Re: Sextupteron
NOTE: The Sextupteron can tilt 58 degrees so you can only do a 13 degree negative overhang if we obey the 45 degree rule. This restriction will keep the the layers fairly well behaved. This...
View ArticleRe: LISA Simpson
rather than continue on with the edits... I did some searching for motors. My guess was I'd have to ship things in from China and that would take a while. I decided on some ~ 400 oz-in NEMA-23's....
View ArticleRe: Sextupteron
If the build platform was to rotate independently (in conjunction with the Sextupteron upper) could you eliminate over hang restraints? (note: I have not read this whole thread and not sure if you...
View ArticleRe: LISA Simpson
The stepper motors look sweet! Add says round shaft, does that mean there is not a flat on the shaft? Will they work with the Mega: 4.2A? Fiberglass tubes softening at 140 F doesn't sound good. I like...
View ArticleRe: DELTA_EFFECTOR_OFFSET Question
My only concern about that diagram, is the DELTA EFFECTOR OFFSET goes from the ro pivot point, to the next axis pivot rod . But wouldn't the Centerline be th absolute center of the effector? I think...
View ArticleRe: LISA Simpson
Could you use threaded rods and threaded-on arm effectors to allow for easier tweaking or extending of arm lengths? Maybe two threaded rods in parallel like the bones in your forearm? Would give us...
View ArticleRe: LISA Simpson
QuoteA2 The stepper motors look sweet! Add says round shaft, does that mean there is not a flat on the shaft? Will they work with the Mega: 4.2A? Fiberglass tubes softening at 140 F doesn't sound...
View ArticleRe: LISA Simpson
@uncle_bob: With 400mm diameter by 500mm tall build volume you get 2^3=8 times the volume. Scaling is easy for this situation. Just double everything from my design. 4' screws will get you almost...
View ArticleRe: DELTA_EFFECTOR_OFFSET Question
In the picture it goes from effector center to the middle point of the two pairs of u-joints.
View ArticleRe: LISA Simpson
Ok, that's pretty much what I had guessed. I've been wrong before.... Still pondering on what size aluminum rectangular tube to use for the arms.... or even if it's a good matterial to use at all....
View ArticleRe: DELTA_EFFECTOR_OFFSET Question
Maybe this will be clearer... John's 3DR “Simple” Delta Printer Firmware Settings
View ArticleRe: DELTA_EFFECTOR_OFFSET Question
Quotedisneytoy My only concern about that diagram, is the DELTA EFFECTOR OFFSET goes from the ro pivot point, to the next axis pivot rod . But wouldn't the Centerline be th absolute center of the...
View ArticleRe: DELTA_EFFECTOR_OFFSET Question
Very helpful information. Thank you. Will have my arms fiished maybe tomorrow. Getting closer!!! Quoteddseeker Maybe this will be clearer... John's 3DR “Simple” Delta Printer Firmware Settings
View ArticleRe: LISA Simpson
@uncle_bob I'll conduct a FEA stress analysis for you so you can see how much the arm will deflect, if you provide the aluminum type (i.e. 6061, 2024, etc), the cross sectional dimensions, the length,...
View ArticleRe: LISA Simpson
I'm guessing that its going to be 6061, 1.5" x 3" with 1/8" walls. Torque from the motors is 400 oz-in and that's going to hit one end of the arm pretty much directly. The arms are roughly 20" long in...
View ArticleRe: LISA Simpson
@uncle_bob I don't think you have anything to worry about. Review the Lisa video: [www.youtube.com] A negligible load is being applied to the arm via the screw rotating, and the nut moving up and...
View ArticleRe: I'm stuck: Trying to set up Diagonal Rod Arms
I'm on a tablet now, so I can't provide a picture. If you want to make full use of your bed diameter, setting the rod lengths based on a. 30 degree angle when the head is centered won't allow you to...
View ArticleRe: LISA Simpson
My concern is that the head is in constant motion. As you run the screws up and down, the arms are the link that keeps the nuts from spinning wildly. If you are putting enough torque into the screws...
View ArticleRe: I'm stuck: Trying to set up Diagonal Rod Arms
Delta Rod length needs to be measured and most important is that all rods are as close to the same length as you can get them. You need to anchor your dimensions in the real world and delta rod length...
View ArticleRe: I'm stuck: Trying to set up Diagonal Rod Arms
Quotehercek #define DELTA_RADIUS (DELTA_SMOOTH_ROD_OFFSET-DELTA_EFFECTOR_OFFSET-DELTA_CARRIAGE_OFFSET) #define DELTA_DIAGONAL_ROD (2*DELTA_RADIUS) [forums.reprap.org] Not sure where that code comes...
View Article