OTMT milling machine on Craigslist - any good?

Dave Paine

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I would want to see this operate before I would consider a purchase. The handles should not be a problem to fix or replace, but if the quill is running rough or has too much run-out, then can become a project machine in a very short time.

The head is heavy. Make sure the Z axis handle and gears work well to move the head up and down.
 

COMachinist

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Wow wish it was in Colorado. I would buy it to turn for profit or CNC it. We never set any thing like that around here.
CH
 

DiscoDan

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I would want to see this operate before I would consider a purchase. The handles should not be a problem to fix or replace, but if the quill is running rough or has too much run-out, then can become a project machine in a very short time.

The head is heavy. Make sure the Z axis handle and gears work well to move the head up and down.
How much run out is too much?
 
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Lordbeezer

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Would've been gone in 5 minutes around here..cause I would have picked it up
 

Dave Paine

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How much run out is too much?
A simple question but not a simple answer. It depends on the tolerance required for the items you are making. If the runout was X thou and you needed a tolerance of <X thou, you will not be able to make the desired tolerance.

To measure the spindle runout you would need to take a decent collet and end mill than use the shaft of the end mill with dial indicator or test indicator to get a good measurement. Measuring the outside of the spindle is going to have more apparent runout than items in a collet.

I do not know what runout would be expected from this machine when new.

I think you would want runout to be as low as possible, half a thou to a few thou.
 

jdedmon91

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Looks like a bench type mill. Similar to my old PM25. If it moves in both axis freely and not much backlash. It should be ok. Just another small bench mill.


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DiscoDan

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I sent him a message already. Probably just a clean up and flip opportunity for me.
 
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