Quotevreihen I don't know if mashing the hotend tip into the build plate as a Z-probe is going to have any effect on the orifice size over time, but it is an interesting concept that I just stumbled on for the first time today. If you are afraid of that then it should be possible to modify it so that it works like capacitive displacement sensor. It would be more expensive though.by hercek - Delta Machines
Edits in strike-through and italic. QuoteA2 The only way you can get the units to work out using the new input of cross-sectional area is to proportionalize the area of the glass fiber bundles over 1 square inch before multiplying by the modulus of the belt, i.e. (1* inch * inch /(0.000434 * inch * inch)). If you don't do that you get meter3, which is a bogus conclusion. You are confused so mby hercek - Delta Machines
QuoteA2 Did you mean: A 1.0 meter span, of a T2.5 belt, with a 280 N tensile force (62.95 pound-force) elongated by 2.5 mm? Quotehercek That corresponds to elontagion of about 0.02mm per 1 meter of belt and 1 newton of force. This does not make sense, show your math. I do not have specification of the belt. The seller did not specify the producer. The Gates document does not mention T2.5 belts soby hercek - Delta Machines
Uff, ok, I took apart the rostock here and I measured the T2.5 belt with steel core. I pre-tensioned the 1.48m long belt with force of 190N. Then I needed to increase the force to 280N to make it longer by about 2.5mm (one belt teeth span). That corresponds to elontagion of about 0.02mm per 1 meter of belt and 1 newton of force. The glass core GT2 must be super hight quality to have this constantby hercek - Delta Machines
A2, I needed a break from this discussion. But I'll give you one more chance. Maybe you made only a mistake (maybe you are not trolling me). Why should I use a script which is different from mine and from the one specified in the Note 7 of the Gates document. In your script, the definition of B should have been: 124105648 * Newton / meter²; (Because the unit for their "modulus" was lb/in². Becauby hercek - Delta Machines
Based on experience from a rostock built from a kit. Quotegman 1. Should I go with rods or the printed rods? Will it really matter? Printed rods with u-joints weared out after about 10 hours of pringing. After that they had too big play. Go for rods with some ball-joints from an shop for RC models. Quotegman 2. Is there any kind of tutorial available? I'm mostly confused where to use which boltby hercek - Delta Machines
zsh> maxima Maxima 5.32.1 using Lisp SBCL 1.1.14 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) A: 1.0 * meter * 28.57 * Newton / (124105648 * Newton / meter^2); (%o1) 2.302070893663115e-7 meter^3 (%i2) ^D zsh> If you still do not believe itby hercek - Delta Machines
Hmm, I think the best option how to built an argument that GT2 belts are good enough would be to try to argue that the moment of inertia of stepper motor rotor is so big compared to the inertia of the carriage/platform/hotend/fan that the actuall dynamic forces on the belt will be too small to lead to any significant elongation. My hunch is that neglecting this is the biggest source of error in mby hercek - Delta Machines
QuoteA2 I found no contradictions in the Gates chart. Post the units, and show your work to avoid confusion. Claim 1 of the document: The last column of the table specifies unit as lb/in² for 1" wide belt. Claim 2 of the document: Note 7 specifies the formula for the belt elongation computation as BeltElongation = (BeltLength * TensileLoad) / TensileModulus. Lets specify what should be the unitsby hercek - Delta Machines
TheTechnicalNoob: thanks for the link. Hell, that documents must be writen by heretics of physics. Not only the authors use "hogshead" units, but they cannot even get it right, even with them. Ok, so they define modulus as lb/in² but (based on the formula (in note 7) for ussage of their modulus values) the unit is actually only lb. Or at least I hope this is what they intended (one cannot be comby hercek - Delta Machines
Maybe somebody who has both GT2 (fiberglass) belt and T2.5 (steel) belt can measure this for us?by hercek - Delta Machines
QuoteA2 If your load is well under the young modulus you don't have "meaningful" stretch. Well, as many times as it is below the young modulus, that many times the stretch is less meaningfull for unit length of belt. Anyway this is meaningless claim without some concrete numbers/examples in comparison to our delta bots. At least rmat claims dynamic stretch is a problem. Maybe he bought low qualitby hercek - Delta Machines
Edits in italic. Nice info A2. Unfortunately I believe insufficient to decide whether to go with glass reenforced belt or steel reenforced belt. OK, it is clear that curvilinear tooth profile is better than trepezoidal. I do not have doubts about that. The problem of using fiber glass instead of steel chords is different. I do not think it is as clear. I did a very rough computation for a T2.5by hercek - Delta Machines
