Are these Litton encoders worth re-using in a retrofit?

[Jackal66]

Hello,

I am retrofitting my Hurco mill and was wondering about these Litton encoders.

Surprisingly, they weren't covered with oil and swarf when the covers came off.

Would it be better to just go with a newer modern encoder, or is there any drawbacks to these?











Thanks,

JAckal

[Al_The_Man]

The 8 wires would indicate they are differential encoders, and I believe the 0248 is the encoder count in pulses/rev.
The catch is whether thread locker has been used to set the encoder disk set screw on the shaft?
Al.

[vger]

Looks like they were made in 1985. I might differ with Al on the resolution... with the clarity of the shot that shows the wheel, I would think 248 PPR would have visible lines on the wheel. They may be 1000 PPR.

If you decide to replace them with newer... and the set screws are thread-locked... Try sacrificing an allen wrench in fire to remove the screws. Heat the end of the allen wrench just to red hot then quickly insert it in the screw and loosen. Most thread lockers will soften with enough heat. Your allen will not be as hard as it was before heating.

Steve

[Al_The_Man]

Yeah, I see now the 1000 on the number above!!
Al.

[Jackal66]

Thanks for the info guys.

Do I need to take these off so I can clean the disc with rubbing alcohol and inspect all of the solder joints?

Thanks again,

JAckal

[Al_The_Man]

The disk looks like it is easily accessible so it should be easy to clean if you have to.
Don't try and take them off unless you really have to.
Al.

[bloke]

If you take them apart, chances are you'll need a scope to set them back up again. These replaced the two-piece encoders that were mounted directly to the motors without a standoff and coupling.