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Old 12th February 2004, 02:25 PM   #21
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Have you figured out what to do with all those nice CNC cut MDF circles?

A great looking project.

Are you thinking about cutting aluminum or doing panel engraving with your machine?
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Old 12th February 2004, 03:57 PM   #22
herm is offline herm  United States
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I have plans to do aluminum, but they are far in the future.
I've got software to do picture-to-toolpath conversion for
panels, but I haven't used it yet.

I just picked up a pair of PHL1340s and two pairs of Vifa
XG18WH00 (from Vance Dickason, no less) that I need to
get boxes built for. Vifa DX25TG tweets coming from Parts
Express.

Dave - You are always thinking like I'm thinking ( does that mean
you are insane too?!?). I don't know what to do for stands.
I have thought of just cutting down the top plate of the stands
they are currently on. Then paint them the same color.

How do you like that fleck-stone paint? It covers a lot of little
sins ....

herm
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Old 12th February 2004, 04:43 PM   #23
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Its a fine line between insanity and genius. Ive spent all but a few moments of my life on the wrong side of the line.

What I wouldn’t give for a few moments of rational thought.

If you saved the MDF circles, you could use them with lengths of all thread to make speaker stands. Three or four pieces with EMT cut for spacers between the circles. It should come out nice and rigid with a sort of Jetsons look to it.
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Old 12th February 2004, 04:47 PM   #24
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Hmm. This really has my wheels turning now. My college roomate fooled with visual basic and managed to control a stepper motor through the serial port of his PC. Essentially, he did a very basic version of how this CNC is controlled. Building the mechanical part of the CNC wouldn't be beyond my abilities. I think I might need to start fooling with some prototypes of my own and see if I can build one of these puppies for way less than $2200.
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Old 12th February 2004, 05:11 PM   #25
herm is offline herm  United States
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The actual motor control is very easy - the software
turns the geometry into step and direction pulses which get
sent to the motor controllers.

Parallel port layout:

pin 2: x step
pin 3: x direction
pin 4: y step
pin 5: y direction
pin 6: z step
pin 7: z direction

It's really that easy. If have a few questions, send them to me.
I am currently getting my brothers set up with controllers &
stepper motors, too. If have enough computer savvy to do
CAD work, you have all you need to do this ...

Da5id4Vz;

All those little mdf cutouts have been going straight into the
woodstove. I knew I shoudl have saved them!
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Old 12th February 2004, 05:31 PM   #26
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Department of commerce sponsored a NIST program for open source CNC.

http://www.isd.mel.nist.gov/document..._Framework.pdf

http://www.sherline.com/emc/Developer_Handbook.pdf

A little more googling would likely find the source code.

I suspect that unless your a Linux wonk who really likes doing all of the required customizations, that purchasing a machine packaged with drivers and a decent software package is the way to go.

But this depends on your interests and resources. Are you interested in building machines, or are you interested in building stuff with machines?

I think that BTU conversion of the MDF scraps is as valid a use as anything. How is it on the chimney?

I'm still dreaming about a bridgeport with Fanouc controls, not that I have anplace to put it.
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Old 12th February 2004, 05:51 PM   #27
sobazz is offline sobazz  Denmark
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Herm, I suppose this enclosure gives you a lot of trouble with baffle step diffraction, or?
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Old 12th February 2004, 06:07 PM   #28
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Yeah, burning MDF might not be a good thing at all. I'm doubtful if it's at all good for the enviroment and you don't definitally don't want to breath in the fumes/smoke from burning it
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Old 12th February 2004, 06:08 PM   #29
herm is offline herm  United States
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sobazz;

Of course. Although I theorize that it may be easier to
correct because it it so uniform. I will address this with
the active cross when I get to it. I still don't have a serial
cable to talk to my Behringer, so I will hook up the Rane
tonight and listen without compensation.
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Old 12th February 2004, 06:10 PM   #30
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Quote:
Originally posted by Da5id4Vz


But this depends on your interests and resources. Are you interested in building machines, or are you interested in building stuff with machines?
Well, in my case it's more a question of "do I take the initiative to build one, or do I sit around wishing I could afford to buy one?"


Starting out with some super simple code, just to cut circles and squares shouldn't be extrordinarily difficult.
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