The Shop > Tools
Any idea why this lathe is chattering? Spindle bearings?
jb3cx:
I think I would agree with john about using a back centre ,and try different speeds ,that's a fair lump of Steel hanging out of the chuck
Peter
Pete.:
Put a DTI on the chuck and wrench the bar up and down. If it moves the DTI your problem is in the bearings. Where did you get the spec for the pre-load? My 280 is set by running the lathe at high speed and measuring the headstock temps.
Arbalist:
--- Quote from: loply on January 02, 2016, 01:22:22 PM ---Tried everything - all the same result - two types of carbide insert, HSS, really sharp HSS, and sharp brazed carbide...
Best results came from tools with big back rake - like 35 degrees - but these won't last on steel. Still could only take 3 or 4 thou without chattering.
--- End quote ---
But what is the tool in the video?!
chipenter:
I recently had to scrape my compound slide to my toolpost . as there was a gap at the front of about 1 thou made a big diference to the finish .
SteveT:
Looking at your video the chatter is uniform along the length of the bar, and the tool looks like its about 10mm wide and flat to the cutting surface the tool should have a clearance rake so you are only cutting at the tip.
1/ have you assembled the taper bearings correctly I think they should be back to back? also depending on the bearings set-up are the bearings cross located
that is the bearing assembly needs space to expand as it heats up, a common fault on newly assembled bearing units is the shims are but in the incorrect place
so locking the bearings.
2/ From the video the lath sounds very rough which points to the head bearings
If you could post an assemble drawing of the head it would help a lot.
Hope this helps
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