The Shop > Tools
Eureka form relief tool
Rob.Wilson:
Well I am not telling you :lol: :lol: :lol: :lol:
Rob
awemawson:
--- Quote from: AdeV on December 18, 2012, 04:48:36 PM ---Pardon my ignorance, and possibly stupidity; but what's the purpose of the tool; or, to put it another way, what, other than making a wiggly-shaped cut on a piece of metal, what does it do?
--- End quote ---
Let Google be your friend :)
raynerd:
Rob - wow! I didn`t know it was shown in books prior to Ivan Laws book. Thanks for posting the book page. I see the top of the page says: Machine Shop Chat - is that the book title, I`d be interested in reading more?
Rob, do you find yours works OK and can you see any issue I may have running mine from the 3 jaw rather than turning between centres. Mine was made with NO eccentricity on the wheel cutting arbour so the damn wheel cutting end turned concentric with the lathe! To correct it, I`d either have to remake the majority of the centre eccentric parts or, the method i used, was to turn up an eccentric sleeve to slip over the end, held in the 3 jaw which puts the eccentric motion on the wheel holding section.
Ade - imagine a 12 tooth multitooth wheel cutter. This could be easily made using the button method or similar, jabbing the correct profile into the outside of a disk of steel and then cutting the gaps to create the teeth. The problem is that there is no relief on the teeth. This tool puts the relief on the teeth. You have to set it correctly so that the eccentric motion is cutting the "back" side of the teeth and forming the relief. I.e you cut away the yellow on the image below:
awemawson:
--- Quote from: raynerd on December 18, 2012, 08:02:34 PM ---Mine was made with NO eccentricity on the wheel cutting arbour so the damn wheel cutting end turned concentric with the lathe! To correct it, I`d either have to remake the majority of the centre eccentric parts or, the method i used, was to turn up an eccentric sleeve to slip over the end, held in the 3 jaw which puts the eccentric motion on the wheel holding section.
--- End quote ---
Is it not supposed to be mounted in a four jaw chuck, so that the 'throw' of the eccentric is adjustable not fixed ?
John Stevenson:
No the body which holds the eccentric runs true so 3 jaw, the eccentric part has an off set center in the end so although the eccentric runs eccentrically the center runs true so it can be supported.
Intersting thing with these is no matter which way the tool runs the cutter being relieved always runs forward
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