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economy oscillating spindle sander quit period

by dumpsternaut
posted 02-09-2018 04:11 PM


5 replies so far

View MrUnix's profile (online now)

MrUnix

7531 posts in 2761 days


#1 posted 02-09-2018 04:43 PM

You can try hooking up the 15vdc supply to the motor – won’t hurt anything and will spin it slow if the motor is good. Also, did you check the brushes?

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View dumpsternaut's profile

dumpsternaut

3 posts in 668 days


#2 posted 02-10-2018 01:24 AM


You can try hooking up the 15vdc supply to the motor – won t hurt anything and will spin it slow if the motor is good. Also, did you check the brushes?

Cheers,
Brad

- MrUnix

No sir MrUnix I did not.
I will learn how to check brushes now, high time! Always learning. You’d think with some of the electronics I’d have learned that. And in the machine shops they never cracked open a motor in 3 of them (should though).
Thanks!

off topic since you’re in FL (Tampa here/Odessa) Wow, flashback (your name) of DEC Digital Equipment corporation mainframes and my fabulous DEC Rainbow that was compatible with IBM clones (PC) until they decided to make their color graphics not so compatible even in MS DOS. I remember a local BBS or two here in Tampa run on CPM instead of DOS….

-- I'm gonna make a banjo

View MrUnix's profile (online now)

MrUnix

7531 posts in 2761 days


#3 posted 02-10-2018 01:33 AM

Wow, flashback (your name) of DEC Digital Equipment corporation mainframes and my fabulous DEC Rainbow that was compatible with IBM clones (PC) until they decided to make their color graphics not so compatible even in MS DOS. I remember a local BBS or two here in Tampa run on CPM instead of DOS….
- dumpsternaut

I pre-date the rainbow :) Became a member of DECUS back in the 70’s, and I’ve used just about every DEC machine made dating back to the PDP-8. Was really sad to see their demise.

Cheers,
Brad

PS: I still have a few Sun Sparcstations for sale if you want a real Unix machine :)

-- Brad in FL - In Dog I trust... everything else is questionable

View MJCD's profile

MJCD

601 posts in 2933 days


#4 posted 02-10-2018 02:56 AM

OMG: PDP-8 & PDP-11 … great machines and a great company; and CPM (which Gates didn’t buy for $75,000 – he bought DOS)... The rest is ancient history. Good Times, though…

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dumpsternaut

3 posts in 668 days


#5 posted 02-10-2018 05:31 AM

haha, well whatever Trak Microwave Corp.’s mainframe was, it had some kind of big data cylinders that looked like I could build a nice wood lathe out of it. Probaby DC, too, for variable speed!

Wow, well checking the brushes was way easier than expected. They’re even mounted semi-externally at the base of the oscillating spindle sander motor. Plenty of carbon brush left. Cleaned it with very very fine emery. Like cleaning a pencil lead, though. Cleaned the carbon off the copper slip ring (?) / commutator (?) but still no life.

OH my word… the cabe and switch tested ok but now not, now I get intermittent 8 to 16 volts AC,,, bad cable I think but of course not when I tested it…
here goes trying to replace the cable—

At least it’s all cleaned up now with a nice wire EDM-cut heat sink and silver goo on the new double duty rectifier etc… now to re-determine which side of the motor was supposed to be dc positive… oops…

thanks—I learned how to maintain carbon motor brushes!

-- I'm gonna make a banjo

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