What lathe?

[Lakeside53]

I avoid using solid carbide when milling aluminum for that very reason, Hanita and International Mini-Cut make much better HSS/CO endmills. In production milling I've used a 1" mini-cut, full diameter, 1/2" DOC, 4000 RPM and 40 IPM. Sounds like pop-corn.

I agree. Jammed HSS would have possibly just tripped the table servos. It was the only 5/16 bull nose I had though and it had to be that size to miss other features. Now I have none and I need to go over over my tram again:bang:

Even on my BP I'm amazed how fast and deep can push quality 1/2 and 3/4 hss though aluminum. I really should try corn cob roughers - I have a bunch but never seen to get around to using them.

 

[Metals406]

Easy enough to make a bull nose to mount between a standard center and the part.

Too true. . . I have to reface an older one so it can be used -- and press a new bearing in it.

 

[blsnelling]

Wow, what can I say!!! A HUGE thanks to my great friend Rob, Stihl 041S, for this incredible "care package". It's like Christmas in September I'm now a member of the "Giant Dial Indicator Club"

 

[vincem77]

Nice score! Are those carbide drills?

 

[Stihl 041S]

You understand about non rotating now. And the two file cleaners in the picture.


Drills aren't carbide. But first choice for most work.

135 deg split point M-42 Cobalt.

Takes abuse and less interface and point pressure than standard drills and a few points harder.

Sorry for the machinist babble. Working exotics for years and you are always looking.

Like for the elusive T-15 drills.

Still babbling aren't I. Maybe there should be a "Machinist babble thread". Keep us off the streets.....

 

[blsnelling]

Babble on, my friend, babble on:yoyo:

 

[nmurph]

...Maybe there should be a "Machinist babble thread". Keep us off the streets.....

That's pretty much what this whole thread has been. It's like my understanding of Spanish: I speak enough to know when I am being talked about, but not enough to understand the whole conversation. But I just keep telling myself: Self, you didn't know diddly about saws either 5 years ago, so there is hope.

 

[Stihl 041S]

That's pretty much what this whole thread has been. It's like my understanding of Spanish: I speak enough to know when I am being talked about, but not enough to understand the whole conversation. But I just keep telling myself: Self, you didn't know diddly about saws either 5 years ago, so there is hope.

Always learning.

I'll say it again;

You know you are a machinist when you know 10% of what you THOUGHT you knew 10 years ago.

I just found out about deep trepaning and the HP required a couple of years ago. Hadn't heard of it. And I been at this 30+ years. (that makes me seem not quite so old)

 

[nmurph]

I just found out about deep trepaning and the HP required a couple of years ago. Hadn't heard of it. And I been at this 30+ years. (that makes me seem not quite so old)

You mean this?

I learned about it in freshman psych...30 years ago!!

 

[Stihl 041S]

You mean this?

I learned about it in freshman psych...30 years ago!!

You said you wouldn't tell!!!!

 

[nmurph]

You said you wouldn't tell!!!!

You reckon he preferred Goodies or BC?

 

[Stihl 041S]

You reckon he preferred Goodies or BC?

Bacon vodka......

 

[Nitroman]

Now THIS is a boring bar holder:

This is a clever design:

It is 3" diameter 8 1/2 pounds and the tool height is 1.450" so far too large for my lathe. My tool height is 1" exactly and the compound is 2.35" across. Ssssoooo...I think I can copy this one easily enough out of 4140 annealed? Boring bar holes are 3/4", 5/8" and 1/2".

 

[Stihl 041S]

Now THIS is a boring bar holder:

This is a clever design:

It is 3" diameter 8 1/2 pounds and the tool height is 1.450" so far too large for my lathe. My tool height is 1" exactly and the compound is 2.35" across. Ssssoooo...I think I can copy this one easily enough out of 4140 annealed? Boring bar holes are 3/4", 5/8" and 1/2".

Cut the bottom off till it is the right height.


Bingo!!! Bar on center. And rigid!!

No compound toolholder flex.

One can be made using drills and endmills in the chuck.

 

[Tzed250]

My instructor used to talk about the trepanning work he did. As in 10" diameter cores from a 14" shaft. He was an old timer from Special Metals in Huntington, WV. SM is what became of International Nickel / Inco Alloys. For most those names mean nothing, but as the worlds leader in high nickel alloy steel I can say for sure the developments made by that company have affected most Americans lives. Inconel was developed in that facility and is still one of the finest heat resistant alloys made. The metal finds uses in the extreme environment of aviation powerplants where it is used for the blades in turbojet engines. Our class was allowed a tour of the operation. I saw things happen in there that description would not do justce. Had to be seen to be believed. Good stuff.

 

[nmurph]

Bacon vodka......

It's better to have a bottle in front of me than a frontal lobotomy.

 

[Stihl 041S]

Inconel 600 (200) near pure nickel. Used for HT ovens and vacuum furnaces.

Inconel X-750. 50RC at 50% cold work and headed and machined wonderfully.

Inconel MADE the aircraft industry.

I would love to tour that plant.

 

[parrisw]

Just wanted to report, finally got to try out my new homemade HD boring bar, works really great, no chatter like before with the tiny one I had, tested it out today on a 7900 cyl.

 

[Dan_IN_MN]

Trepanning

Had to look it up....


<iframe width="560" height="315" src="http://www.youtube.com/embed/6HfkcqRe5xk" frameborder="0" allowfullscreen></iframe>

 

[Stihl 041S]

Had to look it up....


<iframe width="560" height="315" src="http://www.youtube.com/embed/6HfkcqRe5xk" frameborder="0" allowfullscreen></iframe>

Great video!

Now think 13" OD of hole, 10" OD of slug, 50' depth.


4 1/2 tons of chips.
Making a 6 1/2 ton piece of "scrap" in the middle.