Gallery, Projects and General > How do I??
Machining a flat face with good surface finish and accuracy
picclock:
@ chipenter
Many thanks for the pictures :beer:. That was exactly the sort of thing I had in mind. The machinability of the steel obviously plays a major part in the initial finish. Its quite amazing the quantity of dust kicked up by the process. What sort of depth of cut were you setting - 1-2 thou? It looks from your picture that you are using a grey wheel - Aluminium oxide ??
I thought I might experiment a bit and try a green grit wheel as these are sometimes used for getting a high quality finish on steel. I notice RDG do a range of cup wheels for about £12 delivered, though they don't give any info as to grit size. A CBN (cubic boron nitride ??) wheel can be had though I am not sure the extra price justifies it.
Best Regards
picclock
chipenter:
picclock a green wheel is too soft I have tried one and the wear on the stone is to mutch for acuracy , 1 thou cuts max any more and to mutch heat is gererated and the stone clogs and will need dressing , the stone is from RDG picked up at Ali pally show this is the finest grit wheel I have , the harder the steel the better the finish free cutting mild steel clogs the stone fairly quickly , I run at 2200 rpm the fastest my machine will go , the magnets are handy for collecting the steel dust as this can do nearly as mutch damage to the machine as the grit clean up took less than 5 minuets .
picclock:
Hi Chipenter
I think I will go for one of the RDG ones as your results seem very good. They appear to do a 100mm one for the same cost so I may get that one.
Quite honestly my knowledge of grinding as a process is minimal, limited to sharpening/making lathe tools out of HSS with the std bench type grinder, though I do have a diamond dressing stone/bar.
The reason I considered at the green stone (silicon carbide) comes from here :-
https://www.georgiagrindingwheel.com/grindingwheels_basics.htm#faq10
"One interesting characteristic of silicon carbides is the effect they have on steels. Due to the sharpness of these grits, one would think that they would be too aggressive and not provide a good finish. In fact, on steels, silicon carbide is used as a sort of polishing/finishing grit. It is used in tumbling processes as a surface finishing product."
Best Regards
picclock
mcostello:
If anyone wants to try and get a better finish from their surface grinder they should find Stan Zinkovsky's video from BarZ Industrial about putting jewlers rouge on a grinding wheel.
chipenter:
Don't fprget the thick paper or thin cardboard washers .
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