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Ady1	05/01/2012 11:06:50
6137 forum posts 893 photos
David Littlewood	05/01/2012 11:27:02
533 forum posts	One thing not mentioned in this discussion of T-slots is the desirability of doing it in two stages. The first is to cut a regular slot with a slot drill* of the desired width; the depth should be at least the depth of the finished T-slot, and preferably a shade deeper. Then replace the slot drill with the T-slot cutter and go through again. The result will be far cleaner than you will get using the T-slot cutter to plough through virgin metal on its own. I have cut T-slots on my Emco FB2 (a fine machine but not perhaps one for heavy cuts) which are accurate and cosmetically fine even in mild steel. See photo below: Note use of slot drill - a 4-flute end mill is not* the thing to use for this job, it will make a ragged slot. If you only have end mills, use the next size down and widen the slot with further passes. David Edited By David Littlewood on 05/01/2012 11:29:46 Edited By David Littlewood on 05/01/2012 11:30:00
Oddlegs	05/01/2012 16:28:00
7 forum posts	How on earth can you produce a T slot without cutting a vertical slot first?
David Littlewood	05/01/2012 17:12:08
533 forum posts	Yes, I don't know what I can have been thinking of! Still, the advice to make the slot slightly deeper than the required T-slot is worth saying, as is the advice to avoid using an end mill. David (wearing sackcloth and ashes)
JasonB	05/01/2012 17:18:21
25215 forum posts 3105 photos 1 articles	You were probably thinking of a dovetailed groove rather than a tee slot. J

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