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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
Posted to rec.crafts.woodturning
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Wondering Why
I tend more towards turning smaller stuff, sometimes really
small stuff - maybe it's because the JET mini/midi isn't made for doing BIG stuff. My tool of choice is a curved edge skew either 1/2" or 3/4". Because I want to get into tight places - deep narrow V cut, small 5/8 spheres, a vertical wall that a sphere butts up against, I find the 30 degree interior angle of the skew limits what I want to do. So I sometime get one of my bench chisels and with it's single bevel, I can make the cut I want. Should probably just break down and get a bedan. But it got me asking "Why can't the interior angle go to 20 degrees?" If the 30 degree interior angle is a general purpose angle and erring on the size of caution when it comes to the size of the chunk of wood, why can a tighter angle be used for smaller stuff. For a given rpm, the force on the edge goes up with the diameter AND the mass of the rotating piece of wood. And with smaller turnings you start with smaller square blanks rather than a very asymetric tree trunk with knots, some not apparent 'til you get into it a bit. With a sqaure blank the edge is initially contacting wood 4 times per revolution whereas with a "tree trunk" type of starting point, it may only contact the wood once per revolution. So what say you regarding a 20 degree interior angle on a 1/2" skew? Good idea? Bad idea? Something to try - taking some extra safety precautions (face shield, mouth piece, chest protector - cup - and a phone handy with 911 on speed dial)? charlie b who sometimes spends too much time wondering and not enough time on The Wood |
#2
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Wondering Why
"charlieb" wrote: (clip) I sometime get one of my bench chisels and with it's single bevel, I can make the cut I want. (clip) So what say you regarding a 20 degree interior angle on a 1/2" skew? (clip) ^^^^^^^^^^^^^^^^^ I say go for it. If a 20 degree angle does the trick when you are holding a chisel, the wood won't know the difference if you take away everything but the edge and substitute a skew. As a rule, using a narrower angle results in a sharper cutting edge. The only down side is that the edge is not as durable--wears faster and breaks easier. |
#3
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Wondering Why
Leo Lichtman wrote:
If a 20 degree angle does the trick when you are holding a chisel, the wood won't know the difference if you take away everything but the edge and substitute a skew. As a rule, using a narrower angle results in a sharper cutting edge. The only down side is that the edge is not as durable--wears faster and breaks easier. "Faster" and "easier" are relative terms. "Wear" should be a function of the feet per minute the edge experiences. Smaller diameter, fewer feet per minute, less wear, longer "edge life". As for breaking the edge - Ie - knocking off a chunk of it - is that really likely? charlie b |
#4
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Wondering Why
On Sat, 19 May 2007 22:36:53 -0700, charlieb
wrote: Leo Lichtman wrote: If a 20 degree angle does the trick when you are holding a chisel, the wood won't know the difference if you take away everything but the edge and substitute a skew. As a rule, using a narrower angle results in a sharper cutting edge. The only down side is that the edge is not as durable--wears faster and breaks easier. "Faster" and "easier" are relative terms. "Wear" should be a function of the feet per minute the edge experiences. Smaller diameter, fewer feet per minute, less wear, longer "edge life". As for breaking the edge - Ie - knocking off a chunk of it - is that really likely? Whether or not it is likely is going to be a function of how hard the edge is- as a rule of thumb, the harder steel gets, the more brittle it becomes. If the material is malleable enough, it will not chip off, but you do risk folding it. The skew should already be tempered enough to keep it from snapping off on you. The other concern is heat- a thinner edge will friction heat much more quickly than one with more material behind it. While it is not likely to be much of a problem, it is possible to get the end of a tool tip hot enough to draw the temper from a chisel when turning- making the angle more acute makes this more likely. I've got a few things cherry-red when turning, but they were not suitable cutting materials (EMT comes to mind) that I've used to "prototype" different things before spending time making them out of good steel, and I was really hogging with them. Those two things aside, I would not hesitate to try this out if I needed a skew that could do what you are describing. The difference in material is an issue, but probably not enough to outweigh the benefits of having the right tool for the job. Another option to consider is dedicating a couple of skews to this task, and grinding past the double bevel and starting fresh with a single bevel- this would let you get in those tight corners without making the angle steeper, but you would need two skews (a right hand and a left hand) to do the job. A quick search will turn up these profiles easily. Another thing to keep in mind is that very little in the world is truly revolutionary- while we may now have gouges made of M2 and powdered metal, the odds that the tools have been radically redesigned to take