Happy the hear it worked out.
You're going to be a CNC tech before it's over
Problem solved (with fingers crossed); turned out to be pretty easy, even for a novice like me. After studying the schematics some more, I realized that the same 115V connection to the thermal switch also connected with the ATC relay board (pdf page 104, schematic page 11, CN2 on lower right of board). Not coincidentally this board controlled the two motors for the ATC that had been disabled. I traced the cable from CN2 to the terminal block that tied it with the thermal switch and removed it, then threaded it directly to the transformer secondary connection that I had removed. This bypassed the thermal switch (for the time being) and brought it back to being isolated from the machine ground. Once I completed that, everything initialized finally.
Case closed on this issue. Time to move on to the next part of the project.
Dan
Happy the hear it worked out.
You're going to be a CNC tech before it's over
Sorry I'm late to the party, been very busy and CNCZONE is not notifying me of new replies to the thread despite me being subscribed.
Good you have the spindle running! Not so good the bearings are noisy. Indeed, will be interesting to hear what pair of wires you disconnected and where they go.
So, you have the isolation transformer powered up?
Marty
Hey Marty-
It's looking more and more like I'll be 'Frankensteining' the two machines into one good one. There's no question about the bearings, spindle makes a lot of noise! I removed and replaced the spindle cartridge just as a 'dress rehearsal' for when I have the riggers once again provide power for the stored machine and remove the spindle from it and put it in the home machine. I know that spindle is good because I've heard it run several times and never noticed anything. So at this point I'm kinda resigned to having one good machine, and one to provide spare parts and eventually discard as scrap iron I suppose.
Did you take the belt off the spindle to see if it wasn't the spindle motor?
Replacing the spindle bearings is likely doable....
Marty
Yeah, that was the first thing I checked was the motor or the spindle. It's definitely the spindle--when I had it on the bench just turning it by hand I could hear and feel it. I did contact DM and talked to Roberto--he gave me some procedural instructions which involves an oil pressure injection to pop the top off to get to the rest of it. There are three at the spindle nose and one at the top. He had the 3 lower bearings in stock for $150/each, but not the top one. I think it's only one or more of the lower ones, but won't really know until I actually attempt it. I'll set it aside for now and if the time comes when I really need it I'll do something about it then. Right now I just don't want to spend any more than is necessary to get it going.
If I don't have to cannibalize the other machine too much I could eventually work on getting it back into operation as well. Right now I've got the servo amp out--during my adventures with that I fried a circuit board component--doesn't look bad at all and I'm sure that can be repaired. With that and the spindle I (will) have two items from the other one, and at the moment I'm not seeing anything else I need out of it, so maybe in the future I won't need to do that much to get it going again.
If you're interested in sending the spindle out for rebuild, I used these guys to do mine. Home Their website is a bit lacking, but they do good spindle work.
I had them do the 5 bearing upgrade to my BP clone spindle, very satisfied with the job. The total was about $900, including a #30 taper regrind. I think the standard rebuild is about $600.
Drhanger,
I've been reading over you post. You are in the Phoenix area? You should be talking to this guy: mc-machine.com - Home His user name on this forum is "Capri". He has a few of these DM440M machines. Plus he used to work for DynaMechtronics as a repair tech. He has helped me many times on this forum.
Oh, and back to your original question on Phase converters..... I use a 5hp to run mine. works fine, except that I can't turn on any other equipment in the shop. too much voltage drop.
Good Luck with you machine. I have a DM440M, and for the past two years it's been a dead horse, collecting dust.
Bill K
Just as a note of caution, when you're swapping parts to make one good machine out of two, the three ball screws are fitted to each machine uniquely.
If you take the Y ball screw out of one machine and tried to fit into the other, the bolt holes will sort of line up but not 100%
And when you start the machine back up, it makes horrible noises.
Trust me on that one.
However the balls screw assemblies are pretty easy to service.
So is the spindle motor. I've rebuilt two of mine already.
Super smooth and quiet with new bearings.
Timothy
Dyna Mechtronics DM4400, HAAS VF-0E, HAAS Mini Mill
Hi Tim,
Were you able to pull the armature out of the housing to service the bearings?
I'm having some surges and can actually see spikes on the load meter.(with no real load on the spindle) I'm trying to figure out where to start looking. Arcing on the commutator or perhaps an issue with the Tach?
Yes, I totally disassembled the motor. Getting the tacho feedback armature out was the tough part.
I had surges and intermittent running on my spindle motor too. Traced it back to the driver and a bad switching relay.
Timothy
Dyna Mechtronics DM4400, HAAS VF-0E, HAAS Mini Mill
So Dan, where are you on your DM4400 projects?
Marty
Hey Marty--
I've been working on removing old electronics, etc., and researching what I want to put in. I've been in talks with Arturo at CNC4PC and putting together a shopping list. I've also talked off and on with Timothy (2ferrous) by email, who has been helpful with some things as well. I have considered a few times starting a build log, but I haven't seen a lot of activity in this DM forum so didn't really think there would be much interest. What do you think, should I do it? I wouldn't want to continue in this thread, especially since it's gotten so far afield from the original subject line. As you already know I'm pretty weak in the electrical dept. so a build log may generate enough interest to get some input on that part, but I wouldn't want to do it just for that, I'd like it to be of interest and help to others with this machine. I just didn't think I would really be contributing much (although making mistakes is always interesting, or at least entertaining, for others, and a good learning process, LOL).
Of course you should start a build log, I for one would be interested. Also it would give me a chance to contribute or at least confuse the issue.
Well, I hope I can make it interesting, and would love to have you along for the ride, Jim (and anyone else). I'll see what I can do to get started in the next few days.