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Modifying a Southbend Headstock for Indexing

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Darren:
Nicely executed Bernd, that was some metal removal there  :dremel:

I can just see some poor soul having finally removed his stubborn South Bend Chuck along with a couple of back gear teeth crying over this one... :D

sbwhart:
Nice one Bernd.  :thumbup:

Love the lathe looks like an old Holbroock is it ?

Can we have a hint on the indexing, have you got some more gears available ?.

Cheers
 :wave:

Stew

Bernd:
Darren,

I guess I could have removed the teeth and saved them.  :lol:

Stew,

That is a Logan lathe. Don't know exactly the model, but it's early '70's. Has served me very well. Picked it up from a freind for $1000.00 plus a lot of live steam castings and copper for boilers. I think it was well woth the money.

No gear will be used. I'm going to use a some paper and a measuring tape (ruler).

Bernd

Bernd:
I did a quick sketch on Autosketch. I try not to use it but it comes in handy for things like this.

I figured I would use 32 holes on a bolt circle of 4.300". That works out to 11.25 degrees per hole. Enough holes for what I would need to do for now. Below is a sketch of the hole location.


So until I get the rest worked out. Keeping thinking about how I'm going to locate the holes.  :med:

Bernd

Bernd:
Well I screwed up big time with this project. I was going to make it for a 32 hole index, it should be for a 24 hole index. Divides much nicer than 32 and who wants 22.5 and 11.25 degree division. It's only useful in wood working. :scratch:

So with 24 holes you get a division of 0, 15, 30, 45, 60, 75, and 90 degress and so on. You wouldn't get that with 32 holes. Next I had to dig out my reference for drilling the holes. I remember seeing it in one of the magazines or books I have. While searching for the reference I came across an article on "Make a Dividing Head from a Lathe Headstock' in the Feb/Mar 2003 issue of Machinist Workshop (was Projects in Metal). The first picture in the article looked quite familar, see first pic in this htread. Then I realized it was Steve Wellcome aka "Mainer" that had posted the pic on HMEM. In the article he stated to use 24 holes also. So 24 holes it is.

I did finally find my reference to the article that showed how to originate an index plate for a dividing head. The article is in the book from Village Press (Homeshop Machinist) The Wisdom of Philip Duclos. He has an article on how to build a Model Makers Dividing Head. In it he gives instructions on how to make a template that gets used on the drill press for drilling holes in the division plate.

I gave that a try today and failed at getting good results. If anybody has the book you can check out the method used. I will post a quick write up of how it is done in the next couple of days. It'll take a few pics, and C-o-C's to explain. Also I'll explain why it might not work for me on this particular project.

Bernd

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