Re: [CAD_CAM_EDM_DRO] Re: Is there a comparison between milling machines and software?

I modeled a part in clay, digitized it using the included unit/software.
Tried machining it it wax.

Tried some jewelry wax I use for investment casting and hard machinable wax
from MSC (same blue wax Freeman sells)..
No, this was not the wax that makes the metal rust....I don't get that kind
anymore!

The un-necessary machine moves during machining took place on both the
surrounding area and the actual part.
No tool changes were required as the entire job was to be done with the same
tool, therefore no re-zeroing was required.

I tried slowing the feed rate down but that didn't help either.

I also have machined both the waxes I tried on the Roland machine as well as
plain (very soft) candle wax on my bridgeport with no problems. All I had
to do there was slow the spindle speed an the feed to suitable rates.
Some people at other egroups sites have tried telling me the solution was to
change wax and/or feed rates. The main problem with the Roland MDX 15...as
EXPERIENCE has shown...is the inability to slow the spindle speed.

I even tried machining the machinable wax on the big Hass machine at school.
The same problem occurs there as well. If the spindle speed is to high, the
wax will melt and stick to the cutter. Eventually, the tool, becoming
"larger" in diameter due to wax buildup will force the block of wax to
shift.

Smoke

>"Smoke" <gordonr@...> wrote:
>Subject: Re: Re: Is there a comparison between milling machines and
>software?
>
>I don't know anything in the way of comparisons but I do know from
>experience on my Roland MDX machine that Rolands software generates a huge
>machining file which creates a lot of un-necessary motion. I know this just
>from watching the machine machine over the same area several times

machining

>air on the second and subsquent passes.
>
>[I'm not sure why this would be happening. Is this on the ambient
>(surrounding) area, or on your actual part? Are you re-zeroing correctly
>between tool changes?]
>
>I also know that on this machine it is terrible for cutting wax as the
>spindle speed is way to high for this material and is non-adjustable.
>
>[What kind of wax did you try, Smoke? Was this the infamous stuff that
>causes metal to rust? It actually works pretty well if you use the blue
>machinable wax from Freeman Supply (www.freemansupply.com.) and 2-flute
>cutters. You need that spindle speed if you use really small cutters, which
>is what jewelers who use these machines tend to favor.]
>
>
>Fred Smith wrote:
>
>>One thing to bear in mind if doing ANY comparison to the Roland
>>machines, they are built similarly to printers. There is not much
>>strength in the frame, the spindle mount, the spindle bearings, or
>>the axis drive motors. I have never heard from any Roland customer
>>that had successfully and satisfactorily machined metals, and even
>>plastics are problematic for some. Wax seems to be the preferred
>>material.
>>
>>I didn't answer your question, but maybe I helped you in your quest
>>for information.
>>
>>Best Regards,
>>
>>Fred Smith
>>IMService
>
>[I don't recommend these for 3d cutting in metal either. People have had
>better results using them for engraving on various metals, though. Some
>plastics are problematic, period, but machinable wax works okay, as does
>urethane tooling board like RenShape. The MDX-15 and larger MDX-20
>combination scanner/mills are much better at scanning than at milling, but
>it's nice that the same machine can do both things, with the necessary
>software included to go from one to the other. Anybody interested in one

(in

>spite of the bashing they've been getting here) should act immediately,
>because the Summer Special prices end Friday, and they will each cost $500
>more thereafter.]
>
>Andrew Werby
>www.computersculpture.com
>
>
>
>
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