Gallery, Projects and General > The Design Shop

Broaching tool.

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awemawson:
In an ideal world you need to form the broach, harden it, then grind it to finished size and sharpness. In reality you probably don't have the kit to do it, so you need to protect the cutting edges whilst hardening. Assuming you don't have a salt bath available <G> probably the easiest way is to dip it in a foundry wash coat as used on tongs and stirrers. Something like Zircofluid 1219 from John Winter & Co :

 http://www.johnwinter.co.uk/foundry-products/mould-a-core-coatings

The fine cutting edges will oxidise very quickly when heated to hardening temperatures if uncoated. Remember when plunging in oil to cool, it must be held vertically or it will bend like a banana.

 :ddb:

NeoTech:
Sparky yes i plan to turn it between centers for a uniform size, then put in the dividing head and cut the straight flutes with a full radius endmill (5mm), and after that back to the lathe and do a interupted cut with a crazy sharp tool for the taper. taking off a little at a time..

but its prob. something wrong right there so.. *waiting for knowledge to fall into thread* or getting whacked with a stick.  :wack:

tom osselton:
I also want to do some broaching in the future and was planning to build this as I don't have a press http://modelengineeringwebsite.com/Broach.html
http://modelengineeringwebsite.com/make_broaches.html

NeoTech:
Thats looks kinda usefull though.. i have a 10 ton hydraulic press though so thinking of making a guide sleeve for the tool. but need to recalculate all the angles on that thing.

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