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Rambling and rubling in Mill/drill spindle

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Suzuki4evr

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#1
Quick question. My mill/drill spindle rumbles quite a lot at certain speeds but not always. Is it definitely the spindle bearings or could it be something else also. Just want some info before I start stripping. I had a smaller type mill/drill before with the same problem and replaced the bearings with no improvement as I recall. That's why I am asking.

Michael
 

tweinke

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#2
Slop in the drive spline?
 

Suzuki4evr

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#3
Possible. So that means I must make up a new spline I guess. If that is the case, it is going to have to wait a bit sadly. I have so much projects to get to plus work. Thanks Tweinke
 

lordbeezer

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#4
Guessing you've checked bearning adjustment and lubed same
 

Suzuki4evr

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#5
No not yet. I haven't stripped or anything I am just getting my mindset ready for it.
 

mikey

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#6
What kind of mill do you have? If Asian, most of them will have a spindle and a drive sleeve and you will get rumbling if the bearings for either one are bad.
 

Suzuki4evr

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#7
I have a A&S milling drilling machine. Think it is British. I will post a pic tomorrow. Maybe on of our British members can tell if this is true
 

Chuck K

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#8
Belts?
 

Suzuki4evr

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#9
If you say "belts",are you asking if it is driven by belts or are you asking if that is producing the rumble? If it is the latter, well no that is not where it comes from. I can clearly hear it from the spindle and like I've mentioned it doesn't rumble all the time.
 

Suzuki4evr

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#10
What kind of mill do you have? If Asian, most of them will have a spindle and a drive sleeve and you will get rumbling if the bearings for either one are bad.
Here is the pics of the machine Mikey.
20181029_075718.jpg
20181029_075921.jpg
20181029_081905.jpg
 

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Suzuki4evr

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#11
Slop in the drive spline?
Tweinke,I have thought about your proposal last knight and this morning I checked the spline slop. When I hold the pulley and move the spline spindle form side to side,there is definite movement,about 0.35mm or 0.013" . But how much is too much,my head says there must be some clearance. How much is just enough?
20181029_081919.jpg
20181029_083128.jpg
20181029_083249.jpg
 

mikey

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#12
I'm going to guess it is an Asian import. The design suggests that and the round plaque that says, "The place for spindle's adjustment" just sort of sounds like Chinglish to me. If that is the case then it probably has two tapered roller bearings supporting the spindle inside the quill and two radial bearings supporting a drive sleeve at the top of the spindle. The drive sleeve transfers radial motion from the belt to the spindle.

I suggest you check the run out of the spindle. If it is greater than a few tenths then you might consider changing the bearings. Also grab the pulley and see what happens to the run out when you move it back and forth. If the run out increases significantly, the drive sleeve bearings are shot.

If this is an Asian mill then there isn't a whole lot inside the quill - just bearings and spindle in the quill and two bearings supporting the drive sleeve above the quill. Changing them is simple and I cannot think of anything else that would cause the machine to rumble unless something is rubbing on sheet metal on top.
 

TomS

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#13
What Mikey said but also take a look at the draw bar to spindle bore clearance. My RF-30 Enco mill draw bar had so much slop that the spindle vibrated in the highest RPM setting. I figured out that when tightening the draw bar it would move to one side of the spindle bore thus being significantly off center causing vibration. I made a bushing that was a snug fit in the top of the spindle with just enough clearance for the draw bar. Problem solved.
 

tweinke

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#14
The spline slop was just a thought, some guys with Shoptask 3 in 1 machines have had that problem. I had a knock in my Shoptask spindle and was able to pull the drive pulley and move it on the splines and get a better fit. Temporary repair I know but I don't use the mill part much anymore after getting a stand alone mill.
 

Suzuki4evr

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#15
I
What Mikey said but also take a look at the draw bar to spindle bore clearance. My RF-30 Enco mill draw bar had so much slop that the spindle vibrated in the highest RPM setting. I figured out that when tightening the draw bar it would move to one side of the spindle bore thus being significantly off center causing vibration. I made a bushing that was a snug fit in the top of the spindle with just enough clearance for the draw bar. Problem solved.
I had a RF-30 and it had that problem. I will check and maybe implement your idea on this machin if necessary. Thanks
 
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