The Duet and Raspberry pi4s have arrived so now the work starts.by Rory166 - General
Duet 3 boards have ariived and am stripping down the less complete machine. More details on duet forum.by Rory166 - General
Thanks for the advice ,keep it coming. Are there and drivers which are ok? Do I need to design my own? The Duet sounds promising I do have one I can use. I still doubt it can drive the motors directly. 40v 4A seemed about right to me. Will try to check what is written on the motors.by Rory166 - General
Well not directly but they are clearly the same ones. Thanks for the advice ,keep it coming. Are there and drivers which are ok? Do I need to design my own? The Duet sounds promising I do have one I can use. I still doubt it can drive the motors directly. 40v 4A seemed about right to me. Will try to check what is written on the motors. The 6600 is rated at 20kHz, is that slow? I have looby Rory166 - General
I have just bought the GT Gobal machines. The Ramps and arduino boards were found unused inside. It seems unlikely to me that the postage stamp sized stepper drivers will drive large motors so I am intending to get some 40v 4A drivers from Bangood.by Rory166 - General
see thread replicating ormerod. Yes you could save even more by using ramps but is it worth it to depart from standard could cost more in time lost. Roryby Rory166 - Ormerod
Hi All I have tested the 3.3 v feedback idea and can confirm it does not work. Interestingly inside the ACE psu I found there are already resistors to ground on the 5V output. There is also a cut resistor which I assume is used as some kind of adjustment presumably of output voltage. I would like to try reconnecting this to see what difference it makes. The schematics of ATXs which I have seby Rory166 - Ormerod
Hi All Just had a breakthrough. There is a 3.3V sense wire (brown) disconnect this from 3.3 V in Ormerod power board and feed from 12 v via potential divider. No need to open PSU case. R1 220R R2 82R will hopefully be low enough impedance to feed 3.3v feedback. Values quickly calculated to give 12.15V at Power board. Rory Edit It has been pointed out this will not work because 5v railby Rory166 - Ormerod
Hi All I have just seen photos of the Alpine PSU from Dieter and from memory this is the same PCB as the ACE. This does not mean it has the same components of course. But tends to confirm my suspicion that they come from the same factory. At least we poor ACE owners may be able to upgrade to Alpine spec? The idea of a boost converter from 5 to 12v seems a bit excessive to me. I wonder if fby Rory166 - Ormerod
Hi all Just been looking on the web for any info on ATX psus. Found an American article which is slightly interesting. It sets out to show that you can judge the quality of a PSU by its weight. Obviously not a generally applicable concept but they have found that amongst mass market ATX offerings those with properly rated components and adequate heatsinks weigh more than those lacking thesby Rory166 - Ormerod
Adrian Can't be of much help although I did have a cursory look inside my ACE. It would be good to have confirmation that the Alpine is indeed identical. It'd probable be cheaper and easier to buy a regulated 12v supply if one is that concerned. The main reason the kit vendors like the ATX so much is the ready done approval and safety for the mains connection. As well as being dirt cheap. Iby Rory166 - Ormerod
Things seem to be moving on. It would be useful for the uninitiated such as me if a record could be kept of the best firmware and software to use. and instructions as to where to find it and how to load it. Maybee the build instructions are sufficient? Roryby Rory166 - Ormerod
Hi I have now ordered some temperature controllers from the far east. At less than 5 pounds each including the sensor and a temperature display they should prove useful. I am thinking to have one as an over temperature shutoff for the hotend with the sensor on the heatsink and perhaps use another to control the bed temperature independently. Roryby Rory166 - Ormerod
Thanks I just think 50p per nut is outrageous. So far it looks like I will have to buy from the US or France. The French option looks good at 0.18 Euro each but the website is only in french so I am a little hesitant. At least no customs duty from France. Why no-one in the UK seems to sell these at a proper price I do not know. Roryby Rory166 - Mechanics
I have been trying to look at Github for the Duet PCB layout but so far only found a confusing mass of strange files with odd suffixes. Others seem to have used this ok. Roryby Rory166 - Ormerod
Ray I am not sure that these light transformers are suitable. The Ebay one has AC output and the Screwfix unspecified so rectification and smoothing may be needed. May be easier to use a second ATX. Rory Now see you cover this in earlier post.by Rory166 - Ormerod
