Messages

51

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

« on: August 24, 2012, 02:21:09 PM »

Good catch!  Its an addjustable pressure switch to let the control know that Air is available.  

I removed it from the system as only the ATC and Draw Bar needs shop air and these faults are captured and mitigated in the ATC software control by insuring each Home and Extend operation completes before the next step.  Just trying to keep the fault logic simple.

Thanks
JH

52

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

« on: August 23, 2012, 01:32:37 PM »

Real Quick:  This is some before and after pics of the ATC pneumatic hardware.

JH

53

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

« on: August 23, 2012, 01:23:38 PM »

Yep, 3 parts.  Its too big for the BP412 to cut all at once and this save a little on material.  Its 7075 0.125 think.  Got the MGP, eStop and Button cases installed below:

Thanks
JH

54

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

« on: August 22, 2012, 06:15:09 PM »

Quick Pics of the control panel covers cut.

JH

55

Show"N"Tell ( Your Machines) / Control Panel

« on: August 21, 2012, 12:12:50 PM »

I found the old CAD files for the control panel used on the BP412 project.   Made a new fixture plate and have started cutting out the bezel plates.  Been collecting up all the new Buttons, MPG Wheel and eStop, LCD, and KeyPad hardware.  Should be starting on the sheet metal and mounting hardware in the next couple of days, its going to be interesting on how it will come together and get mounted onto the Machine…

The goal is to make it the same as on the BP412 (shown in picture), just make the sheet metal box a little thinner.

JH

56

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

« on: August 20, 2012, 02:07:21 PM »

Finished up the paint on the Front Doors and some little details around the Z Servo Mount along with the casting between the electronics and the machine enclosure.  The only thing remaining is the Spindle casting and cover.

Also, we got all the plastic windows looking like new using 3M rubbing then polish compounds with the DeWalt buffer (this is an old picture from the BP412 project)

The Y Axis rear way cover is still giving me some trouble…  I have beat and cut and welded on it like crazy, its close but still needs more attitude adjusting.

Next up:  Get the doors mounted and working smoothly, then onto the control panel.

JH

57

Show"N"Tell ( Your Machines) / Re: 1987 Bridgeport Production Center Interact 412 to Mach3 Conversion

« on: August 17, 2012, 04:17:30 PM »

I guess I never posted the schematic to the circuits that I made to control the servo with Open Collector vs Line Driver Interface.  Agreed with Hood, Line Driver is better, but if your using PP like I did, Open Collector will work just fine.   Your limited to 200Khz, but you can’t even get close to that with Mach3 and your PP

To convert 5 Volt TTL to Open Collector, you can use your basic NPN transistors or 74LS05 IC.  See the attached circuit diagram, this is what I have used on both the BP412 and the DM4800 to Servo Interface.  I’ll have to dig into the Servo Book to see my notes on all the connections used, but at least this shows STEP, DIR, EN and eStop back from the Servo Interface.

JH

58

Show"N"Tell ( Your Machines) / Re: 1989 Bridgeport Interact 412 Retrofit

« on: August 02, 2012, 06:49:29 PM »

So I'm assuming that means the spindle only turns 1500 max rpm and through the belt ratio it can achieve 10K? 

This means the AC Spindle motor and ALL bearing in the spindle noise are rated for 10K !!!  Nice....   Your VFD will adjust the frequency to the 3 Phase Spindle Motor to control the RPMs.  The number of poles will determine the frequency to RPM ratio.

The Spindle Motor on my 412 has 4 poles  (ie 100Hz = 3000RPM, 200Hz=6000RPM ), simple calculation will get you 10K

Again, 10K ROCKS

JH

59

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

« on: August 01, 2012, 02:41:11 PM »

Pete,

Nothing like a stock working machine!  Keep it stock until it breaks.  It is nice to be able fix it when it breaks, but I would cross that bridge after it breaks, then consider a conversion.

When I added the new servo motors, I simply drilled and tapped new mounting holes into the cast iron using a drill template to get the holes centered.  See attached.

As far as the tool changer software, that is easy...  Just break it down into small parts, ram out, ram in, draw bar up, draw bar down, ATC Home, ATC Left, ATC Right and Machine Tool Change Height, Spindle Orientation…  Once you have these functions in place, you apply the macros from my BP412 or DM4800 project for your tool changer and your done!

JH

60

Show"N"Tell ( Your Machines) / Re: 1989 Bridgeport Interact 412 Retrofit

« on: July 30, 2012, 01:58:53 PM »

Thanks and I know it's going to be alot work but I enjoy tinkering with machinery.  I found the same Speedstar VFD that you went with on ebay for $950.00.  Is this in the neighborhood of what you picked yours up for.  Also I had a question on the servo's did you use the stock brake or go with the optional brake they offer with the teco servos from machmotion.  That's pertaining to the Z axis of course.  I was doing some more research on line about the factory specs of this machine.  I couldn't find anything "official" from Bridgeport, but I did find other people selling the same year machine.  They all say the spindle is 10hp and go up to 10,000 rpm.  Does this sound right as I know you said yours would only go 6,000 rpm.  It also says the stock rapid speed was 472 ipm.  I remember reading your post and you were saying yours came stock with somewhere in around 300ipm.  Did they advance the machine that much in 2 years or is the resellers information incorrect.  I was also thinking maybe there was different optional equipment available at the time of the original purchase.  Any thoughts on that.  Thanks

I got my VFD at for 800, but that was a long time ago...  
driveswarehouse.com/p-2124-pc1-75.aspx

Yes, use the stock brake on the Z.  Its a simple 24VDC solenoid (i think)

Check the motor plate on the spindle, it will indicate the MAX RPM for your machine.

Look n good !

JH