advantage of the new material specs is fairly low. For most applications, engineering and design is built off what has come before it, and not that much effort is expended in pushing the newer materials to their limits (especially in something as apparently simple as a gouge or skew) They will stress-test the new product to make sure it does not fail in normal use, but it's unlikely any of the manufacturers did much as far as varying angles goes- especially considering that the end product will be ground over and over by the user. What may be pushing the limits for an old carbon steel gouge is likely to be nothing to a tool steel. Give it a try- the worst thing that could happen is that you lose a piece, and need to regrind your skew. I would not seriously worry about a chunk of sharp metal flying off at you unless you hit a bit of hardened steel embedded in the wood- and you'd still need to worry about that with a regular grind on the tool. Most likely failure is that it will dull quickly or the cutting edge will bend. Neither one is the end of the world. |
#5
Posted to rec.crafts.woodturning
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Wondering Why
"charlieb" wrote in message ... I tend more towards turning smaller stuff, sometimes really small stuff - maybe it's because the JET mini/midi isn't made for doing BIG stuff. My tool of choice is a curved edge skew either 1/2" or 3/4". Because I want to get into tight places - deep narrow V cut, small 5/8 spheres, a vertical wall that a sphere butts up against, I find the 30 degree interior angle of the skew limits what I want to do. So I sometime get one of my bench chisels and with it's single bevel, I can make the cut I want. Should probably just break down and get a bedan. Bedans are fairly thick in section, IIRC. Sort of like mortising chisels. Longer bevel to guide for a greater included angle. I took the pointed scraper from my first turning set and ground it as a chisel. With a 3/16 section and a nearly 2:1 length to thickness ratio on the bevel, planes like a champ, reaches in between close beads, and sizes tenons beautifully. Longer the bevel, grabbier it can be, so don't undersell the tool, handle it firmly. Turned a small project after dinner myself, and used the chisel for smoothing and beading. Ornament of spalted beech and cherry. Turned a 15 inch bowl in the wet morning, so the lathe went full spectrum. |
#6
Posted to rec.crafts.woodturning
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Wondering Why
"charlieb" wrote: "Faster" and "easier" are relative terms. "Wear" should be a function of the feet per minute the edge experiences. Smaller diameter, fewer feet per minute, less wear, longer "edge life". As for breaking the edge - Ie - knocking off a chunk of it - is that really likely? ^^^^^^^^^^^^^^^^^^ Charlie, did you notice that I was recommending that you DO try the narrower grind? I mentioned wear and durability as an afterthought, and I thought it was clear that I do not consider them serious side-effects. Of course I agree that wear is a function of surface speed. Are you familiar with the concept, "All other things being equal?" For the same surface speed, wear is faster for narrower tool angles. I am sure that with a narrower grind, you will be sharpening the tool oftener. |
#7
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Wondering Why
When I first started turning, many years ago, I purchased a lathe, but
had no tools. At that time, I still had a blacksmith shop and I made my first set of tools from old coiled springs. It had been many years since I took highschool woodworking and turned a lamp on the lathe. I couldn't remember exactly how the tools were ground. My first skew had only one bevel and a fairly sharp angle. It did what you describe quite well. Then someone told me it was ground wrong and I ruined it by making two bevels. It sort of became uncontrollable, until I finally learned how to use it properly. For the small things you are considering, a bevel angle of 20 degrees should work very well. If fact a skew with only one bevel should work well on small items. Fred Holder http://www.fholder.com On May 19, 7:43 pm, charlieb wrote: I tend more towards turning smaller stuff, sometimes really small stuff - maybe it's because the JET mini/midi isn't made for doing BIG stuff. My tool of choice is a curved edge skew either 1/2" or 3/4". Because I want to get into tight places - deep narrow V cut, small 5/8 spheres, a vertical wall that a sphere butts up against, I find the 30 degree interior angle of the skew limits what I want to do. So I sometime get one of my bench chisels and with it's single bevel, I can make the cut I want. Should probably just break down and get a bedan. But it got me asking "Why can't the interior angle go to 20 degrees?" If the 30 degree interior angle is a general purpose angle and erring on the size of caution when it comes to the size of the chunk of wood, why can a tighter angle be used for smaller stuff. For a given rpm, the force on the edge goes up with the diameter AND the mass of the rotating piece of wood. And with smaller turnings you start with smaller square blanks rather than a very asymetric tree trunk with knots, some not apparent 'til you get into it a bit. With a sqaure blank the edge is initially contacting wood 4 times per revolution whereas with a "tree trunk" type of starting point, it may only contact the wood once per revolution. So what say you regarding a 20 degree interior angle on a 1/2" skew? Good idea? Bad idea? Something to try - taking some extra safety precautions (face shield, mouth piece, chest protector - cup - and a phone handy with 911 on speed dial)? charlie b who sometimes spends too much time wondering and not enough time on The Wood |
