Monarch 16-W accuracy

EddieJ3987 · Jan 25, 2021

So I have recently starting dabbling in gunsmithing and have had issues trying to indicate an action in my monarch 16-W. I can get it to run less than a thousandth but as soon as I put my tenth indicator on it I get erratic readings and inconsistent readings as well. Am I asking to much from this lathe? I will add the spindle was hard to turn when I got the lathe and somewhat rough. It looks like someone has fooled with the nut on the back of the spindle so I am assuming someone put new spindle bearings in it. I loosened the nut some what just to see. It smoother out and is much easier to turn.

johnoder · Jan 25, 2021

It came with Class Zero Precision Timken Bearings for spindle about 80 years ago - who knows what some well meaning but uninformed owner put in there in the past

Class Zero Timkens have about 10% of the assembled run out that a Class 2 gear box bearing has that looks exactly the same

Scans from Timken Engineering

As far as "how to" - it is where you find it - like here

http://vintagemachinery.org/pubs/1617/5795.pdf

Have fun

EddieJ3987 said:
So I have recently starting dabbling in gunsmithing and have had issues trying to indicate an action in my monarch 16-W. I can get it to run less than a thousandth but as soon as I put my tenth indicator on it I get erratic readings and inconsistent readings as well. Am I asking to much from this lathe? I will add the spindle was hard to turn when I got the lathe and somewhat rough. It looks like someone has fooled with the nut on the back of the spindle so I am assuming someone put new spindle bearings in it. I loosened the nut some what just to see. It smoother out and is much easier to turn.

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Monarch 16-W accuracy

EddieJ3987

Plastic

johnoder

Diamond

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