How does a 12x18 granite surface plate for ~$25 sound!!! - Router Forums
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post #1 of 22 (permalink) Old 03-28-2010, 11:21 PM Thread Starter
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Default How does a 12x18 granite surface plate for ~$25 sound!!!

Hi all,

Stumbled on this somewhere tonight:

Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies
use promotion code: PFSMAR

This is the one I got for $24.95:
Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies

Hard to believe, but it's 70lbs, and FREE SHIPPING for who knows how long. Minimum order size is $25 for the free shipping, so I added a pint bottle of "surface plate cleaner" for like $3. This is alot better than a sheet of thick glass for scary sharp sharpening... can't wait till it arrives...
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post #2 of 22 (permalink) Old 03-28-2010, 11:49 PM
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I'm a total newbie, but what are they used for and what is their usual price range?
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post #3 of 22 (permalink) Old 03-29-2010, 01:24 AM
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Quote:
Originally Posted by anotherBob View Post
Hi all,

Stumbled on this somewhere tonight:

Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies
use promotion code: PFSMAR

This is the one I got for $24.95:
Enco - Guaranteed Lowest Prices on Machinery, Tools and Shop Supplies

Hard to believe, but it's 70lbs, and FREE SHIPPING for who knows how long. Minimum order size is $25 for the free shipping, so I added a pint bottle of "surface plate cleaner" for like $3. This is alot better than a sheet of thick glass for scary sharp sharpening... can't wait till it arrives...
Well if the stats on the plate are correct and you can get it to your door at that price I say go for it'.
But I have seen some of the imported plates be out as much as 5 thou on 24" and that like way far to much.

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post #4 of 22 (permalink) Old 03-29-2010, 07:55 AM
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Looks like they have an over stock of grade B, When I was in the trade we couldn't use grade B, .0002 would be out too far. A couple of tenths here and a couple of tenths there can cause a lot of PITA when ya go to assemble a 20 or 30 cavity injection blow mold; all them tenths add up.

I have a pink rock 24 x 24 two ledge 4" thick accurate to .00003. Or at least it was since I'm not in that trade any more I don't have to get it certified every year; my guess is it's still close though I take good care of it; it stays covered all the time unless some one ask what it is.

Makes a good conversation peice now, every once in a while I use it but not that much any more.

Good buy though.
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post #5 of 22 (permalink) Old 03-29-2010, 08:16 AM
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Not sure what good it would be in a wood shop, unless you use it for sharpening. Grade B is about hobby grade though. Your table saw top is probably all you need.
When I repaired precision tools, I used a AA lab grade. Overkill for a hobby shop.

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post #6 of 22 (permalink) Old 03-29-2010, 09:04 AM
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I hate to dampen your enthusiasm Bob, but the price tells it all. Save your money, for similar "accuracy" go to a glaziers and ask them to cut you a piece of plate glass from a damaged shop window, I did just that many years ago and still have it albeit rather scratched after so many years of work. I use it with a height gauge also for flat sanding by placing a full sheet of sand paper on it.

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post #7 of 22 (permalink) Old 03-29-2010, 11:34 AM Thread Starter
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Originally Posted by r32 View Post
I'm a total newbie, but what are they used for and what is their usual price range?
Hi r32,

I'll start at the end and work my way back ok...

Check out the video here.

The following answer is a quote from the plane maker on the web when asked how the plane was honed:

Quote:
"Actually I do know the specifics of the sharpening procedure. Jameel and I are always trying new sharpening methods and recently we've come upon a method that certainly helps in creating these kind of results.

The initial grind angle is 25 degrees either hollow or straight doesn't really matter. The iron is then jigged to create a slightly higher angle when creating the primary bevel on 15u psa backed 3m micro abrasive film, the burr is wiped off on a piece of 5u film and then the honing jig is tweaked to increase the honing angle by one degree thus creating a micro bevel on the bevel side with the 5u film and any burr created at this stage is once again wiped off the back on a piece of the 5u film. Then the jig is tweaked to create an additional 1 degree steeper micro bevel that is created on either 1u or .3u film. The iron is worked bevel and back with the finer film and then is not just SCARY sharp it is FRIGHTFULLY sharp.

The idea when using this micro abrasive film is that the finer films don't have the ability to remove a lot of metal across a bigger primary or secondary bevel, but they do an excellent job of polishing a small micro bevel to an extremely fine edge.

You wouldn't want to look at the edge created with this method too long with the naked eye, your eye might start bleeding"
This is where I have purchased my 3M film in the past:

3M Micro Abrasive Film for Scary Sharpening - PSA
3M Micro Abrasive Film for Scary Sharpening - PSA at Tools for Working Wood

A couple articles on "Scary Sharp" found on the web... google will show you more though:

How to Hone a Chisel - Fine Woodworking Video

Getting an Edge with Waterstones, Oilstones, and Sandpaper
Different woodworkers use different sharpening methods
Getting an Edge with Waterstones, Oilstones, and Sandpaper

So, rewinding to the beginning... you use a surface plate to maintain a flat surface onto which sandpaper is mounted to grind/hone your chisels and plane irons and such. hth...

@Swallow, jd99, AxlMyk - ya, I wasn't expecting an AA slab at that price... If it's out a couple thou from the corners, it'll be fine for my purposes, it'll be out far less @ around 3" at any point when a honing jig is holding a plane iron or chisel. Ought to be flat enough...

@harrysin - good advice sir, but I already have a 1/2" thick x 4" x 30" glass plate. A fellow at the the local glass shop gave it to me for I think ~$2. Problem was... I managed to loose it till this last weekend... , now I'll have a good backup.
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post #8 of 22 (permalink) Old 03-29-2010, 12:02 PM
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I just went down to my local orange box and paid $2 for a 12 X 12 granite floor tile. For a hobby woodworker it works just fine.

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post #9 of 22 (permalink) Old 03-29-2010, 12:17 PM
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Work Sharp™ WS3000 Tool Sharpener and Accessories - Rockler Woodworking Tools

The wheels are 1/2" thick glass, once the blade is sharp you can see your reflection on the edge..now that's sharp...

I and a another member got it 18.oo bucks on a misprint sale...so to say it pays to read the posted items on the forum..

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post #10 of 22 (permalink) Old 03-29-2010, 03:44 PM
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Quote:
I and a another member got it 18.oo bucks on a misprint sale...so to say it pays to read the posted items on the forum..
Oh quit gloating BJ!

Yeah I love my mine-cost-way-more-then-BJ's worksharp! But I got mine as a gift for Xmas so I can't complain!

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