#8
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Wondering Why
"Fred Holder" wrote: (clip) a skew with only one bevel should work well on small items. ^^^^^^^^^^^^^^^^^ Right. The only thing that changes between a single bevel and a double bevel* is the angle the tool handle makes to the lathe axis. *All other things being equal. |
#9
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Wondering Why
I'm confused, as usual. Ignoring the dictionary as we turners usually
do, if a skew has a single bevel, but it takes two surfaces to form an edge what is the 'other' surface called? Shaft, I suppose. Changing the tilt of the tool and its application, which becomes the slanted surface? Do they change names to protect the innocent? Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#10
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Wondering Why
"Prometheus" wrote in message ... The other concern is heat- a thinner edge will friction heat much more quickly than one with more material behind it. While it is not likely to be much of a problem, it is possible to get the end of a tool tip hot enough to draw the temper from a chisel when turning- making the angle more acute makes this more likely. This would not be a consideration if using HSS. |
#11
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Wondering Why
*All other things being equal. The one thing in my mind that should not be underestimated, is the limited heatsink capacity of a thin narrow edge, that in itself will decrease the steels durability, other than that, and a harder to control tool, I see no reason not to go for it. Have fun and take care Leo Van Der Loo |
#12
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Wondering Why
Gentlemen - I thank you. Having access to the knowledge and insights
you all have acquired, and readily share, continues to amaze me. I hope my responses to your replies wasn't taken as arguementative. I dilsike threads that devolve into spitting matches and thankfully they don't seem to happen in this group. So recapping what I've learned 1. toughness vs hardness balancing act you want an edge that can take impact while remaining sharp tough yields but won't break hard won't yield but will break tough dulls faster than hard 2. unlike their predecessor - carbon steel - high speed steel and its successors will hold an edge longer, won't loose their temper with the heat generated by wood turning, but require a bit more "meat" in terms of included angle to compensate for reduced toughness. 3. single bevel skews will get you into tighter places than a double bevel skew - but you need a "left" and "right" single bevel skew to do beads and the like. 4. "standard bevel angles" ARE NOT SACRED Item 3 is my paradox. I want to get into tight places. And I want to turn - dynamically - spontaneously - and that requires one tool that will "do it all". I don't want to have to stop to change tools and I don't want to have a bunch of tools under the lathe, buried in shavings. Of course there is no single turning tool that "does it all" - but for me - a curved edge skew comes darn close. I use it "long point" down or "long point" into a horizontal cut - most of the time. With it I can rough a square blank round, cut lines, V grooves, beads, a bead up against a vertical face, coves and even hollow with it. Fortunately, Item 4 is my way out of my skew dilema. So I'll regrind by 1/2" skew to maybe 25 degrees and if that works but not quite - then 20 degrees. But what about the other "standard angles" for other turning tools? How many of those are "tried and true" - for carbon steel tools - but aren't necessarily required for modern steels and steel treatments. Why is The Ellsworth Grind siginificant enough a change to the "tried and true" grind to warrant bearing his name? I understand why turning tool manufacturers stick with the default "tried and true" - consumers shy away from things that are too far away from that with which they are familair. And then there are The Lawyers. But woodturners are very creative lot - I can't think of another type of woodworking that has gone off in so many different directions - and has gone so far in a relatively short time. So why are we (I flatter myself by inclusion) saddle with tools that are based on a century old techology's constraints? OK - so there's "lasers" and carbide "insert tools" - but how about innovative improvements to existing tools? Let me use two woodworking hand tools companies - Lie Nielsen and Veritas. The former makes beautiful, very functional, hand planes - based on "tried and true" designs - but refined by the use of better materials and manufacturing tolerances. These planes are practically works of art - and they work very well. Their price tag however excludes most folks from owning - and benefitting - from their tools. Veritas on the other hand, comes at tool making from a different perspective. THEY look at a "tried and true" design and question everything about the design of the "tried and true" tool - both from a functional stand point as well as from a user's perspective. Not only are they concerned with what's happening "where the rubber meets the road" (at the interface between tool and wood), but also look at the other end of the tool - where the user meets the tool. It's