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#1
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Tue, 24 May 2016 12:37:50 -0700
"Bob La Londe" wrote: That would be nice, but the old ones are totally 100% unuesable. wonder if a small magnifying lens could be glued onto one not sure of there are any adhesives that dry clear and stay clear there are hemispherical lenses i guess the trick would be getting the proper magnification A flatbed CNC router large enough to handle sheet good will eliminate the need for a lot of things. It might not be as fast as a panel saw for ripping shelves out of plywood, but once you have it programmed plus it is probably safer you can do an entire sheet while you are on the other side of the shop sweeping up from your last project. I want one, but the metal one thing i wonder about is the depth of cut how to make sure the cut is clean through you would not want to cut into the table and how do you keep the material flat for large sheets |
#2
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Tue, 24 May 2016 16:44:24 -0700, Electric Comet
wrote: On Tue, 24 May 2016 12:37:50 -0700 "Bob La Londe" wrote: That would be nice, but the old ones are totally 100% unuesable. wonder if a small magnifying lens could be glued onto one not sure of there are any adhesives that dry clear and stay clear Sure there are. They're used in photography and in making touch screens (the "touch" part is a separate piece from the "screen" part). They're also used for cell phone protective glass sheets. there are hemispherical lenses I'd think you'd want a cylindrical lens. i guess the trick would be getting the proper magnification A flatbed CNC router large enough to handle sheet good will eliminate the need for a lot of things. It might not be as fast as a panel saw for ripping shelves out of plywood, but once you have it programmed plus it is probably safer you can do an entire sheet while you are on the other side of the shop sweeping up from your last project. I want one, but the metal one thing i wonder about is the depth of cut how to make sure the cut is clean through The same way you do it with a saw. you would not want to cut into the table and how do you keep the material flat for large sheets Sacrificial backer (someone here, I think it was Swingman, uses foam insulation sheets. A CNC machine should be able to cut precisely, so the backer will last a while. |
#3
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
"krw" wrote in message
... On Tue, 24 May 2016 16:44:24 -0700, Electric Comet wrote: On Tue, 24 May 2016 12:37:50 -0700 "Bob La Londe" wrote: That would be nice, but the old ones are totally 100% unuesable. wonder if a small magnifying lens could be glued onto one not sure of there are any adhesives that dry clear and stay clear Sure there are. They're used in photography and in making touch screens (the "touch" part is a separate piece from the "screen" part). They're also used for cell phone protective glass sheets. there are hemispherical lenses I'd think you'd want a cylindrical lens. i guess the trick would be getting the proper magnification A flatbed CNC router large enough to handle sheet good will eliminate the need for a lot of things. It might not be as fast as a panel saw for ripping shelves out of plywood, but once you have it programmed plus it is probably safer you can do an entire sheet while you are on the other side of the shop sweeping up from your last project. I want one, but the metal one thing i wonder about is the depth of cut how to make sure the cut is clean through The same way you do it with a saw. you would not want to cut into the table and how do you keep the material flat for large sheets Sacrificial backer (someone here, I think it was Swingman, uses foam insulation sheets. A CNC machine should be able to cut precisely, so the backer will last a while. One of the neatest tricks I've seen is to surface your sacrificial backer, and then use your tool height setter to set that as negative the nominal thickness of your sheet goods. Then you throw your stock on the table align it, and lock it down. This way you just scuff the back, regardless of the varying thickness of the sheet goods. If you are good at setup your sacrifical backer should last for hundreds of jobs. |
#4
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Tue, 24 May 2016 18:21:17 -0700
"Bob La Londe" wrote: One of the neatest tricks I've seen is to surface your sacrificial backer, and then use your tool height setter to set that as negative the nominal thickness of your sheet goods. Then you throw your stock on the table align it, and lock it down. This way you just scuff the back, regardless of the varying thickness of the sheet goods. If you are good at setup your sacrifical backer should last for hundreds of jobs. here is the problem that i imagine could be encountered you lay a 4x8 sheet down let us say it is 1/4 or 5/16 it does not lay perfectly flat so you get a different depth of cut over the area it seems to me you would need to have wheels on the cutter head that applied consistent downward force while cutting to provide even depth of cut and not cut into the sacrificial backer with thicker sheet goods i would not expect much warping over the 4x8 area but with thinner i would expect a problem maybe i misunderstand what you mean by lock down |
#5
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
"Electric Comet" wrote in message ... On Tue, 24 May 2016 18:21:17 -0700 "Bob La Londe" wrote: One of the neatest tricks I've seen is to surface your sacrificial backer, and then use your tool height setter to set that as negative the nominal thickness of your sheet goods. Then you throw your stock on the table align it, and lock it down. This way you just scuff the back, regardless of the varying thickness of the sheet goods. If you are good at setup your sacrifical backer should last for hundreds of jobs. here is the problem that i imagine could be encountered you lay a 4x8 sheet down let us say it is 1/4 or 5/16 it does not lay perfectly flat so you get a different depth of cut over the area it seems to me you would need to have wheels on the cutter head that applied consistent downward force while cutting to provide even depth of cut and not cut into the sacrificial backer with thicker sheet goods i would not expect much warping over the 4x8 area but with thinner i would expect a problem maybe i misunderstand what you mean by lock down Ok, first off if you are cutting through, which was the question then you don't give a flying rip about varying thickness of the sheet goods. You cut based on the surface of the table. Second if you don't lock it down in some fashion its not going to stay on the table. Third, if it was me I would "lock it down" with a vacuum table if I was doing a lot of sheet goods. Only small parts will go flying. Larger ones will remain in place just fine. |
#6
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Wed, 25 May 2016 10:51:57 -0700, Electric Comet
