hi all, when i align the seems, i get a bluge where it meets...kinda ruins the look, if i use not aligned theres nipple blobs every where too.. my quesrion, i've seen/read some where theres a way of reducing this, and something to do with getting curcles to meet when a little gap is left.. can any one point me in the right direction please? i'm literally just at the starting point, been printiby munchit1 - General
i'm a newbie ro the scene, but i cant help thinking if you have a cnc on the go.... build a frame for a printer?? 50 is slow..even for my dog tyred machine lol. 60mm/s is where it starts to be hours instead of minutes, 50, and i'm finding my plasric dont like it that slow, might just be me though, and the cheep plastic filoment. (90 mm/s is nicer..by far).by munchit1 - General
i've just been having a similar issue, with the click click click from the extruder teeth area, i slowed the prints 5mm/s a time till it hushed up. (i wasnt losing any extrution though.) i'll try the unclockit method next time. full storry, working fine untill long straight infill lines then click click untill the lines were shorter..hense i slowed stuff down a touch. (only getting about 65-75by munchit1 - General
i tried changing this n that earlier, changing to volumetric, and turning off relarive E on slicer cured the problem, but yewwwwww what a mess in the print after about 4 mil...also at the start of any 'bends' it left a big blob as it stopped momentaorily in a futile attemp to turn lol. next i reset everything that didnt help, then finaly i turned of the 'wipe on retract' and that seems to have sby munchit1 - General
Hi all, can anybody tell me whats causing this, or what setting to tweek? please? its at the start of the exstrude, no other time, filoment is set right, the width's are correct, etc etc...(seams aligned). (ohhhh yus i've searched...and searched. my hemeroids have a headache! lol)by munchit1 - General
QuoteAlexander1984 I would go for 30x30! it is much sturdier and has way better overall stability. Also i would not connect the aluminum extrusion by printed parts but rather thos metal 90° angles designed to connect the profiles. That way you get a frame you can sit on top or stand upon and it will be rock solid -> and Yes I am speeking out of experience - i build an enclosure with 30x30 extrby munchit1 - Extruded Aluminum Frames
QuoteMPower For Misumi, you can calculate the deflection using the following tables: wow? a 10 kg load at the center? for 20x20... edit make that 2kg.. last edit...eeee i forgot how to do it so non the wiser, ty any way gues its a secret lolby munchit1 - Extruded Aluminum Frames
Mpower? how much will the 2020 take? e.g. a meter span with a kilo weight on it?by munchit1 - Extruded Aluminum Frames
i just notised on this page theres some missing on the 'units used' bit at the end of of page. eg. theres a ' η ' that apears in several formulas but no mension og wtf it is? i beleive this is the factor of nerrr you dont know i do! lol....its why folks give up on maths as too dificult, theres always summut missed out. can any one complete the listings? or shed light to the mysterious 'η', itby munchit1 - Reprappers
thank you nophead, thats given me stuff to think on..by munchit1 - Developers
and part 2. ''Having just enough torque for the acceleration is not the best situation either as excess torque gives better positional accuracy because the motor will come to rest with an offset proportional to the static friction divided by the holding torque'' is this like the momentum builds up as it travels being greater than its start momentum, in affect stopping the preverbial car at 80mpby munchit1 - Developers
hmm, so i'd used forse as the mass.. and i'm asuming a nema 17 with 28Ncm holding torque is way ample for 1 kg on a pully system horozontaly?.............(asuming the ''So to accelerate 1kg at 0.5 m/s^2 the force is 0.5N. With a 5mm radius pulley the torque is 0.5 * 0.005 = 0.0025 Nm'' is A, the 0.0025 bit into Ncm is 0.25Ncm, and listed 28 holding talk are of diferent decimal places). http://by munchit1 - Developers
so to run through.. the X axis (printer head bars mounts etc total weight) say its 1kg, for ease.. mass would be = 1kg x 9.8 = 9.8 and the accelerasion i presume you choose one just to get started? so 9.8 x 0.5 m/s/s = 4.9 so the F = 4.9 n pully (on the motor spindle?) has a radiuos of 5mm i'll asume for the maths its in meters? 4.9n x 0.005m = 0.0245 torque.. in what denominasion?by munchit1 - Developers
