Robert, Thank you for the information. The bed is 42 inches and 24 inches between centers.Paul,
The Craftsman 101.20140 is a bolt-on replacement. It was made from around 1950 up through about 1965 or 70. The model number of the 101.07403 with QCGB is either 101.27430 (24" between centers) or 101.27440 (36" between centers). I understand that the 101.20145 and 101.201451 can be adapted but I have no details. The latter two fit the 1/2 " bed 12" Commercial machines. Your machine has a 3/8" bed so you might have to start with a 1/8" spacer. The two models built to fit the Atlas 10" might be made to fit, although I've no idea what would be involved other than that you would probably have to make a new change gear bracket (banjo). However, it appears that more of the 101.20140 were made than of the two models for the 10". And more of the 2nd and 3rd variant of the 12" QCGB's were made as they were in production for about 25 years versus about 9 years for the 10" and 7 for the 1st variant 12".
Your machine was probably made in late 1951 or early 1952.
Please post the bed length or the nominal distance between centers of your lathe. Unfortunately, although the Sears catalog number is unique for each bed length, the model number isn't.
You will find the parts manual on the 101.07403 in the Atlas/Craftsman section of Downloads, as well as the installation instructions and parts list of the 101.20140
After re-reading my post, I decided that I had better make clear that the above sentence only applies to the 101.20145 and 101.201451. The 101.20140 is a bolt-on replacement for the change-gear bearing and change gear banjo.Your machine has a 3/8" bed so you might have to start with a 1/8" spacer.
The owners H-M Users ID is Tinkertoy1941 location Hillsdale, Michigan,Tinkertoy,
I moved your post to the Serial Number thread in the Sticky area. I added the three serial numbers to the master database, but please confirm that the first two numbers are 005324 and 008953. Also, please sent me the owner's name or H-M User ID and the location (country/state/city). And confirm that none of them also have the serial number stamped into the top of the left or right knee way.
Unfortunately, there is no accurate way in which to do that. With the Timken bearing equipped 10" and 12" lathes up through the early 1950's, you could, from the date engraved on the spindle bearings, safely state a date that the lathe couldn't possibly be older than, and from our having gathered bearing dates from several dozen machines, feel comfortable with saying that the lathe wasn't made more than about a year later than the later of the two bearing dates. But Atlas (or maybe Timken) didn't date the bearings in any of the other machines that they made.So here's my 7b plate. So how old is it?