the User that's high on their design criterial list. "How comfortable is the grip? How flexible is the grip? How can the set up be made easier and more precise?" And Veritas looks at common woodworking tools and comes up with innovative, yet simple improvements to "tried and true" tools - that are easily improved - if you start with considering what's needed and how the "tried and true" tool does what's needed. Example - a try square. Simple, straightforeward tool - a straight edge for marking a straight line and a square corner. Will tell you if the intersection of two faces are square or not and lets you mark ONE face. BUT - you often need to mark BOTH faces, carrying a line from Face One onto Face Two. Solution - the Veritas Saddle Square. Costs about the same but makes it easier and more accurate to do. So where's the turning tools "Veritas"? ramble mode off charlie b But it's that "standard 30 degree included angle" |
#13
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Wondering Why
"Fred Holder" wrote in message ups.com... When I first started turning, many years ago, I purchased a lathe, but had no tools. At that time, I still had a blacksmith shop and I made my first set of tools from old coiled springs. It had been many years since I took highschool woodworking and turned a lamp on the lathe. I couldn't remember exactly how the tools were ground. My first skew had only one bevel and a fairly sharp angle. It did what you describe quite well. Then someone told me it was ground wrong and I ruined it by making two bevels. It sort of became uncontrollable, until I finally learned how to use it properly. Used to sell left and right skews when I started turning. Traditional tool had that nice long bevel opposite the straight side. |
#14
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Wondering Why
"charlieb" wrote in message ... 3. single bevel skews will get you into tighter places than a double bevel skew - but you need a "left" and "right" single bevel skew to do beads and the like. 4. "standard bevel angles" ARE NOT SACRED Item 3 is my paradox. I want to get into tight places. And I want to turn - dynamically - spontaneously - and that requires one tool that will "do it all". Simple enough. Use what they used for centuries - a chisel. You can skew a perpendicular edge in the proper planing direction, and beads are cut with a flip. It's what I'm using. |
#15
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Wondering Why
Trusting that I won't get spit at here, I'll resume the ramble.
Could it be that in addition to the comfort of grandad's tools and the fear of lawyers, some 'tried and true' tool designs do not change as better materials become available because of rigidly dogmatic turning instructions that are repeated over and over in books, posts, demos, articles and club meetings. No doubt that in many turning shops turners are grinding, fabricating and successfully trying even truer tools and techniques that take advantage of newer materials. Could it be that most don't see the light of day and remain untried by most of us because their owner feared being scoffed at or ignored by an unelected hierarchy? I am not paranoid, but I am inconsistent, some say perverse. There may not be any unwritten rules propagated by an unelected hierarchy. Maybe every genuine improvement in tool design gets its day in court. That said, why am I thinking about posting an updated list of what I consider useless and unnecessary new tools and devices I find in catalogs? Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#16
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Wondering Why
On Sun, 20 May 2007 11:30:30 -0700, charlieb
wrote: 3. single bevel skews will get you into tighter places than a double bevel skew - but you need a "left" and "right" single bevel skew to do beads and the like. Item 3 is my paradox. I want to get into tight places. And I want to turn - dynamically - spontaneously - and that requires one tool that will "do it all". I don't want to have to stop to change tools and I don't want to have a bunch of tools under the lathe, buried in shavings. Of course there is no single turning tool that "does it all" - but for me - a curved edge skew comes darn close. I use it "long point" down or "long point" into a horizontal cut - most of the time. With it I can rough a square blank round, cut lines, V grooves, beads, a bead up against a vertical face, coves and even hollow with it. One of my homemade goofing off tools is actually pretty good at this, but it is more of a scraper than a skew. If you've got any drill rod or spring steel laying around, try just grinding a steep "V" shape on the end, with the sides angled back from the top a little, and flatten the top. You can do all sorts of things with the sucker- I like it for hollowing, but I just finished using it to repair a cymbal for a guy at work who plays the drums in his off hours- the point worked great for cutting through bronze like it was nothing on my lathe. (The edge of the thing had cracked, and was flapping around, so I just removed the damaged area for him on the lathe. I also hand hammered it to retune it, but that's another story.) But what about the other "standard angles" for other turning tools? How many of those are "tried and true" - for carbon steel tools - but aren't necessarily required for modern steels and steel treatments. No idea, it was just idle speculation based on what I've seen from a lot of years in manufacturing. To tell you the truth, it's been so long