Repairing a Cub Lathe

[Rob.Wilson]

Hi ALL  


I was given  an old Churhill Redman Cub lathe a few years back ,i started fixing it up, but   lead me a stray ,and its been sitting there for the past year or so.
And the fact that i did not have a power supply to run the lathe was always in the back of my mined ,so there was no real hurry , Well until now ,as luck would have it a member of Madmodder had a phase conveter for sale , so after a quick trip,its now in my shop    cheers Rob .

The lathe ,I had to completly strip the head stock to repair the feed mechanisum,

The lathe came with 4 jaw (needs new jaws ) 3 jaw, 12"face plate ,catch plate and a TTA (some parts missing) , all the change wheels are there for metric and imperial


I will have to do lots of head scratching to remember were all the bits go  
 

The cross slide and apron gearing are just a tad shagged , The cross slde lead screw was completly worn out and the gear  had bent teeth.




Now for the head slapping moment, in my haste ,i set about making a new leadscrew , mesured up the thread ,turnned down the en24 bar to size , cut the correct pitch,
I cut a R/H thread , it should have been L/H   what a waits of 3 hours , it now sits at the back of my lathe to remined me to pay attention  
The old screw and the F*&d up screw


Take two, still requires the wood ruff key and the gear cut





So i am now going to put all other projects on hold and get cracking on with getting the lathe up and running.


Cheers Rob

[dsquire]

Rob

Looks like you have a nice project going there to restore the lathe and looks like you have made a good start. Too bad about the lead screw but I think most of us have had something like that happen a few times in our past. I'll be watching as you get the rest of it into top shape. 

Cheers

Don

[ieezitin]

Hi Rob.
Nice job on the lead screw.

Your little mishap with the orientation of the screw reminds me of a blunder I made a few years ago. I am a pipe fitter /welder and I was working for this contractor for a chemical company, they had built this 400,000 sqft building and the heating coils were hung in the roof. The steam supply was in the air hanging 5ft lower that the coils and it was my job to pipe from the main supply to the coils, everything was generic so I made an isometric of every coil which took me about a day to complete.

In the fab shop I started to cut, mark and prep all my runs of pipe, that was about 2 days work, anyways everything cut and ready I started to fit my fittings and weld them up, I did this to everything, while planning certain ways I was going to field fit my piping I was building in my fits. Total time for everything was about 7 full work days.

I go to fit my first coil and I found it to be so so to high and so so too wide, scratching my head I went back to my prints then back to the coil, then I dawned on me I did not take off my end-to-center measurements of my fittings, I have been pipefitting for 20 years and this is one stupid thing you do while you are a rookie.

Feeling an ass I told the foreman in turn he told the boss, he came down to me and I thought he was going to kick me straight in the N*ts,  but!!!!!!!!!!!! Just as he was reaming me a new one his son came flying round and a large piece of construction equipment and smashed into the new roller shutter doors they just installed that morning.

So! I kept my job and he lost a bundle!……..   Good luck with the rebuild.  Anthony.         

[Bernd]

Anthony,

Couldn't you have turned that lead screw around and used it that way?  (sorry just can't resist moments like this)

I've done similar, not once but twice. Kind of like cutting a piece off and finding it's to short no matter how many times you cut it.

Bernd

[slowcoach]

Nice bit of machining Rob  That lathe looks a nice bit of kit 


Rob

[Rob.Wilson]

Cheers Lads

Yep Don , it won't be the last time ,i mess up . , it happens to us all  ,  i will just have to design a project that needs a R/H lead screw 
Good one Anthony 
Bernd, i think you have lost it mate 
Cheers Rob / ( slowcoach for Bernd's benifit  )  I still have a good few parts to make ,befor she is up and running .it may take a while.


Cheers Rob (Rob.Wilson)

[Darren]

Rob,

I know you prob just wanted it just right and all that, but couldn't you have just used RH for LH and LH for RH  

New leadscrew nut as well of course.

btw, how hard it it to cut acme threads  

[Rob.Wilson]

Hi Lads

Tonight i thought i would put the apron back together ,just to refresh the brian cell and to see how bad things are ,  and they are BAD .

here is a shot of the gearing in the apron , the large gear dose not run in the correct position on the clutch gear.when saddle travel is selected. also there is a thrust bearing missing ,were you see the three washers , thats  how it was when i stripped it .


