Hobbing Thing Improved
by wildseyed, published
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I use an M4 tap, but only because I did not have an M3 handy. I don't go very deep at all with my bolts. Just enough to get traction. I leave it to the guides in the idler (UniX Wade Extruder) to keep the filament lined up.
The reason I mention using three depths is to get more consistent results, rather than leaving it up to how much pressure you put on the tap.
What size tap do you use? I think I used an M5, which left plenty of room with a 625.
Moving the bearing lower to progressively cut deeper only really makes sense if the tap sits snuggly enough in the bearing to prevent rotation. Otherwise the cut depth can be adjusted by just putting a little pressure on the tap as it's cutting in. Personally, I found that approach to work fine without any fancy adjustments.
I don't use a bearing there either. Ideally, there should be three of these blocks. The first one should barely score the bolt, and the other two should progress from there. If I do that, I'll have to add some features to make it easy to remove the bearings without damage. Maybe just a hole to push them back out. Keep an eye out for that next weekend.
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