Quotedc42 I too use idler pulleys mounted on M3 screws. However, in my case the entire screw is free to rotate, with bearings at either end. This has been working well for several years. Thanks for the reply DC42 Do you mean that the screw turns with idler pulley? How is it possible for the screw to turn while its tightened to bearings with nuts?by Mj996 - Delta Machines
Quoteetfrench QuoteMj996 How about a seperate 3d-printed mount for this assembly that place on top of the frame? I have a hard time imagining a 3d printed mount that would be rigid enough So for a metal machined mount I need a lathe at least.by Mj996 - Delta Machines
Quoteetfrench No, it will just cause the bearings to wear faster. The most accurate method of making the holes is to use a boring bar on a lathe or a boring head on a mill. If neither of these is available, then using a new drill and a reamer should work. How about a seperate 3d-printed mount for this assembly that place on top of the frame?by Mj996 - Delta Machines
Quoteetfrench It should work fine. The only difficult part is ensuring the holes for the shaft are perfectly aligned. Sure that’s the tricky part. Don’t you think that with this kind of assembly we add a friction factor between shaft and bearings that needs more torque to turn and cause imprecision ? I use 6kg steppers by the way.by Mj996 - Delta Machines
Quoteetfrench The pulley has an 8mm bore. The shoulder bolt is 5mm. The two MF85ZZ bearings have flanges. The head of the shoulder bolt doesn't need a bearing shim, the threaded end does. I designed an idler assembly which contains a 8mm bore timing pulley driving on 8mm D-shaft which sandwiches between two 8mm ID flange bearings.(Please look at the attached image below) I would be happy to heby Mj996 - Delta Machines
Quoteetfrench The pulley has an 8mm bore. The shoulder bolt is 5mm. The two MF85ZZ bearings have flanges. The head of the shoulder bolt doesn't need a bearing shim, the threaded end does. Ok I got it. I think those kind of shoulder bolts are rare cause I couldn't find any.(and it seems that if you are not from US you can't shop from Misum unless you have a registered company). So back in the fby Mj996 - Delta Machines
Quoteetfrench You won't see much in a picture, just the head of the shoulder screw and the pulley Attached are images of the CAD model. The frame of the delta is Misumi 2550 extrusion. The pulley mount is attached to the narrow side with two locking bolts. The tension adjuster is just a threaded rod through the top plate (not shown) and uses a nut to adjust the tension. Once adjusted the locby Mj996 - Delta Machines
Quoteetfrench Is the bearing in the pulley riding on threads? If so, I'd be surprised if the bearings would last very long at all. I use pulleys with an 8mm bore, MF85ZZ bearings, and precision 5mm shoulder screws. Thanks for your reply. Yes, as you can see in the video The whole idler assembly is riding on a 3mm screw. It seems that your idler system is just Nice. Can you send some pics of yourby Mj996 - Delta Machines
Thanks for the reply MKSA Actually I tried a couple of idler pulleys from different suppliers but this happened to all of them. I agree that I should change the pulley size and belt type. Do you think changing the pulleys to 5mm bore ones and switching to fiberglass core belts will solve it?by Mj996 - Delta Machines
I got your point :"You get what you pay for" and those Gate's stuff are really high quality ones but Unfortunately I don't have access to high quality parts as I asked those suppliers and they told me that they don't have any shipping to my place.(Sad story) I really have no choice here So I should choose the best between the alternatives or find another solution for idler. So I have 2 options heby Mj996 - Delta Machines
Yes they match.However I double checked them and here are the datasheets: My idler pulley datasheet: Name: GT2 20 Teeh Timing Belt Pulley Picth: 2mm Teeth Number: 20 Belt width: 7mm Bore: 3mm Flange: Double flange screw hole: 2xM3 Material: Aluminium Alloy My belt datasheet: Product Name: 2GT timing belt Material: rubber Color: black Broadband: 6mm Pitch: 2mm I agree that the steel core beltby Mj996 - Delta Machines
I have changed my idler pulley multiple times but every time this happens after few days of printing ! Lubrication doesn’t make any change as you can see there is a serious problem with idler pulley. I’m using steel core GT2 6mm belts. I’m wondering what can cause this issue and how can I solve it. Any helps would be appreciatedby Mj996 - Delta Machines
