Metalwork - Lathe and Mill topics

Sunday, 3 September 2023

Re: [atlas-craftsman IO] OT-how to test and repair DC brushed motors.

Had to order brushes. https://www.dcmotorparts.com/ in Princeton, WV, is a good place for motor brushes, and you can search by size. Got 4 brushes, shipped, for about $30, and here in three days. Would have been faster if USPS hadn't lost the package for a day. First motor is running. Looks like I need to create a wiring diagram, and make sure the replacement relay I bought for it is the right one, because the controller isn't working, thought the motor spins on the bench.
https://www.dcmotorparts.com/
I'm also considering skimming both commutators, though the one I've already seen doesn't look all that bad. Just because I have them apart enough to do it easily. What I don't have is the special tooling to do that. Does not look like there is any mica to undercut. Have seen a ground hacksaw blade used for that purpose, so don't know if I need the specialty tooling. And no idea how many more motors I might need to work on...

Somebody stop me before I eBay again! ;P

Never found the missing parts, so I'm headed out to the shop to see If I can make a couple of matching brass brush covers. The two Themac J-3 tool post grinders I wound up with both have more complex brush covers: One on the left is the other one of what I lost. The other two will screw down into the brush holders, but are slightly different in size. I'm going to try ordering some that should be the correct one from Grainger, where they're $2.29 each, which isn't bad, and I can pick them up so not pay shipping, but the earliest they could be here now is after 4PM on Friday. $4.98, so I went ahead and ordered them. The brushes, if I got them from Grainger would be $26.76 each. DC Motor sold them to me for $5.13 each. Probably should have asked if they had the brush caps, but didn't think of it then. ;)

Got a package of 50 of the 8-32 kep-nuts from amazon for under $8 last weekend. I now have LOTS of spares! :)

Bill in OKC

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Tuesday, 15 August 2023

Re: [atlas-craftsman IO] OT-how to test and repair DC brushed motors.

Nothing was too stale for someone away at school...

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Monday, 14 August 2023

Re: [atlas-craftsman IO] OT-how to test and repair DC brushed motors.

When I was away in school, my dad would send me stuff packed in popcorn. Real popcorn. I ate it if it wasn't too stale.

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Re: [electronics101] Test Connections for Thru Hole PCBs

Thanks Roy. That's exactly what I was looking for. Got some on order.

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Sunday, 13 August 2023

Re: [atlas-craftsman IO] OT-how to test and repair DC brushed motors.

They had those peanuts that ya could just pour water over & they dissolved . Wonder what happened to them , I haven't seen any in several years ?

animal

On 8/13/23 4:42 AM, mondosmetals wrote:

"Note: Enclose a $50 surcharge for using packing peanuts/popcorn!"

ROFL! You really do hate those foam nuggets!

I have an old Craftsman motor that runs but has a short 110V to the housing when running. Don't troubleshoot here in this forum, I will contact you through your ad on Hemming's when I am ready to deal with it.

Raymond

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Re: [electronics101] Test Connections for Thru Hole PCBs

On Saturday 12 August 2023 02:56:44 pm James AG5VE via groups.io wrote:
> Does anyone have a recommendation for a device to "plug" into a thru hole location to attach a test probe, meter, oscilloscope lead, etc?
> I need a way to temporarily connect off board pots for testing. The pots don't actually get soldered in place until the whole assembly is placed in the enclosure.
>
> Any advice would be greatly appreciated.
>
> James

Perhaps something like this?

https://www.adafruit.com/product/3825

In scrapping stuff, I have encountered two kinds, one of which has square corners and is often used for wire wrap. The other is round with a larger section on the top that prevents a hook-type clip from slipping off. I label them "stakes" in my pile of stuff, but didn't encounter them in a quick search of "test points".

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

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Re: [atlas-craftsman IO] OT-how to test and repair DC brushed motors.

"Note: Enclose a $50 surcharge for using packing peanuts/popcorn!"

ROFL! You really do hate those foam nuggets!

I have an old Craftsman motor that runs but has a short 110V to the housing when running. Don't troubleshoot here in this forum, I will contact you through your ad on Hemming's when I am ready to deal with it.

Raymond

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