#11
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milling machine
On 3/18/2018 7:08 PM, John B. wrote:
On Mon, 19 Mar 2018 00:35:20 +0100, Emanuel Berg wrote: What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE The beginning scenes - no loose clothing, no rings or wris****ch, etc. is good advice. I once worked with a guy that caught a ring on something when he jumped down out of the bomb bay and tore the skin off the back of his finger. Just pealed off a strip all the way from the base of his finger to the fingernail. An Electrician, working on the same airplane shorted out the main battery bank with his wedding ring. Melted the gold ring right off his finger (that didn't do the finger any good either) As a young Airman those experiences convinced me that jewelry and working are a poor combination and even today I automatically remove rings and watches when going to work. South Bend Lathe manual, 1914, inside back cover, "Before starting to work on a lathe, roll up your sleeves and remove your necktie." -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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#12
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milling machine
On Monday, March 19, 2018 at 10:53:04 AM UTC-4, AMuzi wrote:
South Bend Lathe manual, 1914, inside back cover, "Before starting to work on a lathe, roll up your sleeves and remove your necktie." From back in the days when machinists wore neckties! They were classier back then. They probably didn't wear eye protection in 1914 either. Yep, googling yields https://www.umassd.edu/about/historyofumassdartmouth/ Things have gotten much safer since then, of course. Safety inflation is real, and obviously not bad up to a point. I taught an intro to machine shop lab (just bare basics) and would come down very hard on a student who omitted eye protection. But I know the full-time machinist in that lab sometimes worked without eye protection, just as I sometimes do on my basement lathe. It's a risk we take based on our judgment of the circumstances. OTOH, I don't think I've ever obeyed the "Never use without eye protection!" warnings that seem to come on things like Harbor Freight screwdrivers. That company probably puts warnings on its rubber erasers. Kind of like this: https://www.youtube.com/watch?v=7gzDC-2ZO8I I put plastic hats in the same category. - Frank Krygowski |
#13
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milling machine
Jeff Liebermann wrote:
What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE A good choice for doing what? In another thread was the question, how do they cut aluminium tubes so that they fit together before welding, e.g. the top and down tube to the head tube? And the answer is a milling machine (and not a press drill). I'm sure the Luna is a good choice for "doing it" only the person who has to pay for it might disagree -- underground experts united http://user.it.uu.se/~embe8573 |
#14
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milling machine
On Mon, 19 Mar 2018 14:13:04 +0700, John B.
wrote: To be honest I can't think of anything I ever did on a horizontal or vertical milling machine that would have benefited by having CNC :-) A lathe, yes, if only turning the balls to put on the ends of a vise handle, but all the milling I can remember doing was pretty much straight cuts. What does the guy plan on doing with the mill? Small production runs. He's the retired owner of Santa Cruz Precision: http://santacruzprecision.com Some of the machines from the old business are now in his garage. Most of the stuff he did was designed on a computah using and old version of SmartCAM. http://www.smartcamcnc.com Some of the complex shapes could not have easily been done without the computer. Same with making multiple parts for short run manufacture. What inspired this project is that he's getting requests for quotes from former customers where the profits from 1 or 2 jobs would easily pay for the CNC conversion. Since the old Bandit CNC controller was almost dead, it seemed like a good way to go. Right now, we're a bit stalled due to various personal commitments. More on the mill: http://www.buildyouridea.com/cnc/Shizuoka/Shizuoka.html My payment for doing the computers, electrical and motors is that I get to use the mill to make custom knives. Something like this: https://www.youtube.com/watch?v=98ly5-1bhHU (0:00 to 4:30) -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#15
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milling machine
On Mon, 19 Mar 2018 19:47:27 +0100, Emanuel Berg
wrote: Jeff Liebermann wrote: What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE A good choice for doing what? In another thread was the question, I don't read every thread. how do they cut aluminium tubes so that they fit together before welding, e.g. the top and down tube to the head tube? And the answer is a milling machine (and not a press drill). It's called "mitering": https://www.google.com/search?q=mitering+bicycle+tubes A mill with an tiltable head is probably the easiest way to do it. I've watched the process, but have never done it myself. It can also be done with a lathe. I don't know if a drill press will work, probably not. Forget about using a tubing notcher. If the metal is soft enough for a notcher to work, then it's not strong enough to ride. I'm sure the Luna is a good choice for "doing it" only the person who has to pay for it might disagree I don't know anything about Luna mills. Mitering bicycle tubes does not require fabulous precision. A Chinese benchtop mill could be used if you're cheap or desperate. The accuracy is mostly in the jigs and fixtures. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#16
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milling machine
On 3/19/2018 11:52 AM, Frank Krygowski wrote:
