broke my craftsman 101

C

capt.ron

Active User
Registered
Joined
Jan 10, 2014
Messages
34
left the carriage feed engaged till it stopped machine now in e gear only it skips like stripped gear could not see any anyone know what i should look for when i take quick change gear box off
 
Doesn't that lathe have a shear pin in the lead screw drive, just outside of the gearbox? It's been a while since I owned one, so I may be thinking of another lathe.
 
i don't know havn't had it apart yet looked with flashlight did not see any stripped gears hope it is a key but don't think so acts like it only dose it in E slot and in all speeds i'm going to take a better look this morning
 
capt.ron said:
i don't know havn't had it apart yet looked with flashlight did not see any stripped gears hope it is a key but don't think so acts like it only dose it in E slot and in all speeds i'm going to take a better look this morning
Click to expand...

I'm pretty sure that you've sheared the "shear pin", I did that years ago on the same type Lathe. The best I remember it's right where the carriage feed screw goes into it's main drive gear. It'll be a tapered pin so make sure that you find the small end before attempting to drive it out. I think (the best I remember) that you can un-bolt the feed screw from the tailstock end of the bed (it'll also be doweled to the bed) and just pull the whole feed screw out, that'll make it easier to remove that part of the shear pin. Hope this helps
OH, make sure the pin that you put back is not a hardened pin. That pin is designed to shear and be the weak point to keep from destroying your gearbox.
 
Last edited:
What model is the machine? Saying that it is a "101" doesn't really tell us anything other than that Atlas built it for Sears. Knowing that it is Craftsman badged and that it has a QCGB only cuts the possible models down to 14 lathe models with 3 gearbox models.

However, unless someone modified the machine, it does not have a shear pin in the lead screw drive system

Robert D.
 
ok little more info might help things out had carriage all way in quick change gear box was engaged in E slot i some how engaged the carriage while i was drilling stopped the lathe twice thought it was the drill bit binding the first time now E slot skips like it has a stripped gear i can't see any the gear box works fine in every slot except E the lathe model number is 101.07403 the quick change model number is 101.20140 i would really like to have a idea what it is before i fool with it never know when i might need to use it
 
I have a qcgb and I just took a look. If your problem is only with E position then you most likely have broken teeth on the small gear for that position. Without E your not going to get any feed speeds so not sure what you can use the lathe for other than cutting threads. Looks like your going to need to replace that gear.



capt.ron said:
ok little more info might help things out had carriage all way in quick change gear box was engaged in E slot i some how engaged the carriage while i was drilling stopped the lathe twice thought it was the drill bit binding the first time now E slot skips like it has a stripped gear i can't see any the gear box works fine in every slot except E the lathe model number is 101.07403 the quick change model number is 101.20140 i would really like to have a idea what it is before i fool with it never know when i might need to use it
Click to expand...
 
You must log in or register to reply here.
Back
Top