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Damaged Surface Plate

Discussion in 'PLACE CRAIGSLIST ADS HERE' started by ddickey, Apr 20, 2017 at 9:46 AM.

  1. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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  2. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    The damage to the plate probably does not change its accuracy. The bigger issue is perhaps value. Any used surface plate, without evidence of current calibration and careful usage, is about as valuable as any other rock in the woods. It is an unknown quantity. Furthermore, new import surface plates are not that much more expensive, aside from the shipping. Import plates are known for less than good quality control, so even a new one is subject to concern regarding accuracy. Some are very good, others are not, and we hobby machinists do not normally have the tools and skills to check them. So it is a gamble, and you never know if you have won or lost the bet. Getting someone to come and calibrate and certify a surface plate, or ship it for that work, is expensive. Buying a new USA made plate is also fairly expensive, including shipping. Bottom line and back to your original question: You could use the damaged plate for a lot of work, like general layout work, but you could never trust it to meet any standard. Using unknowns as reference surfaces is a fool's guessing game.
     
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  3. chips&more

    chips&more United States Active User Active Member

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    If I’m going to spend $50 bucks on a SP that size. It better be darn nice! And not with a big chunk/corner missing. It should be FREE! With that kind of a problem, I would be concerned about the reorganization of internal stresses and change in calibration.
     
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  4. woochucker

    woochucker United States Active Member Active Member

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    its worth about 10 - 20 not 50. Just my opinion.
     
  5. Rustrp

    Rustrp United States Active Member Active Member

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    I would look at the shipping costs, deduct this from the $50 they are asking and make an offer, or deduct the cost of the short road trip. Otherwise I wouldn't consider it. As Bob said; There's to many if's and unknowns, but if there's an itch that needs to be scratched, post a photo of what you bought instead of the plate. :D
     
  6. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    If there is a company near you that sells, calibrates, and certifies surface plates, then the costs of ending up with a nice one at a decent price might decrease dramatically. You would do the delivery and pickup, or they might come to you for a decent price. I have no idea what is available in Minn. You could buy a used one and get it calibrated or buy a used and calibrated one from the same people. That is worth looking into. Uglydog http://www.hobby-machinist.com/conversations/add?to=Uglydog on this forum lives in your area and may know what is possible there.
     
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  7. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Thanks guys. Think I shall pass on that one.
     
  8. brino

    brino Active User H-M Supporter-Premium

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  9. scwhite

    scwhite United States Active Member Active Member

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  10. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    I had to laugh cause there's people over here that try to sell chunks of misc granite as surface plates.
     
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  11. scwhite

    scwhite United States Active Member Active Member

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    If it is a Granite surface plate it would have some
    Kind of calabration tag on it . Grade A
    - or AA or AAA.
    On a tag with the company that makes it
    Like Starrett
     
  12. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    Well yes if it's US made or some other reputable company. Import ones don't, the "certificate" comes separate. I got a 12x18 grade A import with ledges from Enco years ago when they used to go on sale & that's how it came. Best $25 I ever spent & shipping was free!

    Oh I also have a MHC brand 9x12 grade B surface plate from MSC, came the same way.
     
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  13. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    If anyone is in the Los Angeles area, there's still a 24"x18" Standridge with ledges for $100 in Chatsworth. If I had the room I would have snatched it up when I first saw it.
     
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  14. scwhite

    scwhite United States Active Member Active Member

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    Mine is cast iron it has the manufacturers tag on it
    The grade is left blank . I doubt if it is very close
    Might be .001 - .002
     
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  15. scwhite

    scwhite United States Active Member Active Member

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    Your grade B should be pretty close
     
  16. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    There is also grade B which is typically used on the shop floor unless you are at an aerospace, semiconductor or other high end company. Grade B is good enough for most work. No certification and calibration to a standards bureau means that somebody is guessing or pencil whipping. If someone is not willing to stake his reputation on his work, then what do you think, or rather know, you have?
     
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  17. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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  18. scwhite

    scwhite United States Active Member Active Member

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    Yea I know the grade B is a lot closer that my cast iron
    My cast iron plate is not even graded .
    I expect it might be .001 which is not very close
    But it is cast iron & not Granite
     
  19. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    I have a 8x16" cast iron surface plate that I have scraped in. It is pretty accurate, and was spotted in to my AA tolerance, recently certified granite surface plate. If you have an accurate reference surface, it opens up lots more things you can do accurately and with confidence.
     
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  20. scwhite

    scwhite United States Active Member Active Member

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    I agree
    I got my cast iron free . I can't complain about that .
     
    Last edited: Apr 21, 2017 at 8:51 AM
  21. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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  22. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    The 9x12 grade B surface plate I bought a couple of months ago was $33 from MSC. They have 12x18 grade be for $66. Not sure how much shipping costs but if you have an enco merged account shipping is free over $50.
     
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  23. Charles Spencer

    Charles Spencer Active User H-M Supporter-Premium

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    At the shop where I worked in the 1970s we all had cast iron surface plates at our benches. There was one granite plate that could be used if needed. I don't recall ever needing it.

    Of course we also had a large Blanchard grinder with a dedicated operator. Periodically they would inspect the cast iron plates and regrind where necessary.

    Nowadays I have a pretty good Stanbridge plate. I keep it covered unless I need it. Most of the time I use a 6" piece of iron that I milled, faced, and lightly sanded. It is close enough and large enough for most layout work I do. It fits easily in my benchwork area and I just flip it over to protect the surface when not in use.
     
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  24. Herbert

    Herbert United States Iron Registered Member

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