Hi All Just seen another thread about overheated Ormerod. My fear is that once the firmware is more sorted and the processor is no longer freezing quite regularly this will all get forgotten about. My approach at work some years back was to use a second temperature controller module set to a higher temperature to knock off the power if the primary circuit becomes disabled for any reason. Therby Rory166 - Ormerod
Hi Rosario This is exactly why I started the over temperature shutdown thread. The response from RRP seemed to be that this had all been gone into before. Whilst the firmware behaves reliably then not too much of a problem but this is clearly not the case with Ormerod at this stage. Roryby Rory166 - Ormerod
Ian The majority of Ormerod customers on the forum seem to be new to 3d printing but, due to the RS source, engineers of some sort. We are not therefore aware of the discussions that have gone before. If this is such a well known problem then why has the Ormerod been launched with no such protection. It can be a sophisticated as you suggest, or it could be a deal cruder, but there needs to beby Rory166 - Ormerod
Thanks for all the contributions. I think it would be fair to say no solution has emerged as a clear front runner yet. One technique which would help with one aspect would be to drive the heater through monostable so that it would on for a fixed period when driven by an edge from the micro. This would not help with the missing sensor scenario, however that could be dealt with in code, somethinby Rory166 - Ormerod
Hi All There are many ways to solve a problem and I too am working on an aluminium bed support. As a prototype only I have folded 3mm ali to form the bearing mounts and added angle pieces to tie the verticals together. It seems strong and light but I am intending to add a few extra mm of height in order to continue the stiffness to the edge of the bed. When It is complete I will weigh it asby Rory166 - Ormerod
Hi All At work today I saw an interesting Fan which was 80x80x38 and supplied by RS. The interesting aspect was that it has a fixed blade array built in. The static pressure was quoted as 0.75 inch H2O which I thought interesting in todays metric world. The benefit of such an arragement would seem two fold: the mounting of the motor has a function rather than merely an obstruction and the moby Rory166 - Ormerod
Hi All It has occurred that when the processor stalls for some reason the hot end is left on and not regulated. It has also happened when the thermal sensor came out of the block. This is not acceptable in my view. Even the humble toaster will have some kind of over-temperature cutout. What do we think would be a simple way of providing this facility independent of the processor obviously. Iby Rory166 - Ormerod
Ian It is possible that not achieving the specified minimum load could cause shutdown, I had thought that it was more to help with 12 v regulation. RRP supply two brands of ATX psu , it seems the one shutting down is an ACE in this case , are all such of this brand? If so they could be replaced with Alpine which would solve the problem. Rory It seems this also happens with Alpine units, seby Rory166 - Ormerod
DC I wonder if it is possible to remove the blade from a cheap 10mm fan and reproduce with a coarser pitch? Any thoughts on the relative power consumption of the stages in a compressor? Andy I am interested in your pitot, my crude experiments indicate the first nozzle has much less flow than the others. I did design baffles to address this but an not printing yet. # Roryby Rory166 - Ormerod
DC By paying higher prices to RS and the like it is indeed possible to have the second fan faster ie 8,500 r.p.m. rather than the usual 5,500 r.p.m. these days. The current rating of the faster motor is also higher so in the event of no speed info. the higher current model should be faster. Roryby Rory166 - Ormerod
Andy I like the look of your second attempt, although I would like to see a smaller central boss. I know the fan is solid behind but I would still want as much air as possible. I am not certain about any curve of the blades so why not sit on the fence and have no curve. I must say I like the way this forum is progressing, I post a half thought rambling idea at 1.45 am and by 11.45am you haveby Rory166 - Ormerod
Markm My build has a terrific amount of Roll along the Y-axis. This is down to the right hand printed part. The T-nut fixing has too much material under it lifting the right hand beam end by a few mm. The part also cracked under the tension of the M6 csk trying to pull into the correct position. I am awaiting a new part from RRP. I suspect it would be better to have an adjustment and one deby Rory166 - Ormerod
Chris Very interesting results. It seems that the chaotic airflow situation we are calling backwash actually interferes with the flow through the fan. The louver as well as directing any backwash upwards as intended is also reducing such interference. My analysis of the situation is that because the output of the fan is severely constricted the air cannot all be driven forward by the fan asby Rory166 - Ormerod