I have another armature lathe , that I bought 20=30 years back . Had no idea what it was , I have a weakness for things that seem bitchin & much to my wife's dismay I have way to many . It has a short piece of hacksaw blade mounted for cleaning out the slots . After kicking it around for a bunch of years I bought the one I posted earlier & When I did a Ebay search to see what the Tru-Arc armature lathes were going for low & behold there was a guy selling the twin to the old bitchin one , let me see if I can find a link to that one . It's nowhere as fancy as the Tru-arc .

animal

On 7/1/24 10:49 PM, gcvisalia@... wrote:

One can also take a hacksaw blade and use that to clean out the insulation. Some may require a bit of modifying to fit properly.

george

On Monday, July 1, 2024 at 10:42:04 PM PDT, mike allen <animal@...> wrote:

??? Mine is identical to the one I linked . I've seen them on ebay & at some flea markets . the motor has that long skinny shaft with a little star washer kinda lookin cutter that cleans out the grooves on the communicator .? Let me see if I can find a longer youtube on it . Mine is over at a bud's place , We were thinkin on doing some automotive alternator windmills , but life got in the way . I installed some new power in our local NAPA auto parts for their new alternator tester? when he said gimme a bill I told him I wanted the old tester , we were gearing up & then .....

Here's a pretty good tube on one , these folks have a couple of the l'll buggers .

Ebay has a couple but their pretty darn proud of them .

this ones pretty good , Lost Creek Machine had one a ways back they may still ?

animal

On 7/1/24 8:53 PM, Jon Rus via groups.io wrote:

Mike,?

.

I have never seen one of these and this unit clearly has a label identifying its'-self.

Is this your actual lathe or similar to yours?

What does the motor do? Help with balancing? Missing a chuck that has a cutter to clear the grooves between the armature contacts?

Does it have a main drive motor?

.

Nice history lesson.

On 7/1/2024 11:44 PM, mike allen wrote:

I picked up a armature lathe many years back at a yard sale . I asked the guy how much for te armature lathe & he said " is that what that is " . He gave it to me cause I was the only guy out of 50-75 people that knew what it was . Have used it a fair amount over the years .

.?

If ya ever see one of these at a yard sale & ya can get it cheap their on the handy side .

I've always used scotch pads instead of sand paper over teh years , their a bit cleaner then sand paper . Here's some scotch pad info that some of ya may find interesting

SCOTCH-BRITE GRIT CHART
3M Scotch Brite Nylon Pads:
7445 - White pad, called Light Duty Cleansing - (1000) 1200-1500 grit
7448 - Light Grey, called Ultra Fine Hand - (600-800) 800 grit.
6448 - Green (?), called Light Duty Hand Pad - (600) 600 grit
7447 - Maroon pad, called General Purpose Hand - (320-400) 320 grit
6444 - Brown pad, called Extra Duty Hand - (280-320) 240 grit
7446 - Dark Grey pad, called Blending Pad (180-220) 150 grit
7440 - Tan pad, called Heavy Duty Hand Pad - (120-150) 60(?)
Green Scotch Brite is available EVERYWHERE. It's 600 grit.
Blue Scotch-Brite is considered to be about 1000 grit.
(The value inside the parentheses is directly from 3M.)
3M Chart
Less Aggressive --------> More Aggressive
7445 7448 6448 7447 6444 7446 7440
Finer Finish --------> Coarser Finish

animal

On 7/1/24 7:33 PM, Tony Smith wrote:

You don’t need to turn it, you just need to clean it.

?

By turn I meant put it in the chuck and spin it by hand, holding? the sandpaper in the other.

?

Here’s some good pictures showing the general idea: , obviously a smaller motor than what you’ve got.

?

“kinda rough” is an understatement.? Basically that carbon can build up between the copper rails and cause a short, might be your problem.? But yeah, shiny & smooth is good.? Once you get all the black gunk off you be able to see if there any further damage that you’ll need a lathe to fix, things like gouges & pitting.

?

What do you mean by belt?

?

Tony

?

?

?

From: [email protected] <[email protected]> On Behalf Of Ralph Hulslander via groups.io
Sent: Tuesday, 2 July 2024 12:10 PM
To: [email protected]
Subject: Re: [7x12MiniLathe] how to.inspect.motor?

?

My other lathe is not running so I cannot turn the commutator.
That commutator does look kinda rough.

What is the belt?



Ralph