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Old 03-20-2010, 07:08 PM   #76
AC Swank
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Quote:
Originally Posted by Donkey Hotey
Aren't you missing a decimal place there?
You're right, I fat fingered it again. S/B 2.50375" or to round things out, 2.504".


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Old 03-21-2010, 12:53 AM   #77
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Four thousandths of interference? FOUR? In one INCH? Four tenths, maybe.
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Old 03-21-2010, 01:53 AM   #78
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Quote:
Originally Posted by Donkey Hotey
Four thousandths of interference? FOUR? In one INCH? Four tenths, maybe.
You don't know much about interference fits do you? If you read my first post is said .0015" per inch. A hole size of 2.50" should have a fit of .00375" or .004" rounded off.



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Old 03-21-2010, 05:19 AM   #79
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Quote:
Originally Posted by Donkey Hotey
Four thousandths of interference? FOUR? In one INCH? Four tenths, maybe.
thou per inch shrink is pretty normal. we've done more than that on a pretty regular basis. look it up in the big book.
it's not a bearing fit.
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Old 03-21-2010, 06:45 AM   #80
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Originally Posted by dagwood
. look it up in the big book.
do machinists still compare edition #'s like a badge of honor?
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Old 03-21-2010, 06:53 AM   #81
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Quote:
Originally Posted by Hodag
do machinists still compare edition #'s like a badge of honor?
not that i know of. mines a pretty dog eared #25 not that old.
the boss has a ratty leather#17
everything is pretty much the same. but on different page #'s
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Old 03-21-2010, 07:58 AM   #82
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I'm not buying four thousandths for an interference fit of a sleeve in a tiny cast cylinder. With that much interference, that thing is going to buckle before it goes into the hole. Maybe pins pressed into a plate, yeah, but not a hollow tube liner.
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Old 03-21-2010, 08:29 AM   #83
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Quote:
Originally Posted by Donkey Hotey
I'm not buying four thousandths for an interference fit of a sleeve in a tiny cast cylinder. With that much interference, that thing is going to buckle before it goes into the hole. Maybe pins pressed into a plate, yeah, but not a hollow tube liner.
it'll be fine. thats not even really that much. I sleeve an bush all the time. pretty standard. thou per inch+
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Old 03-21-2010, 09:39 AM   #84
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Quote:
Originally Posted by Donkey Hotey
I'm not buying four thousandths for an interference fit of a sleeve in a tiny cast cylinder. With that much interference, that thing is going to buckle before it goes into the hole. Maybe pins pressed into a plate, yeah, but not a hollow tube liner.
It's funny that this is where the discussion is heading.

The parts I made on Friday are .504" hollow nubs (technical term) going into a .500" hole. They're supposed to be "pen holders" in the base of the clock we're building for the rest of the semester.
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Old 03-21-2010, 11:07 AM   #85
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Quote:
Originally Posted by Donkey Hotey
I'm not buying four thousandths for an interference fit of a sleeve in a tiny cast cylinder. With that much interference, that thing is going to buckle before it goes into the hole. Maybe pins pressed into a plate, yeah, but not a hollow tube liner.
The sleeves just drop in if cooled for an hour in liquid oxygen. We do it all the time.


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Old 03-21-2010, 11:35 AM   #86
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How about a propeller for a freshman beannie for one of your classmates.
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Old 03-26-2010, 10:07 PM   #87
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OK, time to add the shiny pictures.

Quote:
Originally Posted by crazydrummerdude
Week 4: In lab this week, we did various forms of welding. Nothing too exciting or exotic. But, I did some oxy-acetylene welding for the first time. Easy stuff. I should do it more often. I got a video, if anyone's interested.


Quote:
Originally Posted by crazydrummerdude
Lab Week 9; 3-19-10. Finally started machining. I feel like the entire last month(?) was futile. I learned a lot in lecture, but in lab.. eh. Today was my day on the lathe, though. The teacher said this was the hardest part of this course. He scheduled two lab days for the lathe portion. I had it completed in about an hour. The teacher said my parts were "beautiful" and that I'm "on [my] way to an A." Very cool to hear. Pictures to come..


My nubs:





Quote:
Originally Posted by crazydrummerdude
Funny, I was just writing up my explosives engineering research project. I've got a whopping 3 pages so far.
..and I just finished and submitted it. Whew!

Week 10; 3-26-10. Used the horizontal mill to cut our base and face plate down to size.



Then, we used the bridgeport to put some holes in 'em.. and used the drill press to put some other holes in 'em. I'm ahead of schedule, and I was about to take my parts to the shaper when the teacher told me to call it a day; "You gotta have something to do for the rest of the semester.."
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Old 03-27-2010, 04:35 AM   #88
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Old 04-09-2010, 10:28 PM   #89
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Week 11: 4-9-10; Spring break was last week. Nothing got done. Today, in an effort to work ahead so that I can attend the advrider spring Old Skool rally on the 23/24/25 (?), I took my face plate to the shaper (cell phone pic):



(Quite a bit larger than the one I've got.)

Tapped the holes in it, and fancied up my face and base pieces on the vertical mill.



Well, dang. I worked too far ahead, and now I'm DONE machining for the semester.



I have nothing to do next week (the 16th). Maybe I can convince the teacher to let me play around with some scraps. All I have left to do is polish it up and submit the clock for grading.



This thread has been very, very good to me so far, and behind the scenes (in PM's) I've made some excellent friends.
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Old 04-09-2010, 11:01 PM   #90
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Quote:
Originally Posted by crazydrummerdude
I took my face plate to the shaper (cell phone pic):
THAT--is almost a complete wasted of time. I can't believe they're even bothering to show you a shaper. Seriously, shapers were hopelessly obsolete when I was taking machining classes back in 1983. No experience is a complete waste but, I'd put using a shaper up there along with a drafting instructor grading you on your use of a lettering guide and a t-square.

Did you hear that click? Dagwood just put me on ignore.

Disclaimer: I own an Atlas shaper but, I bought it because I thought it was a cool antique, not because I found it useful. It's never cut a single chip in my possession.
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