Home Built Rotary Broach

jumps4

jumps4

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I ran across this site this morning and thought others would be interested. this looks easy to build and the cutters would be affordable to make also. the site is "Mikesworkshop" and has a lot of mods and interesting information. check out his homemade broach and watch the video at the bottom, it seems to work very well.
http://mikesworkshop.weebly.com/rotary-broaching.html
steve
 
jumps4 said:
I ran across this site this morning and thought others would be interested. this looks easy to build and the cutters would be affordable to make also. the site is "Mikesworkshop" and has a lot of mods and interesting information. check out his homemade broach and watch the video at the bottom, it seems to work very well.
http://mikesworkshop.weebly.com/rotary-broaching.html
steve
Click to expand...

Rotary broaches always seem like some kind of machining magic to me!

Good link, I like Mikesworkshop, he's got some good stuff on there.

M
 
Thanks for the post , some interesting things there. will have to check it out again later.

am curious about rotary broaching, never heard of it before, and it was interesting to see that it is performed with the lathe running.
 
I'v looked at rotary broaches online and the price is wild, this is for the home shop where your not going to be using it to make thousands of holes. it will do square also if you make the cutter. but i'm sure the cutter will take more force for a square hole.
steve
 
here's a visual how a square drill works:
[video=youtube;L5AzbDJ7KYI]http://www.youtube.com/watch?v=L5AzbDJ7KYI[/video]
 
The company in Pittsburgh that makes the rotary broaches for square, hex ect. is called Watts I believe. Prices are high, but they do work. a asia company is now making them and most likely for less money.
Paul
 
I've only used Slater, but they do work. In harder materials, it does take considerable pressure. Seems like too much for a BP type mill, but in the lathe, a tailstock provides enough.
 
my point here was if you wanted to try to build your own
like for "hobby machinist" use lol
steve
 
jumps4 said:
my point here was if you wanted to try to build your own
like for "hobby machinist" use lol
steve
Click to expand...

Yeah, I get it, but it's always interesting to see the commercially available product and how it's priced.
That only increases the desire to build your own! :))

The commercial broach holders allow the bit a certain amount of out of axis movement which I always thought was necessary for the bit to climb around inside the hole.
Unless I'm missing something, Mike's one only allows the bit to rotate and yet it still seems to do the job.
Can someone explain for me?

Thanks,

M
 
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