|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
I have thought for a long time about being able
to make your own clamps, stays, and so on. That would be so sweet, as work then wouldn't have to come off on seemingly simple details that are nevertheless vital... Some should not be difficult at all to do if one possess the right material and tools. The piece that attach the lower part of the chain guard to the frame, for example (the top piece in the photo) - it shouldn't be too difficult to do! Incidentally, I used such I piece today doing a clamp to put the front reflex to the holder. First I drilled a 5 mm hole thru the reflex, then put an M5 bolt thru the reflex into a nylon nut on the other side. What do you think? I think it is possible to do and Joe Bike Rider won't ever tell the difference... Photo: http://user.it.uu.se/~embe8573/photos/reflex-clamp.jpg -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 55 Blogomatic articles - |
Ads |
#2
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sat, 25 Jun 2016 00:11:24 +0200, Emanuel Berg
wrote: I have thought for a long time about being able to make your own clamps, stays, and so on. That would be so sweet, as work then wouldn't have to come off on seemingly simple details that are nevertheless vital... Some should not be difficult at all to do if one possess the right material and tools. The piece that attach the lower part of the chain guard to the frame, for example (the top piece in the photo) - it shouldn't be too difficult to do! Incidentally, I used such I piece today doing a clamp to put the front reflex to the holder. First I drilled a 5 mm hole thru the reflex, then put an M5 bolt thru the reflex into a nylon nut on the other side. What do you think? I think it is possible to do and Joe Bike Rider won't ever tell the difference... Photo: http://user.it.uu.se/~embe8573/photos/reflex-clamp.jpg With practice you can make almost anything that you want to. The problem is in your skill level. I once had a German machinist working for me that had a little "jewel box" in the top tray of his tool box. One day I asked him what it was and he showed me. It was a cube of metal about 25mm on a side. He told me that it was one of the things he had to make to complete his apprenticeship in Germany. He said that it was accurate to 0.002mm in all directions. He made it using only hand tools. -- cheers, John B. |
#3
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
John B. writes:
Incidentally, I used such I piece today doing a clamp to put the front reflex to the holder. First I drilled a 5 mm hole thru the reflex, then put an M5 bolt thru the reflex into a nylon nut on the other side ... Photo: http://user.it.uu.se/~embe8573/photos/reflex-clamp.jpg With practice you can make almost anything that you want to. The problem is in your skill level. So I suppose you'd start with some metal sheet which is easy to cut and bend but still has some stiffness to to it. I have learned you can put a pipe into a vise and then hammer the piece around it to get an even, round shape. Folding can also be done in a vise but the corners often do not come out that sharp... Drilling an tapping, of course. I have learned you can drill thru a round, soft object (e.g. fenders) by putting it around around a tree object first, e.g. mallet, fasten with cord, and then put the mallet into the vise! I once had a German machinist working for me that had a little "jewel box" in the top tray of his tool box. One day I asked him what it was and he showed me. It was a cube of metal about 25mm on a side. He told me that it was one of the things he had to make to complete his apprenticeship in Germany. He said that it was accurate to 0.002mm in all directions. He made it using only hand tools. I know how to do that! You use a hacksaw, a metal file, a micrometer, and then a try square which you hold to the sun, and if it is correct, you won't see any light pass by! That should be pretty easy, right? -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 55 Blogomatic articles - |
#4
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sun, 26 Jun 2016 01:53:10 +0200, Emanuel Berg
wrote: John B. writes: Incidentally, I used such I piece today doing a clamp to put the front reflex to the holder. First I drilled a 5 mm hole thru the reflex, then put an M5 bolt thru the reflex into a nylon nut on the other side ... Photo: http://user.it.uu.se/~embe8573/photos/reflex-clamp.jpg With practice you can make almost anything that you want to. The problem is in your skill level. So I suppose you'd start with some metal sheet which is easy to cut and bend but still has some stiffness to to it. I have learned you can put a pipe into a vise and then hammer the piece around it to get an even, round shape. Folding can also be done in a vise but the corners often do not come out that sharp... Drilling an tapping, of course. I have learned you can drill thru a round, soft object (e.g. fenders) by putting it around around a tree object first, e.g. mallet, fasten with cord, and then put the mallet into the vise! I once had a German machinist working for me that had a little "jewel box" in the top tray of his tool box. One day I asked him what it was and he showed me. It was a cube of metal about 25mm on a side. He told me that it was one of the things he had to make to complete his apprenticeship in Germany. He said that it was accurate to 0.002mm in all directions. He made it using only hand tools. I know how to do that! You use a hacksaw, a metal file, a micrometer, and then a try square which you hold to the sun, and if it is correct, you won't see any light pass by! That should be pretty easy, right? Try it. Then come back and tell me how easy it is :-) Remember that since it is a cube all sides must be perfectly flat and at 90 degrees to any adjacent flat and that the dimensions between all sides must be the same, within 0.002mm. -- cheers, John B. |
#5
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sun, 26 Jun 2016 01:53:10 +0200, Emanuel Berg
