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| fly cutter |
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| wongster:
David, Appreciate that. Regards, Wong |
| wongster:
Bill, hope you don't mind if I use your thread to ask my question on the tool I grind. Spent quite some time in my shop today to attempt to grind the tool with the big radius on 1/4" square HSS for flycutting. This is what I get: View from top. From the end. From the radius. The result is rather crude and doesn't seem to work well as the part of the radius that came in contact with the work piece was very near the shank of the tool. I'll study the photos again to see what went wrong with my grinding. Don't know if its because of the angle of the flycutter body holding the tool being too shallow. One thing I did learn today which I'm rather happy about; I got a good feel for free hand grinding. Took the opportunity to "repair" those damaged HSS bit I kept and did some test cut. Not too bad. Anyone have pics of this type of tool touching the stock? Want to see which part of the radius should be doing the cutting. Regards, Wong |
| fatal-exception:
Front the front of the tool, try to make the radius as smooth as possible for the best surface finish. You will want to do the final honing with a diamond or some other stone. Only the leading edge of the tool cuts, so it doesn't matter about the part of the edge closest to the shank, unless your tram is that far out.... What you have ground there looks fine to me. If your not happy with it, keep trying till you get it right. Remember, it doesn't matter what it looks like, it matters how it cuts. As long as you have adequate relief on the front and bottom, it should cut fine. (sorry iPhone in dark shop...) |
| wongster:
Thanks for the tip. Wow, yours seem to be a rather deep cut. I'm only doing max of 0.25mm per pass, as recommended by Sherline. But I'm usually on around 0.15mm to 0.2mm. Regards, Wong |
| Bernd:
--- Quote from: wongster on August 23, 2010, 06:56:28 PM ---Wow, yours seem to be a rather deep cut. I'm only doing max of 0.25mm per pass, as recommended by Sherline. But I'm usually on around 0.15mm to 0.2mm. --- End quote --- That all depends on the size of your machine and rigidity of the spindle. If you have a Sherline then go by their recomendation until you get used to how deep a cut it will acutally do. Bernd |
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