headstock runout

[Veritas]

I am having difficulty holding a wheel arbour in my lathe to repivot.It is a 8 mm Peerless lathe.Today i put a test indicator to check the spindle.It is out about.006 inches.This would account for the wobble i would think, when i tried to run the lathe and saw the wheel with arbour move.
My question i guess is would you think this is too much runout to repivot with?
The problem i found is the back adjusting nut will not tighten so i would think the thread is stripped.
I think more than likely i will have to get another lathe.
Thanks for any ideas and answers to this. :smile: http://i74.photobucket.com/albums/i244/veritasottawa/img_0000.jpg

[Veritas]

I am having difficulty holding a wheel arbour in my lathe to repivot.It is a 8 mm Peerless lathe.Today i put a test indicator to check the spindle.It is out about.006 inches.This would account for the wobble i would think, when i tried to run the lathe and saw the wheel with arbour move.
My question i guess is would you think this is too much runout to repivot with?
The problem i found is the back adjusting nut will not tighten so i would think the thread is stripped.
I think more than likely i will have to get another lathe.
Thanks for any ideas and answers to this. :smile: http://i74.photobucket.com/albums/i244/veritasottawa/img_0000.jpg

[Bill_NY]

Yes.
The spindle and/or nut could probably be repaired or made.

[Veritas]

Bill more than likely the repair would cost me more than what i paid for this lathe.So thinking maybe just keep this one for odd jobs like polishing.

[Bill_NY]

Probably right. Besides all of us would like an excuse to buy a new tool!!

[David Robertson]

Are you sure it is the headstock and not the collet or chuck?

David

[Veritas]

I put the tip of the indicator on the spindle with no collet.It makes sense as i cannot tighten the adjusting nut.
My wife won,t be too impressed wheni tell her i need another lathe. :confused:

[Bill_NY]

V-
Just for the heck of it, post some photos of the damaged area. Maybe one of us can come up with a fix.

[Veritas]

Hi Bill can,t see damage just the nut does not tighten.Ok if i send them to you to have a look at.It kind of bugs me as i thought when i got this lathe i got it chaep because the chrome was flaking off.Now i think it was cheap not for cosmetic reasons.I will decline to say where i bought it from.

[RJSoftware]

Just wondering if you have considered doing this by hand.

I think Lab has some excellent post on how to do this by hand with pin vice and some hollow brass tubing.

Not sure if I remember this correctly.

RJ

[David Robertson]

Veritas...

Not meaning to tell you something you already know, but how are you trying to turn the nut? It is a split nut.. you can place a small screwdriver in the slit and spread the nut slihtly and this will allow you to use the screwdriver and your fingers to turn the nut. Unless you use the screwdriver to spread the nut slightly it is very hard to turn. These are very fine threaded nuts in hardened steel and unlikely to strip.

David

[Veritas]

David this nut is not split.It is next to the bearing.It has a hole in it.Which i used the shank of a drill bit to tighten.It just turns and turns and does not tighten.Perhaps the nuts on the Peerless are not like other ones.I will try to post a picture or send it to someone to post for me.
RJ i am not aware how to do pivot work by hand, not sure what you mean, could you find the link to what Lab says on this?

[RJSoftware]

Hey David; I went back and found the post. Not sure what I was thinking back then when I read it, as I mis-understood. (newbie)

My apology. Here's link.
http://www.silvabel.com/npivot.htm

Actually now that I think about it. A regular drill should work as the stabilizing factor is the brass tube. I can picture holding it by hand and doing it. But that's me.

RJ

[Veritas]

I managed to post a picture, it is at the top of the thread, thanks for looking. :smile:

[David Robertson]

Veritas,

Is it possible that this is the rear cone bearing we are looking at... not a nut? If you remove it, will it turn around and go inside the headstock?

See the following exploded view (http://www.bhi.co.uk/hints/lathadj.htm) of a lathe headstock. If my premise is true, you are then missing the nut and are running without a back bearing... very easy to see why you would be getting excessive runout.

David

[Veritas]

David, from what i know and what i see is this.And i won,t say i am the most knowledgeable person when it comes to watchmaker lathes.The cone shaped part next to the nut with the half hole showing is the bearing, which is threaded into the headstock.The nut next to it takes up the space and tightens the spindle to the bearing.I looked at the exploded veiw in the link.I have all the parts it shows in the diagram.Perhaps if it was fully unasembled and a photo taken it would be easier to see.
I apreciate all the input and help.
I think if there was no back bearing, there would be more than .006 runout.
The nut has the ground taper next to the headstock end, would not go into the headstock if it was reversed.I cleaned and oiled another peerless and it was the same setup as mine.

[Veritas]

David and others, i have to admit to my ignorance here.David that is the bearing in the picture, i pulled on it and the whole thing is loose on the spindle.I put the nut back on, it is a small flat nut with a cut part way through it on the side.I retightened it and rechecked the runout it now have just over a .0015 runout.That is a big difference.I sure feel stupid today, but i wanted to admit to my mistake here and owe up to it.
Wow i really feel dumb today, but at least i learned something. :confused: :smile: :razz:

[David Robertson]

The important thing is that you got it fixed up and doing as good as it is capable of doing.

If I were you, I would disassemble the headstock completely and clean the bearing surfaces really good, put it back together and oil it with ATF.. just in case some crud got in it when it was improperly assembled that could scratch the bearing surfaces..

David

[Veritas]

Good idea David, it sure could not hurt to clean and lube it. :smile: