On Thu, 2008-06-12 at 01:51 -0700, Kirk Wallace wrote: > On Thu, 2008-06-12 at 08:31 +0100, Steve Blackmore wrote: > ... snip > > > > http://www.jeffree.co.uk/Pages/cnc-wheel-cutting-engine.htm > > > > I've seen that in operation and used it at a show here in the UK, it's > > not slow, gear cutter rpm was about 2500 rpm and you can stuff the > > cutter through the blank full depth - I guess feed was about 100 ipm. > > > > On thin brass blanks, I reckon it takes no longer than 1 second a tooth. > > > > Steve Blackmore > > What I am proposing is a little different. The machine above uses a > cutter that cuts one complete gear tooth form that matches the pitch and > diameter for the gear being made. Theoretically, each gear diameter and > pitch needs to have a custom cutter, but sometimes one cutter can be > used for a few different gear diameters within the same pitch class. So > if you cut allot different gears, you will need allot of expensive > cutters. > > I want to use the same style cutter, except it will cut a simple > radiused groove with a radius slightly smaller than the smallest radius > in the gear tooth form. The cutter would be used like a ball end-mill to > follow the tooth shape. I would only need a cutter for each pitch. It > might even be possible to have indexable tooling.
Here is my latest scenario for making gears with generic (almost) tooling: http://www.wallacecompany.com/machine_shop/gear_cutting-2b.png After roughing, the raduised slot cutter (blue) would sweep X (pointing towards the viewer) and increment A (gear rotation) for a short period until the root radius is formed. The the flat bottom (South face) of the slot cutter would be used to cut the critical mesh area (between the inner gray circles) by incrementing A and Z (North direction of picture). The remaining tip radius could be done with a tool change to an end-mill, again sweeping X and incrementing A and Z. Now I just need to build a rotary axis for my mill to see if the plan will work. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC/EMC CNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/EMC CNC) ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
