Ok so 1/6 pitch then is 6.024 threads per inch no gears on the legacy I know of cut a 1/6 of an inch pitch the .25 gears and the C gear cut a one inch pitch not 1/6 please enlighten me what am I not seeing? As far as I can tell you would need some serious math and work out what tooth drive gear needs to be cut to mill a 1/6 inch pitch
Bill From: legacy-ornamental-mills@googlegroups.com <legacy-ornamental-mills@googlegroups.com> On Behalf Of cdkr...@gmail.com Sent: Wednesday, September 6, 2023 8:18 AM To: Legacy Ornamental Mills <legacy-ornamental-mills@googlegroups.com> Subject: Re: Verification of understanding Bill, the wooden thread TPI used most commonly on 3/4" diameter stock is 6 TPI. The Woodcraft thread box I was trying to use produces a 60° thread profile at 6 TPI. So I want to cut 6 TPI with a V router bit on a 3/4" dowel. Some wooden threads were 60° and some were 90° degree profiles, depending upon use. 90° profiles are, of course, stronger and more often used on the huge screws of presses and vises. Either profile can be used on any pitch. I'm seeking a 1/6" (0.167") pitch, which shows up on the charts with a "C" driver gear (45 teeth) driving a "fine gear package" set against the "standard" 88 tooth index gear, all driven by the "standard" 4 TPI lead screw. Now, your math was correct, but not the understanding of what I'm headed for. "3/4 -6" is the same format thread designation as "1/4 -20" or "10 - 32". .ǝldɯɐxǝ ɹoɟ ᘔƐ - 0⇂ ,0ᘔ - ߈/⇂ ,9 - ߈/Ɛ ?dlǝɥ sᴉɥʇ plnoM LOL! DanK On Tuesday, September 5, 2023 at 5:46:20 PM UTC-4 bulk...@mmnet.com.au <mailto:bulk...@mmnet.com.au> wrote: So if I understand correctly is what your trying to cut a ¾ inch pitch thread with a V router bit ? a wooden v thread back in the day was usually a 90 degree V not 60 degree and the threads per inch would be 1.3 if I’m doing my math right. Bill From: legacy-orna...@googlegroups.com <mailto:legacy-orna...@googlegroups.com> <legacy-orna...@googlegroups.com <mailto:legacy-orna...@googlegroups.com> > On Behalf Of cdkr...@gmail.com <mailto:cdkr...@gmail.com> Sent: Wednesday, September 6, 2023 1:47 AM To: Legacy Ornamental Mills <legacy-orna...@googlegroups.com <mailto:legacy-orna...@googlegroups.com> > Subject: Verification of understanding Hi everyone, I've been studying all the related pitch information I can find and have accumulated this into a condensed spreadsheet workbook with four sheets for my use with the REVO. I struggled to understand how the various pitches were arrived at until I finally reduced it to basic specifications: number of teeth on the gears (sprockets) in the train. The posted charts make so many (reasonable) assumptions, that it was difficult to find the gear combinations to make an unlisted pitch. So I rebuilt the charts using formulas and can now instantly find the results using any pitch drive screw and any (standard) gear combination. Custom ones will be added as needed. Adding to the confusion was that different legacy machines used different combinations and not all are interchangeable. The charts were short on documentation what applied where. I was driven to do this because of a hand plane I'm restoring. It's a wooden one with fancy wooden threaded fence adjustment which was missing. I tried using my 3/4" thread box but the cutter was dull and after several hours fettling the thing, gave up because I could not make it cut clean threads in old cherry, no matter what tricks I tried, like soaking in oil, wax, and various other techniques. It was just too brittle. I want PERFECT threads and realized I have a PERFECT thread cutting machine...the REVO. I've used the metal lathe to cut threads in my urn, but why not make the REVO cut threads of all sizes and pitches? And while I'm at it, fine checker some stuff. Or quarter turn 30" ribbons. So guess what? A 3/4 - 6 is "standard" wood thread but the REVO did not come with 1/6" pitch capability. After reworking the sheets Bill and others have posted, I quickly narrowed the search to a "C" drive gear driving a "fine gear package" idler set against the standard index gear. See what I mean? I can't take that description to a laser cutter without being laughed out of the shop. So my sheet will tell me number of teeth on each gear in the train so if I need a custom one, I'll have the specs at hand. Now the problem is to find a "standard" solution, a "C" gear and the "fine gear package". Any hints? 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 <mailto:legacy-ornamental...@googlegroups.com> . 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