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Re: Duet 3.3V supply quality - 11 years ago
Radian Not likely to get the scope out till tomorrow. Just looked at the regulator and it has 21RA NO5A markings. The no5a seems to indicate an LM1117MP-3.3, 21RA being a date code apparently. Do you have the same? As DC42 has said with high frequency scopes there can be a tendency to see things which are perhaps not there when the scope is not connected. RF pickup in the scope gby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Radian I would like to examine the circuit diagram of the duet but am unable to access through github, possibly due to my use of a Mac. Are you able to direct me to a copy? I need this to use my scope on the board to confirm your results are universal. Roryby Rory166 - Ormerod
Re: How to hold the bed down? - 11 years ago
Got the frame from Range. Mdf is too thick with the heater and all. It would be ok to cut slots in the cardboard insulator but I infact made a new one with norrower slots to accomodate the spring clip. See photos. Looks ok to me may have to increase spacing a little as the clips protrude 5mm below the pcb whereas the cardboard only 3mm. Rory PS. I have awoken next day seeing a flaw in thisby Rory166 - Ormerod
Re: Printer stopped before finishing print - 11 years ago
This whole affair reminds me of an occasion many years ago when I was involved with one of the first businesses to acually run on PC. It was a laser game centre. If the PC Crashed then the game was over and all the customers money had to be refunded. I was the sound and lighting contractor. They mentioned that the PC sometimes crashed so I built them a mains filter unit and they seemed happy.by Rory166 - Ormerod
Re: How to hold the bed down? - 11 years ago
DC You shameless spendthrift. Well now I'm off to the Range where the deer and the antelope play, to spend 59p Im sure they'l be grateful to me Roryby Rory166 - Ormerod
Re: Printer stopped before finishing print - 11 years ago
Radian Well when you put all your eggs in one basket. If the Processor crashes you loose control of everything. It might be nice to have a watchdog which will knock the heaters off if the processor is no longer functioning. I am thinking of possibly using a seperate controller to regulate the bed temperature. I did notice a very cheap temperature controller on ebay a few days ago. The sortby Rory166 - Ormerod
Re: What's inside an ACE ATX psu - 11 years ago
Hi both Yes DC I am familiar with the 110v arrangement but I had not seen the inductor's reappearance, takes me back to the valve days. Sorry to hear still no reliability Radian. The ATX supplies 4 12v cables to the two sockets we use, it would be nice if the bed supply could be fed seperately to the contol circuit rather than being combined at the connector board. Then we could try a seperaby Rory166 - Ormerod
What's inside an ACE ATX psu - 11 years ago
Hi All After much discussion of power quality on other threads I decided to look inside my PSU. Warantee I hear you cry, well ...... that I reply. Seriously they only cost a tenner. While I was at it I decided to snip off all those annoying disc drive cables. Wow what alot of stuff for a tenner and probably a fiver at the factory gate. The mains is full wave rectified and applied to two 470by Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Radian You are way ahead of me. Inductance tends to produce a negative pulse on interruption which is why a freewheel diode is normally used when driving an inductive load. Presumably the stepper drivers have these as a matter of course. Talk of 50V spikes is very worrying so I might suggest a 15V transorb to absorb any positive excursion. The recovery characteristic of this psu seems quiteby Rory166 - Ormerod
Re: How to hold the bed down? - 11 years ago
Asked my young lady and she produced a small picture which is no longer in use, see attached out of focus photo, but you get the idea. This looks ideal, the original frame has routered slots, in the mdf, to accomodate the end of the clip and I wonder if this would be a good idea for a really strong fixing. I cant belive no one has thought of this before, Ray you are a star. XYL mentioned theseby Rory166 - Ormerod
Re: Instructions improvement suggestions - 11 years ago
When fitting the z-axis sprocket please move description of whch way up it goes to the start of the section not near the end. Ignore as already done.by Rory166 - Ormerod
Re: From this to this in 3 days ! - 11 years ago
Hughsie Had you not noticed one of the arms seems to have fallen off! Roryby Rory166 - Ormerod
Re: How to hold the bed down? - 11 years ago
Ray great idea, I have some drawing board clips on order but your idea looks much better. Slightly frustrated that I must have thrown away loads of those things over the years. Roryby Rory166 - Ormerod
Re: Improving the proximity sensor - SUCCESS! - 11 years ago
Hi DC Yes I see that using FanO requires 12V, although I assume it would work with a lower voltage than it is intended for(all rails share the same common?). The point about the sunlight is that the output of the photo transistor needs to be kept low in case it is exposed to direct sunlight which might cause a huge increase in output, hopefully one might still pickup the modulation even over aby Rory166 - Ormerod
Re: From this to this in 3 days ! - 11 years ago
