grids, subtracting eby rq3 - Tech-Talk
Re: Extruder Temperature Sensors - 9 months ago
QuoteVDX ... when I was at university at end-80, we sometimes used gold-O-rings for UHV assemblies for GSI and Cern ... but as they were pretty expensive, whe had to "track" them constantly and return with "same weight", when dismantling the assemblies eventually From this time I have only a bunch of Aluminium O-rings for random use ... but, years later, got some 99.999 gold-cylinders (each 2gby rq3 - Tech-Talk
TAP-XXX Nozzle Contact Sensor - 9 months ago
While I wait for my diamond nozzle, I realized that I had never posted a video of the TAP-XXX piezo nozzle contact sensor. I've been using it regularly for months, and just recently realized a very cheap and quick improvement involving "O" rings. Gerber, STL, and DOCX files are available if anyone is interested. So here it is:by rq3 - Tech-Talk
Re: Extruder Temperature Sensors - 9 months ago
Quoteleadinglights I did not realize that platinum RTD sensors were available at low cost and in small sizes. The last time I used a PT100 sensor it was fiercely expensive, quite bulky and needed a dedicated amplifier. For the time being I will stay with my thermocouples for the reasons stated earlier but hope to find a project where I can use a PT1000 sensor. In passing though, to go with yourby rq3 - Tech-Talk
Re: Extruder Temperature Sensors - 9 months ago
I've decided to go with this: Costs about $1, should last forever, good to 600C, and directly interfaces to the existing ADC pin.by rq3 - Tech-Talk
Re: Extruder Temperature Sensors - 9 months ago
QuoteVDX ... for high-temp measuring and temp-controlling I were using PT100 and NI200 sensors with high resolution 24Bit AD-controllers (AduC847) -- for testing and adjusting I've combined two PT100 "back to back" and heated (and measured) of up to 800°C with them (they were max-rated for 650°C) Beside the common "flat" type there are cylindrical 2mm-types in a ceramic housing (could be aluminby rq3 - Tech-Talk
Extruder Temperature Sensors - 9 months ago
I designed and manufactured my pure silver heater block with the idea of mounting the temperature sensor, in the form of a ring lug device, under an Inconel Belleville washer between the nozzle and the sensor. Methods of establishing the correct crush of the Belleville washer are not germane to this discussion ;-) My design requirements are 500-600C maximum temperature, and interface with existiby rq3 - Tech-Talk
Machining Pure Silver - 9 months ago
After wandering into my local car repair garage, and convincing them to fire up their oxy-acetylene torch to melt pure silver grain into my home-made molds, I chucked the results in my lathe to roughly face them off. I'd heard all kinds of horror stories about machining silver, but it was very well behaved. Nice clean curling chip using a fine grain carbide tool, zero top rake, no coolant, a bitby rq3 - Tech-Talk
Re: racial supremacy is allowed in reprap.org 2.0 - 9 months ago
QuoteVDX ... I think, this has gone wide enough - I have not other solution against this ongoing "flame-war", than ban the user "ayozek" ... but will leave his threads visible for a time being (all the threads are in my backups, even with all the 100+ edits of them, which he did to "solidify" his stand). It's sad, how such a situation could start and thats not possible to clear it in a sound wayby rq3 - Administration, Announcements, Policy
Re: Silver Heat Block - 9 months ago
Quoteleadinglights The figures I get for volumetric heat capacity are from and I get J/g.K g/cm3 J/cm3.K Aluminium 0.900 2.7 2.4300 Silver 0.233 10.5 2.4465 Copper 0.386 8.9 3.4354 The thermal conductivity of Aluminium alloys is significantly worse than pure Aluminium, but compared wiby rq3 - Tech-Talk
Re: Silver Heat Block - 9 months ago
Quoteleadinglights I would be interested to see what your results are as I looked in some depth at various materials and geometries for hotends and came to the conclusion that the race is a lot closer than you might think. One starting assumption that I used is that having a high specific heat is a good thingas it acts a a heat store while the heater is trying to catch up. From this point of vieby rq3 - Tech-Talk
Silver Heat Block - 9 months ago
With the VDE-100 Schnekenstruder working as expected, and diamond nozzles on the way, it was only fair to make a proper heat block to mate with my tri-metal heat break. So I ordered 3 troy ounces of pure silver casting grain, and spent some time making molds from 3D printed forms. Why silver?: Cons: 1) It's expensive. Currently $20-$30 per troy ounce. The heater block will weigh about an ounceby rq3 - Tech-Talk
Re: Delta calibration - 9 months ago
QuoteMikeCL I'm still trying this out since I upgraded to the new Marlin version Im running the delta calibration I'm at Iteration:5 and it seems to just go over and over again not stopping is this normal? Yes, it's normal. It will continue to iterate until one of two things happen: 1) It meets the "tolerance spec" in the Marlin G33 cpp file (the best result of the iterations), or 2) It gets toby rq3 - Firmware - Marlin
Re: A Very Different Extruder - 9 months ago
QuotePCR This is about the 5th time someone's linked to this video. It's a completely different mechanism.by rq3 - Tech-Talk
Re: Diamond Nozzles, and the aftermath - 9 months ago
QuoteNathanaelXYZ Quotethe_digital_dentist I wonder how they manage the difference in thermal expansion coefficients of the diamond and brass that it's mounted in... The kickstarter page mentions that the nozzles should not be used above 300C-- assuming they install the tips to an interference fit by heating the brass, perhaps this is the point at which the diamond is at risk of coming loose? Bby rq3 - Tech-Talk
