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Granite Surface Plates

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Granite Surface Plates

#1

Granite Surface Plates

tony r

>I just received a lapping plate from the Japan Woodworker for flattening my water stones. This thing is only 10 inches or so long and is a bit more than 1/16 concave from one end to the other. (obviously i'm sending it back but i find this astounding that they would sell this product). I also have a piece of float glass i purchased from garrett wade and it too would appear to be out of flat (though in this case its not as bad and could be my starrett ruler which i did purchase second hand on e-bay). In any case, this has all led me to the conclusion that the only way i will ever truly know what is flat and what isn't is to purchase a 12x18 granite surface plate which i can then use to lap my rulers and anything else i need to make flat. Does anyone have any thoughts on what grade surface plate i should purchase for these purposes? Is B enough or should I go for an A? And any suggestions on where to pick one of these up (relatively) inexpensively would be much appreciated. and does anyone have any experience with the grizzly granite lapping plates? they are grade B's and appear to be pretty well priced. thanks much, tony.

Re: Granite Surface Plates

#2

Re: Granite Surface Plates

Ray Thompson - Middletown,IN

>Go for the lowest grade, its far more accurate than anything in woodworking.

Ray

Re: Granite Surface Plates

#3

Re: Granite Surface Plates

ThomD

>I think they have had a lot of trouble with those ceramic plates. They were in the catalogue, then out. Now I see they havea cheap one, and one about 70 bucks. Every ceramic sharpener I have had has been bent like a banana, and while they can be flatened, it isn't fun.

I have a granite plate, that I use for sharpening, I think I bought it from Lee Valley. Weighs a ton, and I don't use it that much. I used the Shapton flatening system for about a week, and it seemed fine. For the actual flatening of stones, i just use plate glass, and sandpaper, or the granite block with sandpaper.

Over the years I have just tried to keep it simple, and not get too caught up in hyper accuracy several steps away from the actual project. When I use my water stones I generally rub them together for flatness. Though mostly I use the scary sharp system. I have dozes of stones, but the sandpaper is so agressive, it is hard to put down.

Sorry I don't know anything about grades.

Re: Granite Surface Plates

#4

Re: Granite Surface Plates *LINK*

John Meikrantz

>Norton has a new waterstone flattening stone, that I just saw at toolsforworkingwood. I have used a Norton Crystolon stone in the past for flattening. Looks like they took that idea and made a better flattening stone. The price is right, anyway!


Norton flattening stone

Re: Granite Surface Plates

#5

Jack Guzman from Maine

Re: Granite Surface Plates

Jack Guzman from Maine

>Woodcraft has a granite slab that is flat enough and pretty cheap.---Jack

Re: Granite Surface Plates

#6

Re: Granite Surface Plates *LINK*

Rick Hoppe (Los Angeles)

>Tony, I got my granite plate from Grizzly. They are "B" plates and come with a calibration cirtificate guaranteeing flatness to within .0001 in. That's ONE TENTHOUSANDTHS of an inch! I got the 2"x 9"x 12". Works great for my purposes and cost $19.99. Here's the link:


Grizzly Granite Surface Plates

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#7

Enco source for *LINK*

Jim Bodin in CR

>granite surface plates. Do a search for surface plate. 9x12 grade B is about $15.00.


http://www.use-enco.com/CGI/INSRHM

Re: Granite Surface Plates

#8

Re: Granite Surface Plates

William Duffield, on the Cohansey

>Do not put the abrasive directly on the surface plate and rub the waterstone on it, or you will quickly ruin it's flatness. You can use the plate as a substrate for paper backed abrasive (sandpaper), which you can either glue in place (with 3M 77 spray adhesive, for example), or with the surface tension of water (assuming you are using wet/dry paper). Religiously, keep the abrasive particles off the flat granite surface if you want it to stay flat enough for other machining purposes. The grade B stone is more than flat enough for any woodworking tools. If I understand the process, the grade A surface plate is only used for calibrating and checking the flatness of grade B surface plates.

Re: Granite Surface Plates

#9

But the shipping...

Steve A

>The one problem with getting the wonderfully inexpensive plates from places like Enco or MSC is the shipping... try to catch them when the free shipping special is on... The plate I got from Enco shippng (12x18) was more than the plate. With that in mind, I grabbed one of the 9x12s when I saw it at Woodcraft.

Steve

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#10

Re: Granite Surface Plates

Victor Parisian

>Considering all the above, I'm going to take a closer look at that cemetery I pass every day.

I think it might work... Drive up in a somber manner; pick out a likely candidate; kneel in front of the slab; take my tools and lapping compound out (it helps to carry them in a vase along with the fake flowers)then do the lapping. When done replace the tools in the now empty vase, dab your eyes a bit with a handkerchief then drive away very somber like. No worry about lifting the heavy granite plate, no shipping charges etc. ;>)

Victor - conquering one small problem at a time.

Oh Ya almost forgot, got to stop somewhere and steal some more fake flowers...

Re: Granite Surface Plates

#11

Reminds me of a story

Ray Thompson - Middletown,IN

>When junior was a teenager he was prone to forget things like birthdays and mother's day, etc. So one mother's day he presented his mother with a bouquet of cut flowers that were just beginning to wilt. She asked him what cemetary he got them from and he proply replied "Anderson Memorial". She still reminds him every mother's day. I'm just glad I'm not in his shoes, kinda helps take the pressure off me.

Ray

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#12

Free shipping at Enco

Don Thompson - Cutler Ridge, Florida

>The latest Enco flyer lists free UPS shipping on orders over $50 and under 125 pounds.

A 12x18x3 Toolroom Grade B No Ledge granite plate is $24.95. I guess if one can find something needed for $25.05, this is a good deal.

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