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Making Small Machines
How accurate of a machine can be made from wood? I am considering building a
small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... --A |
#2
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Making Small Machines
I have bought and have made animation stands with that kind of accuracy.
Material was 3: of mdf with 2 part resin between the layers. It makes for a very stable base. |
#3
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Making Small Machines
Take a look here... http://www.patwarner.com/routerfence.html and read the
tolerance Pat specs it at. I built the fence when it was featured in FWW two years ago and it's as accurate now as when I built it. So to answer your question - yes you can as long as you use the right materials and plan accordingly. Your design needs to include a zero reference capability in both the x and y axis. Even if you make it out of other materials you still need a calibration capability. Bob S. "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... --A |
#4
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Making Small Machines
You have to more clearly define the objectives. If the objective is to be
able to move this thing in precise .001 increments, then yes, it is easily done with wood (I could push a noodle that close). If your requirements include it being (and staying) flat and parallel to .001,, wood is not going to do it. If, when moving in X, motion has to be confined to the X axis only within .001, wood is not going to do it. Metal is your best bet. Even with metal, if you are using unmachined stock, it will not fit the requirements unless all you are looking for is linear positioning without regard to variations in other axis. without equipment that is not normally found in the home shop, just getting the slide surface parallel to the ways is going to be quite a trick. "Bob S." wrote in message ... Take a look here... http://www.patwarner.com/routerfence.html and read the tolerance Pat specs it at. I built the fence when it was featured in FWW two years ago and it's as accurate now as when I built it. So to answer your question - yes you can as long as you use the right materials and plan accordingly. Your design needs to include a zero reference capability in both the x and y axis. Even if you make it out of other materials you still need a calibration capability. Bob S. "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... --A |
#5
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Making Small Machines
Not off hand but the first thing I would try is Ebay. It's amazing what pops
up on there. "Absinthe" wrote in message s.com... In that case do you know where I could purchase inexpensively or salvage a small 3"x6" or so slide table component? Actually it really only needs about 2" movement in x and probably less than 1/2" movement in the y... --A "CW" wrote in message news:%4N2b.266474$o%2.121821@sccrnsc02... You have to more clearly define the objectives. If the objective is to be able to move this thing in precise .001 increments, then yes, it is easily done with wood (I could push a noodle that close). If your requirements include it being (and staying) flat and parallel to .001,, wood is not going to do it. If, when moving in X, motion has to be confined to the X axis only within .001, wood is not going to do it. Metal is your best bet. Even with metal, if you are using unmachined stock, it will not fit the requirements unless all you are looking for is linear positioning without regard to variations in other axis. without equipment that is not normally found in the home shop, just getting the slide surface parallel to the ways is going to be quite a trick. "Bob S." wrote in message ... Take a look here... http://www.patwarner.com/routerfence.html and read the tolerance Pat specs it at. I built the fence when it was featured in FWW two years ago and it's as accurate now as when I built it. So to answer your question - yes you can as long as you use the right materials and plan accordingly. Your design needs to include a zero reference capability in both the x and y axis. Even if you make it out of other materials you still need a calibration capability. Bob S. "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... --A |
#6
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Making Small Machines
The device you seem to want sounds like a slightly larger version of the
mechanical stage used on microscopes to position slides at very high magnification, such as 1000x. While I don't recall the exact parameters, I do know that it's possible to locate a single bacterium, remove the slide, do other things with the scope, then replace the slide and re-locate the same bug within seconds. To be fair, one usually reads the stage verniers relatively grossly and then homes in on the subject by using landmarks within the field of view, but a good mechanical stage is a fairly decent precision instrument. Other manipulators allow one to insert an extruded glass syringe into the middle of a single nerve cell - or an ovum. Good enough? If you need more range than one of these stages can provide, could you attach it to a moveable base that would allow you to position it grossly, lock it down, and then use the finer capabilities of the stage itself? http://www.greatscopes.com/acc.htm is just one location. They sell one for $39. I've never dealt with them, so this isn't an endorsement of the company, but Google "mechanical stage" and see for yourself what turns up. You can go all the way from this low-end device to spending beaucoup de bucks on a Zeiss. Also, don't overlook the used market. There are loads of companies selling relatively inexpensive high-end microscope products in outstanding condition that have been re-cycled, damaged in some way that won't matter to you, reconditioned, upgraded, etc. DanD "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... |
#7
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Making Small Machines
Ernie Jurick wrote:
saber saw, a pop rivet gun and a set of vernier screws from Edmund What's a "vernier" screw? Sounds like what I could have used. I tried to build a... um? A focusing rail? A flummy to mount on my tripod to let me slide my whole camera forward and back in teeensy increments, in order to focus one of those macro/zoom combo thingies more easily. I built it out of aluminum bits, pop rivets, and a couple of carriage bolts. It never did work to my satisfaction, and I've since recycled all the bits. I could still use one though. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17345 Approximate word count: 520350 http://www.geocities.com/Paris/Rue/5407/ |
#8
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Making Small Machines
"Absinthe" wrote in message ws.com...
