SB 9 Rebuild

[arnoldb]

 Oh, I just know you'll set it right Dave  - glad to see you getting a bit of shop time 
Kind regards, Arnold

[steamer]

It'll be right Arnold....I've got next week off!

Time to reflectwork in the shop...do the honey do list.....

Dave

[Jo]

It'll be right Arnold....I've got next week off!

Time to reflectwork in the shop...do the honey do list.....

Dave

Dave top of your honey do list must be to make time for moving all those machines around to allow space for the new one : having another machine tool blocking the drive especially at this time of the year is a big no-no. 

(I won't tell her were Norn is going in the meantime if you don't )

Jo

[steamer]

I might even get some Wallaby time in......we'll see.

Dave

[steamer]

OH I can assure you Mama knows all and sees all!

She was the one who agreed with me to go look at the "new" mill in the first place.....

And she knows what's going on with Norm...

Dave

It'll be right Arnold....I've got next week off!

Time to reflectwork in the shop...do the honey do list.....

Dave

Dave top of your honey do list must be to make time for moving all those machines around to allow space for the new one : having another machine tool blocking the drive especially at this time of the year is a big no-no. 

(I won't tell her were Norn is going in the meantime if you don't )

Jo

[steamer]

I picked up the thrust washer/bearing upgrade...so when I tear down the headstock this week to put the new belt on...I can put that in too.

Dave

[steamer]

Been racking the brain to explain why the HS is so far out of wack....I've carefully cleaned it...it doesn't show any burrs...it was clearly scraped by someone!...Sometime!
I ran the numbers on test bar droop....and they are only drooping about 70 millionths...which I can't possibly measure
I've rotated the test bar to split the run out....that only helped .0001 to .0002"....maybe....so it's not that

I'm coming to the conclusion that it is either the bearings are way out of adjustment...or it's been like this from day one...but that is a LOT of error for a reputable lathe builder....

I'll stone the v and flat gently again today and see if I see anything

I'm just fairly convinced that I'm missing something....so must be carefull.

Again there is no difference between the HS bolted down or not...so it's sitting on the flat and Vee pretty well right now.

I'll be pulling the spindle, back gear assembly  and countershaft today and installing the drive belt....this will be the last time I'll pull the HS apart I hope.

I'll then re-install the spindle and set the bearing clearances to factory spec....and we'll check alignment again....

Dave

[steamer]

OK...checked the bearings....they're perfect.

Installed the belt

Installed the thrust bearing upgrade....that was simple...

Still pointing down and to  the rear!...by the same amount

Time to get to work.....I'll get the bearing decent first...and then turn the Headstock

To do that I;m going to cut the rear inside V way and the rear flat way on the headstock....that will turn the spindle nose  up and towards the front.    I need to check bearing first though...as I remember the grinder telling me the Vees weren't really 90 degrees before, but that they are now....so I suspect the fit is not that good...so I should get the bearing close first. and then cut the inside V way as described above.

Don, I uncrated the 3/4 HP 3 phase motor...it's nice!   I need to finish the control box for that this week before I lose Norm in 2 weeks....
The belt I picked out fit perfectly.  Just the right length.   I need to mount that motor too!

Lots to do!

Dave

[Don1966]

Ok Dave, If you run into any trouble wth motor and drive just PM me. Good luck pal.

Don

[steamer]

OK not without a fight!...but it got there.





end of the bar
Front to back






Please note the tenths indicator....so let me explain what happened and what I did

I found the headstock spindle was pointing down about .002" and towards the back by .002"   BAD.
It should be up at the end of the bar by .0005 max and towards the front by .0005" max.

I ran a few experiments to see what the hell was going on....if I put the Headstock in the normal position on the bed, it rocked ..it was only sitting on three of the four points.   BUT  If I moved the headstock to anyplace else on the bed...it sat down nice and tight and marked up with good bearing...but was still pointing down and to the back by .0015"

I found two things....The Headstock was either warped with age or damaged by the previous owner, and the newly ground bed had a "swoop" in the last 6" of the inner Vway directly under the Headstock.  It checked out with a indicator and with the Master precision level....
(*@(*&@(*@&#(@*&(@

OK   what to do?....BOTH PARTS ARE WRONG!.........I decided to punt!

I reckon the Headstock....being the headstock...will always sit on the left hand end of the bed....where headstocks sit.....so I scraped the headstock back into alignment at that position only!.....It now sits down on the ways nice and tight...and has the alignment shown above

.0004" up at the top and .0002" towards the front .      It shows no signs of moving when I push on the headstock from any direction, and I haven't put the HS clamps on yet.   I will check to see if there is any movement when I clamp in down...but I don't expect any.

All in all a very productive day in the shop...


Dave

[steamer]

I mounted the HS clamps in place and got the same readings!   So...on to the tailstock!  I'll start by scraping the flat and vee to match the bed..and get the TS mortise square to the ways...or at least close!...Then I'll bring the top bearing surface down first on the mill..to like plus
.002" and then scrap it to align the TS spindle.   I'll also need to finish the lever lock parts so I can do the alignments.

I'll take a picture of current progress and the test bar so maybe this will all make some sense ....in the morning...I've been going since 4 this morning!...

A few more days like this and I'll have a lathe running!

Cheers!

Dave

[Don1966]

Looking good Dave, I just wish I could do that kind of work. I am still not happy with my lathe DTI read outs. But I will sort it out eventually. Your getting close buddy and you'll be using it before you know it. I'll be waiting for more photos.

Don

[Jo]

Very impressive I am looking forward to seeing some bits of Wallaby being turned out on her.

Jo

[steamer]

Very impressive I am looking forward to seeing some bits of Wallaby being turned out on her.

Jo

So am I Jo!   What's left......I won't call it a ETC.....I know better

Tailstock clamp
            Make clamp stud
            Remake locking cam...current one doesn't have enough throw
            Make the operating handle for the clamp
Fitting and aligning the tailstock
            Alignment to the ways in two planes
            Bring the center height .001" higher than HS center as checked with a mandrel held between centers.
Final check of alignment of the saddle, this time with Headstock as the Datum.
             THAT SHOULD BE THE END OF THE SCRAPING!
Apron....do I need to shim the rack down?....
Leadscrew hangers probably need to be lowered
            Need to make a mandrel to check leadscrew alignment
            Need to make shims to lower the hangers.
Finish the control box.
wire up the motor and control box
Get a motor belt if I don't have one already....
Mount the motor
Repair damaged paint
Inspect alignments as outlined in the lathe build sheet
Drink beer!

With that  we mark completion of phase 2 of this project.  A running lathe!   The rest is rebuilding of tooling items, but I won't consider that part of this thread.  This thread will end once she's running   If there is interest in the tooling items...I'll post them in another thread
I know there is interest in the milling attachment rebuild...and I haven't forgotten...but it will be another thread

.....Make Wallaby parts....


............I don't THINK I missed anything....but I probably did!..

Dave

[Mosey]

Pictures, please?