since I bought a turning tool, I couldn't even begin to tell you what the standard angles are!!! Why is The Ellsworth Grind siginificant enough a change to the "tried and true" grind to warrant bearing his name? I understand why turning tool manufacturers stick with the default "tried and true" - consumers shy away from things that are too far away from that with which they are familair. And then there are The Lawyers. There is also the matter of adjusting the machines for different grinds- if you know that the customer is going to be changing it (intentionally or otherwise) at home, there's not much incentive to change the setup. But woodturners are very creative lot - I can't think of another type of woodworking that has gone off in so many different directions - and has gone so far in a relatively short time. So why are we (I flatter myself by inclusion) saddle with tools that are based on a century old techology's constraints? OK - so there's "lasers" and carbide "insert tools" - but how about innovative improvements to existing tools? There's the beauty of this *problem*. You already have everything you need to make whatever you want to try out- a grinder to make the profile, a lathe to make the handle, and some experience to guide you in the right direction. If you can forget about shiny, and worrying about whether or not your edge lasts as long as the guy next door's, you can have every tool you'll ever need right next to the lathe. If only everything were that easy! A guy can't really just jump in and make himself a decent table saw with a couple of hand tools and an hour or two of spare time (Though that is technically *possible*, depending on what you've got to start with, it's not likely.) But he sure can make a gouge or a skew that will do the job at hand admirably without really breaking a sweat. You may not want to submit a picture of the thing for publication when it's done, but if it cuts the wood, that's what is important. A couple of things I've discovered from screwing around with making turning tools- Even if you can't, or just don't want to heat treat steel of whatever grade, it's still steel, and the wood is still wood. You're not getting all you could out of it, but even 1018 mild steel from the hardware store is capable of cutting wood, provided you touch up the edge frequently. No- it's certainly *not* the same as a really nice $200 gouge, but if you need a tool, and don't have $200, it's not a bad option at the end of the day! Heat treating is important for the long haul, but you can get the job done in the short term with all sorts of crazy stuff. While it's not exactly the same profile as a *insert your brand here*, a piece of black iron pipe cut at a 45 degree angle on one end, and sharpened like a gouge, *is* a gouge. It's not very hard, and it won't hold an edge long, but it'll get you where you need to go. Aside from the material that is unsuitable for cutting tools, like those above, there is all sorts of scrap material that *is* worthwhile. If you have a grinder, you can put an edge on it. If you have a torch and a bucket of water, you can harden it. If you have an anvil and a brazing torch or a small forge (some are just one hollowed out fire brick and a propane torch), you can forge it to shape. Here's the short list of things to watch for that I've come up with, though I admit that I generally just buy new tool steel when I want something that I expect to last. Old Files- grind them carefully to preserve the temper, and they're good to go. If you want to hammer them, they have to be worked really hot, or they will crack. Truck axles- Lots of grinding here, if you got that route, but if you can hammer them out, that's a lot of tools. Spring steel- either from a leaf spring on an old car, or just a big spring. In the latter case, you'll need to heat it with a torch or forge to straighten it. You don't need an anvil to do this if you have a vise and slip a pipe on one end of the spring to untwist it once it's hot. Busted drill bits- The straight shank on the end is not too tough to fit into a wooden handle, and it's already hardened and tempered. Used machine shop tooling- I've got a bucket of old punches, but anything that contacts the material being worked is likely to be hard enough to make a great cutting tool. I don't know how easy it is for most folks to get this, but if you are, or know, a machinist, it's worth looking in the trash and scrap bins every so often. I keep hoping they'll decide to toss the old brake dies at work one of these days, but I'm not holding my breath... When in doubt, a good way to test for general suitability as a cutting tool is to take something that you know is hardened, like a punch or chisel, and *ring* the material in question. If it sounds like a bell, it'll make a good tool- if it sounds like you just whacked a hunk of lead with a 2 x 4, it's probably not worth your time. Unfortunately, with the hordes of lawyers everywhere, I don't think a guy can rummage around in a junkyard anymore these days- but there are still an awful lot of opportunities for salvaging tool or high-carbon steel if you keep your eyes open. It doesn't have to be big, either- all you need is something large enough to make the edge you want. Once you have that, you can mount it to something else, and you're good to go. |
#17
Posted to rec.crafts.woodturning
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Wondering Why
