The Shop > Tools
The Sajo mill is here
Trion:
Today, I tried filming the head noise. The audio is pretty bad, but the noise of the horizontal spindle is like a light whine, as from an electro motor, in comparison to this hammering/crunching sound. :poke:
Bluechip:
Trion
Does sound a bit gruesome .. although it would be about normal for a Chinese Mill :lol: :lol:
Try turning the spindle by hand, if it's rough, maybe just a shot bearing .. not good if it's gear driven though ..
Wonder what others think ...
Dave BC
Artie:
--- Quote from: Bluechip on May 24, 2010, 04:52:07 PM ---Trion
Does sound a bit gruesome .. although it would be about normal for a Chinese Mill :lol: :lol:
Dave BC
--- End quote ---
I know nothing about the Sajo, obviously, but I do have a chinese mill and yes it is a noisy geared head machine but...... nothing like that!
That does not sound good.
Im thinking about dismantling mine as its been said that a decent bearing set can radically reduce the noise... I would definately be looking inside yours before something nasty happens..... looks like too nice a machine to waste.... :wave:
Rob T
Trion:
Todays shop time revealed that things are worse than I initially thought.
I spent some time listening to the various places on the machine, to locate the hammering sounds. The gearbox makes a loud hammering noise in the higher gears, and the upper part of the quill head does the same. I cannot feel any bearing wear, so I'm afraid it's the gears.
But I have two heads for the mill, so I figured it might be worth a shot to try the other head on. So off came the heavy bastard..
While changing heads, I started the vertical motor without any load. All of a sudden, the gearbox was quiet and only made a light whine as I would think was normal.
But when I put the angled head on, the hammering sound from the gearbox was back. But the head didn't hammer, instead it made a deep rumbling sound.
Then I noticed the play in the spindle....
Yup, thats about 0,72mm (0,03") of radial play :jaw:
Well, leesson learned (for the hundreth time), you get what you pay for.. :bang:
Both vertical heads and the vertical gearbox need an overhaul. Bearings will be ok, but replacing gears might be a costly story! On the other hand the horizontal spindle and transmissions seem fine. But considering how worn the vertical spindle is, I'm beginning to wonder how drastic the wear on the ways might be. If the table doesn't move straight, even light precision work is out the window and i might aswell use an angle grinder instead... How do I measure the table wear?
I seem to have to make a decision wether to sell the machine as it is, or to start an expensive and time consuming overhaul. Any opinions? :scratch:
Bernd:
That .030" might not be that bad. It depends on what radius your checking it. I'm sure if you check it on a 12" distance from center your indicator reading would be much more.
Have you tested the machine under a cutting load? Like perhaps milling a part to see how the noise is then. Might sound completley different under a load.
I personally would say it's the bearings and not the gears.
Bernd
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