What's the rpm on the spindle? This is where you might benefit from using gears or a timing belt to increase the torque, but you will loose your speed. Stepper start loosing torque around the 500 rpm range generally. At least we know now that the 387oz range motor is too small.
You might want to check your bushings on your z axis and make sure that they are not oversized and causing the z axis to bind up more than it should. I've seen a couple of the Z-axis where if you removed the lead screw, the router would not move up or down. There is a fine line between slop, freely moving and binding. Hopefully Art can guide you on the threading. I'd would like to see a sample g-code for the spirals that are not using g01 to make the move. I have assumed all along that a threading cycle could be used. Thanks for the update and video! -Tim ----- Original Message ----- From: "Chainlink" <dustinyo...@hotmail.com> To: "Legacy Ornamental Mills" <legacy-ornamental-mills@googlegroups.com> Sent: Friday, August 19, 2011 4:58 PM Subject: Re: Build log of sorts for a 1200 upgrade to CNC > I had my first success today with the upgrade. Here is a link to a > video of the carve in action! Sorry about the loud volume; I wasn't in > the mood to edit the video. > > http://www.youtube.com/watch?v=vlQ46e3gwiA > > Details: > > I needed some 1 1/2" dowels for my newest table project, so I decided > to try my best to use my CNC upgrade. I had problems in two areas: > First, my Z-axis stalled when raising. Second, I had to make shallow > passes to keep from stalling the A-axis. One thing I did notice was > that as the motors warmed up, my z-axis was much better behaved and > seemed to work well. > > I spent just about 8 minutes per dowel once I got the procedure down. > I even bumped up the A-axis motor speed and ran it so that I could run > some sandpaper over the finished dowel--it's pretty nice to be able to > do that. I must say that I absolutely loved the ease of repeatability > that the CNC commands provided. My Z axis held it's depth without > having to constantly fiddle with locking down the Z axis on every > depth change like I used to do. Small changes to depth are really easy > to make. I ended up just where I wanted to be with my dowels, a bit > undersized at 1.48" to 1.49". > > Although I spent most of my evening in the shop, I feel like my time > was at least equally spent vs. manual milling without the added > frustration and effort. It was nice to prepare the next blank while I > was waiting. Next up, the big timesaver would be to cut my threads via > CNC. I don't know where to start with that one, if anyone has any > tips. > > -- > You received this message because you are subscribed to the Google Groups "Legacy Ornamental Mills" group. > To post to this group, send email to legacy-ornamental-mills@googlegroups.com. > To unsubscribe from this group, send email to legacy-ornamental-mills+unsubscr...@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/legacy-ornamental-mills?hl=en. > -- You received this message because you are subscribed to the Google Groups "Legacy Ornamental Mills" group. To post to this group, send email to legacy-ornamental-mills@googlegroups.com. To unsubscribe from this group, send email to legacy-ornamental-mills+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/legacy-ornamental-mills?hl=en.
