Bought 1st lathe, Logan 1922, have questions.

[Ecberry71]

Hello all!
I am fairly new to metal lathes but I e always had an interest in them. I just purchased a Logan 1922 which needs some major cleaning. I have it almost entirely torn down now getting ready to clean and repaint. It came with an 8” 3 jaw Chuck with no manufacturer name on it… it just says Poland PUUm-s8-2 1/4- 8ZD No 0938 and towards the center it has 80-.. can anyone tell me what brand of Chuck this is and if it is any good?

Thank you very much and I will appreciate any help with other questions I may have with this, as I am sure there will be plenty.

 

[johnoder]

Even though not Logan, might be helpful in a generic sense.

http://vintagemachinery.org/pubs/1617/5795.pdf

have fun

 

[L Vanice]

The best-known Polish lathe chuck company started in 1950 and was called FPU. They had a picture of a Bison as a trademark. They are now called Bison-Bial and still use a bison trademark. They were cheaper than USA chucks several decades ago when they were first imported here, but are no longer cheap. They are good quality. I do not know of any other Polish chucks sold in the USA.

Condition and design is often more important than maker when deciding if an old chuck is "any good."

You might find a helpful 11" Logan manual here: Logan Engineering Co. - Publication Reprints | VintageMachinery.org

Larry

 

[Newman109]

Even though not Logan, might be helpful in a generic sense.

http://vintagemachinery.org/pubs/1617/5795.pdf

have fun

That's a great book. I still have a copy on my desk that my professional machinist friend gave me 25 years ago to get me started on my first lathe. I'm sure that it will be very helpful to the OP and anyone else who needs good information on the operation of a manual lathe.

 

[Joe Gwinn]

I just purchased a Logan 1922 which needs some major cleaning. I have it almost entirely torn down now getting ready to clean and repaint.

The manufacturer, Logan Actuator Company, still exists and still provides information and spare parts, and has a reflector.

[email protected] | Join

It came with an 8” 3 jaw Chuck with no manufacturer name on it… it just says Poland PUUm-s8-2 1/4- 8ZD No 0938 and towards the center it has 80-.. can anyone tell me what brand of Chuck this is and if it is any good?

As others have said, it's likely a Bison, which are well made, but condition of the chuck you have is important.

 

[michiganbuck]

Often old 3 jaws area little off so one puts close needing work between centers.
A chuck held soft center is good for this and you take a light tool bit skim off it when you use it.
Having a line-up mark to your chuck is best so you put it back at that same spot.
You can make a big bell center for your chuck..And yes a 4 jaw independent.is often much better than a 3 Jaw.

You can also put a stub in a chuck and turn it to be a short mandrel, so tapered .002 - .003 or so to lock in the part's bore. They are very close to go from a part Id, to a method to do work on that part. You never work a mandrel held part down -taper. Just use toward the greater taper way.

You can put centers in a piece/bar of CRS and make your own mandrel. They hold up very well/Ok if you are careful with them.
Logan is a very good lathe.

 

[Ecberry71]

Thank you all for the information! It was well appreciated. I have another question about the chuck. I would like to buy a 4 jaw chuck for it but I have an issue with the thread pitch on the spindle. I know it’s 8” with a 2 1/4” opening, but when I try to measure the thread pitch I am coming up with 2 different possibilities. I measure a half inch of threads (like the directions say to) and double the count, I come up with 5 threads in that half inch, double that and I have 10 TPI. However, everything I’ve been reading online is saying it’s TPI. I certainly don’t want to purchase the wrong one and have to go through the process of exchange. Also, I won’t be using this professionally so I won’t need anything too extreme, but what would be a good chuck brand to look into? … without spending $1,000 of course. Lol

 

[johnoder]

Says its 2 1/4 - 8

Logan 1922 spindle nose? - Google Search

have fun

Thank you all for the information! It was well appreciated. I have another question about the chuck. I would like to buy a 4 jaw chuck for it but I have an issue with the thread pitch on the spindle. I know it’s 8” with a 2 1/4” opening, but when I try to measure the thread pitch I am coming up with 2 different possibilities. I measure a half inch of threads (like the directions say to) and double the count, I come up with 5 threads in that half inch, double that and I have 10 TPI. However, everything I’ve been reading online is saying it’s TPI. I certainly don’t want to purchase the wrong one and have to go through the process of exchange. Also, I won’t be using this professionally so I won’t need anything too extreme, but what would be a good chuck brand to look into? … without spending $1,000 of course. Lol

 

[L Vanice]

Thank you all for the information! It was well appreciated. I have another question about the chuck. I would like to buy a 4 jaw chuck for it but I have an issue with the thread pitch on the spindle. I know it’s 8” with a 2 1/4” opening, but when I try to measure the thread pitch I am coming up with 2 different possibilities. I measure a half inch of threads (like the directions say to) and double the count, I come up with 5 threads in that half inch, double that and I have 10 TPI. However, everything I’ve been reading online is saying it’s TPI. I certainly don’t want to purchase the wrong one and have to go through the process of exchange. Also, I won’t be using this professionally so I won’t need anything too extreme, but what would be a good chuck brand to look into? … without spending $1,000 of course. Lol

No doubt you have some sort of steel scale (ruler in kid language) that has marks for 1/8 inch. If your spindle threads are 8 TPI, then the threads will exactly line up with all the 1/8 inch marks on the scale.

Learning how to count threads is useful, and the scale will probably help you understand the process. Another useful tool is a 3/8 coarse (3/8-16 NC) bolt, which has 16 TPI. Lay one against your spindle threads and see if every second bolt thread lines up with a spindle thread.

It is easy to buy steel scales with 1/10 and 1/100 inch divisions on one side and 1/32 and 1/64 inch divisions on the other. They can quickly identify a 10 TPI thread. Thread pitch gages are a normal tool for a lathe owner to have, and even a cheap Indian gage will do an adequate job. They have a leaf for all the common and some uncommon pitches, so they are more useful than the steel scales for identifying some pitches, like 12 and 13 TPI.

Larry