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Old 05-06-2007, 09:52 PM
okdirt okdirt is offline
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Default Granite Surface plate

I was in Tulsa the other day,picked up a surface plate to save the shipping. Now I have a question, will Prussian Blue stain or hurt it?

Elements of Machine Work describes the process of marking a flat surface for scraping with an Iron surface plate and "RED LEAD". So what is Red Lead? I was taught to use Prussian blue.
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Old 05-08-2007, 04:40 AM
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GWIZ GWIZ is offline
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Don't know.

The general purpose black surface plates that the morons used in the shop, went thru hell and I never seen a stain.
No not me.
Any damage that I seen was from dropping something on them, hi impact chipping.
I did use MEK to clean them at one time, that's strong stuff and no problems.

On the other hand maybe they changed the material, try your blue on one of the sides of the plate.

Did you get a pink plate ?
I just have this blue stuff in the picture, standard for machine shops.
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  #3  
Old 05-08-2007, 06:32 AM
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midmosandblasting midmosandblasting is offline
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Default Cleaning

When the guy comes in to certify the surface plate he will clean with methyl or ethyl alcohol .The way they resurface those things is neat. Diamond dust and straight piece of steel.
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Old 05-08-2007, 06:40 AM
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Granite is porous so it will stain. Just ask anyone who has stained a high dollar counter top.

Why would you get the prussian blue on the plate? When applied to metal it dries very quick. It doesn't rub off that easy.

Anyway. if you get it on surface it isn't going to affect its intended purpose.
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Old 05-08-2007, 04:17 PM
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Quote:
So what is Red Lead?
The best high pressure lubricant ever invented ... banned by the EPA only because it was toxic to human life The fancy name was Red Lead & Graphite in Mineral Oil (RLGMO).

A granite flat is not typically used as a scraping reference. Wide 'camelback' straight edges are used to determine contact. For a photo of one, click here.
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Old 05-08-2007, 04:47 PM
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Quote:
Originally Posted by precisionworks
The best high pressure lubricant ever invented ... banned by the EPA only because it was toxic to human life The fancy name was Red Lead & Graphite in Mineral Oil (RLGMO).

A granite flat is not typically used as a scraping reference. Wide 'camelback' straight edges are used to determine contact. For a photo of one, click here.

Barry, I remember white lead. Used to put it in the little reservoir on the tailstock. Does that make me older than red lead??
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Old 05-08-2007, 07:21 PM
okdirt okdirt is offline
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Well now, heven forbid if I should get cancer from something like that. Bet it wouldn't be bammed if it was taxed like smokes, hu

Anyway, thanks for the replies.Answers some questions I had that weren't explianed to well in the books. Need to get the plate mounted on one end of my steel bench and a wood cover made for it. My the projects never end.
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Old 05-08-2007, 09:35 PM
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Quote:
I remember white lead. Used to put it in the little reservoir on the tailstock.
Only the oldest of the old hands know the purpose of the reservoir ... which dates us both

Some companies made white lead, red lead, etc. (1845 print)

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Old 05-09-2007, 08:23 AM
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Quote:
Originally Posted by precisionworks
Only the oldest of the old hands know the purpose of the reservoir ... which dates us both

Some companies made white lead, red lead, etc. (1845 print)


Thanks Barry. Think I'll go back to bed..
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Old 05-10-2007, 07:10 AM
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Quote:
Originally Posted by moe1942
Why would you get the prussian blue on the plate? When applied to metal it dries very quick. It doesn't rub off that easy.
Moe are you talking about hard blue or soft blue? We call toolmakers die at work hard blue, it comes in a spray can and when dry is hard to wipe off used for layouts. The prussian blue we use is what we call soft blue one drop of the stuff on you and you will have it everywhere. We use it for contact checks on gearing it doesn't ever dry.
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