Home Built Rotary Broach

Oh, it's a wobble process. If you get to make one, or see one on action, you'll see what I mean. I guess they just figure they will be able to move the material. I'd expect it to take much more thrust. I wouldn't want to try it on tough materials. I've tried a simple 3/16" hex in 17-4 H900 and it took a lot of pressure. And the result was blown out burrs on the exit hole and a rough finish through.
 
in the pic of the ebay item you can see the tool holder is off center this is not set to one side but at a different angle from the spindle axis by about 1 degree
steve

$(KGrHqZ,!pQF!GIrHw4hBQMP52Gqiw~~60_12.jpg
 
jumps4 said:
in the pic of the ebay item you can see the tool holder is off center this is not set to one side but at a different angle from the spindle axis by about 1 degree
steve
Click to expand...

That must have been one special used broach holder, it just sold for $400 inc shipping; which is interesting because you can buy a brand new one (different make) of the same size for $325 inc shipping! :thinking:

http://www.ebay.com/itm/NEW-Basic-R...=261084964075&ps=63&clkid=1555671043669867512


M
 
If you're looking for something more for the hobby machinist, take a look at LMS. They have wobble broaches in the $35 range, with MT2 holder for $80 and R8 holder for $100 (shown in the catalog only).

You could make a holder based on what we've learned on this thread and buy the cutters as needed.

http://littlemachineshop.com/products/product_search.php?critFast=rotary+broach&B1=Product+Search

Actually, you might have to make your own holder. They don't seem to list them on their site. From what I've seen, most wobble broaches have a 1/2" shank, but the LMS ones appear to be more like 1/4". The largest they carry is 3/8", in hex and square.
 
nice piece of info thanks mike
thats in the range of my budget if my home built efforts dont work out
steve
 
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