Moddage
Aluminum
- Joined
- Jan 23, 2021
Hello fellow 10EE enthusiasts, owners, geeks?
I’ve been lurking this forum on occasion for a while now, not really sure why I never made an account until now... anyway, I acquired a 1942 10EE last year, and it’s in need of some love, but overall is in good condition and quite well equipped. I have to go through everything to be sure still, but it appears most of the original accessories are present as well, including the seemingly elusive and rather rare follow rest, and matching early style tool cabinet. I will probably make a separate post about the lathe itself and the journey of repairing it.
Anyway, I’ve been working on fixing the tailstock clamp lever, it’s been apart before me, what appears to be multiple times, and when I got it the tailstock wouldn’t clamp properly. I thought it was out of adjustment so I snugged the large nut a little and was greeted with the handle/lever slipping on the shaft...
Prior to the teardown and visual inspection I made a custom fastener out of a 5/16-18 socket head cap screw with a pin built into it that positively locates and retains the handle on the shaft, thinking the issue was the standard set screw that had been installed was simply slipping and didn’t belong. (Why else would the shaft have a locating/retention hole in it?). Upon installing the new fastener and attempting to clamp the tail stock, I learned that the eccentric isn’t able to rotate far enough toward TDC to actually lock in place and is pulled back down from the tension.
I dismantled the tailstock base and after searching through lots of photos/videos on here, google, and YouTube, I've managed to work out that the handle operation is unlocked when pointed up, and locked when pointed toward the rear of the machine, is that correct? I also noted that some machines seem to have the set screw or perhaps just a retaining pin like the knobs in a similar spot to my lever, and some seem to have it about 90 clockwise (where my shaft I think is lined up correctly but I'm also unsure). I even found a lower resolution and slightly blurry image that appears as though there may have been both a pin in one location (about where I think the shaft hole goes) and a set screw in another, but the resolution wasn't good enough to be certain.
Someone, or multiple people more likely, have had this lever off before, and there are marks from a set screw being tightened into it in several places around its OD and it's a little boogered up. I suspect perhaps the eccentric shaft and lever were not an original matched pair and that's why it doesn't orient and work correctly, but that's just a theory. My other theory is that the original lever and shaft fit were a press fit and at some point that got worn out and someone attempted to fix it by drilling a hole through the lever and shaft together as one, and pinning it or installing a custom fastener/pin hybrid like I made up, but wasn't paying attention and clocked the eccentric wrong. The hole in the lever and the shaft are both off center slightly, and I feel like Monarch would have had a higher level of precision for such an operation, but again that's just a theory.
Picture of the tailstock disassembled, and a closeup of the damaged shaft.
Shaft and lever hole aligned, the eccentric seems to point too far toward the front of the lathe.
Shaft and lever holes clocked roughly 90 apart, eccentric seems to be oriented more appropriately.
Is 5/16-18 the correct thread for the retaining screw(if there was even supposed to be one), or has that been modified?
What is the correct orientation/indexing of the eccentric lobe when the tailstock is clamped, relative to lever position?
Is the original fastener some custom piece with threads and pin as one like I made?
Is there even supposed to be a pin?
Is there supposed to be a hole in the shaft?
Thanks in advance for any help, it will be much appreciated, and I plan to lean on the community for some other repairs I need to make as well, the threading gearbox has something wrong internally and won’t stay engaged among other little things. This machine came from a manufacturing facility and I believe was originally delivered there from new, and based on some things I’ve seen and “apprentice marks” in some areas where they have no business being, it was not serviced by persons who were very meticulous or came from a precision background... but now it’s safe and in my care and nothing major is damaged.
I’ve been lurking this forum on occasion for a while now, not really sure why I never made an account until now... anyway, I acquired a 1942 10EE last year, and it’s in need of some love, but overall is in good condition and quite well equipped. I have to go through everything to be sure still, but it appears most of the original accessories are present as well, including the seemingly elusive and rather rare follow rest, and matching early style tool cabinet. I will probably make a separate post about the lathe itself and the journey of repairing it.
Anyway, I’ve been working on fixing the tailstock clamp lever, it’s been apart before me, what appears to be multiple times, and when I got it the tailstock wouldn’t clamp properly. I thought it was out of adjustment so I snugged the large nut a little and was greeted with the handle/lever slipping on the shaft...
Prior to the teardown and visual inspection I made a custom fastener out of a 5/16-18 socket head cap screw with a pin built into it that positively locates and retains the handle on the shaft, thinking the issue was the standard set screw that had been installed was simply slipping and didn’t belong. (Why else would the shaft have a locating/retention hole in it?). Upon installing the new fastener and attempting to clamp the tail stock, I learned that the eccentric isn’t able to rotate far enough toward TDC to actually lock in place and is pulled back down from the tension.
I dismantled the tailstock base and after searching through lots of photos/videos on here, google, and YouTube, I've managed to work out that the handle operation is unlocked when pointed up, and locked when pointed toward the rear of the machine, is that correct? I also noted that some machines seem to have the set screw or perhaps just a retaining pin like the knobs in a similar spot to my lever, and some seem to have it about 90 clockwise (where my shaft I think is lined up correctly but I'm also unsure). I even found a lower resolution and slightly blurry image that appears as though there may have been both a pin in one location (about where I think the shaft hole goes) and a set screw in another, but the resolution wasn't good enough to be certain.
Someone, or multiple people more likely, have had this lever off before, and there are marks from a set screw being tightened into it in several places around its OD and it's a little boogered up. I suspect perhaps the eccentric shaft and lever were not an original matched pair and that's why it doesn't orient and work correctly, but that's just a theory. My other theory is that the original lever and shaft fit were a press fit and at some point that got worn out and someone attempted to fix it by drilling a hole through the lever and shaft together as one, and pinning it or installing a custom fastener/pin hybrid like I made up, but wasn't paying attention and clocked the eccentric wrong. The hole in the lever and the shaft are both off center slightly, and I feel like Monarch would have had a higher level of precision for such an operation, but again that's just a theory.
Picture of the tailstock disassembled, and a closeup of the damaged shaft.
Shaft and lever hole aligned, the eccentric seems to point too far toward the front of the lathe.
Shaft and lever holes clocked roughly 90 apart, eccentric seems to be oriented more appropriately.
Is 5/16-18 the correct thread for the retaining screw(if there was even supposed to be one), or has that been modified?
What is the correct orientation/indexing of the eccentric lobe when the tailstock is clamped, relative to lever position?
Is the original fastener some custom piece with threads and pin as one like I made?
Is there even supposed to be a pin?
Is there supposed to be a hole in the shaft?
Thanks in advance for any help, it will be much appreciated, and I plan to lean on the community for some other repairs I need to make as well, the threading gearbox has something wrong internally and won’t stay engaged among other little things. This machine came from a manufacturing facility and I believe was originally delivered there from new, and based on some things I’ve seen and “apprentice marks” in some areas where they have no business being, it was not serviced by persons who were very meticulous or came from a precision background... but now it’s safe and in my care and nothing major is damaged.
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