In that case do you know where I could purchase inexpensively or salvage a small 3"x6" or so slide table component? Actually it really only needs about 2" movement in x and probably less than 1/2" movement in the y... --A "CW" wrote in message news:%4N2b.266474$o%2.121821@sccrnsc02... You have to more clearly define the objectives. If the objective is to be able to move this thing in precise .001 increments, then yes, it is easily done with wood (I could push a noodle that close). If your requirements include it being (and staying) flat and parallel to .001,, wood is not going to do it. If, when moving in X, motion has to be confined to the X axis only within .001, wood is not going to do it. Metal is your best bet. Even with metal, if you are using unmachined stock, it will not fit the requirements unless all you are looking for is linear positioning without regard to variations in other axis. without equipment that is not normally found in the home shop, just getting the slide surface parallel to the ways is going to be quite a trick. "Bob S." wrote in message ... Take a look here... http://www.patwarner.com/routerfence.html and read the tolerance Pat specs it at. I built the fence when it was featured in FWW two years ago and it's as accurate now as when I built it. So to answer your question - yes you can as long as you use the right materials and plan accordingly. Your design needs to include a zero reference capability in both the x and y axis. Even if you make it out of other materials you still need a calibration capability. Bob S. "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... --A Velmex makes good slides that are inexpensive (that's relative) and functional. You can buy various configurations and there are a lot of selections and engineering tools on their site. Try this and see if it will fit your needs: http://www.velmex.com/manual_cross_s...sp?series=1500 Good Luck, Phil |
#9
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Making Small Machines
Why don't you say exactly what it is you are trying to do. It would be a lot
easier to come up with something that way. If you are going to use it for grinding, your requirements are different. It needs to be a shielded or sealed unit for that use. An open way type device will wear out in no time. "Absinthe" wrote in message s.com... It is always great to know what something is called. Much easier to find. I am curious, if you know how much physical stress one of these things could take. I am looking to hold a small devise to a cutter/grinder at precision up to .001. I fear the slide holder would not be strong enough for that. I can certainly look for a used one, perhaps I can find a microscope with one already attached that someone knocked off the table Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... -- A "Dan Dresner" wrote in message news:jHP2b.201954$cF.66457@rwcrnsc53... The device you seem to want sounds like a slightly larger version of the mechanical stage used on microscopes to position slides at very high magnification, such as 1000x. While I don't recall the exact parameters, I do know that it's possible to locate a single bacterium, remove the slide, do other things with the scope, then replace the slide and re-locate the same bug within seconds. To be fair, one usually reads the stage verniers relatively grossly and then homes in on the subject by using landmarks within the field of view, but a good mechanical stage is a fairly decent precision instrument. Other manipulators allow one to insert an extruded glass syringe into the middle of a single nerve cell - or an ovum. Good enough? If you need more range than one of these stages can provide, could you attach it to a moveable base that would allow you to position it grossly, lock it down, and then use the finer capabilities of the stage itself? http://www.greatscopes.com/acc.htm is just one location. They sell one for $39. I've never dealt with them, so this isn't an endorsement of the company, but Google "mechanical stage" and see for yourself what turns up. You can go all the way from this low-end device to spending beaucoup de bucks on a Zeiss. Also, don't overlook the used market. There are loads of companies selling relatively inexpensive high-end microscope products in outstanding condition that have been re-cycled, damaged in some way that won't matter to you, reconditioned, upgraded, etc. DanD "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... |
#10
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Making Small Machines
