On Tuesday, December 27, 2011 12:32:26 AM charles green did opine: > 60 degree included angle double angle cutter, such as > > http://www.use-enco.com/cgi/INSRIT?PMAKA=367-7100&PMPXNO=948041&PARTPG=I > NLMK32 > might work. not too too spendy, and can be ground to get within a full > thread of a step.
Ordered 3. > the solid carbide lathe I.D. thread tools work too > if you can set them up to turn eccentrically (a boring head performs > this function quite nicely.) the carbide single points are nice > because they come in smaller effective cutting diameters, so the > deviation from thread profile can be minimized to an extent when just > using helical interpolation. if you're using a rotary table set at the > proper angle, this is not a problem. another approach is to set the > rotary table to cut the thread with the spindle at 90 degrees to the > thread axis using a 60 degree chamfer tool, like > http://www.use-enco.com/cgi/INSRIT?PMAKA=325-2218&PMPXNO=5809091&PARTPG= > INLMK3 This one looks like I could mill pcb's with it too, so I ordered 5. > note: the sharp points on such tools are REALLY fragile, so go super > slow feed if you need a sharp vee. it's possible to hand grind a tool > like this out of a broken old carbide tool stub, but in my experience, > it takes many many tries to get the point on the center of the shaft > (+/- a small flat end tolerance) and still have the required back > relief all the way around. > The first looks as if I can make the nipples with it, the second I can isolation route pcb's with. These opto gizmo's have a very small .050" connection pattern, so I suspect I'll be hand carving code, probably to bolt them to the PCB, and bend the leads over onto runners that will lead to the through holes for the leads. Too small at 50 thou spacing to try & cut a pad around the hole. Besides, if I bolt them to the board, I can loosen the bolts and tap them around to get decently quadrature timings from the AB set. But I may have to come and ask where the X pulse time should be referencing the AB timing. Its slot is cut the same width as the AB slots so I'm not sure how the logic works to pick the same edge depending on the direction. I just downloaded the manual for that Grizzly G9972Z lathe and made a discovery, it does have a reversible spindle motor, but doesn't say so in the sales propaganda. So cnc'ing that just got a bunch easier because I can reverse it with 3 sequenced relays & a bit of logic plus a timer. :) I'm going to be busy with this transmitter conversion here in another week or so ($$ coming in), plus Russ is picking me up for a 2 or 3 day trip to Iron Mountain to see if I can revive that 40 year old Harris transmitter one more time, (more $$ coming in) so I believe I'll have that Grizzly G9972Z I've been drooling over loaded into the back of my pickup and coming home with me before warm weather. I am about a 6 hour trip away from Muncie PA. And I can feed my GMC both ways for about the freight they charge. About 700 lbs, it should be a hell of a lot more rigid than this rubber 7x10 I am screwing with now. It may not be a great lathe, but it will be a bigger grin for me. 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> When confronted by a difficult problem, you can solve it more easily by reducing it to the question, "How would the Lone Ranger handle this?" ------------------------------------------------------------------------------ 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