Re: Diamond Nozzles, and the aftermath - 9 months ago
Quotethe_digital_dentist I wonder how they manage the difference in thermal expansion coefficients of the diamond and brass that it's mounted in... I don't know. From their images, it appears that the diamond itself is conical, and fits a conical recess in the brass. There doesn't appear to be a retaining ring of any kind. It may actually be brazed in place (which might explain the temperature lby rq3 - Tech-Talk
Diamond Nozzles, and the aftermath - 9 months ago
For whatever reason, USSupply. who has been manufacturing industrial diamond products for decades, has a Kickstarter campaign for their "Diamondback" 3D printer nozzles. They certainly don't need the minor funding, but, what the hey, I signed up and I'm expecting my 0.4mm diamond nozzle in November. It's cheaper than an Olsen Ruby, and unlike an Olsen the diamond itself seems to have been manufacby rq3 - Tech-Talk
Marlin Weirdness, and a fix - 9 months ago
I've been using a home-brew piezo sensor firmly glued under the bed on my delta for several months. It works very well. Very rarely on an M48 probe repeatability test, it would skip a few motor steps, and the same might happen during delta calibration and bed leveling. The bed on my delta is very securely fastened to the frame, and quite some time ago I took pains to ensure that the bed could exby rq3 - Tech-Talk
Re: Marlin with Markforged_XZ - 9 months ago
QuoteMustang66 Well, still don't know why can't attach a file that's 5 or 7 mb when it says largest is 8mb but: I figured out the problem with my Markforged_XZ addition to marlin.It now operates the same as _XY does except with the z axis instead of y axis. If anyone is interested let me know. The RepRap forums say they have a maximum file size of 8MB. It's really 800KB (0.8MB ). You're limiteby rq3 - Firmware - Marlin
VDE Extruder Paper, BOM, and STL files - 9 months ago
Attached are the files I use to actually make the VDE-100 (schnekenstruder) as it exists on my delta printer, along with a short descriptive paper.by rq3 - Tech-Talk
Re: Very Different Extruder Bill of Materials - 9 months ago
Sorry for the new post. For some reason I can't edit my BOM post. Attached is the STL file for the 5mm axle bearing carrier, edited and tuned to 1 micron. I print this directly in PLA at 50 micron layer height with a 0.4mm nozzle. I slice with the latest Cura with the Arcwelder plugin, 100% concentric infill. For those designing the CAD file directly, note that every time you move the origin axiby rq3 - Tech-Talk
Re: A Very Different Extruder - 9 months ago
Quotedekutree64 I've decided to go with the canted axle/sharpened bearing flange approach. I'm not sure my mill could handle boring out a 10mm steel screw, nor do I have an easy way to get it centered and vertical under the spindle, so I'm going to have to make some new fixturing regardless. And the bearing should be sharper and longer lasting. I'm using a 4x8x3mm flange bearing because it's whaby rq3 - Tech-Talk
Very Different Extruder Bill of Materials - 10 months ago
Attached is the Bill of Materials for the Very Different Extruder (VDE-100), or SchnekenStruder. These are all common industrial parts, and require no machining with the exception of: 1) The Belleville washers act as preload springs for the bearings, and need to be stacked together, spun in a lathe, drill press, or a drill mounted in a vise, and ground with a dremel tool abrasive disc to an outsby rq3 - Tech-Talk
Re: A Very Different Extruder - 10 months ago
Quotedekutree64 Thanks, that confirms my thoughts. I probably could make a fixture to mill/drill the tilted axes on my 3DOF mini-mill, but I'd actually prefer the higher effective gear ratio since it should allow using even lighter motors. There is one seller for pancake NEMA11 on ebay, though it costs $25 with shipping, and has a 4mm shaft, which doesn't leave much meat after drilling a 2mm holeby rq3 - Tech-Talk
Re: A Very Different Extruder - 10 months ago
Quotedekutree64 Brilliant design! Might actually be light enough to convert my SCARA printer to direct drive. I have a 50 gram round NEMA14 I could use. And TMC2209 drivers, so I can adjust the microsteps to whatever works best. I'd prefer to use non-canted axles so I can make the carrier out of aluminum, but would all three rollers need to be threaded then since the filament would be getting draby rq3 - Tech-Talk
Re: A Very Different Extruder - 10 months ago
QuoteVDX ... there where/are some other versions too around -- it's an older principle, patented 1952 by a Mr. Uhing for moving spool-heads on horizontal axes ... but could be used for other tasks too Especially this "scewed tap-rollers" were sometimes used for special high precision CNC-applications ... I'm not sure what you mean by "screwed tap-rollers". The Rohlix linear drive is commercialby rq3 - Tech-Talk
Re: A Very Different Extruder - 10 months ago
Quotethe_digital_dentist rq3: This looks quite similar to your extruder: Yes, mentioned and linked to earlier in this thread. However, my drive rollers are not gear syncronized. Completely different design, unless we all want to give credit to Archimedes. And I do. Generally there is rarely anything new under the sun, which is part of what makes the current patent system unworkable. Different tby rq3 - Tech-Talk
Re: Very Different Extruder in action - 10 months ago
QuoteVDX ... my own designs are named something like "RollRing..." for the German name ... maybe something with "...spin..." or "...spinner..."? I have a small woodworking tool known as a "gimlet", basically an auger with a screw point, driven like a screwdriver, used for making tapered holes for wood screws. In German it's called a "schnekenbohrer", or something like that, meaning drilling snaiby rq3 - Tech-Talk