Gallery, Projects and General > How do I??
Quartz Surface Plate?
vtsteam:
I was thinking about that 400 mm long camleback, and I was imagining bolting three of them to a piece of bar or square tube to make a 1200 mm long straightedge. Set them on your granite surface plate at work (or wherever) and tighten the bolts so the camelbacks are all in line along the bottom.with the surface plate.
Then I was thinking, well heck you could do the same with (not camelbacks) but just short lengths of bar stock, bolted to a full length piece. As long as they were reasonably straight three of four hundred mm long pieces, and de-burred, it should work for your purposes.
Hey and if it ever warped or anything, you could just re-straighten it with the bolts on a surface plate again. An adjustable straightedge.
PekkaNF:
--- Quote from: Baron on August 30, 2015, 06:50:40 AM ---Hi Pekka,
I'm sure that someone else will have said it, but it might pay you to have a chat with your local funeral director or headstone mason. I've had a chat with one near me (UK) and he says that unpolished granite slabs 4" thick are relatively cheap. However they are also quite flat ! The high cost is down to the amount of time and effort involved in polishing them. He has machinery to do this although I've not seen it in action, mainly because it's always in use and inside a very large enclosure. The fine slit that comes off makes a good lapping paste :-) He also gets broken and damaged headstones when he has to replace one. Some of these get cut down for plinths and other things. So its worth investigating.
--- End quote ---
I checkked the local one and the machine was a little antique...and rock plates lookeed fine, but measured badly. One was better, but it is still marginal.
Pekka
jcs0001:
Pekka, Steve and others - thanks for the discussion about this. I was wondering how to check such items for flatness and you've provided some answers.
John.
BaronJ:
--- Quote from: PekkaNF on September 03, 2015, 02:29:33 PM ---Hi Pekka,
--- Quote ---I checkked the local one and the machine was a little antique...and rock plates lookeed fine, but measured badly. One was better, but it is still marginal.
Pekka
--- End quote ---
I haven't been down that way for a while, I'll have to call on him and talk to him some more. Not surprised that the machine your mason has is a little antique, I suspect that the machine that my local mason has is an antique as well. I'll have to persuade him to let me have a look at it and maybe photograph it. I'll let you know when I get chance.
--- End quote ---
PekkaNF:
Plate is pretty, but looks like as a whole it is not straight enough.
But I got three weird knife straightedges and one camelback. They sem to be pretty nice.
Pekka
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