Logan Lathe Model 210: Compound Slide Issue

[Adman11]

Hi all, I am new member and have above lathe serial number 33490 which is new to me but appears to be about 1945 vintage. In cleaning up this lathe, I have come across following preliminary issues:

1. Cone Spindle Gear for engaging backgears is missing 6 stripped teeth so will need to locate new one part LA-119-1 if anyone has one... Pressing out old bushing and gear looks to be a process due to lack of room to fit a puller or a push rod from pulley end.

2. Compound Slide: Have removed from cross slide
a. Removed ball crank handle and outside nut. Handle has nub of pin going through bore into slot/keyway groove cut into end of the screw shaft, but there is no key (only that pin..) . That shaft end has damaged threads presumably from someone turning or pulling handle off when it was not in that cut slot. I measured threads on both the outside nut and the end of screw shaft and they are 5/16 x 18. Don't know if someone cut new threads in shaft and put new outside nut on But it appears that is the case because the inside nut holding dial on screw shaft and the threading on this undamaged part of shaft is 5/16 x 24. There just cant be shaft with these 2 different tpi's on it, can there??
b. How to fix it ? The pin on inside of handle no longer is held in the damaged slot on shaft securely and pin itself may be damaged as well. Thinking my options are to either (i) drill out old pin in handle, clean up slot and insert new possible larger pin to fit in slot more securely or (ii) drill out pin, have keyway recess cut in handle bore to fit new square key stock ? Has anyone run into problem like this? In either case, I still have issue with the mismatched threads on end of screw shaft.

Thanks for any and all assistance here as I try to get this lathe back up to running condition again. I am newbie here and have benefitted greatly from all the advice kindly offered to others and shared on this forum.
thanks,
Adman11

 

[markba633csi]

Logan could probably sell you a new backgear- you might not want to know the cost
Sometimes they can be fixed by brazing or welding and cutting new teeth- Paki process

You should be able to improvise a puller with some hefty threaded rod, nuts and washers and a piece of pipe
I'm not sure of the exact procedure for a Logan, you'll have to study how it's put together

On the compound screw I'm pretty sure the dual threads are not factory- someone did that
You might want to replace the screw, but your first proposed fix is easy to try- you don't have much to lose

At some point you'll realize you need a second lathe to fix the first
(Plus welder, milling machine, dividing head, gear cutters, etc, etc.)

 

[Adman11]

Thanks for responses and input, Mark. It is helpful.

Price for that backgear from Logan may be out of my range for the near future until I see how everything else works. Hoping to find one pop up through this site, on ebay or used pulley shaft with gear but no luck so far...

If it were just one missing tooth, I might venture repair by brazing, but 6 teeth would be daunting and time consuming for me to even try.

Will drill out pin in handle, and assess options from there. The whole pin thing in handle vs a square key to fit in a slot already cut in handle seems like a design flaw to save on broaching handle bore. Maybe there is just not that much torque expected on handle (or bad dissasembly/misuse by owner), but I don't recall ever hearing of just a fixed pin to fit into a slot, especially in a threaded shaft.

Your comment about needing another lathe to fix this one (plus other tools) made me laugh as I don't think I can convince boss for another purchase. (I have older Seneca Falls lathe which I know little about which I disassembled to make room for this Logan 210. Will post some photos of that later in hopes that someone can use that or parts. I've got welder, oxy torch, but sadly no mill (or really no space for a real mill).

Again, thank you for your assistance.
Best
Adman

 

[Shiseiji]

Hi all, I am new member and have above lathe serial number 33490 which is new to me but appears to be about 1945 vintage. In cleaning up this lathe, I have come across following preliminary issues:

1. Cone Spindle Gear for engaging backgears is missing 6 stripped teeth so will need to locate new one part LA-119-1 if anyone has one... Pressing out old bushing and gear looks to be a process due to lack of room to fit a puller or a push rod from pulley end.

