Home |
Search |
Today's Posts |
|
Woodworking (rec.woodworking) Discussion forum covering all aspects of working with wood. All levels of expertise are encouraged to particiapte. |
Reply |
|
|
LinkBack | Thread Tools | Display Modes |
#41
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 2/26/2013 1:21 PM, Swingman wrote:
Just so happens I'm working on a chair reproduction as we speak where the side aprons are 13/16" thick ... the error from using the wrong face when installing the aprons is exactly 1/32" ... enough to cause a gap and reveal error on either the front or back leg. Case in point: Today, in order to get this: https://picasaweb.google.com/1113554...13230 7708194 https://picasaweb.google.com/1113554...54940 2609826 I had to measure, with the same precision as the drawing (1/32") thusly: https://picasaweb.google.com/1113554...87012 3088434 https://picasaweb.google.com/1113554...20626 5997442 (I use an Incra Rule and .05 Incra pencil lead when laying out to facilitate this) What it boils down to ... when you work from a precision drawing (Sketchup's precision, IIRC, is the same as AutoCad: 0.000001), you do yourself a big favor by trusting your model and using the actual dimensions of the drawing to the best of your ability. This will guarantee you that, if you take care in measurements and use the same resolution, you can accurately fabricate that model in real life, no matter how many you have to scale to fit a space. This may not seem like much, but put 12 cabinets side by side and expect everything to line up with precision and work out without a hitch, _in a space that did not even exist when you built the cabinets_ , you gotta learn to trust your tools. Even more important when you work with someone else and they use the same methods and sense of meticulous precision, but work in another location. Example: Leon built this cabinet, on less than 24 hours notice, in his shop, and from a drawing, and it fit in between two already installed components _precisely_ the next morning, I do mean precisely: https://picasaweb.google.com/1113554...5270069 82290 From this: https://picasaweb.google.com/1113554...77120382568930 (and yes, we calibrated/checked our table saw fence rulers about six years ago) And, I'm still impressed that by that feat ... -- eWoodShop: www.eWoodShop.com Wood Shop: www.e-WoodShop.net https://plus.google.com/114902129577517371552/posts http://www.custommade.com/by/ewoodshop/ KarlCaillouet@ (the obvious) |
#42
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
Swingman wrote in
: On 2/26/2013 1:21 PM, Swingman wrote: Just so happens I'm working on a chair reproduction as we speak where the side aprons are 13/16" thick ... the error from using the wrong face when installing the aprons is exactly 1/32" ... enough to cause a gap and reveal error on either the front or back leg. Case in point: Today, in order to get this: https://picasaweb.google.com/1113554...hopMissionChai rReproduction2013#5849359132307708194 https://picasaweb.google.com/1113554...hopMissionChai rReproduction2013#5849360549402609826 I had to measure, with the same precision as the drawing (1/32") thusly: https://picasaweb.google.com/1113554...hopMissionChai rReproduction2013#5849367870123088434 https://picasaweb.google.com/1113554...hopMissionChai rReproduction2013#5849363206265997442 (I use an Incra Rule and .05 Incra pencil lead when laying out to facilitate this) What it boils down to ... when you work from a precision drawing (Sketchup's precision, IIRC, is the same as AutoCad: 0.000001), you do yourself a big favor by trusting your model and using the actual dimensions of the drawing to the best of your ability. This will guarantee you that, if you take care in measurements and use the same resolution, you can accurately fabricate that model in real life, no matter how many you have to scale to fit a space. This may not seem like much, but put 12 cabinets side by side and expect everything to line up with precision and work out without a hitch, _in a space that did not even exist when you built the cabinets_ , you gotta learn to trust your tools. Even more important when you work with someone else and they use the same methods and sense of meticulous precision, but work in another location. Example: Leon built this cabinet, on less than 24 hours notice, in his shop, and from a drawing, and it fit in between two already installed components _precisely_ the next morning, I do mean precisely: https://picasaweb.google.com/1113554...hopEuropeanSty leKitchen201102#5679345527006982290 From this: https://picasaweb.google.com/1113554...hopJustStuff#5 849377120382568930 (and yes, we calibrated/checked our table saw fence rulers about six years ago) And, I'm still impressed that by that feat ... Wow ... -- Best regards Han email address is invalid |
#43
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 2/26/2013 3:35 PM, Swingman wrote:
