- Nov 8, 2013View Source
My bouncing baby Sherline (4100) lathe is running great! It is already upgrading itself with new tooling. 1st off the press is a SWEET lathe depth stop with interchangeable tips. Way cool, so far all programming has been through wizards and hand coding. Accuracy and surface finish are amazing. I have finished my homing and limits arrangement which includes a tailstock flag to stop the saddle BEFORE it tries to push the tailstock, and a moveable chuck end limit to avoid any possibility of a chuck crash. The X axis has both homing and far end limits! I have accomplished all of this with only two optical sensors! They are both mobile and mounted to the saddle, very cool setup. Two questions I have for the group… When I’ve ‘Homed’ the machine and then generate code from a ‘wizard’ I get a message ‘softlimit warning on X+’, it isn’t programmed to go anywhere near limit switches so I say ‘continue’ and all goes well. Also still looking for a leg up getting started with Dolphin’s Partmaster Pro, I still need a working Postprocessor and maybe a sample file that works with mach 3\Sherline. (Sonny, You still out there??)
I went through the exact same journey went I set up Partmaster a few months ago. To compound the issue, mach3 seemed to change how it handled the G43 command between versions. I'll send you the post processor that I use and try to take some screenshots of my mach3 config tonight.
When it comes to threading, you have the choice of g32 or g76. If I recall correctly, the mach3 wizards used g76 while partmaster used g32. Both methods work, but each has quirks. I updated the postprocessor to use g76, but I didn't have a chance to test it out :)
Keep in mind that you should have spindle feedback as a closed loop when doing threading.
Lastly, I use a combination of a QCTP and gang tooling on my sherline lathe. The QCTP is primarily for turning, facing, boring, etc. I use the gang tooling setup for drilling (rather than using the tailstock). It all works seamlessly, but you really need the offsets to make it all work.
Sorry that I haven't gotten back to you, but Halloween is a big occasion for the kids :)
On Thu, Oct 31, 2013 at 3:33 PM, David Lorenz <dlorenz147@...> wrote:
Answers to many questions!
1st off Thanks to all who responded, I am quite comfortable with mach3/milling but brand new to my 1st CNC lathe!
Answer 1: Yes the machine runs perfectly with hand coding, mach wizards, and Cambam files. I have simply been unable to produce usable gcode with Dolphin’s Partmaster lathe.
Answer 2: I tried switching values in the threading wizard (to cut internal threads) got error messages about x start <= xend, so no code. Will try again though.
Answer 3: I was looking for an init string that would return mach lathe to its startup condition. The G80 default init string is not enough to cancel all the crazy modes triggered by gcode. Each program or test leaves me in different modes (and headed for trouble).
Answer 4: I Will be starting to plug in Tool lengths in my mill this weekend, I will do extensive testing with and without a G49 (cancel tool length offsets) before the toolchange.
And Another question: I have huge problems with mach wanting to do ‘preparation moves’. Whenever I see this popup I now read it as “wouldn’t you rather I crash your machine or tooling before we proceed”. When I read the numbers in the popup box they are spot on for where the machine should go but… then it Always does something unpredictable (like trying to jam my flycutter down an inch into my workpiece)! Can these preparation moves be eliminated? I was just trying (for the first time) the ‘remember’ and ‘return’ buttons in mach’s tool info window, jog to a location, hit ‘remember’, jog elsewhere, hit ‘return’ (the screen button not the ‘enter key) and bam preparation move, the numbers say where it is to go so… hit the ‘ok’ button and.. big flowery plunge crash move, then it goes where expected. What the? Particularrly the z axis seems to want to go to zero then to its target. Cancel is no help because it cancels the whole move not just the preparation move. I often set z0 to the mill table so this is a HUGE problem for me.
Are you able to use Mach3 by itself, with a simple handwritten program?
I'm just finishing my Sherline 4100 CNC lathe conversion!!! Yeah! I just received the last pieces of the puzzle, some optical sensors that I'm setting up for homing and limits. I used Sherline's official conversion kit as well as their new anti backlash nut kit for lathes! Very cooool. I have lapped the ways, tightened the gibs, and calibrated this thing to a 'T', and now... time for some kind of software. I am trying Dolphin Partmaster lathe and having no luck getting started with it. Tool paths are all wonky and sometimes nothing at all shows up in mach 3 toolpath display. I've tried all the included postprocessors as well as 2 additional 'updated' versions sent to me by Dolphin. I would love to hear from someone who is using this software with mach 3, as to how to get started and solve the post issues. Note: wizard files, Cambam files, and hand coded files all run properly on this machine. Please help!