SHORT SUBJECT #6 BROACHING KEYWAY tubalcain mrpete

This is number 6 in my "SHORT SUBJECT" video series.
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#keywaybroach#pulleykey#arborpress#dakepress#machinist#machineshop#broaching

[Swampyankeehomestead]

618 Atlas countershaft pulls. People throwing each other under busses for those parts and Mr Pete is using them in demonstrations.
Love it!

[NBCRGraphicDesign]

Fantastic short! BTW, it is nicer to hear birds chirping in the background rather than Sammy, your shop cricket. I do miss Tommy's spite-mowing, however.. RIP

[componenx]

One thing I learned that usually isn't noted- the bushing must be at least the same length as the hole it it's being used in. If it's shorter, the broach will try to bend and break.

[missingthes]

It's interesting this comes up as I was discussing a complex 3 leaf clover shape of hole for a die and punch. My first thought was EDM but then realized I need a matching punch and if the punch is machined to match the die then the punch blank can be turned into a broach and the die made via broaching. We're talking about a very small pattern at less than 1/10" in diameter.
I would have to be done either with a set of progressively larger broaches or one exceedingly long one that will have to be drawn through with extreme care to minimize stress on the tool. Either way is a lot of cutting. I am tending on the side of a series of progressively larger broaches. I know they're tapered but the taper cannot be too extreme (hence option 2) for the small size involved for the thickness of the tool steel plates to be broached(x2 1/2" thick plates).

I figure this is a tall order but I like a challenge.

[PaulSteMarie]

Nice job! You made that seem effortless.

You must have had your Wheaties this morning 😁

[georgelevett]

Not really a safety concern but when you have finished using your machine the belt tensioners are released due to belt stretch, Right or Wrong ? Mr Pete