Hughsie Very nice indeed. Let's hope you mean most recent print rather than last. For a moment I had a horrible vision of the whole experience driving you to the brink. I wonder when we get two colours we can put convincing blue lines in the Marble? Leonardo eat your heart out. Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hi DC Seems I may have been a little too quick draw with the old soldering Iron. I like Ian's post above which I only read after fitting the cap. Feed the 5v rail from a 5v output of the psu. Let the poor old 12v take a right bashing from the switching transients. For that matter the psu also produces up to 30A of 3.3V so why not use that ? Roryby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hey Radian Im a Superfan Apologies for lack of focus but you get the idea. In what kind of mad world would you ignore a 5v supply and generate it from the stepping 12v rail? I thought the standby 5v supply was used to power the duet? There is an unused 5v power header position on the Duet board I read somewhere that Think Print direct boards use this? Rory PS whilst I was fiddling with my cby Rory166 - Ormerod
Re: Duet 3.3V supply quality - 11 years ago
Hi 57.3 Dgrees The ATX A-550BR supplied with the Ormerod is the cheaest of the cheap 10.50 plus VAT. I suppose they must cut corners somwhere, you could pay that for the fan (RS). Certainly amongst the PC snobs that inhabit fora they have an unenviable reputation. Let us hope your mod does the trick, I am standing by with juicy cap and baited breath. Roryby Rory166 - Ormerod
Re: Improving the proximity sensor - SUCCESS! - 11 years ago
Hi Chris This sounds highly promissing, presumably FAN0 could be switched fairly rapidly and continually but not so fast as the read rate of the A2D input so you get a stream of data background then IR-on and so on. The ballast resistor would need increasing but only to 270R for 40ma forward current. The load resistor will need reducing to 2.7KR as per DC42 experiments to allow for increased cby Rory166 - Ormerod
Re: questions about building - lnear bearings oil? and glue x-axis acrylic? - 11 years ago
Quotekwikius Thanks for all the replies. Will try gluing my xaxis parts with cyano and see how that goes. One further question re lubrication.. Quotedroftarts [...] 2. Yes, put a little light oil in the bearings if you wish, and wipe the rods before assembly. Because we're using larger 12mm bearings, rather than 8mm bearings used on Mendel printers, they are generally more robust. A drop of oilby Rory166 - Ormerod
Re: Fan backwash causes warping? - 11 years ago
DC I dont think simple spacers will do as the fan is intended to be sealed more or less against the 5mm long duct leading to the heatsink. Ian has mentioned that they chose a 20mm fan because they require a high static head to force air past the heatsink. The air then travels through a side duct into the nozzles. The nozzles are 1.5x8mm making a total area for the three of 36sqmm, in additionby Rory166 - Ormerod
Re: Ormerod MXL Belt Tooth count? - 11 years ago
Mitch Just to be clear the toothed belt should be in the bag marked Hardware set 1 of 5. It is with PTFE Tube, Tie wraps and Kapton tape. Because it is wound tight to a similar diameter as the Kapton tape I found it ivisible initially until my assistant said look here it is. Roryby Rory166 - Ormerod
Re: Improving the proximity sensor - SUCCESS! - 11 years ago
Ian Yes you can move the supply line to analogue output but then where do you get the supply for the receive side? I suppose you could rectify and smothe the Square wave to power the receiver side. I have procured/designed a circuit which does not require any firmware or wiring change, this is my prefered option but as I said before perhaps it is a generational thing, everything possible is doby Rory166 - Ormerod
Re: questions about building - lnear bearings oil? and glue x-axis acrylic? - 11 years ago
Erik I showed the rods to our machine shop manager at work and he said they are silver steel, I assume he knows his stuff. Aparently it can rust. The finish is ground for a good tolerance. Whay country are you from Erik? Roryby Rory166 - Ormerod
Re: My first own piece - 11 years ago
Hi dynayla Looks beatiful to me. Yes the file names are 3.1 type for now but due to be upgraded later I read somewhere. Roryby Rory166 - Ormerod
Re: Fan backwash causes warping? - 11 years ago
168 Interesting idea but I forsee some prctical issue with achieving the counter roation. Apparently these type of fans only rotate one way, if you reverse the polarity no movement occurs. I do not know if two different 10mm fans could be obtained with opposite rotation. How about putting an 8500 rpm 10mm fan fed by a 5800rpm 10mm fan. The slower speed fan would presumably generate much lessby Rory166 - Ormerod
Re: x axis carriage 9mm bearing not free - 11 years ago
Chris You are ahead of me build wise but looking at the data sheet for the sensor 1.5mm is the minimum spacing I would recommend for operation ie when the head touches. Roryby Rory166 - Ormerod
Re: questions about building - lnear bearings oil? and glue x-axis acrylic? - 11 years ago
168 Thanks I am so glad I didn,t act on my ill advised copper thoughts. Is 3in1 oil acid free? Roryby Rory166 - Ormerod
Re: Improving the proximity sensor - SUCCESS! - 11 years ago
Dc Well er no you could do it with analog electronics. Perhaps I am just an old .... bought up on op amps. Actually firmware alone may not do the job without more wires to the sensor pcb. At present there is 3.3V, o/p and ground. I would assume having created the modulation signal in firmware some means of getting it to the sensor is required. Roryby Rory166 - Ormerod
Re: questions about building - lnear bearings oil? and glue x-axis acrylic? - 11 years ago
Hi All I too was thinking the linear bearings feel gritty. I do hope the rods are well cleaned after grinding. Perhaps it is the ground finish itself we can hear/feel. I was also wondering about lubrication my thoughts were with "copper slip" grease but maybee machine oil or regular grease would be better. Being an electronics engineer I am not too clued up on these matters. Something that dby Rory166 - Ormerod