darmach's blog

tech junkie

Hobbed bold hobbing

The result

One more thing I need for the extruder is the hobbed bolt. Somewhere on the internetz I’ve found an opinion (I don’t really remember where..) that hobbed bolt which teeth are cut from the threaded part of the M8 screw have even better grip than tapped one. So I got few M8 fully threaded screws, and constructed a tool for hobbing. It uses dremel flexible hose, and those thin cutting disks – 0,6 mm disks allow for a finer teeth to be cut.

Rotating disc that holds the screw have 20 holes – which are a match for a 6mm ball pushed against it by a spring. This way I could measure each step I’m cutting. And here is the final result – isn’t she a beauty?!

The result

The result

I also made a video while hobbing – a little bit shaky, but it’s hard to hold camera with one hand while cutting… …probably will have to get some stand in the future.

New toys arrived: Infill3D extruder!


Today I’ve received printed parts for extruder – I’m making extruder designed by Infill3D, you can check it out on thingiverse. Aside from the design being very pretty – parts are amazing! Printed on industry class SLS – are actually so precise, I had problems with removing the bearings after taking pictures. I must admit I’m tempted to paint it red, as Infill’s renders on thingiverse.