Quotehercek I do not have an explanation how fixing a play leading to the carriage rotation can fix the problem with periodically changing wall thickness you presented in the first picture. Carriage rotation play leads to significant errors in the XY-direction. But the problem is that this play should lead to an error which has period of one layer. While the error in your picture has obviously peby Mj996 - Delta Machines
Quotedc42 The trick to printing small objects in PLA is to use lots of fan cooling and either print more than one at a time or reduce the print speed. Most slicers have a Minimum Layer Time parameter to slow down printing of small objects. Try increasing it. Thanks DC42.That helped a lot. So i tuned my retraction setting and now I almost have no stringing : As you can see That's not a good priby Mj996 - Delta Machines
Quotehercek More extruded material means thicker walls. Less extruded material means thinner walls. An eccentric pulley on extruder will cause variation in the extruded amount of plastic with the period corresponding to one pulley rotation. If the cube walls are thin enough and filament thick enough then one extruder pulley rotation will correspond to more layers and it may correspond to the pattby Mj996 - Delta Machines
Quotedc42 What is the pitch between the ripples? Is it consistent? Thanks for your reply DC42. a kind of.We can say almost 1mm for pitches. Ok I checked belts and pulleys and they match perfectly.I noticed that one of my carriages has a bit rotation.I can see my mag balls on that carriage rotating along the tower.I took a look at wheels assembly I turned the eccentric nuts so that the screw positby Mj996 - Delta Machines
Quotehercek I do not know DC42 idler pulley assembly. If the scratch happens only during homing and cause some error only when a carriage is near the home position then it cannot cause the pattern on your print. You must look for a periodic error along the part height. Not a one time error near homing. The homing error may be there but it is a separate issue. This is the idler pulley assembly.by Mj996 - Delta Machines
Quotehercek Probably not. 2 °C looks too low for it. Is the length of the period of the pattern the same as the timing belt pitch? Maybe something with belt not matching pulleys well? If your idler is not a toothed pulley then make sure the belt is turning around idler with its smooth side. Otherwise it would cause small errors with belt pitch period. Might be also eccentric pulley on extruderby Mj996 - Delta Machines
Quotehercek Most likely reason is wrong PID parameters for heat bed or hot end temperature maintenance. When temperature is fluctuating then also the distance between bed and hot end tip is changing. This change in distance has impact on the actual layer height of the layer currently printed. At the same flow speed that means wider or narrower wall leading to the pattern you see. Check whether thby Mj996 - Delta Machines
Hello all , I have a trouble with my Delta printer. As you can see in the image below There are some consistent lines on the walls of my prints. I'm moving carriages with wheels and belts on my printer. I checked my belts , eccentric nuts behind the wheels and tighten them all but the problem still exists. Thanks in advance for any help or advice.by Mj996 - Delta Machines
Thanks Alesky07.I have the same tought and I'm trying to figer out a way to solve this.I also think that there could be a kind of software(firmware) limit that doesn't let the hardware to move to the appropriate coordinates.by Mj996 - Delta Machines
Hello dc42 ,I used your calculator to calibrate my delta printer,but there is a problem ,the results don't seem right.I am sure that I measured the parameters nearly accurate. after 6 attempts in calibration calculator I got error message the second attempt had good results as I got about 40 mm errors at corners.but the fact is that the PRINTER RADIUS in that attempt was too close to the one thatby Mj996 - Delta Machines
Hi,I apologize if I'm posting in a wrong place. I'm running a large delta 3d printer with repetier firmware. the problem that is pissing me off is that the speed of the carriages are too slow ;like an old lady that is walking in a football field.I mean when i command G1 Z10 for example the carriages move with a super low speed.I checked everything but i couldn't find the problem. Here are theby Mj996 - Delta Machines