SB 9 Rebuild

[Goldstar31]

It's a bit trickier than that with the older Myfords. If one gets to the stage of avoiding the narrow guide principle, the saddle has to be offset to bear on Number 4 shear instead of the normal number 2 one.

It's interesting. Some Myford owner might ask 'How, when and why'

Sorry, I didn't really want to go off from SB's( whatever they are )

ooops

N

[Dan Rowe]

SB stands for South Bend Lathe think Boxford as they are very similar.
http://www.lathes.co.uk/boxford/

Dan

[steamer]

Yup.... A Boxford Model A is just about identical to a Southbend 9" Model A.....as well as Hercus, Smart and Brown....ect

Dave

[Goldstar31]

Apologies, gentlemen, English humour

It's in the jeans. Sorry, genes!

[steamer]

OK...after a stressful, but productive week at work...it's the weekend!

I plan to do some work on the "bend"....but ...I may I may be distracted by shiney things....

Dave

[zeeprogrammer]

....but ...I may I may be distracted by shiney things....

Understandable. So long as there's PICS of shiney things. 

[Jo]

OK...after a stressful, but productive week at work...it's the weekend!

....but ...I may I may be distracted by shiney things....

If only stress at work ended up achieving something tangible. Looking forward to seeing your progress.

Shiney things are fun .

Jo

[steamer]

OK!
The cross slide and saddle are done!

Started tonight by measureing the alignment of the HS spindle with respect to the saddle ways
YUK!

The end of the test bar should be pointing up and towards the front by the. 0005"

Its pointing down. 0015 and to the rear. 002"!

Im going to adjust the spindle bearings first and see where we end upp

Ok.  Considering I only want to do this once.....ill take the spindle apart and put the new belt on

[Don1966]

We are waiting patiencely Dave, rushing things only causes delays so take it slowly buddy. We want to see it done like its suppose to. You have done wonders so far so keep up the excellent progress.

Don

[steamer]

Thanks Don
It should start to pick up the pace now...
The next real challenge will be aligning the leadscrew....
The tailstock should be tediuos.....but straight forward
The tough part is really over
.....at least I think it is anyways

Dave

[steamer]

Here's a few photo's
Top front of test bar....zero


At end of the spindle...+.0015


In the horizontal plane, at the end of the front of the test bar.....zero


At the end of the spindle....-.002


And to my previous point...as this is a plain bearing spindle.....I need to make sure the bearings are adjusted correctly, before I can do anything about this.   The test bar is 9" long , and the standard is +.0005/12" up and to the front.   This translates to 9/12 x .0005 or about .0003" maximum at the end of the bar.

There doesn't seem to be any affect from tightening the HS clamp screws. That tells me the HS fits the bed pretty well..

Dave

[swilliams]

Hi Dave

So, if necessary, are you going to scrape the bottom of the headstock or the bearings to fix this up?

Steve

[steamer]

Hi Steve
Yes....The bottom of the casting exactly...but before I do I want to be sure the spindle is fitting it's bearings correctly.  If it really is off that far...it's from one of two things....

The casting distorted with age....or

It was never fitted correctly in the first place....

It appears to be stable...so it isn't twisted, and it seems to be bearing evenly.   

Dave

PS...the bearing is split on one side...so scraping the bearing isn't really an option as it would be way out of round and impossible to correct.

[Mosey]

Or, the HS is not original to this machine. Many SB's have been put together from parts of other machines over the years.

[steamer]

I don't know Mosey....the ways would have had to been WAY off for that alignment to make any sense.......

Dave