The Shop > Tools

Help with alingment of head stock

<< < (3/5) > >>

nickle:
There is a good technique that will let you use the bar as is and evaluate your headstock alignment. Do a quick google for rollies dads method lathe alignment. The process is less dependant on precision alignment of the item in your chuck or headstock taper.

Regards,

Nick

Pete.:
If you've checked the test bar then the first thing you have to do is get it running true in the taper. As I said further up you can have a perfectly good test bar and a socket that dials true but still have the bar running out if the interface between them is not perfect. Any dirt or dings will make it run out.

You might be able to improve the runout by setting the bar in firmly with a drift.

Check the socket at two different depths to make sure it's running co-axially with the spindle. If you can, run the lathe slowly and sweep a DTI up the taper very slowly to see if it kicks or jumps, indicating a burr or ding (or embedded swarf) in the taper.

Blue the test bar taper up (or use magic marker in a pinch) and set it in the socket, as Joules said above. If it doesn't fit perfectly it'll only remove the blue in a couple of tiny spots.

Until you get this test bar running true you are wasting your time checking alignment, it will always yield a false result.

lilyies:
Pete have blued and checked the contact on the taper about 95%
I was thinking the spindle may be bent. But both ends of the spindle
run true.WTF

Joules:
As has been said, some pictures would be very useful now. Did you remove the spindle and bearings from the headstock during refurbishment ?  Is the preload set, if not tighten it up some more and test. If you put a tool in the taper and push pull can you feel any movement or clicking as you rotate by hand.

I just read your introduction, do you have a model engineering society near by or know anyone else with a lathe.  Be as well to get a second "Hands On" opinion as we are all second guessing your skill level and abilities.

lilyies:
Joules I have not got a lot of machining experience but I have worked
with and around machinery all my work life.I am a am a rigging supervisor
on dragline builds so do a lot of work aligning big electric motors gearboxes large boring
bars ect.

Navigation

[0] Message Index

[#] Next page

[*] Previous page