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Charts for 40:1 dividing heads are published in the Machinery's handbook and likely any other machinist's handbook; so far as I have seen, only rotary tables are made in 90:1 ratio.
I’m a bit of a bull in a China shop, my first thoughts are always tear it down and see how it works however, my reading suggests that the better quality ones have taper bearings that need pre loads etc are necessary. Taper bearing preload setting is all voodoo stuff to me so I’d rather get a manual with hopefully a schematic and maintenance details before Stepping forward with spanner’s in handLooks like a winner! I probably would have it pulled apart by now to clean the internals and familiarize myself with its functions.
The end gearing is for differential indexing so that prime numbers can be indexed, and also so that spirals may be cut. If this is a 40:1 ratio unit, info pertaining to any other universal dividing head of the same ratio would be appropriate.
I say, "let sleeping dogs lie", a lot of damage can be done by the well intensioned in disassembling the innards of a sophisticated mechanism.I’m a bit of a bull in a China shop, my first thoughts are always tear it down and see how it works however, my reading suggests that the better quality ones have taper bearings that need pre loads etc are necessary. Taper bearing preload setting is all voodoo stuff to me so I’d rather get a manual with hopefully a schematic and maintenance details before Stepping forward with spanner’s in hand
Find a copy of Brown & Sharpe's book, "Practical Treatise of Milling and Milling Machines", it presents all phases of the milling processes in a clear simple manner, right down to the calculations for dividing, both simple and for prime numbers, spiral milling, and is complete with tables of dividing and tables of leads for spiral milling. All the info. pertains to the dividing head that you have (40:1 ratio). Cincinnati Milling Machine Co. also published a similar book, but much more wordy and technical.Not my video, but one I used extensively when researching how to get the best out of my dividing head. Don't worry about lack of gears: mine only came with a single gear. I cut the rest myself!
The other cool feature of the aux input on a dividing head is the ability to gear it to the table feed and spiral mill, cut helicals, make cams... All sorts of interesting stuff.
Find a copy of Brown & Sharpe's book, "Practical Treatise of Milling and Milling Machines"