View Full Version : Help me put this to use please-P&W "centering" indicator

02-23-2013, 06:56 PM
I purchased an old Pratt & Whitney tool. It has a MT-4 taper, a small T-Slot adjustable DI mount and I suspect is best suited for use in a lathe or mill.
I am lead to understand it is a bore gauge tool but I am wondering if anyone can anyone offer some other uses for it mainly for my lathe which is an old Sheldon EXL-44-B with a MT-5 spindle taper which, of course, I can get a sleeve for to adapt it to MT-4.
http://imagehost.vendio.com/preview/ge/gearhead954/DSC01422.JPG4/DSC01422.JPG (http://imagehost.vendio.com/preview/ge/gearhead954/DSC01422.JPG)

02-24-2013, 04:23 PM
No image! ???


Ohio Mike
02-24-2013, 05:06 PM
What you're describing is a P&W "Work Locating Indicator" which was designed for use on a jig bore to precisely locate work relative to an existing hole. It would be useful on a milling machine too but I'm having a difficult time seeing a productive use for it on a lathe. I'm curious did you get anything else with it other than an indicator? It originally came as a set with a proving bar in a mahogany case.

02-25-2013, 08:17 PM
I hope the image is back?
I have a horizontal mill with a vert attachment and a vertical mill waiting (a long time) for restoration so I think I'll keep it for now.
It appears as if the MT4 taper can be easily changed out to another shaft/taper type.
I didn't get any box or proving bar. Is the proving bar a calibration tool?

https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcRoCRo5WgLUxBR8elFI7mTZYVnoRIF48 WSI17VZnDxqolSPywL7

Ohio Mike
02-25-2013, 11:46 PM
The proving bar was placed in the jig bore spindle and also used to indicate a hole.