torsdag den 21. oktober 2010

The other way around blog - Mendel almost done - Details to come later

Usually a Mendel blog will show you all the details of creating, assembly trouble shooting and more, and eventually reach completion. As I have started blogging way too late in the process, the mostly done Mendel pictures follow here, and details will appear later. Maybe also combined with pictures of some of the next Mendels that are being assembled in my hackerspace: Labitat.dk




The almost finished Green RepRap Mendel

And a few closeup

Front view


Rear view - with better view of the Heater and Temperature control board
The design of the Heater and Temperature control board has two on/off (PWM) channels for the Heated Bed and two for the extruder heater. I plan to add a fan and light on/off (PWM) board with 4 channels. I use MOSFET HUF75337 as it has several built-in protection features - and can easily handle more than 20Amp (specifications say 42Amp continues and 75Amp bursts), so I expect the PCB wires to "blow" way before the MOSFET.

The PC power supply hook up.

There are two separate 12V rails, one for the Heated bed, and one for the rest. Designed with the intent to make sure that less than 10Amp is drawn on each wire/socket pin (preferably much less per wire/socket pin). Currently the heated bed can draw 2x7Amp (rail 1 on two wires at max 15Amp), the extruder heater 2x2½Amp, all the steppers run fine on a handy 2Amp test power supply that used to be an external USB drive power supply (rail 2 on three wires at max 8Amp). So far no wires or power connectors should overheat.




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