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RepRapPro's Ormerod http://reprap.org/wiki/Ormerod
Re: Mendel 3 Tri Coulor extruder drive instruction confusion - 8 years ago
What you have there is a extruder from a RRP FIsher 1, you should find build instructions for it within the Fisher Build instructions. it should work fine, but you may need to reconfigure the Steps per mm factor in the config.G file Really have no idea what the piece of wood is,it could be that RRP planned on upgrading the original Mendel kit with the newer Fisher extruder, and the wood is partby bgkdavis - General Mendel Topics
Re: How do you print with your Duet? Web or USB? - 8 years ago
Three duet printers all operate over the web interface, one has a PanelDue, but I only use that for simple control operations, homing, calibration or printing some stock partsby bgkdavis - Duet
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
if your getting repeatable deviations at 005 then it sounds like your nearly there, just got to get teh actual Z height rightby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
Quotedc42 It should be possible to find a set of probe points and corresponding H values that work well on most Fishers, or at least provide a good starting point. I don't have a Fisher, so I can't provide that. One thing I don't like about the Fisher design is the way that the carriages slide pas the microswitches to activate them. It appears to me that the trigger point will depend a lot on thby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
You can fix this by adjusting the h values but the easy fix just do your paper trap test at xy0 and enter g92z0.2 or whatever your paper thickness is, you can automater this by adding a move to end of bed.g to a fixed z height snd then doing a g92 to correct the height by the same amount as your paper test corrected kt.....it if your paper test read z0.3 before and 0.2 after then you could move tby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
after gluing wrap a cable tie around the part to help keep it togetherby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
put some paper between the bearing and the carriage sleeve then clamp on that .........sounds like your first job after getting your printer working is a new set of carraigesby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
loose bearings will do it, but make sure you follow my instruction exactly, you should be probing each position twice before you do the paper test, the second time without the P parameter, the reason I follow this method is more or less speed efficiency, the first probe move is really just a positioning move but you have to delete the P parameter to get it to do a z offset update.... after the seby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
Its actually fairly hard to get the springs wrong if they are sitting correctly, much of the fisher makes it fairly hard to build wrong. The problem with the paper test is its all about feel, so its really so you get a consistent feel each time, theoretically if you get a consistent feel the the height should more or less be the same. BUT, be careful about the point where the paper stops, at thby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
Its possible that the springs that are supporting the bed are too stiff or over compressed, each spring should be sitting on the axis motor via a hole in the baseplate. From Memory all the H values should be a negative value, if the Z position on paper test is positive, when the Z position is nagative you should use a positive value. I cant make out from your description whether your setting thby bgkdavis - Fisher
Re: Updated firmware and now homing and bed levelling is broken - 8 years ago
The fisher has a nominal150mm printable diameter, but it can be a little tight, sometimes a badly placed wire can cause obstructions and trying to probe at 75mm radius doesn't give much scope for error on an uncalibrated machine For probing drop your maximum probing radius down to 65mm. Nope the G4 commands are not needed Setting the H parameters on a fisher is essential, the fisher suffers fby bgkdavis - Fisher
Re: Dual X Carriage using M569 for tool change. - 8 years ago
I've worked on a few multi head industrial machines, and can strongly recommend not trying to do flying axis reconfiguration, unless you do a re home each time you can suffer lost counts when you do the switch over, and will possibly need to park the redundant axis into a placeholder in order to maintian hold currents, even if you do do a rehome you can still suffer lost counts if your home switcby bgkdavis - Duet
Upgrading heat bed - 8 years ago
I've been thinking about upgrading my heatbed,initially I was looking at going to 24VDC, but am reconsidering going to 240VAC with a SSR driven from the Duet heater output anyone got any reccomendations, Ive found this one with this SSRby bgkdavis - Delta Machines
Re: Extruder problems - 8 years ago
QuoteCrisCG Thank you for the replies. I understand it's a crappy chineze clone, but it prints perfectly on another printer. So switching to a e3d titan, may will solve some things, but surely not this one. The filament is spot on, 1.75mm and no moisture. Also it happens with diferent brands of filament. I will measure the thermistor temps and return with an answer. Yeah I too was sure this extby bgkdavis - Delta Machines
Re: Extruder problems - 8 years ago
You have a crappy HE3D extruder (or at least one from the same source), buy a E3D titan and your problems will disappear, they did for me!, at least you have a genuine E3D hot end already. Also it looks like your drive gear is biting too deep into your filament, this can cause debris to build up in the bowden and increase friction. next time you look at a jam inspect the filament between the exby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