On Monday, March 19, 2018 at 10:53:04 AM UTC-4, AMuzi wrote: South Bend Lathe manual, 1914, inside back cover, "Before starting to work on a lathe, roll up your sleeves and remove your necktie." From back in the days when machinists wore neckties! They were classier back then. They probably didn't wear eye protection in 1914 either. Yep, googling yields https://www.umassd.edu/about/historyofumassdartmouth/ Things have gotten much safer since then, of course. Safety inflation is real, and obviously not bad up to a point. I taught an intro to machine shop lab (just bare basics) and would come down very hard on a student who omitted eye protection. But I know the full-time machinist in that lab sometimes worked without eye protection, just as I sometimes do on my basement lathe. It's a risk we take based on our judgment of the circumstances. OTOH, I don't think I've ever obeyed the "Never use without eye protection!" warnings that seem to come on things like Harbor Freight screwdrivers. That company probably puts warnings on its rubber erasers. Kind of like this: https://www.youtube.com/watch?v=7gzDC-2ZO8I I put plastic hats in the same category. The expression for that is 'beyond parody'[1]. Example: http://wordpress.rideapart.com/2018/...ury-reduction/ [1] this woman coined the phrase: http://www.1490wlfn.com/vicki_mckenna.html She's one of your people, Frank, but doesn't use her Polish name professionally. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#17
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milling machine
On 3/19/2018 1:47 PM, Emanuel Berg wrote:
Jeff Liebermann wrote: What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE A good choice for doing what? In another thread was the question, how do they cut aluminium tubes so that they fit together before welding, e.g. the top and down tube to the head tube? And the answer is a milling machine (and not a press drill). I'm sure the Luna is a good choice for "doing it" only the person who has to pay for it might disagree An easier question. Just ring up Andy Newlands: http://www.strawberrybicycle.com/gal...hetti&id=ML314 http://www.strawberrybicycle.com/gal...hetti&id=ML317 -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#18
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milling machine
On Mon, 19 Mar 2018 12:43:45 -0700, Jeff Liebermann
wrote: On Mon, 19 Mar 2018 19:47:27 +0100, Emanuel Berg wrote: Jeff Liebermann wrote: What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE A good choice for doing what? In another thread was the question, I don't read every thread. how do they cut aluminium tubes so that they fit together before welding, e.g. the top and down tube to the head tube? And the answer is a milling machine (and not a press drill). It's called "mitering": https://www.google.com/search?q=mitering+bicycle+tubes A mill with an tiltable head is probably the easiest way to do it. I've watched the process, but have never done it myself. It can also be done with a lathe. I don't know if a drill press will work, probably not. Forget about using a tubing notcher. If the metal is soft enough for a notcher to work, then it's not strong enough to ride. I'm sure the Luna is a good choice for "doing it" only the person who has to pay for it might disagree I don't know anything about Luna mills. Mitering bicycle tubes does not require fabulous precision. A Chinese benchtop mill could be used if you're cheap or desperate. The accuracy is mostly in the jigs and fixtures. A file is accurate enough :-) -- Cheers, John B. |
#19
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milling machine
On Mon, 19 Mar 2018 12:21:41 -0700, Jeff Liebermann
wrote: On Mon, 19 Mar 2018 14:13:04 +0700, John B. wrote: To be honest I can't think of anything I ever did on a horizontal or vertical milling machine that would have benefited by having CNC :-) A lathe, yes, if only turning the balls to put on the ends of a vise handle, but all the milling I can remember doing was pretty much straight cuts. What does the guy plan on doing with the mill? Small production runs. He's the retired owner of Santa Cruz Precision: http://santacruzprecision.com Some of the machines from the old business are now in his garage. Most of the stuff he did was designed on a computah using and old version of SmartCAM. http://www.smartcamcnc.com Some of the complex shapes could not have easily been done without the computer. Same with making multiple parts for short run manufacture. What inspired this project is that he's getting requests for quotes from former customers where the profits from 1 or 2 jobs would easily pay for the CNC conversion. Since the old Bandit CNC controller was almost dead, it seemed like a good way to go. Right now, we're a bit stalled due to various personal commitments. More on the mill: http://www.buildyouridea.com/cnc/Shizuoka/Shizuoka.html My payment for doing the computers, electrical and motors is that I get to use the mill to make custom knives. Something like this: https://www.youtube.com/watch?v=98ly5-1bhHU (0:00 to 4:30) I thought that you "knife guys" hand forged the blades. At least that was what Jesse Clift did when he made what was probably the original Bowie knife :-) -- Cheers, John B. |
#20
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milling machine
On 3/19/2018 8:09 PM, John B. wrote:
On Mon, 19 Mar 2018 12:43:45 -0700, Jeff Liebermann wrote: On Mon, 19 Mar 2018 19:47:27 +0100, Emanuel Berg wrote: Jeff Liebermann wrote: What do you think guys, maybe this one is a good choice? https://www.youtube.com/watch?v=jML8nVSntuE A good choice for doing what? In another thread was the question, I don't read every thread. how do they cut aluminium tubes so that they fit together before welding, e.g. the top and down tube to the head tube? And the answer is a milling machine (and not a press drill). It's called "mitering": https://www.google.com/search?q=mitering+bicycle+tubes A mill with an tiltable head is probably the easiest way to do it. I've watched the process, but have never done it myself. It can also be done with a lathe. I don't know if a drill press will work, probably not. Forget about using a tubing notcher. If the metal is soft enough for a notcher to work, then it's not strong enough to ride. I'm sure the Luna is a good choice for "doing it" only the person who has to pay for it might disagree I don't know anything about Luna mills. Mitering bicycle tubes does not require fabulous precision. A Chinese benchtop mill could be used if you're cheap or desperate. The accuracy is mostly in the jigs and fixtures. A file is accurate enough :-) +1 Since I'm in the 'no two alike' frame repair business, I can miter a top tube at both ends to length with a file faster than the setup on a general purpose mill. http://www.yellowjersey.org/gth8.jpg If you're making a lot of frames to the same geometry, a Marchetti & Lange machine is what you want, but that is not Mr Berg. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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