For sure, Milt, I would prep the wood if working on a fine piece. As Tim pointed out, I'm working on scrap to test the principle of pushing the REVO to this extent.
This bit is as sharp as I know how to make one. It's a 60° cutter reground to an infinite point, then a relief grind behind the flat cutting surface sneaking up on the cutting edge of the flat. Then two strokes on a fine Arkansas stone at an angle to relieve the tip. Once that's done, the now off center cutting tip "wobbles" about 0.0001" so it doesn't just drag along. I learned to do this working in the tool and die department at Jostens where extremely fine detail was cut into the die blocks before they were hardened. It's not a sheer down cut which would minimize the fuzzing, but that wasn't a problem in metal! The hand checkering tools finish out the cut at 90°, so the diamonds are low and sharp. A 90° might do well enough in a prepared surface that touch up wouldn't be required. I set the depth using feeler gauge strips under the depth stop, but it's real hard to tell when that sharp a point is at the surface. Yes, I probably was cutting too deeply, at least in places. I found backlash in the driving spur, so that didn't help. Preparing an oak blank for 72 divisions of 18 LPI. DanK On Tuesday, October 17, 2023 at 12:28:59 AM UTC-4 bulk...@mmnet.com.au wrote: > Perhaps try cutting not so deep also soaking the wood in oil for a few > hours before cutting can greatly reduce chipping and tearing I do that > > For some wood threads > > > > Bill > > > > > > *From:* legacy-orna...@googlegroups.com <legacy-orna...@googlegroups.com> *On > Behalf Of *cdkr...@gmail.com > *Sent:* Tuesday, October 17, 2023 9:15 AM > *To:* Legacy Ornamental Mills <legacy-orna...@googlegroups.com> > *Subject:* Re: checkering videos > > > > Made tiny tiny chips today. Really bad choice of wood. Didn't think it > would > > crumble like it has. My other blanks are scrap oak pieces, and they might > be > > as bad. I'm going to adjust to a verified common checkering pattern of 18 > LPI > > selected from the range of available checkering patterns and tools that > run > > from 16 -32 LPI. And reduce the number of starts to 72 which gets me in > the > > same ballpark of work diameter, which my target is about 1 1/4" give or > take. > > This intersection piece should clean up pretty well. It's just real fuzzy. > > > > The blue circled area is what I worked on for cleaning up. It goes fast > and > > the ridges are crisp in that area. > > > > Lessons: 1. A progress chart of hole positions is crucial to success. 2. > And I am > > pushing the limits of the REVO rigidity because you can see every little > > inconsistency produced by tiny flexing in Z axis. 3. Choose better wood. > Machine > > cutting is different than hand cutting from scratch. But this, as tedious > as it is, is still > > much faster to get accurate layout, me thinks. > > > > I also restricted the data input for checkering lines per inch to what is > available for > > touch up tools. It seemed like a good idea at the time. > > > > Time to think of Christmas trinkets..... > > DanK > > On Sunday, October 15, 2023 at 10:43:05 PM UTC-4 Tim Ziegler wrote: > > Thanks Dan > > > Kind Regards, > > > > Timothy J. Ziegler > > Ziegler WoodWork & Specialty > > Ziegler Laser Worx LLC > > 14171 160th Ave. > > Foreston MN 56330 > > > > 320-294-5798 <(320)%20294-5798> shop > > 320-630-2243 <(320)%20630-2243> cell > > > > > > On Sun, Oct 15, 2023 at 8:55 PM cdkr...@gmail.com <cdkr...@gmail.com> > wrote: > > The next video shows how I move the vernier arm after exhausting the span > it offers. 80 starts is a > > good example to use because it requires the half degree resolution of the > vernier. So I have done > > the first nine passes as this picture shows. No touchup on osage orange. > Not the best choice. > > It looks rougher than it really is because the fuzz makes the cuts > > look irregular. It is a bit due to flexing in the machine, but should > clean up nicely with checkering > > tools. Which reminds me. My checkering tools are 18 lines per inch...so > don't ask my why I chose > > 21 lines for this sample! It's because.....well, you know..... > > Now to move the vernier > <https://drive.google.com/file/d/1D13KWyNWbvLy_1e8H-gr0LHaE-GJCZZW/view?usp=sharing> > > to the next step. > > DanK > > > > On Sunday, October 15, 2023 at 9:45:41 PM UTC-4 cdkr...@gmail.com wrote: > > The first video is showing how I adjust the vernier positioning chart for > the 80 starts I'm using on the > > sample checkering. I suggest doing a print preview. "File>Print Preview" > and it will > > show you what to expect. You can print it from the preview or go back to > "File>Print" from > > the main menu. > > Here is the first video > <https://drive.google.com/file/d/15C2zrueB6u3XI3ax3em1S5PiSfyHjoVi/view?usp=sharing> > > which will be available in a little bit until I take it down for the space. > > > > DanK > > On Sunday, October 15, 2023 at 9:37:56 PM UTC-4 cdkr...@gmail.com wrote: > > I finally got the dynamic vernier index positioning chart workable. I > can't be sure of error free yet, but it works accurately for 80 starts. > > > > It took me awhile to stretch my head around the expanded vernier operation > on these high counts. It turns out that one has to go around the index > several times in some cases. I had assumed it would be just once, like the > simple indexes, and that was a stumbling block. Because the vernier has to > be moved once the moves exhaust it's span, that creates a gap in the > machining of the workpiece. Not to worry, it finishes those gaps on the > next go arounds. > > > > I am debating about putting the three video clips together, but I think it > does better separately. This is not a video friendly site, so I'll put them > on my Google drive for a bit and post the links. This is how I will link > the description to help understand it's corresponding video. Not a pro > photographer, but I hope it explains the basics well enough. > > > > I'm attaching the now versioned Legacy Pitch Chart V10.1 which has the > dynamic vernier positioning chart. It is set up with print ranges already, > so once you select the number of divisions to cut, the chart will adjust > and you just print it. It made it possible for me to keep track of what > move I just did and what the next one is supposed to be. Again, no > guarantees if you use other than Libre Office Calc. > > DanK > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Legacy Ornamental Mills" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to legacy-ornamental...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/legacy-ornamental-mills/cca9b5ae-fd00-4f3a-8582-98dce7be9427n%40googlegroups.com > > <https://groups.google.com/d/msgid/legacy-ornamental-mills/cca9b5ae-fd00-4f3a-8582-98dce7be9427n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "Legacy Ornamental Mills" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to legacy-ornamental...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/legacy-ornamental-mills/b12acd2e-b011-4ee0-9595-b727e1152e93n%40googlegroups.com > > <https://groups.google.com/d/msgid/legacy-ornamental-mills/b12acd2e-b011-4ee0-9595-b727e1152e93n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Legacy Ornamental Mills" group. 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