| Gallery, Projects and General > How do I?? |
| How do I do this? |
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| daz:
I need to make the part in the drawing below. I can do the turning etc, but the one thing I am struggling with is the recess. I don't have a tool small enough so I tried to make one last night out of a piece of hardened steel. It worked ok for a short time but then started chattering like crazy and snapped, unfortunately ruining the piece by ripping through the outer wall. Can anyone show me the way please? TIA Daz |
| jim:
end mill and rotary table? |
| daz:
I don't have a rotary table unfortunately :( Sorry I should really have said what I have at my disposal, might have made it a bit easier. I have a small lathe and an eagle 30 milling machine. I look forward to the day I can justify a rotary table for it :drool: cheers daz |
| Fergus OMore:
Daz, What you need- and I mean NEED is a copy of George Thomas's Model Engineers Workshop Manual. If you can rustle up more cash, get a copy of Sparey's The Amateurs Lathe and perhaps GHT's Workshop Techniques. You desperately need the ability to make good boring tools and understand how they work. Despite ALL this prattle about carbide 'doo dahs' bought from a shop, there is NO substitute for a set of little tools made up on a home grinder out of- old hexagon keys or bike spokes or something 'equally exotic' Where you probably went wrong is not giving enough side relief on your now broken tool which jammed against the outside bit of the cut in the hustle bustle of swarf and crap. Again, you might have had the wrong tool height- which alters the cutting geometry of your tool. Having written all this, might I remind you that you have more than most 'big' items but now need to make those nice little items that do the work. George Thomas rightly mentioned that 'if you didn't have the proper little bit at the cutting end'-- well, read on. Let us know if I have it right, please! You'll enjoy the progress. |
| daz:
I think you could be right about the side relief, it was fine when taking small side cuts off from the first groove I cut but really noisy when doing a cut the full width of the tool if you see what I mean. Thanks for that, I will go and have a look for the books you recommended and some more reading. thanks daz |
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