Messages

81

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: April 30, 2012, 03:58:09 PM »

Why do you say they could not be reused?
Were they knackered or?
Hood

The drivers/amplifiers could not be reused for Mach3 (or at least with technical skills).  The Medas CNC controller interfaced to them over a address/data busl.  I could not remove the driver high speed electronics (encoder feedback) from the high power amplifier side. 

However, I was able to sell the the integrated 3 axis driver/amplifier on ebay and pay for 2 of new servo motors and drivers!  LOL

82

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: April 30, 2012, 02:53:11 PM »

Curious JH, where are you with the progress of your DM 4800 conversion?
Thanks
Marty

SLOW....  Been busy with other stuff.  

The servos could be reused but it was the amplifiers that could not.  So, for me, its easy to replace the servo and amplifier with a new matched set that has step/dir control from the get go.

Thanks
JH

83

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: February 08, 2012, 10:44:05 AM »

Joel,

Are you going to use a spindle mounted encoder to orient the spindle for the tool holder locking lugs or
are you planning on another method?
Thanks!

Keith

The current plan is to use the built-in encoder on the spindle motor with the stock FREQROL-SF VFD Drive.   

The original FREQROL-SF VFD had a SF-DA (Speed Reference and Magnesensor Card) to interface with stock MELSAS CNC Controller and stock Magnesensor.  Since the MELDAS CNC controller is being replaced with a Mach3 PC, this SF-DA interface card has been removed from the FREQROL-SF VFD SF-CA mother board and the Magnesensor will not be used. 

To date I have successfully removed the SF-DA card and updated the jumper settings and parameters on the SF-CA mother board to test the unit in a Stand-Alone Mode.  Using simple dip switches to test and interfaced to an old wire-harness, I can take the unit out of eStop to charge up the DC Bus and turn on the spindle fan, enable to unit, run forward/reverse, and adjust the speed with a 10K potentiometer. 

The same wire-harness has connections for spindle orientate switches and its position location is configurable with parameters on the FREQROL-SF VFD mother board.  I have not prototyped up the connections or studied the parameters to test.  I am hopeful that this will work…   I need to get a large block of time allocated to fully study this and test at one time.

Thanks
JH

84

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: February 07, 2012, 05:17:35 PM »

Just a quick update on the ATC Carousel, schematic attached.

85

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: February 03, 2012, 10:45:42 AM »

Got the new circuit built and installed to control/interface with Mach.  The ATC Carousel is now functional (again).  Initialization (find home), Increment and Decrement Macros are up and running.

The new 3/8 tubing and quick release pneumatic couplers have also been installed to fix all the air leaks.  New solid state relays are now controlling the 3 pneumatic solenoids for ATC RAM, Draw Bar and Tool Release/Air Blast.   The macros from the BP412 Project have been modified to work with ModBus for this control.  I’ll add some pics when I can.

Next up: Spindle FWD, REV, ON, OFF, SPEED Control and ATC Orientation

Thanks
JH

86

Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit

« on: January 27, 2012, 05:26:23 PM »

Looks great!  Keep the pics coming.

JH

87

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: January 24, 2012, 01:52:56 PM »

The new AC motor gear box combo was installed onto the ATC carousel.  Bolted up nice and works great!  Tested it with an orange extension cable and was able to change directions depending on the starter cap connection.  Next step, create an interface circuit for Mach and test.  (should of done this the first time, spent way to much time on the stock 4 wire ATC motor…)

Thanks
JH

88

Show"N"Tell ( Your Machines) / ATC Motor Mount

« on: January 23, 2012, 10:30:59 AM »

I got the new ATC Motor mount machined out this weekend.  The stock gear box is on the right and the new mount is on the left.  This will allow us to connect the new AC motor gear box combo to the ATC carousel hardware.  I should have it connected up and prototyped in a day or two.  Then create to final circuit and interface it to the ATC Macro and Mach Software.

Thanks
JH

89

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: January 19, 2012, 04:01:01 PM »

Well the ATC Motor and/or Circuit has failed...  I have a 5 AMP fuse for the AC side and this keeps popping, even when replaced with a 10 Amp.  The relays are also sparking like flash bulbs.  So, my plan moving forward is to replace the motor with a simple AC Motor and gear box.  I have pulled the old motor off and created an adapter to link the the new AC motor to the ATC  (15mm to 0.500 shafts).  Working on a new base plate for the now.  Hope to have this back up and running reliable soon.

Thanks,
JH

90

Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion

« on: January 17, 2012, 12:42:19 PM »

Got some time to work on the mill again and did some additional servo tuning.  I think its solid now, strong and fast, 520IPM with 60 on the acceleration for X and Y.  So the XYZ is marked as completed, if I need to go back and tweak I can.  Below are the servos mounted on each Axis and a Video of all 3 of them in action. 

<a href="http://www.youtube.com/v/GUHi6zB0nkY&amp;hl=en&amp;fs=1&amp;rel=0&amp;color1=0x006699&amp;color2=0x54abd6&amp;border=1" target="_blank" rel="noopener noreferrer" class="bbc_link bbc_flash_disabled new_win">http://www.youtube.com/v/GUHi6zB0nkY&amp;hl=en&amp;fs=1&amp;rel=0&amp;color1=0x006699&amp;color2=0x54abd6&amp;border=1</a>

Thanks
JH