"Absinthe" wrote in message s.com... It is always great to know what something is called. Much easier to find. I am curious, if you know how much physical stress one of these things could take. I am looking to hold a small devise to a cutter/grinder at precision up to .001. I fear the slide holder would not be strong enough for that. I can certainly look for a used one, perhaps I can find a microscope with one already attached that someone knocked off the table Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... -- A HF has one, as does grizzly. as to their accuracy, that's another story. "Dan Dresner" wrote in message news:jHP2b.201954$cF.66457@rwcrnsc53... The device you seem to want sounds like a slightly larger version of the mechanical stage used on microscopes to position slides at very high magnification, such as 1000x. While I don't recall the exact parameters, I do know that it's possible to locate a single bacterium, remove the slide, do other things with the scope, then replace the slide and re-locate the same bug within seconds. To be fair, one usually reads the stage verniers relatively grossly and then homes in on the subject by using landmarks within the field of view, but a good mechanical stage is a fairly decent precision instrument. Other manipulators allow one to insert an extruded glass syringe into the middle of a single nerve cell - or an ovum. Good enough? If you need more range than one of these stages can provide, could you attach it to a moveable base that would allow you to position it grossly, lock it down, and then use the finer capabilities of the stage itself? http://www.greatscopes.com/acc.htm is just one location. They sell one for $39. I've never dealt with them, so this isn't an endorsement of the company, but Google "mechanical stage" and see for yourself what turns up. You can go all the way from this low-end device to spending beaucoup de bucks on a Zeiss. Also, don't overlook the used market. There are loads of companies selling relatively inexpensive high-end microscope products in outstanding condition that have been re-cycled, damaged in some way that won't matter to you, reconditioned, upgraded, etc. DanD "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... |
#11
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Making Small Machines
At this point I am just trying to create a free moving x/y positionner, that
I can butt against a pair of micrometer heads, and feed an item held by a small vise into a rotating cutter. All I was asking was that if I made the slide-table aspect of this from wood or whatever, how accurate could I get and not be affected by the material. I am coming to believe that something like a steel dovetail way slide will be necessary, and that will make the whole idea cost prohibitive. Of course, I may be fine with a small milling table, but I am still looking at sources on those. If you are actually interested in the actual project, I will be happy to discuss it in email, as I am not sure it pertains to woodwork, especially if I don't use wood to make it -- A "CW" wrote in message news:J043b.276793$uu5.61956@sccrnsc04... Why don't you say exactly what it is you are trying to do. It would be a lot easier to come up with something that way. If you are going to use it for grinding, your requirements are different. It needs to be a shielded or sealed unit for that use. An open way type device will wear out in no time. "Absinthe" wrote in message s.com... It is always great to know what something is called. Much easier to find. I am curious, if you know how much physical stress one of these things could take. I am looking to hold a small devise to a cutter/grinder at precision up to .001. I fear the slide holder would not be strong enough for that. I can certainly look for a used one, perhaps I can find a microscope with one already attached that someone knocked off the table Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... -- A "Dan Dresner" wrote in message news:jHP2b.201954$cF.66457@rwcrnsc53... The device you seem to want sounds like a slightly larger version of the mechanical stage used on microscopes to position slides at very high magnification, such as 1000x. While I don't recall the exact parameters, I do know that it's possible to locate a single bacterium, remove the slide, do other things with the scope, then replace the slide and re-locate the same bug within seconds. To be fair, one usually reads the stage verniers relatively grossly and then homes in on the subject by using landmarks within the field of view, but a good mechanical stage is a fairly decent precision instrument. Other manipulators allow one to insert an extruded glass