Re: [CAD_CAM_EDM_DRO] using a CNC mill to engrave metal

Your probably be right...as far as Sherlines go. I hadn' t given a thought
to what size machine was being used for the "engraving". Seeing as how I
don't have, and wouldn't use a Sherline in the first place, the point is
moot ...for me.

However, there are options like installing a very high speed air operated
spindle on the unit in lieu of the standard spindle. This would provide
plenty of speed for a .005 cutter. And you CAN cut Rockwell 38-40 with one
of these cutters. The secret is not to try milling to the full depth in one
pass....just like with any other larger cutter...and don't try milling at
top speed either.

Smoke

> With all due respect, I think your chances of success with an 0.005"
>endmill in a Sherline are pretty poor.
>You don't have nearly the spindle speed for such a small cutter, and you
>don't have the positioning resolution to control it well enough to avoid
>snapping it on the first entry move.
>Try to mill something like a firearm receiver at 38-40 Rockwell, and I

don't

>think you have a prayer.
>Besides, those 0.005" endmills are expensive!!
>Cheers
>
>Marcus
>-----Original Message-----
>From: Smoke <gordonr@...>
>To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
>Date: Tuesday, August 14, 2001 7:02 AM
>Subject: Re: [CAD_CAM_EDM_DRO] using a CNC mill to engrave metal
>
>
>>The biggest factors concerning what cutting tool to use would be the size
>of
>>the lettering and what sort of effect your trying to achieve with your
>>n"engraving". Since the depth of cut is only going to be a few
>thousandths,
>>you could do your engraving with a .005" (or so) diameter end mill. If

you

>>wanted the lettering to look more like real engraving, you could you an

end

>>mill with a tapered point.
>>
>>BTW...if you use a .005 or a .010 dia. end mill for cutting the letters,
>>you'l have some really accurate letter shapes which can easily be
>converted
>>for gold/silver inlay work. Sounds like a great idea for doing lettering
>>inlay work on firearms.
>>
>>Smoke
>>
>>
>>
>>>david albert wrote:
>>>
>>>> I was wondering if anyone has any experience using a sherline mill
>>>> with a CNC package as an engraver. Ideally, I would like to be able
>>>> to type some text on a keyboard and have the mill enrave some metal
>>>> down a few thousandths with what I typed. What end mill should I
>>>> use? What CNC software? Any web site you could point me to? thanks
>>>> in advance.
>>>
>>>if you are doing 2" high letters, a 1/16" or smaller end mill might do.
>If
>>>you are doing smaller letters, a flame-point carbide bur (Dremel-style
>>>tool) will do nicely.
>>>
>>>Jon
>>>
>>>
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>>
>>
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