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Windows 7: File Corruption During Network Transfer


24 Mar 2011   #1

Windows 7 Professional 64-bit
 
 
File Corruption During Network Transfer

My company computer (hooked up to our internal network;no homegroup) has just had a fresh install of Windows 7 Pro 64-bit. I went through the process of mapping network drives and had a problem when it came to connecting to IP addresses and folders in the format of '\\server\shared folder'. Turned out that I had to change a security setting. Following the instructions on this site, I was able to resolve that issue.

These network locations are CNC machines and the files that I am placing on the machines contain CNC code (G&M code and X, Y, Z values for 3D machining). Basically, G&M code cannot have multiple X, Y or Z values on the same line (it wouldn't make sense to go to two X locations in the same move). When I transfer CNC files from a network location (all of our files are stored on a server) to the CNC machine, they occasionally get corrupted where part of one file is contained in another file.

I have tried transferring one at a time and in bulk, both with the same result.

Does anyone have any insight into this problem? I am going to continue exploring potential fixes and will post updates as I find things. Any help would be appreciated.

My System SpecsSystem Spec
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24 Mar 2011   #2

Windows 7 Professional 64-bit
 
 

UPDATE

I tried turning off Remote Differential Compression to see if there was some data loss during the transfer, but this did not help.

Still searching! :-)
My System SpecsSystem Spec
24 Mar 2011   #3

W7 Professional x64
 
 

If it's possible, could you copy one of the files from the server to your machine, and then try transferring it to the CNC Machine?
My System SpecsSystem Spec
.


24 Mar 2011   #4

Windows 7 Professional 64-bit
 
 

Good suggestion. I moved one of the files that I had attempted previously onto my desktop and then transferred it to the CNC machine. Fail. I then wanted to make sure that I was actually overwriting the file on the CNC machine during transfer, so I renamed the file on my desktop and tried again. Fail. I put the original file from the server on to a thumb drive and loaded the file from the thumb drive on to the CNC machine (it has a USB slot for doing this) and that went well. The CNC file loaded fine and was verified on the CNC machine as being a good file.

It has something to do with Windows 7 communicating to the CNC machine over the network. Something is happening during that interaction that I know very little about!
My System SpecsSystem Spec
25 Mar 2011   #5

Windows 7 Professional 64-bit
 
 

UPDATE

I have tried this same CNC file on multiple CNC machines with different version operating systems (all same brand: Haas) with the same result. I have also tried from a different PC running Windows 7 with the same negative result.

Still searching!
My System SpecsSystem Spec
25 Mar 2011   #6

W7 Professional x64
 
 

So, what do you think at this point? It sounds to me like a network issue. What networking hardware is between you and the CNC machine?
My System SpecsSystem Spec
25 Mar 2011   #7

Windows 7 Professional 64-bit
 
 

It's definitely a network issue. The pieces of hardware that are between my PC and the CNC machine are:

MyPC -> two or three switches -> modem on CNC machine.

I realize that this is not as specific as you would like. I just spoke with an IT person here and we were talking about ways that we could trace the route of the file over the network or just hooking my PC straight to the CNC machine to rule out any hardware in between.

The file that I have been transferring always increases in size once it has been placed on the CNC machine. Information is not being lost; rather gained.
My System SpecsSystem Spec
27 Mar 2011   #8

W7 Professional x64
 
 

Do you travel through a router, or anything else, or is it all internal switches?

Also, the file size increase may be due to the CNC machine uncompressing it, or things like that. I would suggest start by connecting to a switch as close to the CNC machine as possible (maybe directly into the modem), and see if it works. If it does, trace your way back to the next switch, and repeat until you're sitting at your desk, or have isolated the problem.

I'll bet you a billion confederate dollars that the problem lies with the device that's doing the digital to analog conversion for your CNC's modem. Intuition is telling me that it needs to be either rebooted or replaced.
My System SpecsSystem Spec
28 Mar 2011   #9

Windows 7 Professional 64-bit
 
 

WebMattR,

I have a request in to the IT department to look at the network hardware.

A possible related issue has popped up. I have been using my computer for CAD work again and the software has a network license that it loses on a regular basis, which did not happen when I had WinXP installed two weeks ago. This could be related to the switches that are being used and not related to the CNC network hardware...or it could be it's own little problem! I did call the CAD software company and they told me to look at our internal network, FWIW.
My System SpecsSystem Spec
28 Mar 2011   #10

W7 Professional x64
 
 

Well keep us up to date, and I'll help you as best as I'm able.
My System SpecsSystem Spec
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 File Corruption During Network Transfer




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