The repiar job that had been done to the clutch/gear, a loverly bit of welding . so i will have to make a new cone cluch with gear , so it lines up with the other gear.


The rest of the apron gears







And i found some damage to  the 110 tooth  change wheel



On the plus side the thread indicator works OK 

Cheers Rob

[Rob.Wilson]

Rob,

I know you prob just wanted it just right and all that, but couldn't you have just used RH for LH and LH for RH  

New leadscrew nut as well of course.

btw, how hard it it to cut acme threads  

Sorry Darren i posted at the same time .

  now why did i not think of that ,as i do have to make a new nut any way 

Cutting the tread was ok , it took about 1 hour to actually cut the thread , the rest of the time was spent turnning the bar to size ,i used the Myford , it did wear down  the arms a bit  on the travelling steady


Cheers Rob

[Artie]

Bloody hell..Rob, wow, poor old girls a mess. Huge job mate, watching with (much) interest. Good luck.

Rob

[slowcoach]

Nice bit of machining Rob  That lathe looks a nice bit of kit 


Rob

What I should of said is, That lathe looks a right piece of S**t 
But I'm sure you'll put her right mate 

Rob (slowcoach) 

[Darren]

Thanks for the reply Rob..practice makes perfect and all that 

Not that you seem to need it. I was just wondering if there was a reason the thread had to be handed the right way.

I have been told acme threads are almost impossible for us to cut with our machines, though I couldn't see why?
You have of course shown us this is not so 

Very nice progress, watching this thread with great interest 

[Rob.Wilson]

Hi Lads

Hi Rob ,the lathe is justs a tad worm   Rob ,,,,,,,, i think Rob described the lathe better , as a right piece of s%&^t  
 

Regards  Rob


Lets see what Bernd makes of this post  

[Rob.Wilson]

I was just wondering if there was a reason the thread had to be handed the right way.
I have been told acme threads are almost impossible for us to cut with our machines, though I couldn't see why?

Hi Darren

It has just come to me , i had a brain fart , The lead screw needs to be L/H so it matches the cross slide dial 0 to 125 , if it were R/H i would have to work backwards on the dial 120 to 0 when putting a cut on .

Cutting the thread was really no trouble , and i used EN24T for the leadscrew , you just have to go slow and use a traverling steady ,as it dose require allot of force at full thread dept .

Cheers Rob

[John Hill]

Sometimes I think the Chinese chappies put an incorrectly handed feed screw on my lathe.  With the gear box set one way the carriage feeds towards the chuck but set like that the cross slide feeds outwards.

[Rob.Wilson]

Hi John

Yep thats normal mate , my Boxford and Myford lathe ,both do that , i just have to flip the tumbler reverse lever .


Regards Rob

[Rob.Wilson]

Hi Lads

I thought i would make a start on the gears today , then i realised i still had no way of indexing on the myford ,as i have put the indexer on hold, and i need to cut six 1/4" keyways in the change wheel boss.


So this morning i made this , to index of the 60T bull wheel and lock the chuck in position


Its made to fit so it dose not need removing from the lathe ,


Now to make a 1/4 tool holder for my slotting attachment

Cheers Rob

[Darren]

You never cease to amaze me Rob, very eloquent 

[Rob.Wilson]

Cheers Darren

Well i have made the 1/4 tool holder for the slotter, and my saw has finaly finished cutting through a 6" dia cast iron bar,after 4 hours,i must get some new blades ,poor saw,,, so now i have the gear blank for the 110 t gear.



I think i will have a brake, as i keep putting things down ,and then some one moves it, i look all over , then they put it back ,right in front of my eyes 

Cheers Rob

[Darren]

OK, enough of the tool porn ... I would like to know how you made that square hole .... 

[Rob.Wilson]

Hi Darren

Tool porn 

I would like to say i hand filed it ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,but i cheated    made in two parts and silver solderd together


Cheers Rob

[Artie]

Well mate, in my books thats NOT cheating.... its using to grey matter. Good stuff.

Rob

[Darren]

Thanks Rob, I thought it might have been something along those lines... I tried looking for the joint lines ..... 

[jatt]

you must be a sucker for punishment.  Will watch the repair/rebuild job with great interest

[Rob.Wilson]

Cheers lads

Jatt ,    i am  but it give me something to do 


Cheers Rob