How do I?

[DMS]

Link to video of homemade rotary broach, and webpage on construction

[video=youtube_share;T8EhGxH7z_w]http://youtu.be/T8EhGxH7z_w[/video]

Another alternative is to counterbore the hole, and then locktite the head of a socket head cap screw in place. It will not look as nice, but it will work quite well.

 

[DMS]

Re metric conversions, 1 inch == 25.4mm. For quick and dirty conversions 25mm is just about an inch, and 6mm is right around 1/4".

 

[Tony Wells]

Sorry,Tony. I was .0004" off!!! (but,those tenths add up) Well,that's what I get for becoming an old duff. BUT,I do know where to look such stuff up when I need to know!!

I think that's what someone called being educated: Knowing where to look it up!! For quick reference,I can consult my trusty Leatherman,which has inch and metric scales on it.

Hehe.....George, I was gonna let you slide on the 4 tenths, but you lost a decimal place there.)

 

[george wilson]

I know 20 MM is 81 caliber. I have a sawn off 20MM barrel that I have the urge to mill octagonal and make a flintlock African rifle from. I've actually seen such at gun shows!! The era of the slower moving ball being made more massive to increase its punch. As bad as my shoulder is,I'd likely not shoot it much. Probably the twist is way too fast,anyway,though I could saw off an inch and make it into a bullet mold to cast the rifling in and make it take in the barrel like a rifled slug,only in a rifled barrel. Certainly,I'd never shoot an elephant even if I could. My wife was really vexed by Donald Trump's son shooting an elephant for kicks and getting his picture made with it. You can do that if you pay enough money. Might could blow up a 5 gallon can of water,though !! Imagine the shock!!!!!

 

[Ray C]

If you have one, a shaper is good at that task. You don't see too many around anymore but it's on my project list of things to build one day. I passed-up a chance to get a table-top unit and am still kicking myself.

EDIT: Here's what they look like: http://www.boyerfour.com/metal/ammco/ammco.htm

We had one in high-school that was hydraulic and had a 2 foot throw, very cool tool.

 

[Tony Wells]

That particular job would be sort of awkward on a shaper. Roughly 0.160 hex X 1.125 long. It's a broach job, for sure, but we are discussing alternatives. I wouldn't want to do it on my shaper, anyway. It's a 24", so it wouldn't have any feel for the tooling.

 

[Ray C]

You got one? Cool !

That particular job would be sort of awkward on a shaper. Roughly 0.160 hex X 1.125 long. It's a broach job, for sure, but we are discussing alternatives. I wouldn't want to do it on my shaper, anyway. It's a 24", so it wouldn't have any feel for the tooling.

 

[Tony Wells]

Yes, I have a G & E 24" from the late 40's/early 50's best I can tell. Never tracked its history down. Have an original manual. It was a DC machine, as most Navy machines are, so I suspect it came off a vessel of some sort. It has been properly converted to 3 phase. Weighs about 8k. Good, solid machine.

 

[Ray C]

... Strong feelings of envy right now. "jawdrop:

Yes, I have a G & E 24" from the late 40's/early 50's best I can tell. Never tracked its history down. Have an original manual. It was a DC machine, as most Navy machines are, so I suspect it came off a vessel of some sort. It has been properly converted to 3 phase. Weighs about 8k. Good, solid machine.

 

[trapper]

Flutedchamber beat me to it... Oh, what the heck is a mm ? I thought you Brits invented the English standard measurement system, hence the term...

Yep we did but like evrything else if it's good we give it away and use something else to make do...... i'd prefer imperial to metric but it's easier to get metric stuff here