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| Potty Simpson build - MZT |
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| mzt:
Could not even think about lowering the entire head: my mill being way too coarse in that. Now You tell me, I seem to recall having done exactly the same while boring the Bernays, or I did bore to quill depth, raise the quill, lower the head and down quith the quill again. Cannot say which: unless I've put it down in words, it's forgotten. Sure, it that was a matter of not having enough quill travel to get the job done, in that case. Worth having a look at what is inside the mill column, anyway: they may have hidden some adjustable parts there, too, who knows? Will check. Thank You. Marcello |
| krv3000:
im looking fowert to this one to |
| mzt:
Bob, DON'T hold Your breath! :D (ain't ever been quick into building engines. And I'm no more doing them in haste to see them running) Marcello |
| mzt:
Proper tools make a difference And what a difference they make! I had started the previous cut using the 24tpi frame: all the teeth were still there, but they had already faced hours of activities. Not being entirely convinced I’d have brought the job to completion, there was no point into wasting shop time looking for a new blade, nor I wanted to risk one of the precious coarse ones. By the time I got “convinced”, I had already grooved the four faces: no place to start a new cut, had to go on with what I had used before. You don’t want use a new blade into an old cut, You know. On this occasion, I decided to risk using the 18tpi frame*, knowing it had only faced little use on aluminium. Even took the risk of cutting closer to the scribed line: You really need to make it all wrong to get a wandering cut into C.I. Putting the “difference” into numbers, this job was done in 22 minutes. Marcello -- (*) Yep! Some years ago I bought myself three identical frames, to put an end to the repeated blade changes, to suit the job at hand. I wish I had purchased quality ones. |
| mzt:
What about a link to Stew's design and build of this engine ? Just for history, all credits where they're due. http://madmodder.net/index.php?topic=6485.msg68756#msg68756 Marcello |
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