how to make a hole /dogleg tool
This is a newbe question I'm working in aluminium, the origional plans I'm following had a lot of work done on a Lathe I'm attempting to do it with a mill on a rotary table (don't presently have a lathe) (Nothing spins so perfectly round/ concentric is not a big issue) I need to cut a chamber behind a 1" threaded opening. The chamber is round about 1.75" in diameter and .375 deep. The instructions i'm following said to use a dogleg tool on the lathe. since i'm trying to do this on the mill its a bit different. So several questions.... 1)If I go borrow a friends lathe, where can I get/ how do I make a dogleg tool? I just know this is going to be answered something like "make a steel tool and grind the proper relief, rake and chip clearance..." Where can someone learn what all the bit/tool grinding names mean, releif, rake etc.... 2)What tool would you use on a mill to do the same job What tool would you buy or how would you make it? I've been thinking that something like a tslot cutter would be the proper tool. Alas finding one with a 1/4" shank and 1" cutter head may be tough. My other option is to just machine it out to 1.75 then weld a plate/ plug in the top of the hole, and machine the hole back out to 1" and thread it. Paul |
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