Hello All,
Does anybody know of a shop in Bellingham, Seattle, Portland Area that can Lapp and certify granite inspection plates? I have an ok Grade B inspection plate from Grizzly that I would like to have re lapped to a Grade A or better, for use as a reference plate to scrape in machine tool surfaces and a couple of straightedges. Hoping to come up with a couple of leads where I could send this plate to be reworked.
Thanks
Glenn B.
Surface plate lapping
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Surface plate lapping
Moderator - Grand Scale Forum
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Re: Surface plate lapping
You might try asking calibration shops in your area where they get theirs done.
We found that by having several done at one time, the cost went down, so you might want to get some people together and do a group buy.
The guy who did mine says that he has a customer that buys chinese black granite plates for cheap and has him lap them to better standards.
Steve
We found that by having several done at one time, the cost went down, so you might want to get some people together and do a group buy.
The guy who did mine says that he has a customer that buys chinese black granite plates for cheap and has him lap them to better standards.
Steve
- Bill Shields
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Re: Surface plate lapping
The last plate that I had reconditioned was done by 'Rock of Ages'.
I know that Starrett also provides (or used to) that service.
In reality, you are most likely going to have to crate it up and ship it off. Places that provide this service are not as plentiful as car dealers.
I know that Starrett also provides (or used to) that service.
In reality, you are most likely going to have to crate it up and ship it off. Places that provide this service are not as plentiful as car dealers.
Too many things going on to bother listing them.
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- Joined: Mon Nov 10, 2014 1:39 pm
- Location: Woodinville, Washington
Re: Surface plate lapping
FYI, as follow up to Steve’s suggestions, I found two local metrology shops in the Seattle area, and got quotes for my grade B surface plate for around $200 for the initial set up and re calibration. Then $95/hour for lapping - if the plate was within specs. So elected to pass. I can buy a new Grade A plate for around $300 plus shipping, so can’t justify the expense for my limited needs.
Now a production shop with a larger reference surface, say 48x48x6, or larger, I could see spending the money. It would be very cost effective, as these larger plates seem to be running in the many thousands of bucks for the initial purchase price. But, my limited needs - not so much. .0004” high spots I can live with.
Glenn
Now a production shop with a larger reference surface, say 48x48x6, or larger, I could see spending the money. It would be very cost effective, as these larger plates seem to be running in the many thousands of bucks for the initial purchase price. But, my limited needs - not so much. .0004” high spots I can live with.
Glenn
Moderator - Grand Scale Forum
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Re: Surface plate lapping
See if they offer a "group" discount and get some friends together on it.
Mine only cost $40 for the 12x18 and $20 for the 9x12.
We had about five plates done at one time - one large one (like 24x36) and the rest 12x18 and under.
Steve
Mine only cost $40 for the 12x18 and $20 for the 9x12.
We had about five plates done at one time - one large one (like 24x36) and the rest 12x18 and under.
Steve