Quoteeades850 People forget that it is not the voltage that kills, it is the Amperage. Current 40w extruder heater cartridge draw nearly 3.4 A. It only takes 1/4 A to kill. This is true... but only on the most literal level. A voltage source doesn't have a set amperage, is has a max amperage. A 1.5V 10000000000A supply won't do shit to you when you touch the leads... this is because the loadby MachineHum - Developers
Quotecrispy1The limiting factor turns out to be the rate at which you can feed and melt the plastic. Extrusion force and melt chamber pressure climb rapidly as feedrate increases. At some point you're going to a) strip the filament b) explode part of the bowden system (don't use PTC fittings) or c)or explode the hotend. I think this is going to be your main limiting factor. How much does itby MachineHum - Developers
Thanks for your reply, that's very interesting... do you have plans in the future to build an adapter from the RPI headers to the RAMPS headers?by MachineHum - Developers
Quote691175002 QuoteEzrec Yes, and optical encoders and a good control system takes all that backlash out. I have a gear motor with a rubber grommet driving a fishing line belt system, and I get 250 micro resolution on that axis without even trying hard - it's all about the encoder when working with DC motors. Even though your system will maintain positional accuracy when moving in a single dirby MachineHum - Developers
QuoteEzrec QuoteMachineHum Quote691175002Gearboxes introduce a disgusting amount of backlash until you start paying 200$+. Truth... Yes, and optical encoders and a good control system takes all that backlash out. I have a gear motor with a rubber grommet driving a fishing line belt system, and I get 250 micro resolution on that axis without even trying hard - it's all about the encoder when woby MachineHum - Developers
Quotedc42 Repraps do not need 5V tolerant controllers, in fact the more modern controller electronics (e,g, Duet electronics, or Arduino Due + RAMPS-FD) are 3.3V. That said, I am not sure that the RPi is an ideal solution, for example because it lacks ADCs. I've spent time looking through the ramps schematic... This point seems to be correct The datasheet says the stepper drives are 3.3V tolby MachineHum - Developers
This thread is interesting... I just posed about some things about speed considerations a second back...by MachineHum - Developers
Quote691175002Gearboxes introduce a disgusting amount of backlash until you start paying 200$+. Truth...by MachineHum - Developers
What's typically the speed limitations on a printer? Because if it's the x/y travel speed with steppers, I feel pretty soon there will be a large push for DC or BLDC motors for position control... With a well tuned PID loop you can achieve amazing accuracy and extremely high speed, also: with printers we're talking about consistent load so this makes things a lot easier... I'm not overly concernby MachineHum - Developers
Hey guys, Is there currently an open source solution for DC or BLDC motor control? something like RAMPS? I've looked and can't find anything...by MachineHum - Stepper Motors, Servo Motors, DC Motors
Yeah I can get some pictures for sure when I get home.by MachineHum - General
Hey guys, I got a Davinci XYZ printer... it's not bad. But not really geared towards the maker/hacker community. I want to be able to customize my prints more using slic3r... I know there are hacks to get this to work... But honestly I rather just install all new electronics... I can pick up a RAMPS 1.4 kit for cheap off ebay... My question is... has anyone done this? it sounds alright in theorby MachineHum - General