Clik here to view.
Grounded Experimental Delta Printer
I am pleased to present my first design iteration. Features: [*] Low vitamin count [*] Low friction (Nema14!) [*] Low center of gravity [*] Low weight [*] Can fold flat with some quick disassembly [*]...
View ArticleRe: Grounded Experimental Delta Printer
... with this big distances between the three bushings on the tool it would twist/bend while moving -- no chance for enough rigidity, even full metal parts won't be 'stiff' enough ...
View ArticleRe: Grounded Experimental Delta Printer
@VDX: Possibly. However, those are ball bearings on the tool. I think the low level of friction will make this work. I will try a mock up and see if it fails miserably. In my mind (an admittedly scary...
View ArticleRe: Grounded Experimental Delta Printer
... instead of 3 ball bearings I'll print/assemble a two-story horizontal ring-bearing - the middle ring will have two ring-grooves on top and bottom, the two outer only one ring-groove facing to the...
View ArticleRe: Grounded Experimental Delta Printer
I am not following. (I am not sure if you are saying this but I could instead of using one bearing for each connect point I could use two and increase my rigidity.) Side note: there is only really a...
View ArticleClik here to view.
Re: Grounded Experimental Delta Printer
... here a fast sketch - the 'bearing-storeys' are rings with grooves for the balls, so they can rotate free horizontally ... you have to add some compression system for joining the three 'storeys':
View ArticleRe: Grounded Experimental Delta Printer
Oh, I see. I like that. I am going to try normal bearings to see if that works. If not, I will try this out. Thanks so much for taking the time to sketch it up.
View ArticleRe: Grounded Experimental Delta Printer
for me it looks complicated, too much bearings, and very hard to make. i have no idea how to make it without very good cnc..
View ArticleRe: Grounded Experimental Delta Printer
Your right. There are 22 bearings total. However, they are all cheap inline skate bearings except for the 2 on the tool. (Note: my Printrbot has 6 rods, 10 linear bearings, 2 threaded rods, and 5...
View ArticleRe: Grounded Experimental Delta Printer
Interesting concept for sure. But it looks like it may be an inertia nightmare with that large wheels in the air. I'm assuming you calculated the required torque, and those belt ratios are the reason...
View ArticleRe: Grounded Experimental Delta Printer
@ShadowRam: If I print them solid (which I won't) the top pulleys will weight 40g each. However, I have not worked to optimize their size yet. I was trying to get a proof of concept down on paper so I...
View ArticleRe: Grounded Experimental Delta Printer
Interesting idea about the screw. Depending on arrangement, it could impede on the work envelope but I think that can be addressed. (I only worry about backlash.) I think it is a very workable idea. I...
View ArticleRe: Circular or hexagonal print bed
QU-BD has an 8" for $20 but it is also 24V. You can use two PC power supplies or get a regular power supply. I am sure that QU-BD will make custom ones for you if you are going into production.
View ArticleRe: Grounded Experimental Delta Printer
I don't know if backlash would even be a problem considering you would have gravity working for you to hold the assembly against the one side of the screw.
View ArticleRe: Grounded Experimental Delta Printer
Very true. However, I am dreaming of insane accelerations that will generate forces that overshadow gravity.
View ArticleRe: Circular or hexagonal print bed
I should point out that one of the reasons that the Onyx is so expensive is you pay for printed circuit boards by the square cm (raw board area), and it probably needs 3x the board space of a Mk1 or...
View ArticleRe: Grounded Experimental Delta Printer
nicholas.seward Wrote: ------------------------------------------------------- > Very true. However, I am dreaming of insane > accelerations that will generate forces that > overshadow...
View ArticleRe: Grounded Experimental Delta Printer
Experimentation will have to verify this but I think this setup will be wobble tolerant. The large wheels should be able to shake back and forth normal to their surface and the separation between...
View ArticleRe: Circular or hexagonal print bed
I think I'm just going to make do with an extra mk2 I have laying around. As I fine tune the printer, I'll revisit this.
View ArticleClik here to view.
Re: Grounded Experimental Delta Printer
Well, I have been getting lots of good feed back and am almost done with my second iteration. I have remodeled all the parts. All bearings are now captive. (They don't rely on being pressfit.) The...
View Article