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Re: Emco PC Mill 55

Ludvig Friberg
 

I have the VMC-100 and I think it is similar when it comes to rigidity? When cutting 1075 steel for example my limit at 3 mm DOC at 2000 rpm on a 10mm 4 flute mill is 1.5 mm engagement and a cutting speed of 180mm per min. I tried going over 2 mm load and the spindle stalled. 

Surface finish is nice, no chatter from the machine.

Den fre 24 juli 2020 kl 09:45 skrev David Rabenius <taborboy78@...>:

All of these machines had ballscrews from the factory. The F1P had more powerful steppers & spindle motors. The controller was more Industrial and ran on 3 phase power vs. the standard household 110 current F1 cnc. I dont know if the F1P had beefier ballscrews or not. Spindle speed was higher on the F1P. They also made a F1 woodworker with 10,000 rpm spindle, these are rare to find today.


Re: Emco PC Mill 55

David Rabenius
 

All of these machines had ballscrews from the factory. The F1P had more powerful steppers & spindle motors. The controller was more Industrial and ran on 3 phase power vs. the standard household 110 current F1 cnc. I dont know if the F1P had beefier ballscrews or not. Spindle speed was higher on the F1P. They also made a F1 woodworker with 10,000 rpm spindle, these are rare to find today.


Re: Emco PC Mill 55

anders.s.larsson@...
 

Hi David,

Thanks for the thorough answer. Yes I believe this to be a complete functional system including computer and a control console. I have not had a chance to check it out yet in person and I’m not sure I’ll be given the opportunity to run it.

I realize that machining steel might not be the intended purpose of this machine. I’m mainly trying to get an idea of the rigidity of the machine and wether that or the spindle power (or both) might be a bottle neck.
What about the lead screws are they acme or ball screws? If I understood it correctly that was one of the differences between the F1 and F1P for instance.

My main purpose of getting this machine is to learn more about CNC without having to convert an existing manual mill as well as machining small parts in brass and possibly steel for hobby purposes. However, the parts need to be quite precise so that’s why the accuracy is of interest too.

If anyone knows where I could find the documentation for the PC Mill 55 that would be great too.

Thanks!
 Anders 


Re: Emco PC Mill 55

David Rabenius
 

Anders:
  First things first. The Mill needs to have the RS422 interface card in the PC. Then you need the MSD disk with the factory parameter settings & WinNC software, all of these need to be included or you have a heavy paperweight. If you can see the machine running in person then even better. These machines need older Computers to run, depends on which year the Machine was made. The interface card you need is a RS422 and is proprietary to the EMCO machines. They are hard to find today as most people just upgrade the controller to modern electronics.
  Next you have to realize its a SMALL machine with limited horsepower. Made to a standard quality and used with modifications in the computer industry (chip unzip) were chosen due to the high accuracy of the base machine. This is NOT a production machine and cutting steel is going to be slow. These machines were designed for training so they never were designed for high speed production. The 55 series had higher spindle speeds than the 50 series. These are some of the best tabletop machines made, that machine could have hit $17,000 - $20,000 when new. Is the optional control console included? they can be run off a standard PC keyboard.
   The F1 mill was the origional CNC mill and as computer technology progressed were upgraded. The next machine after the F1 was the 50 series. WAY more useable than the F1. They used 5 phase steppers and had basically the same frame as the F1 This machine used the RS485 card and relied on Window 98 operating system. The 55 series were introduced in the late 1990's and offered higher feed speeds, higher spindle speeds and more coding functions. The one after that was the Concept series, these machines were made with a larger enclosure that prevented one from getting it thru a standard door. There was a 7 station toolchanger option available along with the interface card integral into the machine. These machines used an Ethernet connection to a standard computer. 


Emco PC Mill 55

anders.s.larsson@...
 

