SB 9 Rebuild

[ScroungerLee]

Dave the opposite is also true, when something comes out well it's all YOU!

Lee

[steamer]

I need a vertical slide for clock wheels and boring multiple holes in small parts.

I obtained a Myford clone milling unit as it's got T slots nearly identical to my cross slide, and I have a way to mount a Sherline spindle to it for light milling duty.

And you can then do co-ordinate drilling on the lathe as well as holes on a pitch circle. I'd be interested to see your spindle attachment, as it's one of the bits of tooling I'm currently working on.

Hi Ian,

The Sherline head mounts to the Vertical slide.   So no coordinate drilling.

Dave

[steamer]

Well.....It's Thanksgiving week....my Inlaws are coming....that means I had honey do lists a mile long
Fix washing machine spigot
Fix dryer
Pack the extra stuff from summer
Haul it to the attic
Try to see the last race of the season...
Go Grocery shoping

=

No scraping this weekend.......

[steamer]

Got a bit more done on the cross slide and did a final fitting of the compound....sits down tight .

A bit more to do...I got distracted this weekend with an shop opportunity that dropped in my lap....I'm mulling it over....

Dave

[zeeprogrammer]

Hm. Over two weeks now.
Hey! We're missing a 'poke-stick' emoticon! 

[Don1966]

Hi Dave,  glad you are back on it. I need another fix here buddy. Show us some progress when you can, Photos bud!

Don

[Jo]

Is it going to be finished for Xmas?

Jo

[Goldstar31]

Following a bit on leadscrew problems in another forum's post, I was wondering how Dave was going to compensate for  the drop in the bed height and the removal of metal under the saddle.

There is not a lot of information on this. Perhaps you could comment, please.

regards

Norman

[steamer]

Hi Norman,

I'll be putting a shim between the gearbox and leadscrew hangers, and the bed.   This will need to be determined as the bed had about .007" taken off, but, the saddle ways wore most on the apron side by about .010" so when the saddle was scraped level...it's anybodys guess as to where it ended up, so its a race to see who lowered the most!.  I might have to shim the apron!

First I need some information as to what the extent of misalignment is.   

What I plan to do is turn up a small shaft about 12" long which mimics the leadscrew.   On the right side it will have a diameter that is the same as the  journal diameter of the leadscrew hanger...and then step up to the root diameter of the leadscrew thread, and then  step up again to a good running fit inside the apron worm.   With the mimiced shaft in place, and the halfnuts closed, I can measure directly from the saddle what the difference is and compensate accordingly....where ever that might be.....but I bet I"m shimming the leadscrew hanger and gear box.

The good news is the Southbend is a simple lathe, so it shouldn't be too much trouble to shim.   I don't have a pleathora of feed shafts and control shafts that have to move like other lathes...just 1 leadscrew.

Dave

[steamer]

Is it going to be finished for Xmas?

Jo

It'll get done....we'll see if it's by Christmas.....

[Goldstar31]

I got curious because my saddle ( on the Myford) was well worn and in old practice would have needed a new casting( Myford said- on an earlier job) My present one had a Turcite insert to build it up again. Moglice or Devcon might be useful in your case?

I look forward your finished product.

Norm

[steamer]

Nope...no plastic on mine...though Moglice is a wonderful material.    It's simple enough to just shim.   Considering it never moves....I don't have any problems using a shim here....I don't like shimming Tailstocks to get them on center though...which is why I made a new base for mine.   I still need to scrape that in.

Dave

[Goldstar31]

I got to the  'Do I, Don't I' stage and whilst I had enough Meehanite to carve up, the experts said that this Turcite was how they were restoring lathes to professional standards.  Having said all that, I really don't like shim steel or brass) for obvious reasons but my little baby Stent T and C  is fabricated from steel running on steel and is perfectly OK.

Mebbe we are over fussy but one of the old contributors to Model Engineer made new shell bearings from aluminium for Rolls Royce Merlin engines for Spitfires and Hurricanes in the Western Desert.

Comment-- and we won! Our old Spitfire is still running today and it was maintained by a fitter who is still running( slowly) with 6 weeks training  . I had 6 weeks training- and so am I ,after a fashion.

All museum pieces- or so my wife comments

[steamer]

I rescraped the saddle back to alignment and bearing as it was originally from the factory in 51', though this time around with the ground bed as the reference   ....    The saddle just sits a bit lower now.

The shims are stationary and under the gearbox and hanger and clamped betwee them and the lathe bed by 3 bolts each....so If well made, I can see no problem with them being any differant than the material they are mated to.....whether the shims are brass or steel.....at least in the .010" range.

Dave

[steamer]

And there is a good reason Myford would change to a new saddle ...or raise the existing one.   The hanger bracket is pinned....in the first place...so relocating it would be very difficult indeed.

Additionally, the Myford box hangs on the vertical surface on the SIDE of the ways, while the Southbend hangs on a horizontal surface UNDER the ways.   The Myford way will work in only 1 position, while the Southbend can be easily shimmed down.

It is far easier to rebuild the Southbend I think.

Though I suppose if I had wanted to, I could have put Moglice on the saddle and built it up.   I just didn't see the need.

Dave