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Topics - DAlgie

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21
G-Code, CAD, and CAM discussions / G71, G73 lathe roughing cycles
« on: July 29, 2006, 01:27:37 AM »
Is there any interest in writing a wizard for these two lathe roughing cycles? G71 is a really nice general non reentry roughing cycle, G73 will do a reentry, like a spool, etc. I have been using Surfcam to write the G code for this, but honestly it's a pain to work with, and am guessing that most of the CAM programs around aren't much better as they are all targeted for mill work. Just a thought....

22
General Mach Discussion / Limit switch issues
« on: July 22, 2006, 12:32:53 AM »
My lathe has it's X axis home/ limit switch at the end of the axis' travel. The Z axis one is somewhere in the middle of it's travel. My problem is, when I go to set home with both, the Z axis will go there, then reverse off and stop, with no problems. The X axis however, when it goes there, then reverses, I get a limit switch triggered error, and I can't jog or go anywhere anymore. I have used a workaround in tabbing to the jog flyout screen, then switching off the limits override button, then jogging off, then switching the limits override back on again, but it shouldn't be like this. Any ideas?

23
Show"N"Tell ( Your Machines) / My new (old) lathe almost complete
« on: May 13, 2006, 01:26:46 AM »
Thought I'd post a couple of pics of my lathe as it is, most of everything is done and working, just now need to machine all the turret toolchanger parts, the wiring and everything is ready for it to bolt on. This lathe uses a 400oz/in stepper driving the X axis through a 2:1 reduction belt, plenty of power there. The Z axis is a 1200oz/in direct drive, it's marginal in power but I still have some drag to deal with yet. Both ballscrews are 5 turns per inch. Uses Gecko 201 drives, 34 volt power supply from a 500VA torodial transformer, PDMX 50 volt AC/DC converter- power conditioner, Cambell breakout board, huge fan cooled gecko heatsinks. Stainless sliding half cover for coolant and chip control makes it really nice and cleanup easy. Computer/ worktable cart is an old Indy car shock dyno cart that was perfect for this use. I still can't believe how much equipment, gears, feedscrews, front apron, threading gearbox and assorted crap I had to ditch off that wasn't needed anymore, you'd think that the ballscrews, steppers and electronics would't be much more, if any, money to manufacture and add for a low cost commercial CNC lathe. And without all that mechanical stuff the thing runs so much quieter now! Been a really fun project but I need to get back on the aircraft stuff...
    Dave.

24
General Mach Discussion / Home switch position
« on: April 29, 2006, 09:35:31 PM »
I looked through other posts, but, is the home position, where you reference your machine from, always at the end of the axis? What I'm asking is, can a home position be located in the middle of a travel, or somewhere along it? My lathe has a reasonably long bed, and with a low pitch ballscrew it is a ways to go to get a reference point, if the home position was able to be set closer to the work area it might be a nice feature.
                                DaveA.

25
General Mach Discussion / Lathe turret toolchanger
« on: March 06, 2006, 05:36:47 PM »
In the process of converting my 13 by 40" manual lathe to CNC control, I am considering building a turret toolchanger for it. probably a disc type with 5 or 6 tool stations. I would drive this with a geared down stepper motor, and lock it with a solenoid- pin arangement. The pin would also have a microswitch to tell Mach3 that the change is complete and to continue on with the program. Questions are; what capability does Mach3 have for this? I would drive the stepper in certain increments to the next tool needed, this would obviously change as a multiple of the station seperations if the tool needed was not the next one on the turret. Would need to set timing to unlock the pin, determine that the pin is actually unlocked, then drive the stepper to the called out tool station, then stop there and plunge the pin back in and determine that the pin is locked. So, two microswitches for both lock pin positions needing two data pins in the parallel port, and drive the stepper motor certain amounts of steps. Possible? Thanks in advance.

26
G-Code, CAD, and CAM discussions / G71, G70 roughing, finishing lathe
« on: February 06, 2006, 01:31:58 AM »
Hello. All my turning files are from a Fanuc OT control, running a Clausing storm lathe. The G71 is a good roughing cycle, and the G70 is usually used for finishing after that. In addition, G73 is a roughing using a reentrant cycle. I tried to run these programs in Mach3, and realised that it didn't have these cycles. I read the PDF files for turning, didn't find a roughing or finishing cycle. Anyone have an idea of what cycle I need to do this with? Or, is it reccomended to just program it with CAM? Thanks.

27
General Mach Discussion / Risk of non isolated breakout board?
« on: December 24, 2005, 11:35:05 AM »
Hello, I have a new chinese router that I am thinking of converting to Mach3 control, it has a breakout board in it right now that has no optoisolators on it, just direct connection. I will buy an isolated breakout board, probably from PMDX at http://www.pmdx.com/PMDX-122/ but would like to test it now before I go that route. Am I running a big risk in connecting the machine up to my PC like this? Anyone have any real examples of torching their PC with destructive feedback, or is this just an urban myth? Thanks to all, merry Christmas!

28
General Mach Discussion / Using machine PC to run other stuff
« on: November 10, 2005, 12:46:46 AM »
Hello, I haven't as yet run this software on my new CNC router (Haven't actually taken delivery yet) but it looks like it will be nice stuff. A question I have is, what other software might possibly have conflicts to it, I use some average and higher end CAD stuff, and is it advisable to run it while the Mach3 software is actually controlling the CNC? How about software that loads icons on the right side of the Windows toolbar, this is typically programs that are running in the background, should I try to not have any of those programs on this machine? PC is an XP1900, 256 meg RAM, ATI 64 meg video card running two monitors, one is a touchscreen on the CNC.

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