Quoteepicepee use GT2 belts Does anybody have information about tensile modulus of GT2 and T2.5? Based on this post , you may want to prefer T2.5 belts to GT2 betls for big delta bots.by hercek - Delta Machines
Maybe firmware options: X_MAX_POS, X_MIN_POS, Y_MAX_POS, Y_MIN_POS. That is provided the software endstops are enabled (min_software_endstops, max_software_endstops). These settings are in Configuration.h.by hercek - Delta Machines
Do you like the fan duct? Can you compare it to simple fan (mounted on platform without any air guide)?by hercek - Delta Machines
OK, I guess you want it because of the single point z-probe, i.e. you have a z-probe hardware mounted on your machine and want G29 not to do the matrix based bed leveling (which is what most Kossel owners use) but only a single point probe. You need this if you want your delta bot as perfectly calibrated as possible (either manually or with the help of the calibration.wxm maxima notebook). This pby hercek - Delta Machines
Which source code are you trying to compile?by hercek - Delta Machines
How could be rod almost vertical when the head is half way to the tower? Ok, maybe you can call about 14° agnle almost vertical. Anyway it looks like you are geting about 0.25 mm Z-error when you move half the maximum possilbe distance (ie 50%) from center to a side. I do not know about rostock mini, but a clasical old rostock can be calibrated to move withing 0.05 mm z-height area when moving 75by hercek - Delta Machines
How did you find out what location did the head come to? Did you use M114 (Get Current Position) command?by hercek - Delta Machines
Quotewretan haha, sorry for my bad question about the SIN60 of course I know what value that corresponds to but I was curious about if the values should be changed if I made any other designs but I suppose that normal 120deg between towers. You can use different angles between towers than 120°. I do not think it is a good idea. Forces are better distributed when the angles are 120°. With differby hercek - Delta Machines
Quotewretan My goal is making the (heated) build plate approx 300mm in diameter and total height of 700-800mm (haven´t really decided yet). The bigger the horizontal size of a printed part the bigger problem with warping especialy with ABS. Quotewretan I have looked a little bit on the Marlin firmware and what difference does the Delta_smooth_rod_offset and the Delta_carriage_offset do? Especiaby hercek - Delta Machines
Interesting. I would guess it is not possible to level the bed (across all its area) and still getting Improper shape. My guess would be that if you have very well leveled bed (without the matrix based autoleveling), then the shape of the object should be correct though the size may be wrong. E.g. an obvious reason seams to be bad steps per mm for that tower, but this would be a linear error; disby hercek - Delta Machines
I assume the positions you reported are the resutl of Get Position G-code. You need to use netagive numbers in M666. But since you get too high z-position values at bed level that means your z-height is too big. First you need to shorten it by at least the maximum of the reported z-position vlaues. In your case it is 3.3. Lets use number 4. Then you will need to adjust by values (4-2.1, 4-3.3, 4by hercek - Delta Machines
Quotemikep-nz Sorry to contradict you but the build envelope is not cylindrical. You are correct. It is not cylindrical. Thanks for the correction.by hercek - Delta Machines
M666 (together with M500) can store its parameters in EEPROM if you have EEPROM inabled in Configuration.h. In such a case, you do not need to add it to slicer options. M666 is just a way to adjust edstops in software (instead of mechanicaly with endstop screws). It was writen so that you can do it precisely (it is hard to calibrate an endstop using a crew if you want 0.02 mm precision). Now, soby hercek - Delta Machines
QuoteAndyCart There must be a way to alter Pronterface, Repetier, Cura, etc to take these weird delta build platform planforms into account to maximise build area safely? KISSlicer allows you to specify STL of your built area. If you use deltaDiagonalRod = 2*deltaRadius then it is just a cylinder with the top like this (pictures are for deltaDiagonalRod=250mm):by hercek - Delta Machines
Quotemikep-nz Quotehercek #define DELTA_RADIUS (DELTA_SMOOTH_ROD_OFFSET-DELTA_EFFECTOR_OFFSET-DELTA_CARRIAGE_OFFSET) #define DELTA_DIAGONAL_ROD (2*DELTA_RADIUS) ... I worked out that a 2:1 ratio was optimal to give you the largest build area for a given rod length. But there is no requirement that the rods are exactly 2x the delta radius. That is purely a design choice. Yes, one can put diaby hercek - Delta Machines
Quotedisneytoy Do they mean the mid point between the two parallel rods? If so it should me 17.5mm. Yes, the distance from the effector center to the middle point of the two pairs of u-joints is the right one.by hercek - Delta Machines
#define DELTA_RADIUS (DELTA_SMOOTH_ROD_OFFSET-DELTA_EFFECTOR_OFFSET-DELTA_CARRIAGE_OFFSET) #define DELTA_DIAGONAL_ROD (2*DELTA_RADIUS)by hercek - Delta Machines