....and there is filament, I've seen 1.75mm filament with a variation of anywhere between 1.6-1.9mm, this means for a nominal 0.3mm bead at a fixed speed you can have a size variation from 0.274-0.326mm if you really cant have this inaccuracy in your system why? and more to the point....your doing research on Wikipedia!?!?by bgkdavis - Delta Machines
Re: z wobble wavy - 8 years ago
is this a Kossel style delta, ie with 2020 aluminium extrusion uprights and rollers along the extrusion If so so a few moves from xyz=0 to xy=0 z=max and back again and watch the nozzle does it appear to snake side to side as it moves? also take a look at the carraiges as they move up and down do they all track straight or do they have a wobble? Finally look at all your rollers, do these ALLby bgkdavis - Delta Machines
Re: New RepRapFirmware release 1.12-dc42 - 8 years ago
Quoteaussiephil I'm comfortably seeing 640Kb uploads with the defualt supplied 4Gb MicroSD card. suspect this will jump a lot with a faster card Firmware Name: RepRapFirmware for Duet Firmware Version: 1.12a (2016-05-10) Web Interface Version: HTML: 1.11, JS: 1.11 just got 570Kb with my stock SD cardby bgkdavis - Duet
Firmware updating - 8 years ago
Just done my first web interface firmware update..... awesome development guys, very well done! Only issue I has was finding the 'secret hidden' instructions,but after several weeks detective work I finally tracked them down to a cunning plain sight locationby bgkdavis - Duet
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Having spent most my professional life building and controlling some of the biggest and most complex CNC machines in the world, I can honestly say, yes, I have seen timing belts used several times also seen hydraulics and even pneumatic drives, but generally we normally use servo drives and not stepper motors, plus if we actually want accuracy we use dual scale and encoder feedback systems and thby bgkdavis - Delta Machines
Re: DeltaXY - 8 years ago
My biggest concerns with this idea is how are you going to achieve Z axis, and the deflection under load of the arm mechanism between the two rails. which will have a tendency to rotate on the rails, which will put cross axis load on the mid point bearings, I reckon your really going to suffer from a lack of rigidity. Your could eliminate the rotation issues by having two pairs of parallel railsby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Quotehercek I think that you are going to create a pretty printer which will have a really bad price/performance ratio. Or you are going to build a slow printer in which case you should be rather building a cartesian. Anyway if you enjoy building it then just go for it. And post pictures! X2 oh, and take care of it, if you get this running at speed those ball screws are going to pack a helluby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Well, now your down to 400 steps/mm and 40kHz, at 100mm/s I can still easily upgrade my KosselXL to 0.9deg/step motors and get 200 step/mm. Remember the whole context that you started this thread with, was how much better 1600step/mm is than 80 step per mm and why you saw the ballscrew as a solution, with a 16 tooth drive gear 0.9 degree step motor an a 5:1 reduction box you could achieve 1000 sby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
1/32 micro stepping with a 4mm pitch is still 160kHz at 100mm/s, and you still don't want to run a machine constantly flat out, plus this speed is only your stepper speed, you still have to consider the block processing speed of the controller.by bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Quoteevandene I'm doing this for 35 years, i know what I'm doing. Don't make the mistake of thinking your alone..... As I said earlier, the mechanical construction is trivial, but don't forget a 200 step per mm printer working at 100mm/s with a 2mm pitch ballscrew will have to do 50 rev per second at 200 pulse per rev and 1/16 microstepping the controller will need to operate at a stepping frby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
QuoteKoko76 It's not shocking, and it has been "though of before". Sometime I forget that sarcasm is wasted on those who speak English as a foreign languageby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
I got he was talking about a leadscrew from the start, he may be talking about a ballscrew or a buttress threaded screw, but the problems are the same. But besides the obvious problems, lets take a little trip down this rabbit hole and see what we find. At first actually building the machine is trivial. leadscrews are not really an inventive idea, and in may respects they are easier since you dby bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
He was quoting motor steps, micro steps are fractions of motor steps. A well floated ball screw shouldn't induce error, but yes its a concern, and if your not familiar with floating ball screws then you could have a problem. My XL uses 16 tooth drive gears so its actually 0.01mm/step frankly this is more than enough really cant see anyone needing 0.005mm steps, and frankly my printer with its 1by bgkdavis - Delta Machines
Re: Why Spindle driven Delta's are more precise than Belt Driven - 8 years ago
Of course if you wanted to increase your steps per mm you can just use a reduction gearbox and you don't need to redesign the entire machine The next problem you develop is a loss of maximum speed, and since your running your stepper driver at a higher frequency probably more heat On the plus side you will get loads of thrust, and could probably run your effector with a direct drive extruderby bgkdavis - Delta Machines
Re: linear rods VS aluminum extrusions and pulleys - 8 years ago
Quotehercek My preference for linear rod over linear rails is easy to explain. I do not want to buy this stuff from a shop which does not specify tolerances. Rod manufacruers specify tolerances because rods have a huge range of uses where the tolerance is critical, this is not true for rails, the only dim thats normally toleranced is the mounting heights.by bgkdavis - Delta Machines