Axis Motors Brush replacement

[Delw]

The motors I have on my fadal has tach brushs and motor brushs.
On the old acrolocs if you didnt have clean segments the motors would jump when in Slow feed mode. I am having the same problem on my fadal in the "Y" but only sometimes. looking into the motor brush holes the segments are dirty so I am guessing the tachs are dirty as well and the brushs need to be replaced.

Now the fadal main motor brushs are very easy to replace, however the tach looks like you have to take the metal cup off in order to get to them to replace them.
Anyone have any tips?
I've replaced brushs on about every machine motor out there but never a fadal.
It has glenteK motors

I am thinking that this has something to do with a motor overload error get when trying to thread mill ( yeah I am still fighting this issue too)
however watching the following error I think this may be part fo the problem

http://www.cnczone.com/forums/showthread.php?t=59126

Thanks
Del

[carbidecraters]

I love it when a guy can fix his own stuff. I have found that when the brushes are bad the bearings are all well and that can lead to the main windings rubbing on the case and give your card a run for its money. I used to tinker with the motors but now I send them in because the cost of a tach and the liability. I wonder if I have a breakdown of a motor here.

[Delw]

Yeah I am going to check bearings and all when I pull it.

I used to be the one that fixed all the machines at the shops i worked at along with my fulltime gig of being one of there machinest. I got hooked up with a dealer for Hitahi sekie in the 90's and did some trouble shooting for them on there lathes as well.
Remember I am the guy who blew up Literally a brand new hitech 20s when they first came out ( post a while back) I rebuilt it from the ground up all spindle mechanicals over a 3 day weekend before anyone showed up to work that following moday morning. I guess it was my calling LOL

[carbidecraters]

I looked but I couldnt find a breakdown schematic. You will have to do what I did and just tear into it.

[Delw]

Thanks Anyway.
I will tear into them one of these days soon.

[Delw]

Yesterday first thing in the morning( right after the above post), the belts went out Go figure on a friday none the less.
I was set to order some belts( cause I can never get them in town) and while waiting for a call back I called fadal. which theygave me a number and they had them instock here on a truck.

tech dropped them off in 20 mins.
when he was here I mentioned I was going to replace brush's, he was nice enough to show me a motor in the van and how to due the tach brushs but said you don't need to replace them as its not your brushes its the resolver.
I was telling him I was getting a following error of .08-.125 on my "Y" we ran a quick program to veryify it.
I figured the tach brushs were the cause for the error#12,
he was teling me he very rarely has to replace tach brushs. and they are a pain in the butt. he showed me the motor brushs and they were the same size as the ones I had in the motor in length( I thought they looked short they weren't).

he also showed me how to clean the tach with an eraser and electrical tape on the motor. due to very little room and dont take anything off but the main motor cover.

so in the next few days I got to get a resolver, I have some here at the shop from my 1990 fadal but can't remember if they are bad or not so I will have to find them and check them. ( back in 1997 when I bought a 1990 fadal I bought all new resolvers and a spare to have on hand and replaced them wether they needed it or not. so I may have some good ones here.)

We going to be moving again (ugh) into a another place once our landlords get it cleaned out and a meter put in, then he comeing by for the day to due complete service work for us.
seems when I bought this supposibly complete rebuilt machine last year it wasnt Completely rebuilt like they claimed and since I don't trust what the people ho told me said, I want a fadal service guy to give it a complete run down as I can't afford the down time.


Oh yeah back to belts and worth the mention. if you have a aircleaner make sure you run it on your spindle motor and if you don't have one put one on. I didnt have mine on for the last 6 months cause I was lazy.
I run a 4" face mill at 9000 rpms that causes some mist the mist is sucked in by the top of spindle motor then goes through the spindle motor and out the bottom were your belts and pulleys are.
when I took the motor apart it was a sticky mess and I couldnt understand why as I cleaned the crap out of it 8 months ago to were it was spotless.

when the tech handed me my belts he looked at the machine and said "DUDE put that fram airfilter back on that machine and your belts wll last longer" he said "you probaly run a face mill and if you do thats why your belts went bad so fast".

one other thing, the next time you "think" about ordering some spare parts like belts just to have just incase. do it why your thinking about it don't wait. Wife and I were just talking about ordering spare belts just incase on wednesday. well the just incase happend on friday. LOL

[scadvice]

Thanks for the feed back. Another post for the back of my maint. manual.!!
Steve.

[carbidecraters]

Pro-active!!! Words to live by!

We sent a spindle motor out for cleaning after looking at what face milling had done to it and after the cooling fan was installed upside down....LOL. I have been thinking of making up a bunch of top covers for our fadals.

[Delw]

I made top covers for all my mills long ago(old shop) they work pretty good but you need to run an exhaust in there cause when you open the door it all comes out.

for an exhaust all you need is a 12 inch fan run through some 10-12 in duct and a few air filters, if you are running oil, DON"T exhaust it outside you will get fined big time by the EPA. we always ran coolant and they will clog the filters

[timo2le]

Based on these posts, I should install an air filter on top of the spindle motor, and the fan should be pulling air through the filter, and pushing it through the motor.

Please confirm, thanks. My fan is blowing upwards.

Tim

[carbidecraters]

Originally Posted by timo2le Based on these posts, I should install an air filter on top of the spindle motor, and the fan should be pulling air through the filter, and pushing it through the motor. Please confirm, thanks. My fan is blowing upwards. Tim

Tim you may find that you will get some resistance to flow because the cavity is so tight in the motor itself that it will feel like the fan is blowing out rather than blowing in (down). It is best to have a filter (car air filter) on the top of the fan. It saves the motor and spindle drive.

[scadvice]

...I just replaced my fan and the Housing , spindle air filter. It's the cover for the filter it cost $88 Don't lose it! Also not of this forums current talk, but if there is anyone is having problems with a sticking ATC check the Idler, PN ATC-0169. It is common for these to rust up and not turn making the changer hesitate and stick. A 25 to 34 buck item depending on who you order it from.
Also if you put your hand down by the bottom vent openings on the spindle motor you should feel air coming out. If not, the fan is backwards.
Steve