Even more important when you work with someone else and they use the same methods and sense of meticulous precision Even more important when you work with someone else and they use the same methods and sense of meticulous precision Damn, I going to have to copy paste this in my note app on my phone so that I can sound more better when explaining things. ;~) A neighbor stopped by and was wondering how all this, computer to workshop, stuff worked, I summed up your phrase above by simply saying that it helps to be "AR". Thinking back to this morning when setting up a dado to within .005" of being 1/2" wide after adjusting the first trial cut. That is a precision that is approaching 5/1016". FWIW that is hard to see on the ruler. ;~) Thank goodness for electronic calipers. |
#44
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow)
In article om,
Lew Hodgett wrote: Lew Hodgett wrote: Actually it is 540 mm. ---------------------------------------- "Bill" wrote: No fair using your slide rule! ------------------------------------------ Lew Hodgett wrote: Still good to 3 decimel place accuracy. "Leon" wrote: If you enter the correct data. ----------------------------------------------- 21-3/32" = 21.09375" 1" = 25.6 mm 21.09375" x 25.6 mm/" = 540 mm. Nuf said. Lew Here on the East coast there are still 25.4 millimeters per inch. When did they change it in California? -- There is always an easy solution to every human problem -- neat, plausible, and wrong." (H L Mencken) Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org |
#46
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow)
In article ,
Edward A. Falk wrote: In article , Larry W wrote: Here on the East coast there are still 25.4 millimeters per inch. When did they change it in California? After the Loma Prieta quake. They didn't want to re-survey the 440 Freeway, so they came up with this compromise. A few good things that originated in California have worked their way across the country over the years. "Right turn on red after stopping" comes to mind. I hope this change to 25.6mm/inch does not make it! -- There is always an easy solution to every human problem -- neat, plausible, and wrong." (H L Mencken) Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org |
#47
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On Tue, 26 Feb 2013 15:35:24 -0600, Swingman wrote:
On 2/26/2013 1:21 PM, Swingman wrote: Just so happens I'm working on a chair reproduction as we speak where the side aprons are 13/16" thick ... the error from using the wrong face when installing the aprons is exactly 1/32" ... enough to cause a gap and reveal error on either the front or back leg. Case in point: Today, in order to get this: https://picasaweb.google.com/1113554...13230 7708194 https://picasaweb.google.com/1113554...54940 2609826 I had to measure, with the same precision as the drawing (1/32") thusly: https://picasaweb.google.com/1113554...87012 3088434 https://picasaweb.google.com/1113554...20626 5997442 (I use an Incra Rule and .05 Incra pencil lead when laying out to facilitate this) What it boils down to ... when you work from a precision drawing (Sketchup's precision, IIRC, is the same as AutoCad: 0.000001), you do yourself a big favor by trusting your model and using the actual dimensions of the drawing to the best of your ability. This will guarantee you that, if you take care in measurements and use the same resolution, you can accurately fabricate that model in real life, no matter how many you have to scale to fit a space. This may not seem like much, but put 12 cabinets side by side and expect everything to line up with precision and work out without a hitch, _in a space that did not even exist when you built the cabinets_ , you gotta learn to trust your tools. Even more important when you work with someone else and they use the same methods and sense of meticulous precision, but work in another location. Example: Leon built this cabinet, on less than 24 hours notice, in his shop, and from a drawing, and it fit in between two already installed components _precisely_ the next morning, I do mean precisely: https://picasaweb.google.com/1113554...5270069 82290 From this: https://picasaweb.google.com/1113554...77120382568930 (and yes, we calibrated/checked our table saw fence rulers about six years ago) And, I'm still impressed that by that feat ... Nice work, I don't understand why people argue about trying for as much accuracy as you can get. My experience has been that the more attention to the detail saves a lot of problems in finishing a project. You have a system that works well for you. I can't claim to always work to that accuracy but I applaud you for holding yourself to your standard. Mike M |
#48
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow)
"Lew Hodgett" wrote:
