Posted by BillS on May 14, 2012 at 19:00:17:
In Reply to: how to find out the OB AND IB OF SPIRAL BEVEL CUTTER posted by paramjit singh on May 14, 2012 at 11:29:23:
I'm not sure what the question is, so why don't we start here?
Below is a link to a FAQ topic dealing with some simple Gleason cutter numbering. It shows examples of how Gleason standardizes asymmetrical cutter blade angles. This "numbering system" is true for solid and inserted blade bodies.
Calculating IB and OB diameters is part of the process when using a method where a desired sum of cutter numbers cannot be found in the user's inventory. Normally a method will support a "standard" set of cutters for which the diameters, point widths, numbers, etc. are predetermined by Gleason. Gleason has designed jobber methods to use standard cutters (known by their cutter numbers) and thus avoid specially ground cutters.
Normally a method will produce an ideal sum of cutter numbers for a pair of members (gear and pinion). If the user has a pair of cutters whose sum of numbers falls within an acceptable range around the ideal sum produced by the method, then the method can proceed with those cutters. The range of acceptibility is also determined by the method. If the user cannot make up the pair of cutters with acceptible sum of cutter numbers, then the user must either buy cutter(s), or select available cutters and adjust their OB and IB point diameters from their nominal or "standard" sizes.
The software sold here for spiral gears produces the required OB and IB diameters for a pair of cutters that are out of range of the ideal sum.
Adjusting the blades is usually a last resort for most shops.
That's about the extent of my knowledge - hope someone is willing to share and enlighten us.
Post a Followup