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Re: this is pretty cool


 

standing corrected(S)

In a message dated 12/11/2023 7:08:56 AM Pacific Standard Time, ckinzer@... writes:
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Just a minor correction in case anyone wants to look for it.? It is "Leadloy", not "Leadolly."? More officially, the alloy is 12L14.
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It is a very free machining steel alloy (as in "try it, you'll like it") and used in making a lot of automatic screw machine parts.? I don't know if that is still true today as something else might be being used now.? I didn't research that aspect.
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Yes, it contains lead.? You should do your own homework, but it has been my understanding that for regular machining there is no particular hazard.? For welding, I think there is risk.? And probably also for grinding.? I look at this like the risk of beryllium.? It is very hazardous by itself but alloyed with copper (beryllium-copper) normal machining is safe and many hand tools are even made of it since it won't produce sparks.? Good for use around things like thermite or explosives.
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Charles E. "Chuck" Kinzer
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On Monday, December 11, 2023 at 04:38:49 AM PST, Charles Devore via groups.io <claremont5@...> wrote:
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Burnishing has it's place, doesn't remove material, but looks nice, we always used fluid, I suspect that material is "free machining" type and since it is asia is most likely "leadolly"(no longer used much here=epa), if a really nice bearing surface is needed, just rough it around .004 oversize and then run the parts thru a centerless grinder "plunge cutting each one it goes pretty quick

In a message dated 12/10/2023 11:11:14 PM Pacific Standard Time, d.i.williams@... writes:
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Dear Mr Animal,

May I ask some related questions for the group to ponder?

Firstly, ¡ª Thank you very much (Mr Animal) for posting this? - I found it very interesting and the style of the video was both very sharp & polished. (Pun intended)
(I looked at the chuck and thought - this looks like a rather large chuck on a 7 x X lathe?.)

1. Seriously, is this an industry standard practice for polishing metals in a lathe?

2. A tongue in cheek question¡­¡­ As a matter of interest, if you had a similar large tool held in a milling machine and run using very close passes over the surface, would it (sort of) polish a flat piece of work? I realise it would not have quite the same effect as the work is not spinning. But the tool is. (Unless it was on a rotary table and you were turning it very very fast.?) Perhaps run in two passes at 90deg. to each other. Producing a sort of diamond effect? Does anyone have any knowledge?

3. Would you get a sort of similar(?) effect using a small(?) spherical shaped ball bearing held in a holder on a (mini) lathe?

Thank you all, in anticipation.

All in all, very interesting. Thank you. Just the harden steel ball doing the polishing.

David UK.
> On 11 Dec 2023, at 04:31, mike allen <animal@...> wrote:
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> Watched this a few nites back , pretty cool
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> animal
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