Are you using 1" = 25.6 mm? Lew ------------------------------------- "Puckdropper" wrote: I hope not. 1" = 25.4 mm. Puckdropper ----------------------------------------- Is the mind the first or the second thing to go? Lew |
#49
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow)
Lew Hodgett wrote:
"Lew Hodgett" wrote: Are you using 1" = 25.6 mm? Lew ------------------------------------- "Puckdropper" wrote: I hope not. 1" = 25.4 mm. Puckdropper ----------------------------------------- Is the mind the first or the second thing to go? Only your ureologist knows for sure... -- -Mike- |
#50
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 2/27/2013 5:54 PM, Mike M wrote:
...I don't understand why people argue about trying for as much accuracy as you can get. My experience has been that the more attention to the detail saves a lot of problems in finishing a project. You have a system that works well for you. I can't claim to always work to that accuracy but I applaud you for holding yourself to your standard. I do it simply because my work requires it. Here's an absolute perfect example of how easy it is to be bit in the butt by 1/16" if you don't: https://picasaweb.google.com/1113554...91840854584354 Rotating, a part 1/16" over 2 3/8" (instead of making a small, 1.4 degree, compound angle, cut in the apron) causes an almost 3/4" error in leg offset ... totally unacceptable, and grievous, for both intended use, and implementation of design. Imagine, what it would do to your reputation and bottom line, to give a client, who paid you good money for a faithful reproduction, the chair on the right, and then have her put it next to an existing chair in her dining room and expect them to visually line up for her next dinner party. The tendency to ignore precise measuring, and angle inconsistencies, no matter how convenient to do so, is a fools game that will very often result in unintended consequences costing time, money and materials. (Also points out the wisdom of making a detailed, scale model of your project before you ever go out to the shop so these types of issues can be sussed out on paper, instead of on materials ... IOW, enter the obligatory Sketchup tout, once again G) And no ... I did not make this mistake, although I did wonder just what the consequences/impact of eight fewer compound angle mortise and floating tenon joints would have on the project ... thanks to Sketchup, that was easier to determine than would otherwise been possible ... just thought I'd share it.) Measure twice, carefully and with precision ... then repeat as often as necessary. -- eWoodShop: www.eWoodShop.com Wood Shop: www.e-WoodShop.net https://plus.google.com/114902129577517371552/posts http://www.custommade.com/by/ewoodshop/ KarlCaillouet@ (the obvious) |
#51
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On Thu, 07 Mar 2013 07:59:45 -0600, Swingman wrote:
On 2/27/2013 5:54 PM, Mike M wrote: ...I don't understand why people argue about trying for as much accuracy as you can get. My experience has been that the more attention to the detail saves a lot of problems in finishing a project. You have a system that works well for you. I can't claim to always work to that accuracy but I applaud you for holding yourself to your standard. I do it simply because my work requires it. Here's an absolute perfect example of how easy it is to be bit in the butt by 1/16" if you don't: https://picasaweb.google.com/1113554...91840854584354 Rotating, a part 1/16" over 2 3/8" (instead of making a small, 1.4 degree, compound angle, cut in the apron) causes an almost 3/4" error in leg offset ... totally unacceptable, and grievous, for both intended use, and implementation of design. Imagine, what it would do to your reputation and bottom line, to give a client, who paid you good money for a faithful reproduction, the chair on the right, and then have her put it next to an existing chair in her dining room and expect them to visually line up for her next dinner party. The tendency to ignore precise measuring, and angle inconsistencies, no matter how convenient to do so, is a fools game that will very often result in unintended consequences costing time, money and materials. (Also points out the wisdom of making a detailed, scale model of your project before you ever go out to the shop so these types of issues can be sussed out on paper, instead of on materials ... IOW, enter the obligatory Sketchup tout, once again G) And no ... I did not make this mistake, although I did wonder just what the consequences/impact of eight fewer compound angle mortise and floating tenon joints would have on the project ... thanks to Sketchup, that was easier to determine than would otherwise been possible ... just thought I'd share it.) Measure twice, carefully and with precision ... then repeat as often as necessary. I had to look at that drawing a bit to grasp how much that 1/16" caused the measurement to change. The sketch up is definitely something I'm slowly learning. |
#52
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 3/7/2013 7:59 AM, Swingman wrote:
On 2/27/2013 5:54 PM, Mike M wrote: ...I don't understand why people argue about trying for as much accuracy as you can get. My experience has been that the more attention to the detail saves a lot of problems in finishing a project. You have a system that works well for you. I can't claim to always work to that accuracy but I applaud you for holding yourself to your standard. I do it simply because my work requires it. Here's an absolute perfect example of how easy it is to be bit in the butt by 1/16" if you don't: https://picasaweb.google.com/1113554...91840854584354 Rotating, a part 1/16" over 2 3/8" (instead of making a small, 1.4 degree, compound angle, cut in the apron) causes an almost 3/4" error in leg offset ... totally unacceptable, and grievous, for both intended use, and implementation of design. Imagine, what it would do to your reputation and bottom line, to give a client, who paid you good money for a faithful reproduction, the chair on the right, and then have her put it next to an existing chair in her dining room and expect them to visually line up for her next dinner party. The tendency to ignore precise measuring, and angle inconsistencies, no matter how convenient to do so, is a fools game that will very often result in unintended consequences costing time, money and materials. (Also points out the wisdom of making a detailed, scale model of your project before you ever go out to the shop so these types of issues can be sussed out on paper, instead of on materials ... IOW, enter the obligatory Sketchup tout, once again G) And no ... I did not make this mistake, although I did wonder just what the consequences/impact of eight fewer compound angle mortise and floating tenon joints would have on the project ... thanks to Sketchup, that was easier to determine than would otherwise been possible ... just thought I'd share it.) Measure twice, carefully and with precision ... then repeat as often as necessary. And to further support accuracy beyond 1/32", the below link goes to my desk top which I glued up today. Length 93.5" Height 54" Depth 14.5". 8 dado's in the plywood panels and 12 dado/groves in the front and back face frames, no butt joints. Back and front face frames are not identical, back rails are different length as are the center stiles from the front rails. Back center stiles are also wider than the front center stiles. Nothing was cut to fit, all was cut exactly to reflect the plans. Had any cuts been off this would non have locked together as it did. Whew! http://www.flickr.com/photos/lcb1121...9515/lightbox/ |
#53
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 3/7/2013 2:16 PM, Leon wrote:
And to further support accuracy beyond 1/32", the below link goes to my desk top which I glued up today. Length 93.5" Height 54" Depth 14.5". 8 dado's in the plywood panels and 12 dado/groves in the front and back face frames, no butt joints. Back and front face frames are not identical, back rails are different length as are the center stiles from the front rails. Back center stiles are also wider than the front center stiles. Nothing was cut to fit, all was cut exactly to reflect the plans. Had any cuts been off this would non have locked together as it did. Whew! http://www.flickr.com/photos/lcb1121...9515/lightbox/ Damn ... and I was looking forward to coming over and helping you pound on it to fit!! Looking good! Had my own "Whew" just a minute ago ... all frame mortises & tenons cut, aprons and rails done, and dry fit: https://picasaweb.google.com/1113554...85181 0598658 Routing mortises accurately in curved parts is pucker time, indeed. I still have the curved back rests slats left ... onward. -- eWoodShop: www.eWoodShop.com Wood Shop: www.e-WoodShop.net https://plus.google.com/114902129577517371552/posts http://www.custommade.com/by/ewoodshop/ KarlCaillouet@ (the obvious) |
#54
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On Thu, 07 Mar 2013 14:16:27 -0600, Leon lcb11211@swbelldotnet
wrote: On 3/7/2013 7:59 AM, Swingman wrote: On 2/27/2013 5:54 PM, Mike M wrote: ...I don't understand why people argue about trying for as much accuracy as you can get. My experience has been that the more attention to the detail saves a lot of problems in finishing a project. You have a system that works well for you. I can't claim to always work to that accuracy but I applaud you for holding yourself to your standard. I do it simply because my work requires it. Here's an absolute perfect example of how easy it is to be bit in the butt by 1/16" if you don't: https://picasaweb.google.com/1113554...91840854584354 Rotating, a part 1/16" over 2 3/8" (instead of making a small, 1.4 degree, compound angle, cut in the apron) causes an almost 3/4" error in leg offset ... totally unacceptable, and grievous, for both intended use, and implementation of design. Imagine, what it would do to your reputation and bottom line, to give a client, who paid you good money for a faithful reproduction, the chair on the right, and then have her put it next to an existing chair in her dining room and expect them to visually line up for her next dinner party. The tendency to ignore precise measuring, and angle inconsistencies, no matter how convenient to do so, is a fools game that will very often result in unintended consequences costing time, money and materials. (Also points out the wisdom of making a detailed, scale model of your project before you ever go out to the shop so these types of issues can be sussed out on paper, instead of on materials ... IOW, enter the obligatory Sketchup tout, once again G) And no ... I did not make this mistake, although I did wonder just what the consequences/impact of eight fewer compound angle mortise and floating tenon joints would have on the project ... thanks to Sketchup, that was easier to determine than would otherwise been possible ... just thought I'd share it.) Measure twice, carefully and with precision ... then repeat as often as necessary. And to further support accuracy beyond 1/32", the below link goes to my desk top which I glued up today. Length 93.5" Height 54" Depth 14.5". 8 dado's in the plywood panels and 12 dado/groves in the front and back face frames, no butt joints. Back and front face frames are not identical, back rails are different length as are the center stiles from the front rails. Back center stiles are also wider than the front center stiles. Nothing was cut to fit, all was cut exactly to reflect the plans. Had any cuts been off this would non have locked together as it did. Whew! http://www.flickr.com/photos/lcb1121...9515/lightbox/ I do agree with you, just haven't achieved the ability to perfectly execute all of it yet. Did invest in the drill press table and fence from Woodpecker so looking forward to trying that. I do agree with the idea of using sketchup and batch cutting. I'm also quilty of having way to many things going on. Anyway your project is coming along great and looks great as well. If I didn't have to take these pain pills it would probably help my accuracy too. |
#55
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
Swingman wrote in
: On 3/7/2013 2:16 PM, Leon wrote: And to further support accuracy beyond 1/32", the below link goes to my desk top which I glued up today. Length 93.5" Height 54" Depth 14.5". 8 dado's in the plywood panels and 12 dado/groves in the front and back face frames, no butt joints. Back and front face frames are not identical, back rails are different length as are the center stiles from the front rails. Back center stiles are also wider than the front center stiles. Nothing was cut to fit, all was cut exactly to reflect the plans. Had any cuts been off this would non have locked together as it did. Whew! http://www.flickr.com/photos/lcb1121...9515/lightbox/ Damn ... and I was looking forward to coming over and helping you pound on it to fit!! Looking good! Had my own "Whew" just a minute ago ... all frame mortises & tenons cut, aprons and rails done, and dry fit: https://picasaweb.google.com/1113554...hopMissionChai rReproduction2013#5852694851810598658 Routing mortises accurately in curved parts is pucker time, indeed. I still have the curved back rests slats left ... onward. Wow ... -- Best regards Han email address is invalid |
#56
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
Swingman wrote:
On 3/7/2013 2:16 PM, Leon wrote: And to further support accuracy beyond 1/32", the below link goes to my desk top which I glued up today. Length 93.5" Height 54" Depth 14.5". 8 dado's in the plywood panels and 12 dado/groves in the front and back face frames, no butt joints. Back and front face frames are not identical, back rails are different length as are the center stiles from the front rails. Back center stiles are also wider than the front center stiles. Nothing was cut to fit, all was cut exactly to reflect the plans. Had any cuts been off this would non have locked together as it did. Whew! http://www.flickr.com/photos/lcb1121...9515/lightbox/ Damn ... and I was looking forward to coming over and helping you pound on it to fit!! Looking good! Had my own "Whew" just a minute ago ... all frame mortises & tenons cut, aprons and rails done, and dry fit: https://picasaweb.google.com/1113554...85181 0598658 Routing mortises accurately in curved parts is pucker time, indeed. No kidding but looking really good! I still have the curved back rests slats left ... onward. O'boy, |
#57
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 3/7/2013 1:25 PM, Mike M wrote:
I had to look at that drawing a bit to grasp how much that 1/16" caused the measurement to change. The sketch up is definitely something I'm slowly learning. Being an ex-artilleryman I'm not a stranger to angular deviation, but I was struck by the magnitude of this particular situation myself. -- eWoodShop: www.eWoodShop.com Wood Shop: www.e-WoodShop.net https://plus.google.com/114902129577517371552/posts http://www.custommade.com/by/ewoodshop/ KarlCaillouet@ (the obvious) |
#58
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
Swingman wrote:
On 3/7/2013 1:25 PM, Mike M wrote: I had to look at that drawing a bit to grasp how much that 1/16" caused the measurement to change. The sketch up is definitely something I'm slowly learning. Being an ex-artilleryman I'm not a stranger to angular deviation, but I was struck by the magnitude of this particular situation myself. Likewise (although not with the artillery background), I am familar with the fact that the deviations will result in greater deviations over distance, but I too was surprised at what such a seeminly small tweak resulted in with your chair. -- -Mike- |
#59
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
On 3/8/2013 8:39 AM, Mike Marlow wrote:
Swingman wrote: On 3/7/2013 1:25 PM, Mike M wrote: I had to look at that drawing a bit to grasp how much that 1/16" caused the measurement to change. The sketch up is definitely something I'm slowly learning. Being an ex-artilleryman I'm not a stranger to angular deviation, but I was struck by the magnitude of this particular situation myself. Likewise (although not with the artillery background), I am familar with the fact that the deviations will result in greater deviations over distance, but I too was surprised at what such a seeminly small tweak resulted in with your chair. It makes sense when you think about it. Visualize this: Rotate a vertical line, 40 1/4" high (which is roughly the height of the center point of the curved chair leg), 1.4 degrees around a point 16 13/16" (the height of the top of a side apron) from the bottom of the line. That rotation moves the top and bottom points of the line just shy of 1" away from each other on the vertical plane (13/32" on the bottom, and 19/32" on the top +/-). Being aware of that is what got me to checking ... (I was really looking for a way around routing mortises on the edge a compound angled apron). Although the Multi-Router makes that operation a piece of cake, the fact of mirror images and references edges with grain direction being involved, made mistakes inevitable ... and this job has a razor thin margin for material costs. Another option would have been to angle the face of the leg at the mating point appropriately, but that causes just as many consequences that needed to be guarded against. Oh well, all's well that ends well ... -- eWoodShop: www.eWoodShop.com Wood Shop: www.e-WoodShop.net https://plus.google.com/114902129577517371552/posts http://www.custommade.com/by/ewoodshop/ KarlCaillouet@ (the obvious) |
#60
Posted to rec.woodworking
|
|||
|
|||
Domin-OH (wow) - working with 1/32 precision ...
Swingman wrote in
: On 3/8/2013 8:39 AM, Mike Marlow wrote: Swingman wrote: On 3/7/2013 1:25 PM, Mike M wrote: I had to look at that drawing a bit to grasp how much that 1/16" caused the measurement to change. The sketch up is definitely something I'm slowly learning. Being an ex-artilleryman I'm not a stranger to angular deviation, but I was struck by the magnitude of this particular situation myself. Likewise (although not with the artillery background), I am familar with the fact that the deviations will result in greater deviations over distance, but I too was surprised at what such a seeminly small tweak resulted in with your chair. It makes sense when you think about it. Visualize this: Rotate a vertical line, 40 1/4" high (which is roughly the height of the center point of the curved chair leg), 1.4 degrees around a point 16 13/16" (the height of the top of a side apron) from the bottom of the line. That rotation moves the top and bottom points of the line just shy of 1" away from each other on the vertical plane (13/32" on the bottom, and 19/32" on the top +/-). Being aware of that is what got me to checking ... (I was really looking for a way around routing mortises on the edge a compound angled apron). Although the Multi-Router makes that operation a piece of cake, the fact of mirror images and references edges with grain direction being involved, made mistakes inevitable ... and this job has a razor thin margin for material costs. Another option would have been to angle the face of the leg at the mating point appropriately, but that causes just as many consequences that needed to be guarded against. Oh well, all's well that ends well ... Yes, that is also the way leverage works. I think you're making great reproductions now (not like the watches on the streets of NY at all!! smirk). I even understand the angling on the face of the leg ... Great work, annd great explanations, as usual!! -- Best regards Han email address is invalid |