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Re: Cam Grinding coding
Posted: Sat May 31, 2014 11:38 pm
by ArtF
Thats clever....
Art
Re: Cam Grinding coding
Posted: Sun Jun 01, 2014 4:16 am
by Mooselake
2.5D cam gcode could be handy for Kinetic and Rube Goldberg type devices, although that to-do list may already span too many volumes to fit on your (virtual) bookshelf. Isn't a grinding wheel basically a really big cutting tool, so the output would essentially be the same?
While I don't remember the reference, and google fell short, I read some time back in one those old out-of-copyright books that if gear making hadn't become "easy" that cams would have had a lot more prominent part of machine design.
Kirk
(OT) Really like the celtic knot laser plugin. Any plans to make a routable version? Expand it into a CNC Rose Engine?
Re: Cam Grinding coding
Posted: Sun Jun 01, 2014 5:53 am
by vmax549
Cam grinding SEEMS simple same with Crank Grinding , BUT IT AINT. When grinding a lobe on a rotary axis the point of contact of the WHEEL changes with the profile of the lobe as it rotates. There is a formula or three to correct the Z(grinder infeed) so that it translates correctly as the A (rotary) rotates.
Other wise the lobe you think you ground is NOT correct to the original profile. ]
ALSO as the wheel wears it must be compensated as well. That was the reason for cross over grinding a lobe pair( or as many as you select, you can do the entire camshaft at one time if you wanted . It just takes TIME to GRIND.
Just a thought, (;-) TP
Re: Cam Grinding coding
Posted: Sun Jun 01, 2014 6:29 am
by ArtF
>>(OT) Really like the celtic knot laser plugin. Any plans to make a routable version? Expand it into a CNC Rose Engine
Actually, I intend to add an engraving module to the CNC grouping, so I first needed
an engravable object and celtic knots sounded good to me for that. The knots will appear
shortly..
Art
Re: Cam Grinding coding
Posted: Sun Jun 01, 2014 11:22 am
by Paul Rusconi
Hi
There is a nice cam grinding program here that is worth a look
http://gcam.lucasemail.org/
GCam Forum
https://groups.yahoo.com/neo/groups/GCam_CNC/info
Paul
Re: Cam Grinding coding
Posted: Sun Jun 01, 2014 2:06 pm
by vmax549
(;-) They make a LOT of assumptions in that program(;-)
Re: Cam Grinding coding
Posted: Thu Feb 19, 2015 11:24 pm
by Mike G
ArtF wrote:
. Any out there also interested
in cam grinding as an output?
Art
I sure am.
Long wanted to do model engines, had the machines but not the time. Now that is reversed, have the time but no machines except for a small router and a bigger much stiffer one half constructed. Found Gearotic in my search for pulley solutions so bought it to make my own, thanks Art.
Next on the list is a small cnc lathe, 500mm BC, with a special focus on grinding , looking for an old mill table for a base, about 1 meter, to take the 35mm Hiwns.
Cams and cranks have always been the stumbling block for me and a cnc lathe with a focus on grinding should make that a lot less of a pain in the butt. Software for it is a stumbling block though, i have seen the online gcode generator one but don't like being tied to something that could go off line at a moments notice.
I hope this idea is still floating around in your mind somewhere, poised to surface about the time the lathe is finished ;D
As someone else noted, don't need a special machine. Its easy to adapt to a lathe or mill if only some decent software existed. Is it a case of build it and they will come or am I the only loon on the planet :D
Mike
Re: Cam Grinding coding
Posted: Fri Feb 20, 2015 1:18 am
by ArtF
Hi Mike:
Desire noted. :)
Art
Re: Cam Grinding coding
Posted: Fri Feb 20, 2015 6:41 am
by Mooselake
2.5D or 3D printed cams that don't require a 4th axis or grinder would be nice, too, if cams ever make it to the top of the list.
CAM was an unfortunate choice of acronym, makes googling (or binging :) ) for cam creation a lot harder.
Kirk
Re: Cam Grinding coding
Posted: Fri Feb 20, 2015 7:18 am
by ArtF
Hi Kirk:
The next module is making a gear ( or cam) from a formula you enter. SO a 3d printed cam isnt far away...
Art