Emery, the rock, is aluminum oxide, and several kinds of iron oxides, plus other odds and ends. . Just looked it up. Corundum is the major ingredient, which is aluminum oxide. https://en.wikipedia.org/wiki/Emery_(rock) I remember reading about it being crushed and graded, decades ago, but that was about the time aluminum oxide as a synthetic became really common. IIRC, Corundum is ruby in it's purest natural form, and sapphire is the same thing with chromium instead of iron... Or maybe I misremember. I've been looking forward to synthetic aluminum oxide (more or less sapphire) that is colorless and transparent for use in space ships since I was a wee tot. Too much science fiction as a kid...
Bill in OKC
Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.
SEMPER GUMBY!
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.
On Tuesday, September 5, 2023 at 07:17:43 PM CDT, Dave Matticks <dpm100@comcast.net> wrote:
On 09/05/2023 12:04 PM CDT Bill in OKC too via groups.io <wmrmeyers=yahoo.com@groups.io> wrote:Emery is not the same at all!!
A lot of people say they take some "emery" to it!
Aluminum oxide and sometimes silicon carbide yes but don't think I've even touched a piece of "emery" cloth in decades!
Emery is s specific abrasive just like the others.
For what it's worth.
Dave
Thanks Jeff! First photo, last two digits 82 is the motor we've been talking about mostly. #83 is the other motor. They don't look too bad to me. ;) I'm also having a wiring or relay problem... I can hear the relay click. Nothing else happens. There are also a couple of limit switches in there, and a pair of momentary contact switches that are the Up & Down buttons. . Could be wiring, relay (which I have replaced because the original relay has a cracked open case) or switches. Could simply be corrosion, as this thing sat in an unconditioned shed for most of 20 years. I've got some wet or dry silicon carbide paper, and flint paper, not sure I have aluminum oxide paper... Emery is aluminum oxide. Do you know why it shouldn't be used? Too coarse?
Got plenty of X-Acto knife blades, And I'm sure I could find a broken hacksaw blade. I mostly don't throw stuff like that away! I do not own a growler. Currently, doesn't look like I can afford one that I know works, either. ;)
Funny thing, found a cheap ladies nail care file/buffer thing in drawer under my desktop. Think I'll be using that to polish the commutator. Just the couple of strokes I took with it made the segment I used it one nice and shiny!
Got to drop all that and get us ready for her doctor's appointment this afternoon. More later!
Bill in OKC
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