Awesome IBM 6182 pen plotter drawing an Aston Martin DB9
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- čas přidán 16. 06. 2013
- The IBM 6182 pen plotter from 1984, derived from the HP 7550, is the most advanced small plotter ever built. It has an incredible maximum acceleration of 6g, making it one of the fastest plotters ever. It was also the first plotter to include a sheet feeder, which allowed for unattended plotting.
Pen plotters were popular computer printing devices during the 1980's for printing vector graphics. They print by moving a pen across the surface of a piece of paper, much like a human hand does. This means their drawing capabilities are restricted to line art.
To be able to draw all sorts of shapes the plotter pen needs to be able to move across the paper on an X and Y axis. The IBM and HP line of pen plotters have a specific design where the pen moves along one axis, and the paper moves along the other axis ('grit wheel' mechanism). The pen is mounted on a carriage that moves back and forth in a line between the grit wheels, representing the orthogonal axis. These plotters became popular for desktop business graphics and in engineering laboratories for technical drawings. Starting from the mid-1990's pen plotters were gradually replaced by high-resolution inkjet and laser printers. Surviving pen plotters have often been converted to venyl sign cutters. - Věda a technologie
Awesome machine, and clearly in awesome condition.
Mesmerizing !!!
Apart from this very 6182's excellent motion regulation, I'd say a "travelling salesman's" problem solver has been used by the software/user which issued the vector file. Hence the perfectly optimized traces sequence.
I'd love to this this exact DWG used on an X-Y gantry device, such as a Roland plotter. Not saying it would be faster though. Just curious.
Fantastic!
mind blown.
Do you still have the DXF for this? I'd love to try running it on my Apple plotter.
Sorry, I was not notified you asked a question. Yes, I can give you the dxf. What Apple model do you have?
@@Wepouaout It's an Apple 410. Hmm, youtube killed the direct message function. My email is compu_85 at hotmail.
These plotters are wonderful. Do you know of any PC software that can drive them and plot a dxf? I recently got an HP 7470A with serial port. I actually wanted HPIB so will have to find another.
Use older CAD software to convert your data or print into HPGL format. Once you have HPGL format, you can set the plotter to receive HPGL data, then simply send the 'raw' HPGL data serially to the plotter. e.g. at a DOS prompt "type plot.hp > com1".
is it servo or solenoid for getting it up and down?
Both, in fact.
A solenoid gives the motion : cheaper, faster, sturdier.
But on those machine, it's used as a voice coil : the servo feedback is obtained with a linear quadratic optical encoder, and one of the finest optical metal grating I've ever seen on an 80's device. Pretty neat.
The only stepper one would find on these machines is for the pen carousel. Both axes were usually actuated by DC motors and rotary optical quadratic encoders.
Any inertial under/overshoot is suppressed by lowering/lifting the pen once the carriage is already in motion.
I want to make similar machine. What should i use? Servo or solenoid? Or stepper motor just to rotate pen.
Also what that plastic probe does? It think it proves how far the pen goes. What kind of pen is that. Looks made for fast application with ink in body.
Those are hard-felt conical-tipped pens. If I remember this correctly, HP had Staedler-like pens, which could endure a lot of abrasion without wearing prematurely. A coil actuation of the pen is more than enough, as long the fixture is radially stiff and axially damped.
As regards the motorization of your project, I'say it's a matter of knowledge/lazyness : using steppers is the easiest way in terms of acquisition/cost/control and tuning. Most gantry-style machines (Roland, W.Graphtec) used steppers. HP mostly used brushed DC servos for the transverse carriage : it's furiously faster (as seen in this video) and can provide a finer jerk without losing marks, as long as you PD analog servo controller is tuned properly ( that's the hardest part ).
And those DC servo's resolution is only limited by the amount of bits your DAC can provide. If you use precision opamp, 24 bits isn't a problem, as long as you can read the motor shaft angle with this kind of...finesse.
Still, most 80ies plotters used the HPGL protocol, which is limited to 16bits absolute coordinates (relatives coords where decimal though).
The plastic probe seen on the left side of the pen is not only a safeguard preventing excessive wear of pens: it's here to actuate the pen release mechanism when switching pens. In some models, I've seen it used as both safeguard/mechanical limit finger (Rotring valve-pens could be used, which could spill their juicy contents if pushed too hard... Poor things).
For xy i am sticking to stepper. I was asking about what is used for pen up and down. Also does it calibrate. What that plastic piece does? I never seen a plotter in person but have large experience with 3d printer
*****
I've already answered that. Just expand my previous response. ;-)