Home Model Engine Machinist > The Tools and Tips > Machine Modifications > New headstock on old lathe
Reply
 
Thread Tools Display Modes
Old 02-14-2012, 07:19 PM   #1
Holt
 
Holt's Avatar
 
Join Date: Oct 2010
Location: Denmark
Posts: 156
Liked 9 Times on 9 Posts
Likes Given: 1

Default New headstock on old lathe

I am about to buy a lathe, unfortunately the budget only allows an old lathe with bronze (or whatever material it is) main bearings. i am used to use a lathe with a top spreed of 3000 rpm, but i doubt the old headstock can handle this. has anyone made a new headstock with angular contact ball bearings for one of these old lathes? i was thinking of using the front wheel bearing from a front wheel drive car, they are build to run at least 2500 rpm, can take heavy load, and are cheap.
Any thoughts are much appreciated.
Holt



__________________
Holt is offline  
 
Reply With Quote Quick reply to this message
Old 02-14-2012, 07:45 PM   #2
steamer
 
Join Date: Nov 2007
Posts: 5,406
Liked 101 Times on 100 Posts
Likes Given: 6

Default Re: New headstock on old lathe

What kind of lathe?

Some manufacturers offered both....but it depends


Dave



__________________
steamer is offline  
 
Reply With Quote Quick reply to this message
Old 02-14-2012, 07:45 PM   #3
Niels Abildgaard
 
Join Date: Jun 2010
Posts: 276
Liked 45 Times on 43 Posts
Likes Given: 22

Default Re: New headstock on old lathe

Hello Holt
3000 RPM parts are not very big or long.Do the big things in the old headstock and small parts on a purpose built high speed spindle put up temporary in front of the old one.Saddle will of course be using a less worn area of bed and longitudinal and transverse feeds can work normally.

Kind regards and what lathe is on Your mind?

__________________

Kind regards

Niels

Niels Abildgaard is offline  
 
Reply With Quote Quick reply to this message
Old 02-14-2012, 08:10 PM   #4
Holt
 
Holt's Avatar
 
Join Date: Oct 2010
Location: Denmark
Posts: 156
Liked 9 Times on 9 Posts
Likes Given: 1

Default Re: New headstock on old lathe

The lathe i am looking at at the moment, is from Danish Machine Company, i have only seen pics of it. i have used a couple of these old lathes at the beginning of of my career as a machinist, with a top speed of app 1500 rpm, and that was rather scary compared with a lathe with ball bearings (the favorite lathe at work is a schaublin 125, so i guess i am a bit spoiled)

__________________
Holt is offline  
 
Reply With Quote Quick reply to this message
Old 02-14-2012, 09:51 PM   #5
n4zou
 
Join Date: Feb 2011
Posts: 320
Liked 37 Times on 30 Posts

Default Re: New headstock on old lathe

The only time I've ever used a lathe at speeds above 1,000 rpm was for polishing the finish. I've done that at slower speeds, it just takes a little longer to do it. Personally; I would just use it the way it is. I would rather have Babbitt or bronze bearings. Pulling the spindle out of a headstock with Babbitt or bronze bearings is no big deal. Doing that with a spindle mounted with tapered roller bearings is a real pain in the A** and it's time consuming.

__________________
n4zou is offline  
 
Reply With Quote Quick reply to this message
Old 02-14-2012, 10:21 PM   #6
steamer
 
Join Date: Nov 2007
Posts: 5,406
Liked 101 Times on 100 Posts
Likes Given: 6

Default Re: New headstock on old lathe

Generally, I would agree....leave it be.

What hasn't been discussed.....is the fact that most lathes are "fitted" and the center heights between the HS and the TS are matched.......Now what they did with this lathe I don't know.....could be OK or could be way off...

