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Messages - garyhlucas

221
General Mach Discussion / Re: Inconsistant ATC Positioning
« on: March 09, 2017, 08:02:30 PM »
I think your problem is real simple. You have a code block for every tool position. While G90 is modal and stays in effect if your progrsm uses a g91 anywhere your macro will fail. So just two things you need to check. Issue the G90 before every move in each of the 8 tool blocks of code. Then make sure each code block does a G0A0 for tool one, G0A45 for tool two, G0A90 for tool 3 and so on.

I see there is also code to reverse the travel direction for 2 degrees probably to set your position against a hard ratchet stop. I can't quite see how that works with a stepper motor as I think it could cause the motor to lose a couple of steps each time and the position will walk off over multiple tool changes. Might need to remove that code from each tool block if that happens.

222
General Mach Discussion / Re: z axis wont move up but will move down
« on: March 06, 2017, 06:31:55 PM »
If the motor isn't making bad noises then you likely lost the direction input to the drive.

223
General Mach Discussion / Re: Inconsistant ATC Positioning
« on: March 06, 2017, 06:29:58 PM »
G90 is absolute and is modal (stays set) G91 is incremental and is also modal.

224
General Mach Discussion / Re: Cnc router motor upgrade opinions
« on: March 04, 2017, 10:40:54 AM »
Yes the motor inductance is the key factor in speed. When I built my machine I bought the lowest inductance motors I could find. Mine came from Primopal. Also have the leadshine digital drives.

225
General Mach Discussion / Re: Cnc router motor upgrade opinions
« on: March 02, 2017, 10:33:42 PM »
My homebuilt mill has a 67 volt linear power supply at 20 amps powering 80 volt drives for 960 ozin Nema 34 steppers driving 5mm x 20mm ball screws. I have it set for 3000mm/min but it runs fine at 4500mm/min no missed steps. 1500 rpm from the motors is pretty decent.

226
General Mach Discussion / Re: Inconsistant ATC Positioning
« on: March 02, 2017, 10:24:04 PM »
Turrets have rotational inertia. You could be loosing steps because your acceleration setting is too high. Try a low setting and see if the moves become consistent.

227
General Mach Discussion / Re: Cnc router motor upgrade opinions
« on: March 02, 2017, 05:21:57 PM »
What rrason for an upgrade? What is your power supply voltage? What is the voltage rating of the drivers? The motors may not be your weak link.

228
General Mach Discussion / Re: Inconsistant ATC Positioning
« on: March 02, 2017, 05:18:46 PM »
Are trying to rotate the turret in incremental mode or absolute? If incremental repeating A360 should cause a complete revolution each time in the same direction. If absolute mode and you are somewhere other than 360 it should move to 360 the first time you input A360 and not move the next time because you are already there. A45 in incremental moves you by 45 each time. A45 absolute takes you to 45 from wherever you are. Doing it again produces no motion.

229
Yes our Servo 5000 controls work. However the 5000 doesn't use conventional servos. It uses variable reluctance steppers and the drives are really strange beasts. The machine was converted from a DOS based controller to Windows by the previous owner and they couldn't get it work afterwards. So we bought it as a blown control. Got it to our shop and plugged in all the cables and it worked perfectly!

230
General Mach Discussion / Re: simple VSD
« on: February 27, 2017, 02:24:33 PM »
All VFDs offer functionality you'll never use, its only software. You only set them up once and virtually all have simple settings already set. So if it runs I'd stick with what have. If you need setting help I can likely help you out, I've worked with lots of VFDs. If their VFD instructions are anything like their PLC instructions I can understand your confusion!