wrote: On Tue, 24 May 2016 18:21:17 -0700 "Bob La Londe" wrote: One of the neatest tricks I've seen is to surface your sacrificial backer, and then use your tool height setter to set that as negative the nominal thickness of your sheet goods. Then you throw your stock on the table align it, and lock it down. This way you just scuff the back, regardless of the varying thickness of the sheet goods. If you are good at setup your sacrifical backer should last for hundreds of jobs. here is the problem that i imagine could be encountered you lay a 4x8 sheet down let us say it is 1/4 or 5/16 it does not lay perfectly flat so you get a different depth of cut over the area You lay it on a table that is flat. If you're not cutting on a flat table, you're screwed before you start. it seems to me you would need to have wheels on the cutter head that applied consistent downward force while cutting to provide even depth of cut and not cut into the sacrificial backer See above. with thicker sheet goods i would not expect much warping over the 4x8 area but with thinner i would expect a problem Exactly the opposite. maybe i misunderstand what you mean by lock down |
#7
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Wed, 25 May 2016 11:42:24 -0700
"Bob La Londe" wrote: Ok, first off if you are cutting through, which was the question then you don't give a flying rip about varying thickness of the sheet goods. You cut based on the surface of the table. Second if you don't lock it down in some fashion its not going to stay on the table. Third, if it was me I would "lock it down" with a vacuum table if I was doing a lot of sheet goods. Only small parts will go flying. Larger ones will remain in place just fine. yes i understand the material has to be secured but that has to be at the perimeter of the material the vacuum table would do it for sheet material as you said so there is the answer have you done any research on the most bang for the buck for a cnc setup for wood being budget conscious i am interested in looking at solution |
#8
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
"Electric Comet" wrote in message
... On Wed, 25 May 2016 11:42:24 -0700 "Bob La Londe" wrote: Ok, first off if you are cutting through, which was the question then you don't give a flying rip about varying thickness of the sheet goods. You cut based on the surface of the table. Second if you don't lock it down in some fashion its not going to stay on the table. Third, if it was me I would "lock it down" with a vacuum table if I was doing a lot of sheet goods. Only small parts will go flying. Larger ones will remain in place just fine. yes i understand the material has to be secured but that has to be at the perimeter of the material the vacuum table would do it for sheet material as you said so there is the answer have you done any research on the most bang for the buck for a cnc setup for wood being budget conscious i am interested in looking at solution If you are up for builiding your own you can invest a little at a time by starting with one of Ahren Johnson's kits from www.cncrouterparts.com , but by the time you get done building the cost will be the same to build a solid heavy machine of decent quality, plus a lot of your time. There are noname Chinese Imports for around $4800 to $6800, but I have yet to talk to somebody who owns one. The most basic machine I would consider as decent will run from about $12.8K to $15K nearly complete. (may still need computer and control software) The really nice sheet goods size machines start at around $16k and go up. I'll probably go with the $12-13k range machine and build my own vacuum table when I am ready to add that machine to my arsenal. |
#9
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Thursday, May 26, 2016 at 1:45:51 PM UTC-4, Bob La Londe wrote:
"Electric Comet" wrote in message ... On Wed, 25 May 2016 11:42:24 -0700 "Bob La Londe" wrote: Ok, first off if you are cutting through, which was the question then you don't give a flying rip about varying thickness of the sheet goods. You cut based on the surface of the table. Second if you don't lock it down in some fashion its not going to stay on the table. Third, if it was me I would "lock it down" with a vacuum table if I was doing a lot of sheet goods. Only small parts will go flying. Larger ones will remain in place just fine. yes i understand the material has to be secured but that has to be at the perimeter of the material the vacuum table would do it for sheet material as you said so there is the answer have you done any research on the most bang for the buck for a cnc setup for wood being budget conscious i am interested in looking at solution If you are up for builiding your own you can invest a little at a time by starting with one of Ahren Johnson's kits from www.cncrouterparts.com , but by the time you get done building the cost will be the same to build a solid heavy machine of decent quality, plus a lot of your time. There are noname Chinese Imports for around $4800 to $6800, but I have yet to talk to somebody who owns one. The most basic machine I would consider as decent will run from about $12.8K to $15K nearly complete. (may still need computer and control software) The really nice sheet goods size machines start at around $16k and go up. I'll probably go with the $12-13k range machine and build my own vacuum table when I am ready to add that machine to my arsenal. I'm not positive, but I think I just heard EC hit the floor somewhere |
#10
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Thu, 26 May 2016 10:45:46 -0700
"Bob La Londe" wrote: If you are up for builiding your own you can invest a little at a time by starting with one of Ahren Johnson's kits from www.cncrouterparts.com , but by the time you get done building the cost will be the same to build a solid heavy machine of decent quality, plus a lot of your time. There are noname Chinese Imports i will probably do it myself but just wanted a starting point for inspiration there is a lot of opensource cnc stuff out there my big concern is getting caught up in putting one together and enjoying this fiddling around stage too much fwiw i would probably do 4x5 or something like that or some other optimal size that is less than 4x8 i have noticed some equipment sellers/makers have fewer conventional machine offerings and more cnc stuff |
#11
Posted to rec.woodworking
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Sorta Woodworking - New Sight Glasses for My Table Saw
On Thursday, May 26, 2016 at 2:21:51 PM UTC-5, Electric Comet wrote:
i will probably do it myself but just wanted a starting point for inspiration Maybe search the IRS (Industrial Recovery Service) auctions for a used pin router, to start with, if you want to play, first. Example: In York, Pa, the bidding for a few are $200-$500 at the moment. Lots 417, 422, 435: http://www.irsauctions.com/index_lot...&tot=&id=20325 Check the other listings for an auction near you. Sonny |
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