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Messages - dar303

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1
General Mach Discussion / Re: atc spindle setup
« on: March 21, 2020, 05:24:36 PM »

3
Show"N"Tell ( Your Machines) / Re: Large Oxy Profile Cutter
« on: February 04, 2012, 02:47:06 AM »
Wow, that must be the biggest CNC I have ever seen under Mach control, impressive!

4
SmoothStepper USB / Re: Ethernet SmoothStepper first test
« on: December 07, 2011, 03:39:25 AM »
Any news of when it will be for sale?

5
SmoothStepper USB / Re: Ethernet SmoothStepper first test
« on: November 21, 2011, 11:13:10 AM »
Wow, cool news! I'm running an USB SS now and am mostly happy with it.
Please tell Greg to write a proper complete manual for it as I know that many are hesitant to buy one because of the apparent lack of support, unfinished product etc.
I will buy one for my next machine when you guys give it a green light!

6
Very nice! I love the pointy edges, it looks kinda stealth. You should do a custom canopy in this style perhaps:


7
Share Your GCode / Re: 12" Vinyl Record Lathe Cutting Stylus code
« on: November 09, 2011, 10:56:04 AM »
I made something much like this a couple of weeks ago, here is some example code for MatLab or (FreeMat) that generates a sine wave with selectable amplitude and frequency as gcode.
It's a work in progress, I haven't had the time to try i t all out yet!
I used a spring loaded diamond engraver to do the cutting and old vinyl records, anodized aluminium and PCB-material for the actual records.

R0 = 84;          % Start radius
dR = -0.5;          % Radius step per revolution
R1 = 55;            % Stop radius

N = (R1-R0)/dR;     % Number of tracks

rpm = 45;           % target rotation speed, rotations per minute
rps = rpm/60;       % rotations per second

f_sample = 1378;    % sampling frequency Hz
dt = 1/f_sample;    % delta time between samples

t = (0:dt:(N/rps))';  % time vector from start to end

R = R0 + dR*rps*t;  % Radius as a function of time t
fi = 2*pi*rps*t;    % Angle as a function of time t

X = R.*cos(fi);     % X coordinate as a function of angle and radius
Y = R.*sin(fi);     % Y coordinate as a function of angle and radius

Z_max = 0;                                   % antar att alla mÂtt ‰r i mm
Z_min = -0.5;

amplitud = Z_max - Z_min;
offset = (Z_max + Z_min)/2;
Z = (amplitud/2).*sin(2*pi*500*t)+offset;    % ny amplitud blir den ˆnskade delat p 2, den fˆr sinus vanliga amplituden

plot3(X,Y,Z);
axis equal

fid = fopen('test5 sjua.txt', 'wt');
fprintf(fid, 'G01 X%0.3f Y%0.3f Z%0.3f\n', [X Y Z]');
fclose(fid);


Here is some untested routines to insert a wave file into the code:
(sorry, comments in Swedish at the moment)

clear
clc
[Z,fs] = wavread('1'); %H‰r l‰ses wav-filen 1.wav in..
Z=Z-max(Z); %alla z-v‰rden flyttas ner under nollan.
RPM = 33; %varvtalet p skivan d den spelas upp.
R0 = 30; %skivans ytterradie
dr = 0.05; %avstÂnd mellan varven
p = .1; %skalning av z
t = [1/fs:1/fs:size(Z,1)/fs]'; %tidsvektor som bet‰mms av samplingsfrekvens och l‰ngd p ljudspÂr
Vt = t*(RPM/60)*2*pi; %Vinkel som funktion av tiden
Rt = R0-(dr*t*(RPM/60)); %radie som funktion av tiden
R= min(Rt); %innre radien
%X=Rt.*cos(Vt); %Freemat: radie och vinkel ˆvers‰tts till X-koordinat.
%Y=Rt.*sin(Vt); %Freemat: radie och vinkel ˆvers‰tts till Y-koordinat.
[X,Y]=pol2cart(Vt,Rt); %Matlab: pol2cart ‰r en funktion i matlab som gˆr det samma som de tv raderna ˆver.
Z = Z*p; %Skalningen av z
%plot3(X,Y,Z);
%fid = fopen('test.txt', 'wt');
%fprintf(fid, 'G01 X%0.3f Y%0.3f Z%0.3f\n', [X Y Z]');
%fclose(fid);

8
General Mach Discussion / Re: Slave 4th axis?? or better option
« on: March 19, 2011, 04:25:05 AM »
Very cool idea, remember to post pictures of your machine as we love to see unusal machines here!

9
SmoothStepper USB / Re: Mach3 & Smoothstepper Satisfactory Outcome
« on: March 15, 2011, 01:03:26 PM »
Thanks, great tip!
I ran a beefy wire from my machine to the ground-point in my control enclosure, that can't hurt!
Will test/poke it some more!

10
SmoothStepper USB / Re: Mach3 & Smoothstepper Satisfactory Outcome
« on: March 15, 2011, 05:26:53 AM »
Hi,

Nice to see that you resolved your grounding/interference issues!
My SS sometimes resets whern static jumps between my vacuum hose and the machine chassies when I touch them together while running a program.
Would you suggest I ground the machine to the same ground as the protective earth on the driver powersupply or to the OV of the psu? Grounding is complicated business!
Also, what kind of suppressors are you using?

Thanks,

Daniel

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