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I think this is the best thing I've ever used for lapping.
I did an experiment and tested my dumpster-find piece of granite and went and lapped again on the Starret slab and didn't find much of a noticeable difference. All of the pencil marks went away very quickly as if it was flat with only a couple of tiny marks on the two ends that disappeared with the next quick lap.
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What do you put on the plate.
A good flat granite block can be expensive.
While it is probably as accurate as can be had I still like my GDLP or DMTC in the kitchen sink with water trickling down to take away the swarf. Flat enough for government work. :)
You can get one from Woodcraft for less than $40 delivered.Quote:
Originally Posted by niftyshaving
They are quite proud of these you are right. I could not afford one, I have access to it in my building. I just lay sandpaper down, wet it, and lap away.Quote:
Originally Posted by niftyshaving
You're right JimmyHAD! I usually use a granite piece that I found at the back of a granite cutting place. I did an experiment and tested the dumpster piece and went and lapped again on the Starret slab and didn't find much of a noticeable difference. All of the pencil marks went away very quickly as if it was flat with only a couple of tiny marks on the two ends that disappeared with the next quick lap.Quote:
Originally Posted by JimmyHAD
It is way overboard to use this. Just a little test to calibrate my own granite slab.
Check this outQuote:
Originally Posted by niftyshaving
comes with certificate for flatness, it has micron precision.
If I'm spending $32 + shipping for that block of granite and going thru substrates, don't I approach the cost of a DMT quick enough?
Used to lap waterstones on my mother's granite kitchen countertop with some wet/dry sandpaper but been switched to the DMT for years now...
Is the typical high-q slab actually flatter?