Hi,
I’m thinking about bidding on a PC Mill 55 which seems to be in original working order. I have a hard time finding out what to expect out of the machine. Is it possible to do meaningful machining of steel for instance? What tolerances are to be expected (depending I wear etc of course)? Also, it would be helpful to understand where this fits in the range of Emco mills from the F1 mills and upwards.

Any insights are highly appreciated,
 Anders


3.5 inch floppy drive controller

Keith
 

Hi All,
I recently bought a Mk4 compact 5 cnc lathe which is fitted with a 3.5 inch floppy drive instead of the usual tape drive.
Unfortunately the floppy does not work.
All the manuals that came with the machine only have instruction for the tape unit.

Does anyone have a schematic or any details of the floppy drive interface or how it is controlled.

Keith


Re: SOLVED: Compact 5 CNC Feed Speed slow in Hand mode

newagedesire@...
 

Not sure what the noise is, but there seems to be a surge/pulse that matches the speed of the axis.  My first guess is it is a hardware issue.  This thing hasn't been moved or lubricated in at least a decade. My other guess was there might be a slight interrupt in the drives as it updates the DRO.  I'll have to check and see if it is present in CNC mode. Any ways, I made the first cuts with it today and it doesn't seem to effect the cut quality. 


Emco F1 post prcessor

gonzalezpineiro@...
 

Hello
I am using MFI to program the Emco F1 milling machine. I would be interested to know if there is any MFI compliant post processor.
On the other hand, has anyone used the EMCObasic CAD / CAM?

Thanks

--
Hugo González


Re: SOLVED: Compact 5 CNC Feed Speed slow in Hand mode

J G
 

No problem - glad it is fixed.
I forgot about the trimpot :-(

What is the "pulse" issue ?


Re: Stepper Only Move Fast, Can't Move Slow - Compact 5 CNC

newagedesire@...
 
Edited

I had a similar problem and posted the solution here:
https://groups.io/g/Emco-CNC-Users/message/7272


SOLVED: Compact 5 CNC Feed Speed slow in Hand mode

newagedesire@...
 

I got it sorted!  This 10K pot was the problem. I didn't notice it until I pulled the board out. It is in series with the main pot and is used to calibrate the actual feed speed to match the dial on the panel.
 
This 10K ohm pot was testing at 500K ohm in the center of its sweep.  This caused the Resistor/Capacitor circuit for the 555 to be super slow.  Surprisingly the computer still accepted the delayed pulse rate and ran the axis at roughly a tenth of the normal speed.

It is adjustable from the back of the board through this hole. 

I actually managed to find a 10K pot on hand I could make fit. 

The drives/axis still have a bit of a pulse that I didn't notice while running in CNC mode.  That may require further testing but for now I am happy to be back up to speed.

Thanks for the help JG.


Re: WinCam for AC88 controller needed

Constantine Christophi
 

Not for the compact 5, but I can take code from the LinuxCNC post processor and hand edit it to work on Fanuc 0. It's slow going and tedious but perfectly usable with some time.


On Sun, 12 Jul 2020 at 15:28, <kikaaa.juric@...> wrote:
You are using Fusion360 Post processor for EMCO Compact 5?


Re: Compact 5 CNC Feed Speed slow in Hand mode

J G
 

Yes, its only the user variable jog rate between 'single step' and 'rapid'  that uses the pot/pulse circuit. Otherwise the velocity and acceleration  is handled by the CPU. Seems an odd fault to occur spontaneously unless it is a aged capacitor.

Definitely worth having the boards out to get eyes on, IMO. It's easy enough but a pain refitting due to space and access restrictions. Unlikely to be contamination but even heavy dust - esp around workshop activity - can upset digital circuits, I've found.  I use a dry paintbrush to clean them - although in fact the commonly recommended way of cleaning very dusty old boards is washing with (fairly pure ) water ! Very thorough drying obv.

The timer IC is near the bottom by the amplifier board connectors and the PROMs. Sadly all the board components are inaccessible without removal.

