![]() ![]() But I think disposable dispensing tips might be better way to deal with dry paint building up on the nozzles. Plus it'd make the dispensing tips easier to access and reduce the need for any kinds of pipes routing the syringes to the tips. I also wonder if you could come up with some sort of mechanism so at the end of the stepper motor screw's travel it engages the indexing mechanism, meaning you'd only need one motor. It would look very cool though, and having one stepper motor would make it easy to make it a fairly chunky one. And you'd miss out on the ability to draw paint back. More than anything I figure it'd be slow as each of the 5 colours is indexed and the stepper resets it's position for each plunger. I've been looking at finally building that big 3d printer first since some arrangements I had fell through, but ones that've freed up a bit of money I want to try spend before it slowly disappears on all the Good Stuff I shouldn't be buying. This might be another slow project though. That at the end of a dispensing stroke the stepper can pull the plunger back a touch to hopefully break the flow sharply and maybe pull whatevers hanging on the end of the nozzle back in. I've got some stuff to read on that but I think what might work is retracting or suck back. The main issue is how i'd handle (and eliminate) stringing. Yeah I think syringes seem most promising. It seems like alot to go wrong, or change over time, or with different paint thicknesses. I assume they work on the elasticity of the tube returning it to roundish to draw more fluid in at the start of the stroke, or from pressure on the reservoir to force it in. Plus for viscous fluids I wonder if there's a chance the tube could sort of. I did think about peristaltic pumps but i'm not sure how you'd handle the non linear flow rate. ![]() Ideally i'd want something that'd really jet the paint out to minimize strings and droplets hanging on the tips of the nozzles. The plastic syringes tend to flex a bit and trapped air bubbles up at the plunger end don't help either. Mechanically i'm also considering if there's a better way to dispense. I think more tests are in order, but i'm thinking about how I could try get some actual data to calibrate stuff with. And perhaps different pigment levels in each paint might affect the ideal proportions. What i'm having a hard time getting my head around is the idea that these volumes might need to be proportional to each other in some way. ![]() That's why im working on the assumption that the amount of white to mix in will be whatever percentage is left over from only the highest percentage of the other colours. The other thing is that CMYK in printing works by overlapping dots of somewhat tranlucent inks, and the white is from the background. Even jpeg compression shifted the shade of that colour swatch a bit. And that ambient light (as well as the colour balance between cameras and displays) will make it very difficult to get an exact match. I'm aware that the RGB display gamut doesn't entirely overlap with the gamut of CMYK, and i'm aware that displays are emissive where as paints are reflective. So there's a few things I sort of understand that I need to explain, or at least state that i'm aware of. To the right is adding 20% more black at a time to 60% to match the darker shade in that earlier image. So trying to match this target colour with 60% cyan, 20% magenta, 60% yellow, and 0% black by the CMYK colourspace.ĭispensed. (these are blunt needes, not much risk of accidentally injecting myself) Going with cyan, magenta, yellow, black, and white since that should give the widest range of colours possible from a handful of primaries. With the aim of making mixing colours for acrylic or oil painting a simpler process. I've got a vague idea that I could set up some stepper motors to depress syringes to dispense small amounts of primary coloured paints in small and hopefully accurate quantities to closely match a colour selected from an image on a computer. ![]() Been posting about this in another thread but thought I should make a dedicated one. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |