Re: Dadio's 3D Printing Stuff
Posted: Thu Apr 28, 2022 10:08 am
Wonderful job!
I also use PLA for prototyping, as it is really easy to print, and it doesn't shrink: if printer is properly calibrated, it is dead easy to validate parts, and to sport the mistake. One thing I did wrong in the past was not assembling my test prints : it may not be much but half millimeter on some stuff may be a whole issue... But I guess you are doing it always as per your comments on my Nichimo threadDadio wrote: ↑Fri Apr 29, 2022 8:53 am This is just PLA , it's not nearly strong enough to use but it's cheap and perfect for prototyping , I find you can measure all you like and it seems perfect on screen but once a part is in your hand and directly next to the original you can often see mistakes .
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Well. Sound like the Samurai cages : I got 3 samurai, one was missing one of the brace, and the two others are complete, and I have a brand new roll cage in plastic. I measured all of them : no consensus on the right measurements when the roll cage speaksDadio wrote: ↑Sat Apr 30, 2022 5:04 pm Finished the front and rear transmission housings , a job made more confusing by my warped original chassis , it looks wrong even when it's rightanyway now it's done and I have a chassis model as well I can complete the cage , once off the car and in pieces the cage is like a wet noodle , virtually impossible to measure correctly
But now it's going to be way easier
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I'm glad it's not just me that had a hard time with the Samurai chassis !silvertriple wrote: ↑Sat Apr 30, 2022 5:45 pmWell. Sound like the Samurai cages : I got 3 samurai, one was missing one of the brace, and the two others are complete, and I have a brand new roll cage in plastic. I measured all of them : no consensus on the right measurements when the roll cage speaksDadio wrote: ↑Sat Apr 30, 2022 5:04 pm Finished the front and rear transmission housings , a job made more confusing by my warped original chassis , it looks wrong even when it's rightanyway now it's done and I have a chassis model as well I can complete the cage , once off the car and in pieces the cage is like a wet noodle , virtually impossible to measure correctly
But now it's going to be way easier
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. About 1.5 to 2cm deviations for some measurements... And that's also the case for other parts
... Don't worry too much, it will fit anyway
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Although Japanese factories are known for long to have introduced very early Statistical Process Controls and other ways to achieve a better quality in production, either Marui did not used that, or there was still large deviations. And just to be precise, when I was having a doubt because of the range of measures, I asked @optimaforever how much he measured on his side, and he told me another value which even increased the deviation range
When you look at the reverse side of the Samurai chassis and look at the machining of the mould it looks very rough and ready , all the sectioned out areas are like granny's patchwork quilt , they don't smoothly transition but have steps , I think even the machinists had a had time making the mouldsilvertriple wrote: ↑Sun May 01, 2022 3:11 amAlthough Japanese factories are known for long to have introduced very early Statistical Process Controls and other ways to achieve a better quality in production, either Marui did not used that, or there was still large deviations. And just to be precise, when I was having a doubt because of the range of measures, I asked @ optimaforever how much he measured on his side, and he told me another value which even increased the deviation range![]()
. In short, we should rely on the Nylon flexibility to help, and we have to understand what distances are really key and need to be absolutely right, and which one may not be that important... Another learning curve by itself
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And looking at the deviation range, it is even possible there was just more than one mouldDadio wrote: ↑Sun May 01, 2022 3:18 am When you look at the reverse side of the Samurai chassis and look at the machining of the mould it looks very rough and ready , all the sectioned out areas are like granny's patchwork quilt , they don't smoothly transition but have steps , I think even the machinists had a had time making the mould![]()