wrote: John B. writes: Incidentally, I used such I piece today doing a clamp to put the front reflex to the holder. First I drilled a 5 mm hole thru the reflex, then put an M5 bolt thru the reflex into a nylon nut on the other side ... Photo: http://user.it.uu.se/~embe8573/photos/reflex-clamp.jpg With practice you can make almost anything that you want to. The problem is in your skill level. So I suppose you'd start with some metal sheet which is easy to cut and bend but still has some stiffness to to it. Actually it is best to start with material that you know will do the job and then figure out how to cut it :-) -- cheers, John B. |
#6
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
John B. writes:
Remember that since it is a cube all sides must be perfectly flat and at 90 degrees to any adjacent flat and that the dimensions between all sides must be the same, within 0.002mm. Yeah, but are there really "hand tools" that accurate? Or are you not supposed to measure the thing until final examination? -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 55 Blogomatic articles - |
#7
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sun, 26 Jun 2016 06:08:11 +0200, Emanuel Berg
wrote: John B. writes: Remember that since it is a cube all sides must be perfectly flat and at 90 degrees to any adjacent flat and that the dimensions between all sides must be the same, within 0.002mm. Yeah, but are there really "hand tools" that accurate? Or are you not supposed to measure the thing until final examination? This series of stories might help: http://www.practicalmachinist.com/vb/general/ot-old-german-toolmakers-160631/ I don't recall the required accuracy or exact procedure. Two of my uncles were machinists in Poland before WWII and had to pass a similar test. I vaguely recall that the original size of the block of metal was about 200 mm and that it took a week or more to complete. When I was about 17 years old, I arrogantly tried to duplicate the feat, thinking it was easy. I gave up after about 3 days of frustration. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#8
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
Jeff Liebermann writes:
I don't recall the required accuracy or exact procedure. Two of my uncles were machinists in Poland before WWII and had to pass a similar test. I vaguely recall that the original size of the block of metal was about 200 mm and that it took a week or more to complete. When I was about 17 years old, I arrogantly tried to duplicate the feat, thinking it was easy. I gave up after about 3 days of frustration. If the Germans used it as a test of skill, it sure as hell (Hel) cannot be easy. But I'm curious about the rules. What does "hand tools" mean? Is it tools you hold in your hand(s) or is it tools not fueled by an engine or power? Are you allowed to build your own tools and stands? -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 55 Blogomatic articles - |
#9
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sun, 26 Jun 2016 07:08:46 +0200, Emanuel Berg
wrote: Jeff Liebermann writes: I don't recall the required accuracy or exact procedure. Two of my uncles were machinists in Poland before WWII and had to pass a similar test. I vaguely recall that the original size of the block of metal was about 200 mm and that it took a week or more to complete. When I was about 17 years old, I arrogantly tried to duplicate the feat, thinking it was easy. I gave up after about 3 days of frustration. If the Germans used it as a test of skill, it sure as hell (Hel) cannot be easy. But I'm curious about the rules. What does "hand tools" mean? Is it tools you hold in your hand(s) or is it tools not fueled by an engine or power? Are you allowed to build your own tools and stands? Some of the stories under: http://www.practicalmachinist.com/vb/general/ot-old-german-toolmakers-160631/ (3 pages) explain the details and requirements. As might be expected, they vary. As I vaguely recall from 40 years ago, hand tools meant anything without a motor, belt, or drive, that could be wielded in one or both hands. No power tools. One of the stories in the above URL mentions, "There were a few files, a hammer, cape chisel, combination square & vernier caliper". A granite surface plate and dial indicator would have been nice, but I suspect they weren't available or allowed. However, even those would not be of any use until after the first surface of the cube is done and perfectly flat. This article offers some more detail: http://www.practicalmachinist.com/vb/general/ot-old-german-toolmakers-160631/index2.html#post920091 I don't know if one was allowed to build their own tools. Since the test was for beginning machinists, I would not expect them to have amassed much of a tool and instrument collection at that point. I recall my father mumbling something about using the stiction from a gauge block to check for flatness, but I'm not sure. I suspect a honing stone and abrasive were required to obtain this level of flatness. Also, I was wrong on the "week or more to complete". Apparently, it took much longer to make the cube perfect. The above article mentions 3 months. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#10
|
|||
|
|||
drill holes in reflexes, make clamps (photo)
On Sun, 26 Jun 2016 06:08:11 +0200, Emanuel Berg
wrote: John B. writes: Remember that since it is a cube all sides must be perfectly flat and at 90 degrees to any adjacent flat and that the dimensions between all sides must be the same, within 0.002mm. Yeah, but are there really "hand tools" that accurate? Or are you not supposed to measure the thing until final examination? I don't believe there is any rules about how or when to measure. But you will be judged on what you do :-) As for accurate. Well, when I was at the Air Force test center at Edwards AFB, I saw flat flanges used on the X1 or maybe 2, that were hand finished to a tolerance that with no gasket - a metal to metal flat flange joint - were used in a 3,000 PSI system flowing "red fuming nitric acid" used as an oxidizer for the rocket engine. -- cheers, John B. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
OT Torx drill bit | Judith[_4_] | UK | 56 | March 13th 12 08:25 AM |
##### Own the Track with Laser Sharp Reflexes ###### | [email protected] | Racing | 0 | November 15th 07 08:37 PM |
upload your photo and sell photo online | hiruma4 | Mountain Biking | 1 | August 24th 07 02:52 PM |
Improved reflexes from guni'ing? | David_Stone | Unicycling | 7 | July 29th 06 01:30 PM |
Drill holes in bike frame? | Pat | General | 11 | September 28th 04 01:36 PM |