Lathe Hack and old school tool use.

[Worth1]

I'm finished.

I took the other plate I made, drilled two clearance holes for cap screws to connect to T nuts in the T slot.
Drilled and tapped 1/2 20 threads for the other bolts to connect to the plate.
Had to drill out smaller washers so they would have room to fit in the rotary table.
It was the easy way out, I could have made custom ones.
The apparatus sits on a cantilever of sorts and very ridged.
In last picture you will see one of my homemade T Nuts.

[Worth1]

Here they are, I think I used just about everything in the book to do it.
From my parallel set to the height guage.


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[Worth1]

Here is a mockup demonstration of how this all fits together using a lathe dog to rotate the part.
The lathe dog is the gray thing attached to the shiny rod.

Lathe dog.
https://en.wikipedia.org/wiki/Lathe_carrier
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[Worth1]

Been looking out of curiosity about what indexing plate it would take to cut 91 and 127 tooth gears.
None of mine will do it.
Found an on line calculator to see if I could come up with the right plate with the right amount of holes to do it.
None will do it.
I came to the conclusion it would have to be compound indexing where you not only use the holes but turn the plate too.
No way can I do that.
Then I found old manuals from years ago where they di do such a thing.
Something they dont do anymore.
It is some really old school stuff involving a lot of math.

Here is a link to an old book on indexing with more information than you would ever want.
I ended up in a rabbit hole about helical indexing in another old book from the late 1800's.
You can start from the beginning if you want.
This is how they did it before computers and the reason it is here.
http://babel.hathitrust.org/cgi/pt?i...iew=1up;seq=79

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Talked to the guy that bought the old lathe I showed awhile back.
He couldn't thank me enough for showing him how to run it and a few tips and tricks.
He bought a bull nose live center right after I left his house.
It fits in the tail stock and then into larger diameter pipe to keep it supported.

[Worth1]

Surfacing rough finish on cast iron with the hand file.
Draw filling in progress.
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[Worth1]

It is getting more and more difficult to find people that know what any machine shop equipment is or what it does.
Their lack of curiosity is dismaying to say the least.