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April 26, 2018, 03:48:34 PM *
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 on: April 25, 2018, 09:14:58 AM 
Started by ArtF - Last post by ArtF
Hi Brian:

 I hadnt posted it yet. It is attached to this post though. Let me know if you have
any trouble with it, I cant recall if I modified any system libraries as tweaks to make it
work faster.

   I havent cleaned it up and documente d it yet, so its a bit messy.. Smiley


 on: April 25, 2018, 09:10:06 AM 
Started by ArtF - Last post by ElevenCubed

Do you have a link to your Arduino code used for the DAC signal conversio n?

Saw your youtube video and want to give this build a try with my diy style galvo motors.


 on: April 23, 2018, 05:14:36 PM 
Started by David Morrow - Last post by Mand
I'd like to suggest you consider writing an article on this for, well, I don't know who exactly -- maybe Fine Woodworki ng? Seems like there'd be a reasonabl y wide audience for this thing?

(I've just started my build, using a laser for the cutting so I'm building it up out of thinner sheets of BB ply, which is working pretty well so far. I guess we'll see when I get to the larger arm piece...)

 on: April 19, 2018, 10:10:05 AM 
Started by Mand - Last post by Nate
It's occurred to me I've been accidenta lly cryptic in all of this -- what I'm trying (again, foolishly) to do is develop a way to create a crown gear or rack gear using an engraving laser.

The original post had me wondering whether you wanted a "polar" height map or "rectiline ar" height map.   This makes a lot more sense.

 on: April 18, 2018, 10:58:07 AM 
Started by Mand - Last post by Mand
Amusingly enough, I'd *just* seen that video!  The technique would definitel y work I think (and I've even got an indexer), but alas my laser doesn't have the headroom to fit everythin g.

...althou gh, now that you mention it, I do wonder if perhaps I couldn't cut the crown teeth as a rack, using the variable-power engraving to add a bevel cut to each tooth (so that they come out separate, and can be reassembl ed into a circle). With some kind of centering-ring jig, and enough glue, it might actually work. Although, at that point, I should probably just knuckle down and clear out the garage so that I can access my mill and lathe, and start working again with the proper tools Wink

 on: April 18, 2018, 05:19:19 AM 
Started by David Morrow - Last post by TOTALLYRC
Nice work David.
It could be used for many different things besides clocks as well.


 on: April 17, 2018, 08:02:41 PM 
Started by David Morrow - Last post by David Morrow
Since my last post a few month ago, a couple of things have happened. First, I've had a few direct emails from people wanting the dxf's that were getting 404 errors from the forum when they tried to download them. I was quite happy to send them and have a few short discussio ns on the project. Second, I've done a fairly major redesign to simply the project. And I created a short Google doc's page showing the pic's and construct ion details. Email me directly if you'd like the dxf's. I keep messing about with them so you will always get the most recent versions this way. And finally, please be sure to tell me how your build goes and what, if any, suggestio ns that you might have to make it better. It's been a fun project.

 on: April 17, 2018, 12:57:47 PM 
Started by RConrad - Last post by ArtF

  Yeah, not very intutive, but when you think of it, that area under the rack is really
the rim of the gear.. were it round.. Smiley


 on: April 17, 2018, 12:14:59 PM 
Started by RConrad - Last post by RConrad
Perfect, works great.  I would have never figured that out for a rack.  Thanks.


 on: April 17, 2018, 11:43:13 AM 
Started by Mand - Last post by Dan Mauch
 Hmmm I'm wondering if a modificat ion of what I did with herringbo ne gears would work for you. The modificat ion would be that you laser cut two rings. One that was a full blank base and then the second would be a ring the inside and outside diameters set to the width of the tooth. Glue the the ring to the blank.The n using a stepper set parallel to the X axis this would be an A axis setup. Now you would use the A axis as an indexer to cut each tooth at 90 degrees. That way you would need only the tooth profile and a single pass for each tooth. See  but again instead of the 15 degree angle you would cut at 90 degrees.

Dan Mauch

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