Hi Marcus, Here's the problem.
My Alibre CAD/Cam can produce a spiral slot in a disk using X and Y motion. If I tell it to use my 4th axis it's like the video you posted. Designed for creating a spiral on something horizontal to say the X axis. I think I'd have to buy the 5th axis capability in order to be able to have the rotary table turn while the cutter moves in the X direction as the spiral is created. So if I wanted to move the rotary table N degrees while moving X a spiral would also be created. I guess I'm having trouble figuring out the math for the G-Code. John > -----Original Message----- > From: marcus.bow...@visible.eclipse.co.uk > [mailto:marcus.bow...@visible.eclipse.co.uk] > Sent: April 10, 2024 12:00 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Carving a spiral > > As I recall, someone on this list posted a note or a link about how to > create a fusee for a clock (essentially a tapered spiral, running from > large diameter to smaller diameter while spiralling - rather like a > tapered woodscrew thread). Is a constant-diameter version of that what > you had in mind? > https://www.youtube.com/watch?v=KAAajypWQyw > > Sadly, I can't remember who contributed that note on this list. I do > think there may be a routine somewhere in the LinuxCNC electronic > resources. > > Marcus > > > > On 2024-04-10 06:55, John Dammeyer wrote: > > A friend and I have been discussing exactly how to write the G-Code to > > create a spiral scroll. > > > > His rotary table 90:1 reduction with a 1600 micro-step motor could be > > set up > > to move N steps for each step of the X axis to create the spiral. But > > that > > approach seems clumsy. > > > > Say I wanted to cut a scroll with a 6mm pitch using a 3mm cutter. > > > > > > > > Without using G2 or G3 it's really just a triangle isn't it? Move > > rotary > > table distance A and move X axis distance A'. Do it in small enough > > increments and you get a spiral. But I feel like I'm missing something > > really simple. > > > > > > > > Suggestions? > > > > Thanks > > > > John > > > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
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