Re:Hardinge CHNC 1 Lathe

I use the same wsum method on my turret:


except I have a Hal component instead of the PLC.
www.wallacecompany.com/cnc_lathe/HNC/emc2/turret.comp

Unless I was mistaken John was talking about an override encoder, which I think could use a similar technique. The down side is the number of wires needed to go from the operator panel to the EMC PC. That's why I was thinking about using SPI.
--
Kirk Wallace
www.wallacecompany.com/machine_shop/
www.wallacecompany.com/E45/index.html
California, USA

Thanks. I didn't know that halui worked that way with the override.

My encoder had the same rubber covering, but it was falling off, so I removed it. I figured removing it wouldn't make things any worse, so far, so good.
I made new cork gaskets for the cover and installed o-rings and bushings under the cover screws. The area under the turret table was venting air leaks and oil into the encoder area, so I had to fix all of the air leaks. There are two normal air vents in the system, which I think are placed at the ends of the air passages for carrying the air/oil to the ends of the lines. These vent outside though.

You should be able to fix your encoder board fairly easily. The encoder chips are still available:
search.digikey.com/scripts/DkSearch/dksu...l&name=296-3533-5-ND
www.electronics-tutorials.ws/combination/comb_4.html

The Hall switches are common, here is one example, but is in a smaller package:
search.digikey.com/scripts/DkSearch/dksu...5881LUA-ND&x=16&y=17

If you prefer, you could send your board to me and I'll fix and return it for free.
--
Kirk Wallace
www.wallacecompany.com/machine_shop/
www.wallacecompany.com/E45/index.html
California, USA

Looks like a Tantalum bypass capacitor
old Tantalum bypass caps are quite prone to this (shorting out)

It might have some info on the back, I'd clip the leads and see. What power supply does this run on?
Bypasses are not critical so if the power supply is known the capacitor size can be guessed

24V is strange (25 is a standard voltage rating and too low for 24V power)

Unless you can get the original specs I would tend to be cautious and use a 35V capacitor, maybe 2.2 uFor so