Dave

__________________
steamer is offline  
 
Reply With Quote Quick reply to this message
Old 02-15-2012, 03:17 PM   #7
Holt
 
Holt's Avatar
 
Join Date: Oct 2010
Location: Denmark
Posts: 156
Liked 9 Times on 9 Posts
Likes Given: 1

Default Re: New headstock on old lathe

Quote:
Originally Posted by n4zou
The only time I've ever used a lathe at speeds above 1,000 rpm was for polishing the finish
We run the schaublin at work at top speed 3000 rpm most of the time, we use 5c collets when ever we can, we use inserts, and that require higher speeds
Quote:
Originally Posted by n4zou
Pulling the spindle out of a headstock with Babbitt or bronze bearings is no big deal. Doing that with a spindle mounted with tapered roller bearings is a real pain in the A** and it's time consuming.
How often do you pull your spindle out of the headstock?
Quote:
Originally Posted by steamer
Generally, I would agree....leave it be.
What hasn't been discussed.....is the fact that most lathes are "fitted" and the center heights between the HS and the TS are matched.....
I do realise its not a straight forward job, but i don't intend to mount the original headstock again, once the new headstock is straight with the bed, the tailstock can be bored and a bush mounted to gain precise height, another reason is to make a spindle that accepts 5c collets directly






__________________
Holt is offline  
 
Reply With Quote Quick reply to this message
Old 02-15-2012, 03:38 PM   #8
steamer
 
Join Date: Nov 2007
Posts: 5,406
Liked 101 Times on 100 Posts
Likes Given: 6

Default Re: New headstock on old lathe

Hi Holt,

If your comfortable in your abilities to do that, great! go for it!

That decision is yours though....It can be very difficult to advise someone on a forum as it's hard to tell what capabilities the OP
has.

Best of luck and WE LIKE PICTURES!



Dave

__________________
steamer is offline  
 
Reply With Quote Quick reply to this message
Old 02-15-2012, 05:02 PM   #9
Blogwitch
 
Join Date: Dec 2008
Posts: 2,353
Liked 146 Times on 140 Posts
Likes Given: 1

Default Re: New headstock on old lathe

Just to give you a little insight into what you already have, and what you are considering doing.

I had an Atlas 10F for many years. The first couple of years I ran it with the plain Babbit bearing head, then changed it over to a Timken taper roller head.

By swapping over to the bearing head allowed me to run the lathe a lot faster, but the surface finishes were never as good as when running on plain bearings.
That was the one thing I really missed, and even on my new lathe, which has tapered bearings, I couldn't and can't ever reproduce those superb smooth finishes using a straight cut that the Babbit bearings gave me, I always have to finish off with a final hand polish.

So before you go doing anything tragic, try your machine out fully first, you never know, you could soon start to appreciate what you already have.


John

__________________
Blogwitch is offline  
 
Reply With Quote Quick reply to this message
Old 02-15-2012, 07:03 PM   #10
Florian
 
Join Date: Apr 2008
Posts: 230
Liked 24 Times on 24 Posts

Default Re: New headstock on old lathe

Hi Holt

I can tell something about Schaublin Headstocks:
The old ones had a double row cylindrical roller bearing with tapered bore.
To adjust the bearing play, you drive the inner race onto a taper which has to be on the spindle.

These bearings are high precision bearings and quite expensive, a single one costs about 650$ (had to replace the one on my schaublin lathe... )

When you have such a bearing, you will get very good surface finish. But the bearing alone is not everything.

To reach a good surface, you will need to be able to adjust all the guides to almost no play and therefore they should not be worn out.

Also the headstock should be machined very exactly including precision ground/precionsion machined bearing seats to provide a good fit on the outer race.

To get stability, the headstock needs to be scraped in onto the bed / headstock mounting surface to get a "full contact" surface.

If you are able to do all this and willing to spend a lot of time and quite some money, then go for it.
Otherwise I recommend to search a little longer and get yourself a used lathe in good condition with the desired specifications like collets in the spindel and everything else you want.

Cheers Florian
ps: I bought me a used 102VM and have been restoring it for quite a long time.
pps: www.lathes.co.uk may help you with the lathe identification....



__________________
Florian is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lathe Headstock Bearing Replacement Recommendations? cfellows Machine Modifications 15 04-12-2012 02:37 PM
Taig ER16 Headstock /// Tools 19 11-11-2011 01:06 AM
change headstock bearing ML7 troll Machine Modifications 5 02-20-2011 09:53 AM
Headstock alignment and camlock chuck question Dave_424 Questions and Answers 6 06-02-2010 10:44 PM
Myford headstock dividing deverett Tools 20 01-13-2009 12:30 AM




- Top - Member List