Bouchonnage / Engine Turning / Jewelling / Pfauenaugendesign... 😱
😉Work is still on progress - pics ASAP...
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Did you use a step drill for those holes? They look rather clean for a stepdrill so you have me wondering
Thanks Gideon ! 😉
For the biggest on chassis top, I used a bell saw or hole saw (scie cloche in French) :
For the others, I used a GreenLee punch tool :
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that explains the clean holes, I used one of those step drills and well... it needed some filework afterwards to clean it up. That is going to be a nice pair when you slap some paint on them 🙂
Well, yes : that's my problem... I am completely unable and untooled to acheive a good paint job. 😱
All my attempts in the past where nightmares ! 😡😡😡 I mean : doing a durable, abuse-resistant and nice paint job.😕
So the chassis will stay with the top engine-turned as done and the sides unfinished aluminium as is. It's not the nicest 🙁, but it won't deteriorate over time. 😎
Sure, a Dark Candy Green Metallic (for example) would have been premium 🙄, but it's out of my reach. 😛
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Oh I thought you were going to paint the sides black or something, but the industrial look is nice too 🙂
Thanks @gideon1990 ! 😉
Well yes, good idea, indeed. But I'm reluctant to go the painting way for fear of being disappointed again and again... 🙁
That said, I'll try some polishing, brushing or fine sanding in the bottom of the cover to see how it looks. Engine Turning is another possibility of course, but I think it would look "Too Much"...
The inside layout takes shape, step by step...
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Work is on progress : testing the PA HV filtering module :
With 10VDC dual-rectified (diode bridge) and an input ripple of 106mVAC TRMS, the module leaves less than 1mVAC TRMS output ripple at no load. That is to say a ripple attenuation of circa 100.
With the dual chokes shorted, still with 10V and 106mV input ripple, the output ripple reaches 53mV unloaded. That is to say a ripple attenuation of only 2.
Verdict : despite their small size (2x6V 4.2VA) and low DCR (1R per winding), these dual chokes proves to be efficient, due to phase cancellation wiring.
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With 10VDC dual-rectified (diode bridge) and an input ripple of 106mVAC TRMS, the module leaves less than 1mVAC TRMS output ripple at no load. That is to say a ripple attenuation of circa 100.
With the dual chokes shorted, still with 10V and 106mV input ripple, the output ripple reaches 53mV unloaded. That is to say a ripple attenuation of only 2.
Verdict : despite their small size (2x6V 4.2VA) and low DCR (1R per winding), these dual chokes proves to be efficient, due to phase cancellation wiring.
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Thanks again, @gideon1990 ! 🙂
Work is still in (slow) progress... I expect to finish the parts assembly tomorrow and start if I can the wiring of the PA HV filtering module... I expect... 🙄
Wait and See...
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Another name (in German) for our French bouchonnage...
A variant existed also, called grattage... It was used on some old engines, namely Bugatti :
Conversely to engine turning, it was completely hand-done, with a scraper stylus.
Work progresses again and again...
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