2. Compound Slide: Have removed from cross slide
a. Removed ball crank handle and outside nut. Handle has nub of pin going through bore into slot/keyway groove cut into end of the screw shaft, but there is no key (only that pin..) . That shaft end has damaged threads presumably from someone turning or pulling handle off when it was not in that cut slot. I measured threads on both the outside nut and the end of screw shaft and they are 5/16 x 18. Don't know if someone cut new threads in shaft and put new outside nut on But it appears that is the case because the inside nut holding dial on screw shaft and the threading on this undamaged part of shaft is 5/16 x 24. There just cant be shaft with these 2 different tpi's on it, can there??
b. How to fix it ? The pin on inside of handle no longer is held in the damaged slot on shaft securely and pin itself may be damaged as well. Thinking my options are to either (i) drill out old pin in handle, clean up slot and insert new possible larger pin to fit in slot more securely or (ii) drill out pin, have keyway recess cut in handle bore to fit new square key stock ? Has anyone run into problem like this? In either case, I still have issue with the mismatched threads on end of screw shaft.

Thanks for any and all assistance here as I try to get this lathe back up to running condition again. I am newbie here and have benefitted greatly from all the advice kindly offered to others and shared on this forum.
thanks,
Adman11

Hi Adam.
1. Logan Lathe , post in the general wants,eBay as you noted, ask on the Groups.io Logan Forum or try the FaceBook Logan forum.
2. Yep, that's a mess. Below is the from the Logan general parts catalog vs. machine specific:








A roll pin will work just fine. Monarch used taper pins extensively, handles, feed shaft, etc. and if you want to grit teeth and "Buy once, cry once" I'd probably use a taper pin. "But" roller pin will be just fine. How loose was the nut on the back side of the handle next to the micrometer dial? If there was a gap, all that's needed is the best you can do and still turn the dial. Because the dial has to turn, it's impossible to get all of the backlash out of the compound or cross slide. It's possible to reduce it more by counterboring the back of the dial and using an Oilite bearing or a flat roller bearing, Both fixes are under $15 USA.

 

[Shiseiji]

Logan could probably sell you a new backgear- you might not want to know the cost
Sometimes they can be fixed by brazing or welding and cutting new teeth- Paki process

You should be able to improvise a puller with some hefty threaded rod, nuts and washers and a piece of pipe
I'm not sure of the exact procedure for a Logan, you'll have to study how it's put together

On the compound screw I'm pretty sure the dual threads are not factory- someone did that
You might want to replace the screw, but your first proposed fix is easy to try- you don't have much to lose

At some point you'll realize you need a second lathe to fix the first
(Plus welder, milling machine, dividing head, gear cutters, etc, etc.)

FYI, both here and on the Groups.io forum the spindle removal process and work around tools is well documented. Do a Logan Forum specific search.

 

[Adman11]

Thanks for the advice and information, Shiseiji, much appreciated. I will check in the sites you listed for the LA-119-1 cone spindle gear and hope one is located. I've already removed spindle shaft once for cleaning and repacking bearings using the info on this site and will focus on recommended procedures for removing the cone spindle gear when I actually have replacement part in hand.

Will drill out old pin in compound handle and assess what will work to locate handle securely in slot on screw shaft. I will need to try to clean up threads back to original 5/16 x 24 on output end of shaft and see where I am then. As noted, the hack job on these threads may make it difficult to the new rollpin or taper pin to be held securely in slot so may need to slightly deepen the slot so that pin sets deeper. Threading hole in handle to accept a set screw may be another option.

Thanks for advice on backlash fixes for dial. I will dig deeper into that...

 

[Shiseiji]

Thanks for advice on backlash fixes for dial. I will dig deeper into that...

Particularly the cross slide backlash has been a sub-hobby. Scott Logan posted quite a bit of information in the Groups forum. Winky's Workshop on YouTube has dial improvement but I don't think he covered the backlash. Most people address it with an extended bushing/slip over and different ways of extending the shaft so a new larger dial won't hit the compound. There are a couple of Southbend conversions here. If you are interested I have a 90% done KISS option that I can provide details on. The remaining 10% is on the top of the "I'm a gunna." list LOL.