Craftsman / Atlas Lathe 101.07403 Ser 30948

[anthonyc]

Hello all.
I just made a purchase of my first Lathe, a Craftsman / Atlas 101.07403 Ser 30948. (light Green or Mint Green in color)
Can anyone tell me the year it was manufactured?
It really needs a lot of love. Some of it came in boxes. I already ordered some of the parts that were missing.
The motor that came with it is not correct. Can someone recommend the correct motor. The motor pulley is 5/8 ID.
Im thing at least a 1/2 HP. Is 110v or 220v better? What about the motor frame? Is the motor mounting plate standard?
What size belt is needed from the motor to the counter shaft? The spindle belt is .50 x 32 In.
I need to break it down for a good cleaning. What do you recommend to remove rust from the ways.

Any help is much appreciated
Thank You

 

[ARC-170]

I've restored two 101.07403 lathes. I can't seem to find the thread, though. I'll look and post a link at some point.

When you take it apart, the bearing dates will be on the bearings. Your lathe was made around that date.

Mine did not have the original motor; I have a 2-speed one. It's 110V.

I use the green link belts from Harbor Freight that allow you to change and adjust them.

I used a non-abrasive Scotch pad and elbow grease, IIRC, to remove rust. I think I also used kerosene. I bought it at Home depot/Lowes. It's in the section for outdoor tiki torches.

I'm watching this thread, so feel free to post any questions! Have fun and welcome!

 

[ARC-170]

Found it!

ARC-170's Craftsman 101.07403 lathe restoration thread

I just bought a Craftsman 101.07403 lathe. It is in dire need of taking apart, cleaning and lubing. I have some questions: 1. The spindle bearing might be shot. It turns by hand but feels "crunchy" (I believe that is the proper technical term). Could need replacing. How do I get it out to tell...

www.hobby-machinist.com

 

[markba633csi]

Have you considered a variable speed motor? It's a great feature to have
Some folks do it for almost zero cost, if you can cannibalize an old treadmill
-Mark

 

[FOMOGO]

Look under the forums section above for Atlas machine's, and you will find a wealth of info. There are also manuals and parts breakdowns in there also, if memory serves. I have a 12x36 (54" bed) Atlas/Craftsman lathe that I got years ago, in three or four boxes of parts. It taught me a lot about lathes putting it back together, and getting it operational, and it has done a lot of good work for me. I think the standard motors were all 1720 rpm. Welcome to the forum. Mike

 

[wa5cab]

Anthony,

Welcome to H-M.

From the photo that you posted, the machine appears to be in fairly good condition. but perhaps in need of TLC. Please confirm that the nameplate with model and serial number is riveted to the right end of the bed. Are the characters 12L also on it?

The factory recommended motor was 1/3 or 1/2 HP. Putting anything larger on it won't make it any more capable and if you should ever (Heaven forbid) have a crash, will only serve to increase the damage. The correct motor frame # for a 5/8" shaft is 56, independent of horsepower. If you have ready access to a 240 V single phase supply, or if gaining access won't cost you an arm and a leg, go with that. Otherwise, a 120 VAC capacitor start motor will be OK.

The correct motor belt is a 4L350. The correct spindle belt is a 4L310 but the 4l320 that you apparently have will probably work OK. I do not want to re-start the argument over link belts and am serving notice to the members that they will not, either.

On the subject of bearing dates, from about 1939 until early 1953, someone (most likely at Timken), hand engraved the inspection date onto the spindle bearings (both cups and both cones). From your serial number, your machine may or may not have dates on the bearings. Should you ever for any reason have to pull the spindle, please report the dates if present or if not, report that. Include serial and model number as well. Otherwise, you machine was probably made in early 1953.

 

[anthonyc]

Thank you wa5cab,

Would you happen to know the correct pulley for the motor ? Should it be a two position pulley?
I have two pulleys, a single 3" dia with 1/2 shaft and a four position 1 3/4", 2 1/2", 3 1/4" and 4" with 5/8 shaft.
That motor belt will connect to the countershaft pulley that only has two sizes available
..... These parts were in a box so bear with me.
The book calls out a 1/2 or 3/4 HP motor. But says nothing about the pulley size or the belt. I think a 1/2 HP motor with a 1/2" shaft is plenty of power. It did come with a motor. Its 1/3 HP. I rewired it and it works. However it will not mount to the motor mount There is a electrical box on the side of the motor and of course its in the way. It seems this motor was not original to the Lathe.
Im not a fan of link belts. Why should I spend $35 when a V belt is $6.35 It looks like I need to pull the spindle in order to change out the belt.
At this point everything is apart and I am cleaning everything.
I used a flat steel block, oil and some 400 paper to dress the ways and followed up with scotchbrite.
Other than lots of missing parts loose screws and bolts it looks to be in reasonable condition.
I need to find the spacer that resides in the back of the carriage. Without that I have no adjustment.
The wipers need replacing. Do you happen to know of a source?

Then there is the box of gears.
No, I haven't gotten that far.

I did find the parts list and that was a big help.

 

[anthonyc]

I found this on market place would this motor work for my application.

 

[markba633csi]

That looks fine, if it will fit your motor mount
-Mark

 

[wa5cab]

First the motor - Yes, it would work. However, you don't have the switch to take advantage of the two speeds and have no real need if them anyway and the machine will already do 16 speeds. You could of course just ignore the slow speed and wire it up so that the motor always runs @ 1725 nominal.

However, the motor has an automatic reset thermal breaker, which is generally considered unsafe for any machine with an operator. The reason that it is unsafe is that if it does trip, and you don't remember to return the FWD-OFF-REV switch to the OFF position, when it cools off a little, it will re-start with no warning. Depending upon what you are doing when it suddenly and with no warning restarts, you could lose a hand or worse. It is good to have the thermal overload breaker. But it must be the manual reset type. So unless you need an unattended fan motor for something else, don't buy it.

We don't have the factory drawing for the 2-groove 5/8" bore motor pulley but we do have an independent copy that several successful pulleys have been made from. However, access to the Downloads area requires Donor status.

The 4-groove pulley that you have is probably the cone pulley for the countershaft. If the outside of it looks just like the spindle cone pulley and it has a key way or groove for a Woodruff key. that's what it is. And if you don;'t have a 5/8" bore small 2-groove pulley, the PO must have lost it. The Atlas 10-428 5/8" bore motor pulley is approximately 4.390" OD for the large groove and 1.930" OD for the small groove. Both the spindle belt and the motor belt are 1/2" FHP belts. Do not use a Multiple V-belt. Although the 1/2" ones may look about the same, they aren't. The only application that Atlas ever used one on was as the two spindle belts for the late 12" cabinet models. I gave you the motor belt Industry part number yesterday. You can probably buy it locally but if you are going to place an order with Clausing for the motor pulley or anything else, you may as well get it from them. Their part number is L3-125. And their phone number is 800-323-0972 or 800-535-6553. When you finally get the operator on the line, ask for old Atlas parts.