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  #11  
Old 03-13-2019, 04:31 PM
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I think a 18x24 would suit me just fine. Then I could blue and scrape the saddle and cross slide on the $100 Monarch when the time comes.
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  #12  
Old 03-13-2019, 06:37 PM
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You would shit at the scrap pieces of granite that the shop I work at throw out. I should check some of them to see how straight they really are?


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  #13  
Old 03-14-2019, 03:22 AM
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The only way I seen the certifiers do it was a dial indicator that slid on a long rod type mount .
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  #14  
Old 03-14-2019, 05:22 AM
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If you have a local wood crafter's, hobby/craft store near you they sell them.
other craft stores sell them too. all run about 80 to 100 bucks, last I checked.
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  #15  
Old 03-14-2019, 08:50 AM
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I had a granite slab (about 6” thick) given to me years ago. It was about 12x18”, polished on one side. It was a ‘mass’ for a precision lab scale to sit on.

The company I worked for then had several CMM’s, so I asked to bring it in and check flatness. It varied almost .005” in total across the face. So unless it is lapped for flatness I’d be surprised at regular polished stone being very flat.

Tim, are you asking because you found a deal on one, or out of curiousity?

For your needs, ANY granite surface plate, new or used, would suffice. Pick a size that you think will work for what you need.


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  #16  
Old 03-14-2019, 09:05 AM
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Quote:
Originally Posted by greywynd View Post
I had a granite slab (about 6” thick) given to me years ago. It was about 12x18”, polished on one side. It was a ‘mass’ for a precision lab scale to sit on.

The company I worked for then had several CMM’s, so I asked to bring it in and check flatness. It varied almost .005” in total across the face. So unless it is lapped for flatness I’d be surprised at regular polished stone being very flat.

Tim, are you asking because you found a deal on one, or out of curiousity?

For your needs, ANY granite surface plate, new or used, would suffice. Pick a size that you think will work for what you need.


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I use a piece of cut out counter top granite. for hand resurfacing work on hydraulic valves, small engine heads... for tractors and small engine work, it's not precision by any means but is flat enough to do what I need and was free.
I use the sticky 18" round sanding disk. stick it to it and so far, has served me well. but, I don't think it would work... for machining purpose.
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  #17  
Old 03-14-2019, 09:26 AM
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Quote:
Originally Posted by MetalWolf View Post
I use a piece of cut out counter top granite. for hand resurfacing work on hydraulic valves, small engine heads... for tractors and small engine work, it's not precision by any means but is flat enough to do what I need and was free.

I use the sticky 18" round sanding disk. stick it to it and so far, has served me well. but, I don't think it would work... for machining purpose.


I’ve seen a piece of tempered glass used for stuff like that too. Or a ground steel plate.

I also have a cast aluminum base from a quality control inspection fixture here, I can use it for some of that sort of stuff. It’s about 2’ x 4’ so it also makes a nice welding table at times.


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  #18  
Old 03-14-2019, 01:00 PM
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I got a couple small ones from Grizzly back when they were cheap. Maybe even free shipping. 9" x 12" and 12" x 18". Then I found a 24" x 36" x 5" Do-All plate locally for $50 IIRC. Must weigh over 400 pounds.
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  #19  
Old 03-14-2019, 09:45 PM
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I watched a video from OxTool aka Tom Lipton about when he had a granite plate resurfaced and certified.

I think this is the link for it. https://youtu.be/EWqThb9Z1jk


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  #20  
Old 03-15-2019, 02:19 PM
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Quote:
Originally Posted by greywynd View Post
I had a granite slab (about 6” thick) given to me years ago. It was about 12x18”, polished on one side. It was a ‘mass’ for a precision lab scale to sit on.

The company I worked for then had several CMM’s, so I asked to bring it in and check flatness. It varied almost .005” in total across the face. So unless it is lapped for flatness I’d be surprised at regular polished stone being very flat.

Tim, are you asking because you found a deal on one, or out of curiousity?

For your needs, ANY granite surface plate, new or used, would suffice. Pick a size that you think will work for what you need.


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I'm asking out of curiosity. I do however know of one that might be available but....






It's 7000 lbs
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