ahaaa...thank you very muchly. just for by the by.. for any one starting or wandering how to play, you'll need some transposition... http://www.youtube.com/watch?v=UsMv7_Dg9-Uby munchit1 - Developers
lets start with? the gravity thing.. 9.8, the gravivity number is 9.8 (summed up to one decimal place). 'g'. so mass 'm' is the weight divided by the accelerasion of gravety, which is in the case of a printer, the weight it everything on that one axis, the print head the bars the bearings etc, weigh it or what ever...i'm in kilograms at the mo.(the numbers work out so much easier lol). mass =by munchit1 - Developers
Quotenophead You are comparing apples with pears because the NEMA23 is higher voltage and inductance so it will have more torque but be slower. A better comparison would be with a lower voltage NEMA23. Also the NEMA17 you picked is only 38mm long. A 47mm NEMA17 would have a torque of about 4.2kg.cm for the same current and voltage. It also depends on what driver you intend to use as that is ofby munchit1 - Developers
http://www.technologystudent.com/gears1/geardex1.htmby munchit1 - Reprappers
newtons second law. http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law is there a typo at the end of question 4? 4. Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is halved, then what is the new acceleration of the sled? Answer: 12 m/s/s The original value of 2 m/s/s must be multiplied by 3 (since a and F are directlby munchit1 - Reprappers
first step.. http://www.jvl.dk/files/_2011clean/pdf/la011gb.pdf some dooby ferks to look at.by munchit1 - Reprappers
has any one got a link to a no nonense site for all the calculasions for sizing the motors? boy have i read watch and heard some nasty re uterasions of the english words lol.. jusses its a what?....took me 5 sitting to figure out one guy was on about the radius 'r'...JUST COULDNT WORK OUT WHERE HE GOT TO TALK IN THAT MANOUR LOL. PLEASE? or can you lay it out with mising what the letters standby munchit1 - Reprappers
nema23 stats.. Specifications Size: 56.4 mm square × 56 mm, not including the shaft (NEMA 23) Weight: 0.7 kg (25 oz) Shaft diameter: 6.35 mm (0.25″) “D” Steps per revolution: 200 Current rating: 1 A per coil Voltage rating: 7.4 V Resistance: 7.4 Ω per coil Holding torque: 9 kg-cm (125 oz-in) Inductance: 10 mH per coil Lead length: 30 cm (12″) nema 17 stats Specifications Size: 42.3 mm squareby munchit1 - Developers
i was thinking two 1.7A nema 17's versas an equivelent of the two....hmm i see what you mean now i've started typing. ty.by munchit1 - Developers
hmm on me tod.. billy no mates boo hoo!by munchit1 - Developers
Quotesungod3k On wiki you find different grades of precision. "H9" is what I was looking for last time I bought some. Stainless steel should be hard enough but the precision of the roundness and straightness is worth looking at. and the budget is the rest. have you got any web sites showing prises for such steel at all?by munchit1 - Reprappers
so it looks like parralell for sure for conecting up. series tends to draw power to all the other motors in the curcuit when only one is taxed, verses parallell they tray and maintain the same speed but draw diferent powers to each irrispective of the others needs. so, that leaves what to power them with, what system? x y and z 6 motors 2 per axis.(posably two on the extruder...??) any one?by munchit1 - Developers
hi all.. if i run say 2 nema 17's, one on each X axis and one on each Y axis in 'pairs', would that in effect double the torque/power? or is it better to just run larger nema 23's.. as in does two cheepies perform as well as the bigger ones? which leeds to... conecting them up? whats the difference between parraleling the pair and series? pro's cons? (i've read a few places its better to rby munchit1 - Developers
hi all.. just my thoughts at this point, having not followed all the threads, so apologies if i missed any relavence. would the feed back be advantagous eather to DC or stepper drive systems? and 1200 dpi grid sytem would surely be good enough for even cnc presition? all the bits are out there guys..just in seperates. any one witht the golden dream.. ermmm, it goes like this, the backer taby munchit1 - Reprappers