Happy probing.
Regards JG.


Re: Compact 5 CNC Feed Speed slow in Hand mode

newagedesire@...
 

Thanks this narrows it down a bit while confirming some of my suspicions.  The resistance on the pot is good through the whole range and it doesn't seem to have any connection issues at the board.  Sounds to me like the other parts of the timer circuit might be to blame.  The circuit seems to be partial working as the pot still varies the speed it is just very slow.  The ratio in the voltage divider or capacitor charge/discharge rate seems to be off.  It does seem to rapid fine as well when holding the rapid button and +/- buttons. I'm not sure if that narrows the circuit down anymore...

I'll try blowing it out, but the case is very clean.  If that doesn't do it I'll pull the boards and get a look at the capacitors and check the resistor values. 

Thanks,
Steve


Re: Compact 5 CNC Feed Speed slow in Hand mode

J G
 

The drives are controlled by the CPU on the main controller board. The stepper windings are driven by the power amplifiers according to I/O line signals from parallel interface interface chips (6821 / 6520 PIO) in turn according to a sequential bit pattern from the CPU - whatever mode the machine is in.

In 'Hand' mode the CPU detects the +/- key taps and advances the pattern. When the +/- is held beyond a certain time the CPU uses pulses from a 555 (or equivalent) timer IC via another PIO. The 555 pulse rate is determine by an R/C (resistor/capacitor) circuit containing the jog speed potentiometer.

From what you say I understand the machine moves correctly in 'CNC' mode and also jogs one step per tap of the +/-.
That implies to me the CPU is reading the +/- buttons correctly and the drive circuit is good but that the pulse train is not correct.

My first test would be that the pot is in good order and that the connections to the board are ok. Pot spindles (knobs) can get bashed by mishandling leading to poor internal connections and/or the pot can come loose on the board which leads to poor/broken connections.
Less likely, any metal chips which may have found their way in to the main board past the shielding can also cause problems.
Regards JG


Compact 5 CNC Feed Speed slow in Hand mode

newagedesire@...
 

I have a new to me Compact 5 CNC in the 5xxx serial range that has a bug I'm trying to locate. 
Feeds on both X and Z are running very slow only when in hand mode. 
Max speed is 2" per minute when the pot is set at the max setting.  Speed is still variable.
Single taping the X and Z buttons work to move each axis a step at a time.
The rapid traverse speed works fine.
Both axis work correctly at all feed speeds in CNC Mode. (eliminating the stepper driver circuit in my mind)
The speed adjustment pot checks out a from 0-98k ohms.
I have 13v and 50v at the 5 power pins for the steppers.
I suspect there is something after the pot but before the stepper driver circuit that has malfunctioned.
Does anyone have experience with the control circuit in hand mode?
Hoping someone has sorted a problem like this already.

Thanks,
Steve


Re: WinCam for AC88 controller needed

kikaaa.juric@...
 

You are using Fusion360 Post processor for EMCO Compact 5?


Re: PCmill50 programming errors

Al Cost
 

I have a complete good running set of emco pc 50 mill and lathe with computers for sale. $4500Inline image

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Re: Emco Turn 50 Error 6013: MAIN DRIVE NOT READY

Pmecnc
 

Code 6013 could be bad power supply.to the main drive both 24 & 5 v or mains. Bad connections in plugs. bad transistor that get hot and are thermaly protecte take a look of link pdf codes are the same. From what you describe it sound like thermaly & or the motor drive shutdown because of low voltage/higher current


Re: PCmill50 programming errors

David Rabenius
 

Arjan Dijk:
  Thanks for the help. I am adding N numbers now and will run the program to see how it works. If I can repay the favor to you let me know.

Dave

On Wednesday, July 1, 2020, 08:35:43 AM EDT, arjan.dijk <arjan.dijk@...> wrote:


I used CIMCO to Convert, it uses IJK instead of R. Hope it helps

Arjan Dijk