Are diamond hones in the standard varieties (say 250-1200) appropriate for touching up a carbide scraper blade? Can anyone offer up comments upon the success or failure of this method (as opposed to a diamond wheel)? Thanks in advance.
-ss
"ss" skrev i melding news: snipped-for-privacy@posting.google.com...
I have given my old carbide-tipped sawblades a touch-up with a small diamond file that cost the equvalent of 6 - 7 dollars. Gave them a new life, and saved me maybe 50 dollars, so far.
I also use diamond hones on my chisels made from HSS steel and the so called cold pressed steel. Diamonds are good news for all cutting tools, - and their owners.
The best thing about diamond hones is that they do not deform noticably with use, they are forever flat.
Bjarte
I've been using them for touching up carbide inserts on lathe tools. Works just fine.
Ted
despite what the others say, I would add some reservations.
If your grip is extremely steady or you make a jig to hold a fixed angle, you may get reasonable results. It is hard not to round off the edge when sharpening _any_ scraper blade.
I find I get much more control by using a 4" diamond cup wheel on a mandrel in the lathe with a bit of square bar with a 7 degree slope milled on 2" of the top face clamped in the tool holder.
The bit of bar is advanced until it is almost touching the cup wheel and the blade of the scraper is rested on it. The rear of the scraper is held (at the appropriate distance from the edge) loosely between the finger and thumb of the right hand, which is braced on the bed of the lathe to give the correct angle. The handle of the scraper is held higher than the blade so that the wheel cuts the top edge of the blade. The business end of the scraper is swept across the wheel to give the desired radiused edge with the correct angle on it.
I find that one or two smooth sweeps to each side of the blade with the wheel turning at 500rpm are sufficient to restore the blade from cutting a chattering washboard pattern, to smoothly slicing cast iron.
HTH Mark Rand RTFM
I agree, but for all cutting tools, not just scraper blades. It's very easy to round off any cutting edge when honing. Many a fine tool has been ruined by improper application of a honing stone, be it aluminum oxide or diamond.
Harold
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.