syringe into the middle of a single nerve cell - or an ovum. Good enough? If you need more range than one of these stages can provide, could you attach it to a moveable base that would allow you to position it grossly, lock it down, and then use the finer capabilities of the stage itself? http://www.greatscopes.com/acc.htm is just one location. They sell one for $39. I've never dealt with them, so this isn't an endorsement of the company, but Google "mechanical stage" and see for yourself what turns up. You can go all the way from this low-end device to spending beaucoup de bucks on a Zeiss. Also, don't overlook the used market. There are loads of companies selling relatively inexpensive high-end microscope products in outstanding condition that have been re-cycled, damaged in some way that won't matter to you, reconditioned, upgraded, etc. DanD "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... |
#12
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Making Small Machines
Thanks, I see grizzly's but the only thing I come up with at HF is the cross
slide vise. I will have to see what the precision is, and how easily I can remove the vise "Charlie Spitzer" wrote in message ... "Absinthe" wrote in message s.com... It is always great to know what something is called. Much easier to find. I am curious, if you know how much physical stress one of these things could take. I am looking to hold a small devise to a cutter/grinder at precision up to .001. I fear the slide holder would not be strong enough for that. I can certainly look for a used one, perhaps I can find a microscope with one already attached that someone knocked off the table Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... -- A HF has one, as does grizzly. as to their accuracy, that's another story. "Dan Dresner" wrote in message news:jHP2b.201954$cF.66457@rwcrnsc53... The device you seem to want sounds like a slightly larger version of the mechanical stage used on microscopes to position slides at very high magnification, such as 1000x. While I don't recall the exact parameters, I do know that it's possible to locate a single bacterium, remove the slide, do other things with the scope, then replace the slide and re-locate the same bug within seconds. To be fair, one usually reads the stage verniers relatively grossly and then homes in on the subject by using landmarks within the field of view, but a good mechanical stage is a fairly decent precision instrument. Other manipulators allow one to insert an extruded glass syringe into the middle of a single nerve cell - or an ovum. Good enough? If you need more range than one of these stages can provide, could you attach it to a moveable base that would allow you to position it grossly, lock it down, and then use the finer capabilities of the stage itself? http://www.greatscopes.com/acc.htm is just one location. They sell one for $39. I've never dealt with them, so this isn't an endorsement of the company, but Google "mechanical stage" and see for yourself what turns up. You can go all the way from this low-end device to spending beaucoup de bucks on a Zeiss. Also, don't overlook the used market. There are loads of companies selling relatively inexpensive high-end microscope products in outstanding condition that have been re-cycled, damaged in some way that won't matter to you, reconditioned, upgraded, etc. DanD "Absinthe" wrote in message s.com... How accurate of a machine can be made from wood? I am considering building a small 3"x6" slide table (x/y positioning device) but ultimately it will have to be accurate to .001 so I am thinking I would be better off in some sort of plastic or metal... |
#13
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Making Small Machines
Dan --
I'm sorry, I really wasn't trying to be as vague as it seems. What I am attempting to do is an improvement on an existing product. It is a machine that is used to make keys from a brass blank with a steel cutter, by knowing the cut position and cut depth. Currently it works on the principle of a carriage that rides on a rod. It is stopped (for depths) by a micrometer in front of the carriage. It can be controlled laterally by rubbing it against a micrometer to one side set to the current position. It is fed into the cutter by a movement best described as an arc. I am trying to come up with a replacement for the carriage to 1. feed straight into the cutter instead of on the arc. 2. Make lateral positioning and forward movement more accurate and convenient. I am currently researching about 3 or 4 different methods of doing this, including stepper motors and