Obviously - DA D - DC on input (to RAMPS) A - AC on output (to mains)by Andrey_SSh - Look what I made!
Zero cross relays is not suitable for transformers. It is worse then stupid switch. Two types of "smart" switches exists: 1. turn on after zero cross immediately -- for resistive loads. 2. turn on after zero cross + 5 ms -- for inductive loads (transformers) Stupid switch will turn on in random phase with random magnetizing current spike. Second type switch - will turn on in 90 degrees phase wby Andrey_SSh - General
On RAMPS microstepping jampers connected directly to stepper driver IC and not connected to main controller.by Andrey_SSh - General
OpenSCAD box.scad ---------------------------------------------------------------------- w=100; h=50; l=120; t=2; difference() { cube(); translate()cube(); } --------------------------------------------------------------------------- In my opinion more simple software is not exists.by Andrey_SSh - General
>Стекло слишком гладкое По идее пластик должен за счёт сил Ван-дер-Ваальса держаться на абсолютно гладком стекле. Зашкуривание требует периодического повторения.by Andrey_SSh - Russia RepRap User Group
Печатаю на оконном стекле. Платформа - 100° по датчику, но на поверхности стекла конечно меньше. Сопло - 230°. Протираю спиртом непосредственно перед печатью (пока стол нагревается). Кроме того заметил, что если нагреть стекло и/или сопло сильнее чем нужно, то пластик прилипать перестаёт (по крайней мере PLA).by Andrey_SSh - Russia RepRap User Group
About filling 105% filling needed. 5 mm is too thick and expensive. I have no expirience with PET. Nylon is capricious material.by Andrey_SSh - Experimental and Hobby
"Connecting area" is not the whole problem. Soakage trough tiny cavities inside solid walls will take place. Heavy rain drops will produce high dynamic pressure during impact and small amount of water will soak inside. For simple shapes it is possible to print case with hightened temperature and extruder feedrate. Result will be relatively sealed, but with some aesthetic flaws. (as gray tray thby Andrey_SSh - Experimental and Hobby
Printed parts always have cavities. High waterproof is unreachable without additional works.by Andrey_SSh - Experimental and Hobby
Adhesion of trimmer line to paint scotch (with paper like surface) is good, but adhesion of scotch itself (to bed) is not so good. Sometimes delamination occurs.by Andrey_SSh - General
Я просто включаю стол на принтере и ложу бухту на него. Часа за три-четыре ломкость проходит.by Andrey_SSh - Russia RepRap User Group
Useful for printing gears, pulleys and wheels. Relatively difficult make round things with cartesian printer.by Andrey_SSh - Let's design something! (I've got an idea ...)
Я печатал упоры для поддержки подоконника. Года два уже простояли (в тени). Из деталей, которые на свету одна треснула и рассыпалась. Почему только одна не понятно. Рядом множество точно таких же.by Andrey_SSh - Russia RepRap User Group
4 mm >free the print During bed cooldown auto separating occurs due to difference in thermal coefficients between a glass and a PLA (ABS).by Andrey_SSh - General
A pice of window glass works fine. It is flat, smooth, durable, cheap and available. But heavy relative to aluminium plate.by Andrey_SSh - General
Some experiments was conducted for voltage and capacity optimization. Conclusions: 1. Voltage more then 100 V leads to smooth edges. Shape of the electric field around the electrode is smoother then shape of electrode itself. 2. 100 V sparks are noisy as tiny petards. 3. For 35 um copper, spark energy must be about 15 mJ (independently of voltage). More energy - jugged edges. Less energy - lowby Andrey_SSh - General
Inertia moment: J = 0.5 * m * R^2 Kinetic energy E = 0.5 * J * w^2 Stepper: R = 0.02 m m = 0.26 kg w = 100 rpm = 5 rad/c J=0.000052 E=0.00065 J Small DC: R=0.005 m m= 0.011 kg w=10000 rpm=500 rad/c J=0.00000014 E=0.0175 J *(values are rough) Small DC is more "inertial" then big stepper due to high speed.by Andrey_SSh - General
I am use this, and have no jamming.by Andrey_SSh - General
Notebook's PSUs usually are galvanically isolated. May be MAC's PSU damaged too (or it is Apple's feature).by Andrey_SSh - General
Quotemadcowswe It is an open source But, where source is? Only general description at the link exists. Quotemadcowswe ...energy regeneration... recuperation - more suitable term. (Yes, it is funny remark considering my english). Quotemadcowswe ...Li-Po ... variable voltage DC bus ... DC-DC converter ... With LiFePO4 a 3%-stability achievable without additional converters.by Andrey_SSh - General
As far as i know, mouse sensors are very sensitive to distance between lens and surface. Belt vibration may cause errors. Belts are too glossy and have a solid color. A ruler mounted (printed) on a rail and sensor on a carriage will work better (perhaps).by Andrey_SSh - Let's design something! (I've got an idea ...)
QuoteTraumflug Yes, Voronoi paths are quite usable, I use them all the time. For PCB or other purposes? Briges appeared due to head fault. Electrode-wire was broken during process (metall fatigue). After refit process was restored, but G-code position was choosen erroneously. Tiny unvisible briges also appers sometimes. >Start with paths on the far No. This is the raster machine. Vector moby Andrey_SSh - General
New algorithm of pcb processing. Source: Processed: Manufactured: This metod needs less head movements, so it is faster. Additionally: - less trace resistance - less heat resistance - more stray capacitance.by Andrey_SSh - General
Thanks. Capacitor charger. Needs powerful bipolar transistor (TO-92MOD or more) for charging and signal FET (SOT-23 enough) for charging interruption during short-circuit. Optocouple used for spark detection. Electrode operates by small DC brush motor. Motor controlled with simple H-brige driver by main controller (ATMega32). Syringe nidle used for electrode direction. All PCBs (8 total) oby Andrey_SSh - General
Not definitely better, but possible with this SSR. Scheme with convertor possible too. Changing ramps's components is not needed in any case.by Andrey_SSh - General
It is primitive EDM. A lot of improvements needed. Gap control - one of them. Electrode under voltage just descend until spark occurs and rise immediatly after that. Spark detected by voltage drop at feeding capacitor.by Andrey_SSh - General
With optically isolated solid-state relay you may use two independent PSU for heatbed and ramps.by Andrey_SSh - General
Hello. As you can see my english is not too good. So I'm sorry. I will be happy if my messages will be corrected by anybody. I want to discuss the printed circuit board manufacturing technology, using the electric discharge machine. 1. RepRap Mendel equipped with the oil tray and electrode, mounted on the extruder gear, Power suplay - 18 V, short circuit protected. 2. Special program forby Andrey_SSh - General