Greetings; I've about worn out that 7x10 I have, and its rubber tool post prevents me from doing anything resembling a fine finish regardless of the sharpness of the bit. When cutting threads I have to, before reversing the spindle to back away & reset to deepen the cut on the next pass, back the crossfeed off a full turn to keep the bit from dragging on the thread as it supposedly retraces its path backwards. I knew it was a toy when I bought it, and I'm considering its replacement with something big enough that its worthwhile cnc'ing it.
I have a need for cutting a clean, nearly interference fitted 1/4x28 external thread for a distance of about 1/4", immediately adjacent to a 1/2" diameter seating plane when this is screwed into its receiver. I don't have an encoder on either the lathe or the mills spindle, so the thought runs toward a flying cutter in the mill spindle whose tip profile is that of the 60 degree included angle tooth. Now, the cutter would be working on the side of the workpiece, mounted with the axis vertical in a chuck on a rotary table, turning very slowly as the z axis travels in 1/28 step. Since I can run the z axis and a axis in lock step, what prevents me from cutting this thread with the fly cutter other than finding a suitable fly cutter? I thought so, so where in tunket can I find such a fly cutter that is actually holding a single point threading insert, perhaps an inch in diameter overall. Googling hasn't found such a beast at less than 3" in diameter and many BIG bucks cost. Or is this just another tool I'll have to make, in which case it will be holding a less easily fractured square piece of HSS tool steel, not a carbide chip. Or is this just another idea I should forget because I'll not be able to hold an edge on the HSS tool because of the impact of its striking the workpiece and taking off a thou or less per revolution? Thanks guys. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Now I lay me down to sleep I pray the double lock will keep; May no brick through the window break, And, no one rob me till I awake. ------------------------------------------------------------------------------ Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
