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economy oscillating spindle sander quit period

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Forum topic by dumpsternaut posted 02-09-2018 04:11 PM 417 views 0 times favorited 5 replies Add to Favorites Watch
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dumpsternaut

3 posts in 255 days


02-09-2018 04:11 PM

Thanks in advance for your time and any thoughts besides “that’s what you get for going to HF”

I know these things are cheap, white-label jobs but I’m one of those people that gets a lot of use from something like this while “in between better ones” :) When I can, I fix up US stuff needing a rebuild, like my saws and lathe.

This little oscillating spindle sander that common Central Machinery kind with the asymmetrical platform, you see it in Ryobi, Wen etc…

It didn’t stop oscillating—it just didn’t turn on one day. Silent, no hum nothing.
  • Not seized or stuck; Everything hand-turns fine and is all engaged from spindle to motor; it feels like it should.
  • Cable and power source test fine to the switch.
  • Tested the switch—working fine electrically all poles, power makes it past.
    That, to me, meant it was probably the little square rectifier; after all they didn’t heat sink it.
    So I bought a replacement rectifier for $5—but nothing.

Am I not thinking of something?

I guess I’ll bust out the multimeter and test the rectifier’s DC output but I have a feeling now they’re both fine; I checked my wiring / proper placement.
I don’t have a 110v DC power supply to directly test the motor but I do have a 20A 12 or 15 volt DC supply… do you think that would make it spin at all if the motor was OK?
I’m just used to motors, themselves, experiencing issues before just quitting but I guess it could be a problem inside the motor?
If so maybe I’ll see if I’ve already got some free motor and jack it up like Tim Taylor until the gear box gives out. Otherwise it’s landfill now. That stinks; it was working powerfully.
All I do with it is shape a banjo head or something out of softer hardwood and I already need to replace my belt sander and build my large outboard lathe head, so I didn’t have $$ to run out and buy another one of these soon.

-- I'm gonna make a banjo


5 replies so far

View MrUnix's profile

MrUnix

6948 posts in 2347 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

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dumpsternaut

3 posts in 255 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

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MrUnix

6948 posts in 2347 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

559 posts in 2519 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…

-- Lead By Example; Make a Difference

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dumpsternaut

3 posts in 255 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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