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Lathe back gears

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Camnefdt

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Hi all

So I've done some reading inside the south bend lathe operating book and it talks about the back gears on the head stock being used to get slower operating speeds.

Can somebody perhaps elaborate a little more on how this system is meant to operate?

I will attach a pic of my head stock off the colchester I just got but when back gears are engaged, the head stock is completely locked up.

Are both gears on each side of the pulleys meant to be hard fastened to the shaft? I do plan on stripping the whole system over the weekend to clean up and check up on the condition of bearings etc but just an idea of how its suppose to work would help

20180626_205051.jpg
 

Camnefdt

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Never mind, found it already hahaha just shows that looking for 1 more second (literally) can make all the difference
 

markba633csi

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Yes the all-important pin :D
How are your gears? They look pretty good from what I can see
 

dlane

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South Bend have a pin that pulls out to disengage the bull gear from the pullys.
Have pics of your lathe ? We like pics
 

Camnefdt

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Yes the all-important pin :D
How are your gears? They look pretty good from what I can see
There's 1 or 2 with tiny chip on a tooth or so but all in all they seem good condition.

Everything is covered in some kind of horrible lubricating 'stuff' which i can only think of as being like a copper compound spray that was sprayed all over everything
 

Camnefdt

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South Bend have a pin that pulls out to disengage the bull gear from the pullys.
Have pics of your lathe ? We like pics
This is the full lathe, colchester britannia which, as best I can track, was made between 1920 and 1930.

ad_1529605360071.jpg
 

markba633csi

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Must be a rare one, no information on that model I can find, only Triumph and Master models of that era
 

Smithdoor

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South Bend have a pin that pulls out to disengage the bull gear from the pullys.
Have pics of your lathe ? We like pics
This is the full lathe, colchester britannia which, as best I can track, was made between 1920 and 1930.
Looks great
Look big for a pin , sliding knob or some other in Gage the large gear.

Typical from time of building it was simple and basic

Dave

Sent from my SAMSUNG-SM-J320A using Tapatalk
 

Smithdoor

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Using back gears and the blet gave good power at speed and then blet give good finish on last pass

Dave

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Camnefdt

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Looks great
Look big for a pin , sliding knob or some other in Gage the large gear.

Typical from time of building it was simple and basic

Dave

Sent from my SAMSUNG-SM-J320A using Tapatalk
1530072518256725924323.jpgthe back gears themselves are on an offset bushing with a dial that you pull out, then turn and has a detent to clip into position, but to disengage the gear from the pulleys, it has a little switch type thing on the side of the biggest pulley.
 

Smithdoor

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The big gear on the spindle
Looks great
Look big for a pin , sliding knob or some other in Gage the large gear.

Typical from time of building it was simple and basic

Dave

Sent from my SAMSUNG-SM-J320A using Tapatalk
View attachment 270634the back gears themselves are on an offset bushing with a dial that you pull out, then turn and has a detent to clip into position, but to disengage the gear from the pulleys, it has a little switch type thing on the side of the biggest pulley.
Sent from my SAMSUNG-SM-J320A using Tapatalk
 
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