actuators, dovetail way slides, milling tables, and a few really oddball ideas. At some point there is diminishing returns as this is approximately $300 machine (not really though) and the next better machine is about $1600. So as the costs rise to improve it, the benefits of doing so decease. -- Absinthe "Dan Dresner" wrote in message news:QX53b.210114$cF.67473@rwcrnsc53... I'm guessing now that a mechanical stage might not be the way to go since they are not made to take any thrust/twist, etc. Are you feeding the workpiece into a moving tool so that the feed screw will have to take all the thrust? or can you lock the workpiece down and feed the tool into it? Is the workpiece steel? wood? Jello? You would probably get better help from the community if you were more forthcoming about the details of your project. Another source just ocurred to me: a watchmaker's or tool and die-maker's supply catalog might turn up some very fine-threaded rod that you could incorporate into your design. DanD "Absinthe" wrote in message s.com... It is always great to know what something is called. Much easier to find. I am curious, if you know how much physical stress one of these things could take. I am looking to hold a small devise to a cutter/grinder at precision up to .001. I fear the slide holder would not be strong enough for that. I can certainly look for a used one, perhaps I can find a microscope with one already attached that someone knocked off the table Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... |
#14
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Making Small Machines
On Wed, 27 Aug 2003 08:26:32 -0700,"Absinthe"
wrote in message ws.com... Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... Harbor Freight cross-slide vise 4x7" travel, $25, Table play guaranteed to be less than 3/16"...once it's fine-tuned. - - Let Exxon send their own troops - ------------------------------------------------------- http://diversify.com Comprehensive Website Programming |
#15
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Making Small Machines
Are you familiar with Grainger?
http://www.grainger.com/Grainger/wwg/start.shtml Or Reid? http://www.reidtool.com/ Between the two of them, I'll bet you can find something that will work for you. They are the tinkerer's F.A.O. Schwarz.... DanD "Absinthe" wrote in message s.com... Dan -- I'm sorry, I really wasn't trying to be as vague as it seems. What I am attempting to do is an improvement on an existing product. It is a machine that is used to make keys from a brass blank with a steel cutter, by knowing the cut position and cut depth. Currently it works on the principle of a carriage that rides on a rod. It is stopped (for depths) by a micrometer in front of the carriage. It can be controlled laterally by rubbing it against a micrometer to one side set to the current position. It is fed into the cutter by a movement best described as an arc. I am trying to come up with a replacement for the carriage to 1. feed straight into the cutter instead of on the arc. 2. Make lateral positioning and forward movement more accurate and convenient. I am currently researching about 3 or 4 different methods of doing this, including stepper motors and actuators, dovetail way slides, milling tables, and a few really oddball ideas. At some point there is diminishing returns as this is approximately $300 machine (not really though) and the next better machine is about $1600. So as the costs rise to improve it, the benefits of doing so decease. -- Absinthe |
#16
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Making Small Machines
"Larry Jaques" wrote in message ... On Wed, 27 Aug 2003 08:26:32 -0700,"Absinthe" wrote in message ws.com... Though I think I am going to actually need a manual x/y slide-table. Someone must make a small inexpensive one for the hobbyist for small drill press milling... Harbor Freight cross-slide vise 4x7" travel, $25, Table play guaranteed to be less than 3/16"...once it's fine-tuned. - - Let Exxon send their own troops - They did.... |
#17
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Making Small Machines
Dan Dresner wrote:
Or Reid? http://www.reidtool.com/ "Over 1,000 different shapes and types of Control Devices such as Handles, Knobs, Cranks and Hand Wheels." Can I borrow some money? I think I need to spend some time browsing here. -- Michael McIntyre ---- Silvan Linux fanatic, and certified Geek; registered Linux user #243621 Confirmed post number: 17410 Approximate word count: 522300 http://www.geocities.com/Paris/Rue/5407/ |
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