SB 10k Rebuild - Starting with Gear Box

L

longburn

Plastic

Joined

Jul 29, 2010

Location

Alberta Canada

• Dec 12, 2011

• #1

Hi Folks
Starting the rebuild of a 10K toolroom. Its dirty and in poor condition. Starting with the gear box. One of the tumblers has a bent rod. I'd like to take the tumbler apart, but can not seem to figure out how to disassemble the tumbler. Is there a trick to this? Regards Ritchie

 

paulsomlo

Stainless

Joined

Oct 15, 2009

Location

Colorado

• Dec 13, 2011

• #2

If the bent rod you're referring to is the plunger that engages the holes in the gearbox casting, it can be accessed by removing the knurled plunger knob, which is pinned. The pins are very well disguised near the operator end of each knob. Here's a parts diagram, courtesy of Steve Wells:
http://www.wswells.com/partslist/903E.pdf
You may find one of these helpful as well:
Rebuild Manual & Kit for South Bend Lathe - Model 10k | eBay

Paul

 

I

iwananew10K

Diamond

Joined

Sep 12, 2010

Location

moscow,ohio

• Dec 13, 2011

• #3

yes, if you mean the knurled knob, it is pinned - if you clean the little countersunk hole on the end of the knob you can actually see the little pin passing through and get an idea of where it is.

 

E

edkolt

Hot Rolled

Joined

Mar 19, 2010

Location

NW Ohio, USA

• Dec 13, 2011

• #4

iwananew10K said:

yes, if you mean the knurled knob, it is pinned - if you clean the little countersunk hole on the end of the knob you can actually see the little pin passing through and get an idea of where it is.

Click to expand...

Those are tapered pins, if you hit the wrong end you will make a lot of work for yourself. You must find the smaller end and use a smaller punch.

Ed S

 

I

iwananew10K

Diamond

Joined

Sep 12, 2010

Location

moscow,ohio

• Dec 13, 2011

• #5

maybe i was lucky but on mine the pin was straight. could have been modded or maybe even SB did it different ways??
another way to find the ends(and that would verify if it`s straight or tapered on your`s) is to polish up the knob and hit it with a cold bluing solution- the different steels will take the bluing differently and show exactly where it is. - i think this is one of Dennis Turk`s methods.

 

L

longburn

Plastic

Joined

Jul 29, 2010

Location

Alberta Canada

• Dec 13, 2011

• #6

Thanks Folks, thanks for the great advice.

Sounds like I've been looking in all the wrong places. I'll give it a try this evening.

Ritchie

 

I

iwananew10K

Diamond

Joined

Sep 12, 2010

Location

moscow,ohio

• Dec 13, 2011

• #7

here`s an exploded view of a 10K style reverser lever - it has the same knob as on the gearbox-


http://www.practicalmachinist.com/v...adscrew-reverse-lever-installed-9-abc-129098/

 

paulsomlo

Stainless

Joined

Oct 15, 2009

Location

Colorado

• Dec 13, 2011

• #8

The list of commercially available hardware, http://www.wewilliams.net/docs/Commercially%20Available%20Hardware%20Items%20-%20Form%201178.pdf, indicates that the pin, 160x27, is indeed straight.

 

L

longburn

Plastic

Joined

Jul 29, 2010

Location

Alberta Canada

• Dec 13, 2011

• #9

Thanks Folks
With a magnifying glass to help my poor old eyes, I did find the pin and it came out smoothly. Now I'm back in business to turn a new rod and reassemble.

The poin in mine is also a straight pin.

Thanks Ritchie