On Wed, 2008-07-02 at 19:44 -0500, Chris Radek wrote: > On Wed, Jul 02, 2008 at 04:47:31PM -0700, Kirk Wallace wrote: > > > > Videos here: > > http://www.wallacecompany.com/machine_shop/HNC/Rigid_Tapping_3.html > > http://www.wallacecompany.com/machine_shop/HNC/Rigid_Tapping_1.html > > http://www.wallacecompany.com/machine_shop/HNC/Rigid_Tapping_2.html > > > Wow that is a neat tool turret. It changes fast. > > One thing that jumps out at me is that it seems your accelerations on > X/Z are extremely low. It looks like it takes an inch or more to get > up to your rapid speed.
That's correct. I seem to recall that I had to balance between acceleration and tripping the following error alarm. I should probably go back and optimize my tuning sometime (after I start making money). > If accel really needs to be so low you should try starting the tapping > move way outside the part (an inch) or tapping at very low rpm and see > if that helps. It's possible it hasn't settled into sync with the > spindle quite yet, when it's cutting the first couple threads. > > You are using a sprial point (if thru hole) or spiral flute tap (if > not) right? I am using a new uncoated spiral point with a hollow spacer and collet stop. I did find that the spacer and stop gets loaded with chips and needs to be cleaned out for each part. > On Wed, Jul 02, 2008 at 04:29:10PM -0700, dave engvall wrote: > > Chris, > > Any chance that what Kirk is seeing is the same as the problem on the > > Mazak and could be fixed in like manner? > > Kirk and I talked about the importance of cranking up the SERVO and > TRAJ rates and I think he is running both at at least 1kHz now. Any > slower just isn't enough to get a nice synchronized reversal. > > Chris Oops, by the time I got out to the shop, I forgot about the rate corrections. Still, I think g33.1 is working well as is with a .1" to .2" lead-in. I think the problem is inherent with the tap or fluid I am using. The more I think about it, the more I think running a second g33.1 to chase the thread is the way to go. To be honest, I really can't tell the difference between the double g33.1 parts and the hand chased parts. I suppose I should tap a part on my manual lathe for comparison. -- 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) ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
