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Old 04-29-2012, 06:08 PM   #11 (permalink)

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Default Re: Cutting internal keyways

Everything you ever wanted to know about broaching a keyway, just don't bang your broach on your workbench like the guy in the video......

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Old 04-30-2012, 06:20 PM   #12 (permalink)

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Default Re: Cutting internal keyways

In a pinch you can mount a square tool blank in the tool holder of your lathe and use the compound slide to broach the keyway. Of course, you will have to grind the right geometry on the broaching tool for it to work.

It might be hard on a mini lathe though...

Tubalcain has some great machining vids on Youtube. Every wannabe machinist should watch.
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Old 05-02-2012, 12:30 AM   #13 (permalink)

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Default Re: Cutting internal keyways

This is some great information, thanks, very useful. Its much more accurate than the way i did a pulley for my wood lath, i used three hacksaw blades on my hacksaw then cleaned up with hand file, been using for two years now and no problems yet...
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Old 05-02-2012, 08:13 AM   #14 (permalink)

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Default Re: Cutting internal keyways

I think he said he started out trying to cut a key with his Lathe saddle. It works, but you need a solid setup and it does as much scrapping as it does cutting.
I've seen dedicated linear slides built that held a ground bit and bolted in place of the tool post.
A Chinese broach set is dirt cheap and considerably faster. You just need an Arbor press tall enough for your needs....
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Old 05-02-2012, 10:48 AM   #15 (permalink)

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Default Re: Cutting internal keyways

Moving the bed back and forth works but its slow. I've been doing a little bit each day and I'm about .10 deep I need to be at .12.
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Old 05-02-2012, 01:16 PM   #16 (permalink)

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Default Re: Cutting internal keyways

This is an example of a linear slide I was talking about. Faster than moving the carriage, but ........

Dog Rough Key Way Slotter
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Old 05-02-2012, 01:29 PM   #17 (permalink)

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Default Re: Cutting internal keyways

I designed one similar to that after reading that thread a year ago. I got all the pieces made, just need to put it together.

Madmodder is another informative forum general machining. Some pretty neat projects on there too.

Are you a member of that site vidio1?

Paul
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Old 05-03-2012, 12:44 PM   #18 (permalink)

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Default Re: Cutting internal keyways

Quote:
Originally Posted by fatal-exception View Post
I designed one similar to that after reading that thread a year ago. I got all the pieces made, just need to put it together.

Madmodder is another informative forum general machining. Some pretty neat projects on there too.

Are you a member of that site vidio1?

Paul
Yeah, and a few others. Mostly about metal working and machining but occasionally I visit a Robotics or electronics site....
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