Can Anyone Make Bevel Gears?

Rick Rowlands,
Not to rain on your parade, but further to Forrest's post:

Spiral bevel blanks have different face & root angles than straight or Zerol bevel gears.
As For the calc's it's called a "machine summary" this has to be done first before the drawing change, because this is where the numbers come from.

The straight gear cutters are relatively simple compared to Zerol & spiral cutters.
Three Diametral Pitch cutters are probably going to be 12.00" Diameter heads so, if the gear shop has the cutter heads (about $8,000.00 each 's) the blade and shim sets, one for the gear & two sets for the pinion say $6,000.00 a set, used to be 12 weeks delivery, You are all ready into a big number.

Machine tooling, nose arbor for each part both for the cutting machine and the test machine, these are some moderately big parts so the arbors are going to be big too, cutting machine needs custom draw rods for the hydraulic chucking system on "Gleason" machines.

Now you go to heat treat and you hope the gear house engineer has enough experience to accurately guesstimate how the spiral is going to unwind, so that your gears finish up with the correct contact pattern. Drwg difficult to read, is that Rc 30? If so I would have rough blanked, NQ&T to Rc 30, finished machined & then finished cut the gear teeth.

I had many one off quotes & did not see the customer proceed, some that did I ground the parts from the solid, takes a while grinding, but you did save overall for one or two parts versus the cutter cost, you still have arbor costs, also gear house will probably need at least one set of parts for setup & development, usually do not need for straights.

I wish you well in your endeavor,

Les H.

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