It's the Little Things that Drive You Nuts!
Hey;
I wrote recently about taking lots of pictures before you begin a project like this so that getting it back together will be easier. So easy in this digital age. Take lots of pics I said. You know... my own advice really helped again, if by accident!
Here's a little trifle that has taken some valuable moments out of my life this afternoon. How do the little brackets go that mount the drive box to the back of the headstock? No big deal. Working on the sage advice of those who steered you into buying the parts manual, you find the requisite page, peruse the diagram, and get the info you need. This is how part LA-657 sits, and on they go. This is an excerpt of my colored version of the Logan isometric diagram that is in the parts manual, clearly showing how they sit in relation to the mount holes in the drive box.
So on they go and... what? This can't be right... A quick check with a ruler easily confirms this snap diagnosis. Huh? Said documentary photos loom large at these moments, so back into the computer files to see what we can learn. Not a one of them was taken to document this little detail. After all.. who knew? Ah.... wait... there's one that accidentally shows the direction they go! The diagram is WRONG! :angry:
Out of curiosity, I take a look at another piece of documentation that "far too many" idle hours floating about the internet have produced. An early sectional view of the same assembly that predates the isometric versions that Logan did later. These early schematics are decried as hard to decipher relative to the exploded versions that came later, but they do prove their worth. Yet more idle moments have seen me coloring and cleaning them to improve the contrast.
What gives? This clearly shows the mounts being reversed from the other diagram. Was there some sort of running change in the parts spec, or did Logan blow it when drawing up the later diagrams? Hard to say, but the combination of this early schematic and my photos set me on the right course, at last!
Sort of... If that was a puzzle, this is a conundrum. How do they go now that I know how they go? These are supposed to be the same part, but these... aint. Should I have freekin mark matched these damn things before I took them off. Again... who knew?
Here they are on a surface plate, lined up on their perimeter. One can only imagine the speed at which these lathes were being thrown together back in the war years. Hey... whaddaya want for a dollar-two-ninety-eight? Well, maybe three-two-ninety-eight, but... They clearly had a part tolerance here that you could drive a truck through. Do these angle up or down? The guy jigging these up on the grinder clearly had his good and bad moments!
In the end, I don't imagine it is very critical and can be worked around by the now-seen-as-wisely generous tolerance on the mounting holes. It'll work out just fine, but it sure throws you for a loop, if only momentarily.
