head stock bearings monarch 60

idacal · Jun 3, 2020

I pulled the headstock bearings on my lathe because my finishes have gotten horrible, after getting them out, my races are scratched up and so Im I'm going to replace them . the numbers are just basic bearings is there something Im missing here or have they been changed before?

idacal · Jun 3, 2020

the other thing it doesn't look like there is any thrust bearings just 2 taper bearings and a ball bearing in the middle

MichaelP · Jun 3, 2020

Call Monarch. Based on the Ser#., they'll tell you exactly what should be there. While you at it, ask them what it costs to buy the replacement from them. Just in case, make sure you sit down before they reply.

Baitshop · Jun 4, 2020

Did you try tightening up the nuts on the back to take the backlash out of it? If you put a decent sized bar in the chuck you can pull on it with an indicator on the chuck and see how much it wiggles. It's hard for me to imagine those huge bearings being the root cause of poor finish.

johnoder · Jun 4, 2020

Timken originals would have been Class 0 precision - considerably better in the assembled runout department compared to Class 2 gear box bearings

All the Class 0 Timkens I have held in my hand had the Class 0 scribbled on the bearing with some sort of hand held etching process - that is because they were individually selected from a pile of not quite up to snuff brethren bearings

Here are some related scans from Timken Engineering

Note 1.5 "tenths" on Class 0 and 15 "tenths" on Class 2 for assembled run out

idacal · Jun 4, 2020

got my quote from monarch little over 6000.00 so thats a no go. I got the numbers now so will start shopping eBay I put the lathe back together and will just use it
but thanks for all the help one of the races had 6/53 etched into it. should these bearings have a little preload?

Phil in Montana · Jun 4, 2020

Class "0" timkins are going to be outrageous in cost, and nothing else will do, show bigger, better pics of races, maybe there not that bad...Phil

Rob F. · Jun 4, 2020

idacal said:
the other thing it doesn't look like there is any thrust bearings just 2 taper bearings and a ball bearing in the middle

Why would you need a thrust bearing with two opposing tapered bearings?

idacal · Jun 5, 2020

I already reasembled it snugged upnthe bearings we have. the lathe Has quite a bit of wear in the ways so there is no point in spending 6 grand in bearings. they are bad enough that in a gearbox i would have changed them out If available local. There will be some class 3 or 0 show up on ebay eventually and this lathe is easly disassembled. I figured there would be a thrust bearing for heavy drilling forces nope just 2 tapered bearings like an axle

johnoder · Jun 5, 2020

Say at least a cone (the piece with rollers) number and I'll tell you the thrust rating - which will be CERTAINLY high enough

ATW put it right in the catalog - 9250 Lbs on the little machines and 17K on the big one

ON EDIT

I see the 639 n the photos - that would be the front and its thrust rating is 5950 Lbs

Here is a page scan from 1983

WillWilly · Jun 15, 2020

My CY16 had a class 3 originally installed. Per Johnoder's info, the runout is .0003". I bought a new Timken replacement for $800.

I was surprised to see my bearing was a Class # but it was scribed with date and 3.

Still a mystery as to why my CY had a Class 3 but it was 1943.

Monarch CY 16 Winter Project

This is the link about my bearing story of replacing...

johnoder · Jun 15, 2020

Must of been one of those "git-er-done" situations - the boss of the assy floor saying - effectively - "put the very best we have in there and shoot it out the door - like right now"

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