Kearns S-type small (!) horizontal borer

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MRA

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Hi folks

An antique engine museum where I do some volunteering has just acquired one of these machines. Here's some pictures of someone else's:

https://insta-stalker.com/post/BtTiw_hgxg0/

I know this is a bit big for a model engineering forum, but I thought someone might be able to point me in the right direction.

One can run it with the tool concentric with the spindle - for example with a drill bit or an end mill in it - but if you want to run a fly cutter then rather than setting the cut diameter on some kind of boring head as one might on a Bridgeport, one can set the tool across on the machine itself. A pair of T slots on the head and some kind of feed screw inside make this happen, as you might be able to imagine from looking at the pictures.

The tailstock moves up and down (with vernier scales for alignment with the headstock - OK). But the bearing in it will obviously always need the tool to be concentric with the spindle if one uses a boring bar supported at both ends.

We've been discussing what kind of attachment would be required for a boring bar were it to be supported in the tailstock, to allow the tool to be set over using the adjustment present at the other end - as opposed to running it all concentric with the spindle and adjusting the 'stick out' of the tool to set the cut diameter. Not having any experience with this kind of tool I don't know if there's a standard way to do this - or (forgive me) the right terminology to describe it. We have some ideas, but I thought it might not hurt to ask here too.

cheers
Mark
 

k2steve

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That machine is a Horizontal Boring Mill. That is a face plate on the head. Nice little machine you have there.
 

rklopp

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I think your machine has an automatic facing head. You would not use that in conjunction with the outboard support.
 

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