"Arch" wrote: (clip) Could it be that most don't see the light of day and remain untried by most of us because their owner feared being scoffed at or ignored by an unelected hierarchy? (clip) ^^^^^^^^^^^^^^^ Arch, I will wager that there are literally thousands of home made tools that work perfectly well, and don't match any standard design. Most turners are more interested in results, and couldn't be bothered publicizing or promoting a "design." They don't fear being ignored--they don't care. And, if you are being ignored, you can't be scoffed at. |
#18
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Wondering Why
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#19
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Wondering Why
"Prometheus" wrote: (clip) There are any number of things that get in the way of new ideas ever seeing the light of day- from poor communication, to simple turf protection. ^^^^^^^^^^^^^^^ It may not always be true, but it is true too much of the time. I understand the Japanese have it all over America on that score. Their management system encourages innovation and creative input from all levels in the production process. Top Ten List of ways to discourage innovation: 1.) "Don't come to me with a half-baked idea. Do your homework and don't come back until you have a proposal with all the details filled in. 2.) We don't have a problem. 3.) It's your idea--you do all the work. 4.) It's too expensive. 5.) You must not have enough to do, if you have time to come up with things like this. 6.) This is the way we have always done it. 7.) I didn't think of it. 8.) I'm smarter than you--who do you think you are? 9.) I'll get back to you--I'm busy right now. (Never does.) 10.) We're too busy to consider changing anything. |
#20
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Wondering Why
"Prometheus" wrote in message ... There are any number of things that get in the way of new ideas ever seeing the light of day- from poor communication, to simple turf protection. Nobody's supervisor wants to let a guy one step below them come up with a good idea unless they can take all or part of the credit for it- it's a somewhat misanthropic view, but it's true enough. It's no coincidence that the closest advisors to royalty in the turbulent middle ages were either physically or ecclesiastically eunuchs. That way they couldn't father a dynastic hopeful. In a bureaucracy position protection comes from employment of mental eunuchs. Anyone who puts a different angle on the grind or a longer/shorter fingernail is innovating, they're just letting someone else do the metallurgy and the handle. Tough part comes when they admit that they use a certain tool to do a job counter to convention masquerading as wisdom.... |
#21
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Wondering Why
Hi Leo,
11.) "That's a good idea, but the development costs and future sales don't meet our profit plan, but thanks for coming by". Only to see a variation marketed later. This happened to me (not in the turning business) and I started my own small R&D company: Medical Measurements. Soon found out that large manufacturers know that a patent is just a hunting license and is usually too expensive to defend. Sometimes it's better to join them than oppose them so my little company is long lost somewhere in Johnson & Johnson. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#22
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Wondering Why
Leo Lichtman wrote:
"Fred Holder" wrote: (clip) a skew with only one bevel should work well on small items. ^^^^^^^^^^^^^^^^^ Right. The only thing that changes between a single bevel and a double bevel* is the angle the tool handle makes to the lathe axis. *All other things being equal. Don't think so. Looking from above . . / \ vs /| / \ / | 30 degrees 15 Note that the single bevel will get into tighter spots (ie deeper cuts with steeper side walls) From the side they'd look identical - from one side +-+------------- +-+------------- \ \ \ \ +-+----------- +-+----------- but from the other side +-+------------- +-------------- \ \ \ +-+----------- +------------ charlie b |
#23
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Wondering Why
Arch wrote:
I'm confused, as usual. Ignoring the dictionary as we turners usually do, if a skew has a single bevel, but it takes two surfaces to form an edge what is the 'other' surface called? Shaft, I suppose. Changing the tilt of the tool and its application, which becomes the slanted surface? Do they change names to protect the innocent? Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings Well, With the Sorby Spindle Master it is an extension of the shaft with a highly polished bevel on one side. I have to admit I use mine a lot more than I use my skew for doing taper work and making well defined rounds with a good flat surface below it. But that's just my 2 cents worth, Mike Waiting to graduate from the first 20 year career and move onto the second. |
#24
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Wondering Why
"charlieb" wrote in message ... Leo Lichtman wrote: "Fred Holder" wrote: (clip) a skew with only one bevel should work well on small items. ^^^^^^^^^^^^^^^^^ Right. The only thing that changes between a single bevel and a double bevel* is the angle the tool handle makes to the lathe axis. *All other things being equal. Don't think so. Looking from above . . / \ vs /| / \ / | 30 degrees 15 ^^^^^^^^^^^^^^^^^^^ "Other things being equal" means the total included angle on both tools would be the same. |
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