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Post by bootes on Jan 23, 2023 12:12:25 GMT
Hello everyone, I am recently new to Woodturning though I am a carpenter, having worked for the NHS until retirement. I recently purchased the Sovereign set SOV-RSTMDBS. On inspection of the cutters they seem very badly ground around the edges, the top and bottom faces are very smooth, but as I see it this would create a saw tooth cutting edge that is very blunt and not very easy to use. Even though I am using very light pressure I still get catches, one so bad that while hollowing out a maple bowl it was ripped from the chuck breaking the spigot. I had turned the outside with conventional tools, now that blank is a complete right off. Can anyone tell me if the HSS cutters should have been of better grind quality or are we left to re-grind a new product. I feel it might have been helpful if the Tip holder RSTM-TH had been included in the set.
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Post by Clive Brooks on Jan 24, 2023 9:12:28 GMT
Hi Bootes...Welcome to the world of woodturning...The cutters on the TurnMaster that you have purchased are ground with a 10 degree relief to allow the tool to been used horizontally without the need for the you to have to concentrate on bevel angles etc..If you are getting catches using the tool, it could be that you have an extended overhang from the tool rest to the area you are working on your bowl whilst trying to take a large cut
Please contact Robert Sorby direct by email and we will be able to assist you, so that you can enjoy this wonderful tool and your newly found hobby
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Post by bootes on Jan 24, 2023 13:08:03 GMT
Clive
Thank you for your reply but my problem is with the quality of the grind more than angles, I would have expected more of a mirror shine as I would have on my carpentry chisels, thus creating a razor sharp cutting edge.
As for the overhang, if I my quote Jeff Farris from the “Turning with the Turnmaster” thread;
“Not sure what you modified, but I assure you, the overhang of the tool is absolutely, positively not the cause of your catches. It simply doesn't matter. The tool is designed to do deep hollowing of small diameter bowls and narrow opening vessels...you'll be hanging far off the tool rest by the time you get to the bottom of those style projects, no matter what. So the small amount of overhang you have at the beginning of the project certainly isn't going to matter.
Your bubble level isn't necessary. Perhaps I overstated the need to be level. Level to slightly trailing...don't overthink that part of it.
Without standing at your side, I can't absolutely diagnose the problem, but I've got a pretty good guess, having been at the side of quite a few guys in the same situation. Using a scraper -- any scraper, not just a TurnMaster -- is quite different to hollowing with a bowl gouge. If you're a fair hand with a bowl gouge, or have watched a buddy that is, you're used to taking a rather healthy cut per pass. If you try to do that with a scraper, a catch is inevitable. The key to quickly removing stock with a scraper is to take a whisker of a cut, work across the piece fairly quickly, and cut in both directions. Pretty soon, you'll develop a rhythm for the cut and a feel for how deep to work and catches will be a very rare occurrence.
What typically happens is that the turner will get a catch, and in determination to control the tool, holds on tighter and scrunches up his shoulders. Now we're headed down a dead end alley. It isn't a matter of man-handling the tool, it's a matter of dancing with it.
One of my turning mentors suggested to me years ago to practice taking as little as possible off the work-piece. This is spot-on perfect advise for learning to cut efficiently with the TurnMaster. If you get a feel for taking the slightest whisker off the piece, you'll be well on your way to cutting quickly. Less is more.”
I followed this information and was actually approximately 5mm from the edge of the shallow bowl when the catch occurred. I believe the bad catches are more due to bad grind than my technique as followed above. I’ll email direct to see if they can help
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