Saturday, 10 January 2009
Feeding ABS with Worm Gears and Threaded Rod
Here's a method (inspired by all the other folk experimenting with alternative filament feeds) of feeding filament using Worm Gears and 3mm Studding.
Next job is to design the holder to mount it all to a RepRap extruder and a feed motor assembly.
The pitch of the M3 is 0.5mm per turn giving a feed rate of 0.5mm per turn of the drive shaft.
The tooth pattern cut into the gears is aprox 1mm deep so 0.33 of the diameter of a nominal 3mm plastic filament.
Whilst it all feels to grip prety well I will need to actually make an assembly and do some measurements to see how well it works really.