Moore #3 Spindle bearing test

Froneck · Jul 23, 2021

I purchased a #3 Moore Jig Borer at HGR cheap enough. I do have a #3 with .0001 DRO. I would like to check the spindle bearing when I get the one purchased before getting a DRO for it. It does have the micrometer stop for the ram but my #3 does not. Haven't needed it but for the price I paid for the machine I will get the stop that some guy is selling on ebay for $143 (shipping added) plus a lot of spare parts if the machine is not in good shape though the photos look very good. Don't look abused!
Any suggestions on checking the spindle bearings??

macchi7 · Sep 14, 2021

The quill is sealed and can only be overhauled by Moore, or so it says in their period advertisements. This is due to the special tools required and precision bearings used. There are suggestions on the "General" section of this forum, that a simple test is to run the machine at full speed for 20 minutes, the bearings should not be too hot. Basic, but a start, A factory overhaul is expensive.

Froneck · Sep 16, 2021

Not Hot? Would think worn bearing would not get hot. But I'll try it.

neanderthal mach · Sep 16, 2021

No first hand experience with one, but fwiw I've read Moore used a very high preload on there spindle bearings. Post #6 mentions it here. https://www.practicalmachinist.com/...1487/?highlight=moore+spindle+bearing+preload

MCritchley · Sep 16, 2021

From what i remember- run the quill all the way down- run spindle at max rpm for 15 minutes- if the spindle is running to hot it will not retract into the housing due to the close fit.

This might be published in Moores book, Foundations of mechanical accuracy

Fal Grunt · Sep 17, 2021

macchi7 said:
A factory overhaul is expensive.

A factory overhaul is no expense at all. They will not rebuild a #3 spindle for any amount of money.

They scrapped a warehouse of NOS #3's and semi truck loads of parts, a couple DECADES ago....

At least, that is what MOORE told me when I called looking for service information.

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