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Spindle noise questions Enco 100-1525 / Jet JVM-836

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lens42

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#1
I recently got an Enco 100-1525 2/3 copy of a BP mill (appears to be the same as a Jet JVM-836. At some speeds and when loaded, I'm hearing rattling noises from the head. When the head is tilted, the rattling gets worse. When I got the machine, I ran it over all speeds (3500 max) and everything seemed quiet, but I didn't actually cut with it. I tried measuring lateral movement while pushing sideways on the spindle and I get literally zero motion, so the spindle is not sloppy in that way. Also. the highest speeds (3500 rpm) are quieter than some of the lower speeds if that helps.I supposed this means new bearings.

Is there anything else that could cause this noise? Is there an adjustment? If new bearing are in order, is there any place where I can get pics or instructions of how actually remove and replace the bearings and what to watch out for? I may be in over my head here, not having done this level of repair before, but if you guys can supply some guidance I'm hoping a careful newbie can handle this.
 

RWL

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#2
Make sure the drawbar is not rubbing inside the spindle where it seats. I made a washer for between the drawbar and the spindle that has a little narrower part that sits a short distance inside the spindle to keep the drawbar centered.
 

8ntsane

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#3
Not knowing your mill, by the top speed of 3500 suggests it is a Vari speed head. In that case you might have a look into that. It is common in Bridgeport machines to have the plastic bushing go bad.

As already mentioned, the draw bar could also be a source of noise as well. To check, Remove any tooling from the spindle, including the collet. Remove the draw bar from the machine, and run it at any , or all speeds the machine had made noise before. You may just be lucky enough to have the draw bar rattling around off centre, and machining up a washer to help keep it centre would be a easy fix.
 

lens42

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#6
Are you talking about the splines?
No, I mean the oil cup on the left side of the head. I also put some heavy gear oil down the splines, but spindle oil in the cup cleared up the noise first. On my previous mill, the spindle bearings were (sort of) permanently lubed, and a cup in a similar spot was only for the up/down motion of the spindle. At least that's what I thought it was for because any time I put oil there, it all ended up on the table. It took me a while to figure out that cup on this machine oils the spindle bearings.
 

GT Mills

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#7
WHat kind of oil should I fill the cups with on my Enco 100-1525?
 

lens42

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#8
I've been using "Mobile Oil No. 10 Spindle Oil Medium".

I actually still have the original rattle noise on all but the lightest cuts. Cut quality is not affected so I never dug into it except to determine it's not the drawbar. It sounds like it may be an upper bearing near a pulley. I also still don't see how oil gets from the cup on the head to any place useful. It seems to mostly drip out the bottom and spray around when the spindle turns, but I put it in anyway.
 

lens42

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#9
If you mean the cups at the back of the knee, and not the one on the spindle head, I use way oil: Mobile Vactra Oil No. 2 Way Oil Medium


Sent from my iPhone using Tapatalk
 

sanddan

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#10
My Jet JTM-4VS mill calls out "Mobil DTE Oil Light, or equivalent" and to service daily. I fill it every time I use the mill as mine can sit for a couple of weeks idle sometimes and get drained out. Cheap insurance.
 

lens42

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#11
@sanddan Do you find that oil drips down to the spindle nose and flys off when it's spinning? That's what happens after I fill the cup and wonder if oil really is going where it should inside the head.


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sanddan

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#12
After sitting for a few weeks I've had the bearings make noise if I didn't add oil. If is has sat for a long time I wait a few minutes before running it.

The oil dripping from the spindle doesn't bother me at all.
 

GT Mills

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#13
I am having serious problems with the spindle slop moving .035" up and down. Absolutely zero slop raidial direction, this is an axial direction problem only. Say I move the handle to bring the tool in contact with the work, it would start to cut on contact. Now let's say I lock the spindle position there with the machine off. Unlocking the spindle, tool still in contact with the work piece, I can push down on the spindle lever lightly and although the mill end is at the same location on the work piece, I can move the handle and watch the scale move another .035" down! I can't find any adjustments nor understand what holds the bearings in place. WHat do you think, do I need to replace bearings or is there a cheap way to get this slop shimmed out of the spindle? I have checked the tightness of the spanner nuts top and bottom, that doesn't seem to be a problem and although the top spanner nut did turn in about 1/2 thread it did nothing to take out any slop. I have a little intermittent noise in the upper bearings, even though I made a centering spacer for the draw bar. Any suggestions much appreciated guys!
 

JimDawson

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#14
Just to clarify, is the spindle moving or is it the quill? The spindle is inside the quill. Just want to make sure we are talking about the same part. What you describe sounds like normal backlash in the quill rack & pinion. If the spindle itself is moving inside the quill, then that would be a serious problem.
 

Silverbullet

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#15
If you dont have a manual , look at grizzly site for there copy of the mill. On there dimension page has pdf downloads free. Should show if there adjustable take up for the bearings. I have the enco mill like yours but havent had a chance to even try it out, hit with three bulging discs and the pain has stopped me but good. But im trying epidural shots two already no relief yet.
 
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