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

Smoke,
I'll back up Chris on this one... the Antares engraving cutters do a very
good job... I successfully run them at 10,000RPM and 2.0"/min feed...
sometimes in gummy material I have to do a second pass to clean up the
cut...

Bryan

-----Original Message-----
From: Smoke [mailto:gordonr@...]
Sent: Friday, 31 August, 2001 12:12 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Is there a comparison between milling
machines and software?


No, never even considered using a single flute cutter.
As an off hand GUESS, I'd think it wouldn't help.
The spindle speed is 6000 RPM and the cutter diameter is only 1/8.

Smoke

>Smoke,
>Have you tried to use single Flute Engraving Cutters ??
>These generally will cut even the softest of plasics without melting or

allowing

>material to stick on them regardless of RPM. These generally have more Chip
>Clearance.
>
>Check out: http://www.antaresinc.net/
>
>Best Engraving bits I have ever used.........
>
>Chris L
>
>Smoke wrote:
>
>> 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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