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StephenK
11-12-2007, 06:47 PM
I'm helping a friend rebuild an old lathe. It was his Grandfathers and sitting in a barn. The general condition looks good. Covered with protective oil. The part that is to replace is the spindle. The bearing area is all chewed up and worn. Part diameter is 1.250" by 12". Standard chuck thread and morse taper.
What would be the best choice of material to be used for this project?

tony ennis
11-12-2007, 07:42 PM
For a spindle? ebay.

Unless you just really want to make it. What brand/model/type of lathe is it?

Al Messer
11-12-2007, 08:20 PM
4140 Steel would be a good bet in my opinion.

lazlo
11-12-2007, 09:44 PM
Al's right on -- 4140 or 4150 Pre Hard would be great for a spindle. Even better would be LaSalle's ETD-150, or CPM's Maxel 3 1/2, which are "Free Machining" 4150 Pre-Hard. In quotes because machining Pre Hard isn't a walk in the park...

moldmonkey
11-12-2007, 11:41 PM
Not the cheapest but the easiest to order from:

McMaster (http://www.mcmaster.com/ctlg/DisplCtlgPage.aspx?ReqTyp=CATALOG&CtlgPgNbr=3529&RelatedCtlgPgs=3526,3527,3528,3529&fam=steel&ppe=1004&ppr=4&psm=2&psl=5&&sesnextrep=890696098279956&ScreenWidth=1280&McMMainWidth=875&ToolsetID=ToolPageFlip&ToolsetAct=&sesnextrep=890696098279956)

Both 4140PH and ETD150 are on that page. 4140PH requires aggressive feeds & speeds to get a good finish but machines well enough with good tooling. IMHO, I would check out the lathe closely before going to that much trouble.

StephenK
11-13-2007, 09:32 AM
Thanks for you input. I was leaning toward using 4140 and have worked with it in the past.

We could not find any identification on the lathe, perhaps when I'm at the place where it is stored I'll take a better look. There is no rush on the job.

In replying to the thought of going on e-bay, I don't use it and doubt if I ever will.

McMaster is close by and I use them all the time. Call before 9AM and it's delivered in the afternoon. Saves the 20 miles one way to their place.

Thanks again, I'm nearing 75 and need another challange in life.

moldmonkey
11-13-2007, 10:32 AM
Have you considered not going back to a Morse taper but setting it up for collets in the nose? Too little for 5C unfortunately. I don't see the point in Morse in the spindle when you can use a straight shank soft center for between center work. Just a thought.