Steve,
How would the stepper fit into my plan to etch the dial?
Rick
-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of AlienRelics
Sent: Monday, March 18, 2013 2:44 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a
graduated dial
Metal etching is on topic.
What about a stepper motor? 200 steps per revolution. Or if that is not fine
enough, bring that down with toothed belt and pulleys?
Steve Greenfield AE7HD
How would the stepper fit into my plan to etch the dial?
Rick
-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of AlienRelics
Sent: Monday, March 18, 2013 2:44 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: etching the OD of a cylinder to create a
graduated dial
Metal etching is on topic.
What about a stepper motor? 200 steps per revolution. Or if that is not fine
enough, bring that down with toothed belt and pulleys?
Steve Greenfield AE7HD
--- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber" <rgsparber@...> wrote:
>
> This has been a favorite problem of mine for a long time.
>
>
>
> It is standard practice to engrave the outside diameter of a cylinder
> with tick marks and numbers in order to make a graduated dial. I have
> done this by laser printing, mirror image, to clear plastic and then
> bolting it on the OD with the toner on the inside:
>
>
>
> http://rick.sparber.org/Articles/CD/CDM/d.pdf
>
>
>
> It is fairly rugged but not as nice as engraving. I've always thought
> that chemical etching would be idea.
>
>
>
> I'm not interested in super expensive methods or ones requiring more
> than average skill. Sure CNC can do this task, so can a laser cutter.
> Maybe Wal-Mart sells them. No fun there.
>
>
>
> One idea that I just thought of uses a previously engraved dial. I
> would turn a cylinder with the same OD as the dial. Then I would fill
> the grooves in the dial with softened paraffin wax and strike off so
> the rest of the surface is wax free. Then I would chill this dial
> while heating the cylinder to be etched. By rolling them together, I
> hope to transfer the wax from dial to cylinder. If that works, the
> etching process should be easy. I realize this generates raised
> features rather than recesses but that might actually be better. Since
> something like this works for printing, maybe there is reason for hope
here.
>
>
>
> Has anyone tried this? Any warnings or suggestions?
>
>
>
> Thanks,
>
>
>
> Rick
>
>
>
> [Non-text portions of this message have been removed]
>
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