Not sure about the spindle noise but are you aware of the USB port to floppy 
emulators?

I fitted one to my Prototrak and it works well. Restricted to 1.44mb though.

Look at this on eBay
USB Floppy Disk Reader Drive Emulator 3.5in No Extra Driver Required Plug N Play

Pete 

> On 30 Dec 2021, at 19:05, Todd Zuercher <to...@pgrahamdunn.com> wrote:
> 
> Here is an off topic (not Linuxcnc related) general milling machine question.
> 
> About 10 months ago we (our company) bought our first real metal working cnc 
> machine.  It is a Lagunmatic VMC 3516 with a 4th axis, and Dynapath Delta 40 
> control, built in 1998.  We bought the machine hoping to use it as is, but 
> with retrofitting to Linuxcnc as the plan B.  At first we weren't sure if it 
> would run.  Some other people here hooked it up and played with it bit to see 
> if it was working.  But they were stumped by it, and didn't have a lot of 
> time to put into figuring it out.  Well this week I finally had a little time 
> to look into it.  After a bit of fiddling it seems it is fully functional.  
> Once I figured out how to home it, and command tool changes and start the 
> spindle.
> 
> I have no experience with metal working machines, but lots of CNC experience 
> working with wood routers (large industrial wood routers, not just home hobby 
> machines.)  While the basic CNC principals and are the same, the actual 
> hardware is very different.  For example there are worlds of difference 
> between a 15hp hi speed wood working router spindle and this VMC's low speed 
> multi gear milling spindle (5 or 6,000 rmp max speed I think.)  For starters 
> I was amazed by how much mass seems to be in the spindle to turn it by hand.
> 
> I have no basis for comparison as to how this spindle and it's gearbox should 
> sound, to try to judge it's condition.  The control seems to automatically 
> shift the gearbox dependent on the commanded spindle speed.  I can hear air 
> cylinders shifting things, and the sound of the spindle is very different 
> when commanded at S1000 vs S5000.  At the lower speed it obviously has a lot 
> more gear noise.  At the high speed there isn't the gear noise, but it has 
> sort of a "loose" sound.  But it doesn't ever seem to have any really 
> objectionable bad bearing sounds, at least to my untrained ear.  How should 
> it sound?   Any hints for assessing it's condition?
> 
> We don't have much for manuals for the machine.   Looking at the option page 
> display on the control, shows that the rigid tapping option is enabled.  
> Unfortunately it looks like the only way to get code into the old control is 
> by RS232 DNC, or floppy disk.
> 
> Todd Zuercher
> P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
> 630 Henry Street
> Dalton, Ohio 44618
> Phone:  (330)828-2105ext. 2031
> 
> 
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