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Personally, I would check for spindle heat. Sounds like you may be sweating in a holder after it cools. Typical lower spindle bearing failure. Could also be a few other things.
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Anyone else have issues with this? I'm fairly certain its not drawbar related. It seems occasionally (not all the time) the holder gives a real loud pop when it is removed. Its a CAT40 taper and i double checked that the correct pull stud is installed. One time the machine actually pulled the tool through the tool changer clip, cause it didnt release in time. I tried scotchbriting the tapers (factory reccomendation) and wiped down with a little bit of air tool oil. It helped a lot but after heavy cuts or sitting for more than 5 minutes in the spindle i sometimes still get sticking.
Anyone else have these issues?
Personally, I would check for spindle heat. Sounds like you may be sweating in a holder after it cools. Typical lower spindle bearing failure. Could also be a few other things.
there is absolutely no heat at all. machine and holders are also virtually brand new
Has happened to me to on multiple different machines. I just make sure I keep the holders clean and spray the tapers down every few days with wd 40. That usually keeps them from sticking.
Judleroy
I've had the same issue...and when it pops it sounds like something has to be breaking!
I think there's 2 factors at work, one being the shrinkage with cooling, but the other being possibly the same effect you get when you wring to gage blocks together.
I try and keep my holders and the spindle clean (with a Weenie) and very lightly lubed, it seems to help. I also keep an eye on my air pressure and filters.
Check the air pressure on the tool release cylinder. We had a similar problem on one machine and the only way we could solve it was to put a small air tank teed into the line just ahead of the solenoid for the tool change cylinder. This stopped the pressure dropping as much during the changer operation.
Another thing we have found is that some tool holders are worse than others and the problem is made worse if they are used for prolonged heavy cutting. We simply use these holders for drills or taps whenever possible.
An open mind is a virtue...so long as all the common sense has not leaked out.
ok, so i guess this is slightly common. i watched the air guage and it drops about 5 lbs during a tool change. The lines are pretty small dia so i don't think this is a problem. I did see some fretting on the holders especially the sticky ones, but most of it was real light (came off with a scotch bright pad) Maybe I'll try penetrating oil vs the air tool oil and see how that goes.
I had a problem with the black oxide on some tool holders. The black stuff transferred to the tapered bore of the spindle. Had to clean the tapers regularly. After that, shiny tapers only, no more black oxide or whatever that stuff was.
Dick Z
DZASTR
what type of holders what type of machine?
reason I ask is I have a batch of holders that do this in my haas and they also do the same thing in my fadal but not as bad.
the holders were bought from US shop tools cant remember the name.
once I bought kenemetal holders I havent had the problem.
the holders were nothing but a nightmare in the haas, the fadal they worked fine( and have for 15 years until very heavy cuts. I even have a er 30 holder that does it when drilling anything bigger than a 5/16" drill in the haas.
I junked most of them and replaced them, only have like 18 left.
I've bought a lot of stuff from USSHOPTOOLS, and for the most part have been very happy with their parts, service, and prices. I did notice that some holders (Cat40, Fadal 4020) would 'pop' louder than others, and never really thought about the brand. Something to pay attention to, now that you mention it. ... I should know better too.Originally Posted by Delw
One thing I noticed is that I don't care for the Parlec stuff that much. Seems like it's very good quality, but for some reason I don't like it..?? Can't put my finger on it.
One other thing to note, for others just tooling up with ER series holders... the nut is different on different brands, so you end up needing a different spanner.
i have GS holders (supposed to be balanced to 20,000 rpm) in a Milltronics RH machine. They went all day today with only one stick, and that was when we breaked for 15min?? just drilling and tapping though
All my holders for the 1st 15 years came from US shop tools, never thought I had any problems. then I bought a new haas and had nothing but problems. changed holders to kenmetals and the problem went away in the haas.
so in playing I tossed in a few on the fadal and they can better, Running better meaning no popping and heavier faster cuts with out hearing it cut.. 30+ cat 40 holders take a while to replace lol.
Kingston and parlec stuff give me the problems. kingston the worst for chatter parlec for popping I buy some stuff from US shop tools but will never buy any holders unless there kenmetals. and believe it or not kenmetals were cheaper than us shop tools.
I still think my fadal has a sloppy taper cause its a well used machine and thats why its more forgiving than the fadal.
I have one small issue with the haas that I am still working on but got around it using only specific alum endmills for alum. my fadal I can throw anything in there and it makes a nice finish at any speeds and feeds.
with the kenmetal holders vs kingston on the fadal I increased my feed on one part from 50ipm at 8500 rpms to 85ipm at 8500rpms with a 3/8 endmill and the finish is almost glass and you cant hear it cut except for chips hitting enclosures. 1/2 depth of cut full width
Delw
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