Got a chance to use my 25/32" socket

[Fritz Maurer]

I hope its not another 50 years.

Nineteenth century

Goodnow & Wightman 9 inch. Originally foot and flywheel power.

 

[T.R.K.]

Now you know why it was in the set.
My Cousin (gone now) told me the only place he ever used the 25/32 was on a Model A Ford tie rod. The nuts on the clamp were 25/32.

 

[riverbend]

Maybe they all look the same but it looks like great granddad of a Southbend 8". Most of the 25/32" I come across are square heads.

 

[4wdtom]

I hope its not another 50 years.

Nineteenth century View attachment 144671View attachment 144672Goodnow & Wightman 9 inch. Originally foot and flywheel power.

Looks like the start of a project! Do you have a stack of change gears for it?

 

[Fritz Maurer]

Looks like the start of a project! Do you have a stack of change gears for it?

Yes I have about 6. Am currently on a search for someone who has the formula to make a metric transposing gear. The primary use is intended to cut metric threads, for pullers and such.... I run into that a lot with motorcycle engines and Chinese engines. Everyone wants to have their own obscure puller. Sachs alone I have encountered 3 different styles.

 

[riverbend]

A machinist friend told me that there are no good transposing gears, you need a metric lead screw to make good metric threads. He is very fussy about things like that. The conversion is so close to 2.54 you would think something with 127/5 would work.

 

[Fritz Maurer]

A machinist friend told me that there are no good transposing gears, you need a metric lead screw to make good metric threads. He is very fussy about things like that. The conversion is so close to 2.54 you would think something with 127/5 would work.

That's all there is to it? I would have thought at least the lead screw pitch would have to be known.

It looks like a piece of threaded rod, not Acme threads like everyone else has.

I just figured a transposing gear would be the way to go since South Bend used to offer the gear when they were in business, and, if you ever read much of their literature, they were strict perfectionists ; l don't think they would offer an attachment that was "close enough " , while at the same time rant and rave about the lathe being absolutely level in all directions or " the bed will be twisted and the machine will turn and bore taper" .

I would love to have a South Bend Metric, but I've never seen ANY size under $12000.

If i have to get a lead screw made, I'm ok with that.

 

[560Dennis]

Interesting lathe

 

[riverbend]

Have you had a look at McMaster Carr ? They have metric lead screws and the matching nuts. But not half nuts.

A puller with 20 threads seems like it would screw in and work fine if the last thread was off by 2.54/2.53999...

 

[4wdtom]

I believe a brief explanation is this. You first convert the metric thread measurement from millimeters per thread to threads per centimeter, then the transposing gears (50 and 127 which can be a finer (smaller) set of gears than the change gears for the lathe) convert the centimeters to inches as there is 2.54 centimeters per inch. So, for a metric pitch of 1 or 10 threads per centimeter with the transposing gears you now cut this thread instead of 10 threads per inch when the lathe is geared for 10 threads per inch. Look at the Logan Lathe website for some ideas and very close approximations of the 50/127 gears. The 1934 (31st addition) of the Southbend How to Run a Lathe booklet has charts for quick change lathes and plain change. Fine print but readable. The 1941 (41st edition) is different, still having a lot of information on this. I recommend finding a copy of this booklet.

 

[Fritz Maurer]

I believe a brief explanation is this. You first convert the metric thread measurement from millimeters per thread to threads per centimeter, then the transposing gears (50 and 127 which can be a finer (smaller) set of gears than the change gears for the lathe) convert the centimeters to inches as there is 2.54 centimeters per inch. So, for a metric pitch of 1 or 10 threads per centimeter with the transposing gears you now cut this thread instead of 10 threads per inch when the lathe is geared for 10 threads per inch. Look at the Logan Lathe website for some ideas and very close approximations of the 50/127 gears. The 1934 (31st addition) of the Southbend How to Run a Lathe booklet has charts for quick change lathes and plain change. Fine print but readable. The 1941 (41st edition) is different, still having a lot of information on this. I recommend finding a copy of this booklet.

Thank you, will try both of those ASAP.

 

[Caryc]

Get yourself a set of Metrinch sockets and you won't need that socket any more.

 

[buickanddeere]

A 20mm is fairly close to 25/32.

 

[buickanddeere]

Full agreement here . The 1500 has enough towing capacity for our needs . Plus the truck sits several inches lower to get in and out of . Plus it will wiggle in an underground parking that a 3/4 ton can not attempt .
Mrs B&D lets me drive the old 2017, now that she has the 2023 .