Posts: 10
Threads: 2
Joined: Dec 2019
Location: Hailsham
That's Brill thanks, I'll have it apart Monday and see what's going on, hopefully it's just missing a keyway as opposed to broken, parts seem to be a pain to come by!
Posts: 10
Threads: 2
Joined: Dec 2019
Location: Hailsham
I have taken it apart, the Selector sleeve is indeed keyed to the lead screw, by leaving the bolts loose in the opposite end bearing it rotates fine now, I believe it has a slight bend in the screw, however when I engage the power feed it stalls the screw, like the load is too much, same happens if I tighten the end bearing, should it stall if too much load is applied? Seems odd as surely taking a deep cut on power feed would be quite a load? Not sure what to do next, thanks
Posts: 4,461
Threads: 184
Joined: Feb 2012
Location: Missouri, USA
It sounds like you didn't actually remove and disassemble the reverse gear assembly from the lathe, so all I can offer is this. It seems to be either a key or the pin has sheared off in your gear set. The fact that the lead screw started turning at all was a result of friction between two parts instead of being solidly connected via the key or the pin. I am assuming that key is an integral part of the inside of the collar and not a separate piece, as in molded in to the collar itself. (Zamak?)
Questions:
Are the
dogs of collar
fully engaging into each end of the drive gears? (Power is transmitted to the lead screw through different paths depending on the direction.)
With the lathe running and the lead screw is 'stalled' can you see if the drive gear (9-48B) is turning or not?
If you remove the collar (completely) can you see a fully formed key sticking out inside the bore?
It's actually a pretty simple mechanism, but you are going to have to take apart in order to fix it anyway. Like 'Nike' says... Just Do It!
Willie
Posts: 10
Threads: 2
Joined: Dec 2019
Location: Hailsham
I only had a few minutes so I didn't pull the whole thing off, yes when the lead screw stalls as does the first gear of the "diff" however when the lead screw is out and the change gear is removed I cannot turn the diff gear separately to the shaft, feels pretty fixed and everything engages fine, I'll see if I get time tomorrow to have the whole lot off.
Posts: 4,461
Threads: 184
Joined: Feb 2012
Location: Missouri, USA
After doing a little more searching I found a video you may find helpful.
https://www.youtube.com/watch?v=gwg232nf_e8
Toward the end of the video I was finally able to get a look at one end the end of shift collar. The 'key' for the collar is actually one of the dogs that is oversize (extended) more than the rest so that it slides into the keyway on the lead screw. I'm guessing you'll find that dog has been sheared off most likely. Personally I would still check the pin on the drive pinion though. Even though it feels secure it could still be cracked or partially sheared.
Willie
Posts: 2,328
Threads: 271
Joined: Jun 2014
Location: La Libertad, Philippines
I highly recommend obtaining the parts manual for your lathe as it will make restoration/repair much easier. If you do not have one I found this source:
https://ozarktoolmanuals.com/ozarkshopta...craftsman/
No connection to the seller.
I'm also certain there are other sellers of the manual and probably one or more in merry old England which would eliminate customs and international shipping.
