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It is a bit ironic that my previous machining job required much greater precision and accuracy than my current one...and a good deal more thinking, also. Here we see the housing of an Allen-Bradley servomotor, affixed in an Andrychow lathe. Due to the odd shape of the housing, and the fact that it is made of aluminum, I couldn't close the lathe jaws directly around it; rather, I first needed to machine a mating flange into the aluminum disk seen behind it, then mark and drill bolt holes, and bolt the housing to the disk.
You can also see the dial indicator, pressing against the end of the part. In order to repair a worn bearing bore, it has to be opened up, a steel sleeve hammered in, and then the sleeve bored out to the original diameter. All the while, the bore and the new cuts must remain concentric with the mounting flange on the end of the housing, to within a thousandth of an inch, which is approximately one third the thickness of a sheet of paper.
The dial on the carriage of the lathe is set up to read the motion of the cross-slide, and is graduated in half-thousandths: Each notch on the dial indicates a thousandth in diameter, very convenient. The finish diameter for this work is actually measured in the thousandth of a millimeter (approximately 40 millionths of an inch), and is achieved by running a strip of sandpaper, held with the fingers, against the bearing bore while the part is spinning in the lathe.
I rather miss this job, but it was part-time, while I was in school, and I was laid off when the economic downturn came. Rather funny, really...the acceptable tolerances and finish at my current job would've gotten me fired at this one.
The phrase used as the title refers to the dial indicator: When you spin the part in the chuck, you don't want that needle to move. That's how you know you've got a good setup, concentric and flat.
Camera: Canon AE-1 Program (35mm SLR)
Lens: Aragon f2.8/28mm
Film: Kodak Professional E200 Ektachrome (ASA 200)
Exposure: 1 @ f22
Date: 28 December 2007
Negative WCGE-10
Scanned by Epson Perfection V500
Cropped and adjusted using Picnik.
Copyright MMVII Electro-Optical Division, Sylderon Machine Works."
Picture © Sylderon
Origonal Here http://www.furaffinity.net/full/7663403/
If you have pictures you would like to share, note us!
allowed us to share.Here is the original description.
"
It is a bit ironic that my previous machining job required much greater precision and accuracy than my current one...and a good deal more thinking, also. Here we see the housing of an Allen-Bradley servomotor, affixed in an Andrychow lathe. Due to the odd shape of the housing, and the fact that it is made of aluminum, I couldn't close the lathe jaws directly around it; rather, I first needed to machine a mating flange into the aluminum disk seen behind it, then mark and drill bolt holes, and bolt the housing to the disk.
You can also see the dial indicator, pressing against the end of the part. In order to repair a worn bearing bore, it has to be opened up, a steel sleeve hammered in, and then the sleeve bored out to the original diameter. All the while, the bore and the new cuts must remain concentric with the mounting flange on the end of the housing, to within a thousandth of an inch, which is approximately one third the thickness of a sheet of paper.
The dial on the carriage of the lathe is set up to read the motion of the cross-slide, and is graduated in half-thousandths: Each notch on the dial indicates a thousandth in diameter, very convenient. The finish diameter for this work is actually measured in the thousandth of a millimeter (approximately 40 millionths of an inch), and is achieved by running a strip of sandpaper, held with the fingers, against the bearing bore while the part is spinning in the lathe.
I rather miss this job, but it was part-time, while I was in school, and I was laid off when the economic downturn came. Rather funny, really...the acceptable tolerances and finish at my current job would've gotten me fired at this one.
The phrase used as the title refers to the dial indicator: When you spin the part in the chuck, you don't want that needle to move. That's how you know you've got a good setup, concentric and flat.
Camera: Canon AE-1 Program (35mm SLR)
Lens: Aragon f2.8/28mm
Film: Kodak Professional E200 Ektachrome (ASA 200)
Exposure: 1 @ f22
Date: 28 December 2007
Negative WCGE-10
Scanned by Epson Perfection V500
Cropped and adjusted using Picnik.
Copyright MMVII Electro-Optical Division, Sylderon Machine Works."
Picture ©
SylderonOrigonal Here http://www.furaffinity.net/full/7663403/
If you have pictures you would like to share, note us!
Category Photography / All
Species Unspecified / Any
Size 1280 x 863px
File Size 113 kB
It's kind of disappointing how little the public at large knows about machinists.
One of our class projects was to make a fly cutter, after having finished mine I took it home to show to some people I know and upon seeing it the conversation went like this:
"Oh wow, you made that?"
"Yes."
"How did you do it did you laser weld it?"
"...No, it was turned on a lathe."
To which I got a blank stare.
Nobody really seems to have any idea what the hell it is machinists actually do, I guess the upshot to that is I can gleefully make up whatever the hell I want an it's not as though anyone can tell the difference:
*while holding a telescoping gauge* "Yes, this is a flugel finder, used to determine the spherosity of hyper ferrous alloys..."
People have actually believed that...
One of our class projects was to make a fly cutter, after having finished mine I took it home to show to some people I know and upon seeing it the conversation went like this:
"Oh wow, you made that?"
"Yes."
"How did you do it did you laser weld it?"
"...No, it was turned on a lathe."
To which I got a blank stare.
Nobody really seems to have any idea what the hell it is machinists actually do, I guess the upshot to that is I can gleefully make up whatever the hell I want an it's not as though anyone can tell the difference:
*while holding a telescoping gauge* "Yes, this is a flugel finder, used to determine the spherosity of hyper ferrous alloys..."
People have actually believed that...
LASER WELDING!
Just last week I made a flycutter holder-arbor-thing with no angle to the tool bit, for cutting splines on axle shafts in the mill. Could also use it for a boring bar in the lathe with how long I cut the shank.
The joys of the home-shop, I use my flycutters for everything from those splines, to corner rounding, and dovetail cutting.
Just last week I made a flycutter holder-arbor-thing with no angle to the tool bit, for cutting splines on axle shafts in the mill. Could also use it for a boring bar in the lathe with how long I cut the shank.
The joys of the home-shop, I use my flycutters for everything from those splines, to corner rounding, and dovetail cutting.
Sadly I wasn't interested in metal when I was in school. I get the passion for metal when I was 21. Since then the machines keep coming and I keep learning it from the books.
The last thing I made http://www.furaffinity.net/view/7799888/
The last thing I made http://www.furaffinity.net/view/7799888/
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