My son-in-law works for a junk removal specialist. He occasionally "saves" some interesting stuff for me. He loves gooney looking machine parts for his shelf, but if it is useful I get to snag it for my shop.
Looks like an adjustable boring head with a weldon shank to me.
Is there a patent number on it anywhere?
yah, id say boring bar
Boring head that's used in the spindle of a milling machine or jig borer.
This is all reminding me of the old story about the Yellow Pages cross-reference that read, "Boring - see Engineers."
Boring is also my guess. It looks as if it has to go into the mill. I have now freed up the mechanism (there's a gear inside. Now if I turn the big ring marked 0 - 50 it turns the little index marked 0-10. The whole thing slides the chuck to the side. There is a limit index (threaded rod with set-screw collar).
If you turn the ring one mark it gives about 2.5 thou offset. So the boring bar offset can be moved very accurately... obviously not a model T tool! I guess it is designed for boring holes around 1/2" - maybe 3" on the mill. I guess I'm ready to chuck it up and ruin some parts!
TH
gee, wher is Are rezident macheening Expurt wen yoo nede Him?
Since it has the rotable upper ring and something to hold to body still (the side screw) it could be a boring and facing head.
I.E., capable of feeding the cutting tool side ways, as in facing off the top of a boss, or squaring up the bottom of a bore, etc..
Here is a different one in use.
http://img.photobucket.com/albums/v337/johnoder/Fix%204%20x%206%20Bandsaw/Dcp_06 72.jpg
If you find yourself in a boring bar your in the wrong place!
Its a boring head that fits in the spindle of a mill. You can bore true diameter holes from small hole to the max diameter of what the head expands to. All that is missing is the boring bar.
Robert and all: thanks. I assume you have to drill a starter hole so you can get the boring bar and tool inside. Then you rotate the ring and bore... over and over until you have the diameter you are after.
I would love to see a photo of the boring bar used... is it just like a plain boring bar I would use in my lathe?
TH
In an old Bridgeport, the jig was a copy of one Dean Yoder built.
Assuming as I suggested - that it is a boring and facing head - holding the ring stationary while the head is rotating will cause the tool to feed to the side and take a facing cut.
Bob shows an ordinary boring head, with no ring. He would move the tool (to take a boring cut) with the dial he is showing in his photo.
Though not shown in your photos, Terry, is there a hex hole centered in your dial? If so, stick the right size Allen wrench in there and move the tool with that.
The ring is just for facing cuts.