Show all posts by user
Printing issues ...
Add Duet with extension board, silicone heater and SSR, cable chains, and a third lead screw/stepper to this design and you've probably ate most of you budget.
Thingverse Core XY
by
WesBrooks
-
CoreXY Machines
...after much faffing about I've decided to tie the negative side of the PSUs together, but not tie them to the ground. I'll be ensuring the frame is fully earth bonded and connected to the mains earth.
Edit: Earth bonding isn't essential here as there is no voltages on the machine above 24V. I've done this to reduce any charge build up and maybe electrical noise.
by
WesBrooks
-
Ormerod
Current wiring diagram plans:
Sheet 1: Power distribution & heater / stepper safety cut out
Sheet 2: Duet 0.6 wiring for core X-Y
Don't play too much attention to the colours & notes! These aren't final diagrams and I'm not generally overly reliant on colours of wires other than specials like earth bonding / connections.
by
WesBrooks
-
Ormerod
Project is progressing well. The machine frame and motions are built and I have temporary wiring in place to allow me to test things out. Waiting on a piece of tool plate for the elevator base. I've ordered parts to allow a pair of 24V force guided contact relays to cut the power to the heaters, and separated off the fans onto a separate PSU so that the hot end doesn't get really guey if the powe
by
WesBrooks
-
Ormerod
There are many ugly truths when digging around legislation and protections. You could carry out an ISO 13849 style assessment for our printers and you may well find that our standard interlocks and safety measures fall well short of what would be expected on an industrial machine. I'd say more often than not you are better protected in the work environment than you are at home - if your employer
by
WesBrooks
-
General
Quotenewbob
Industrial guidelines show the need for ventilation and that styrene concentrations above 100ppm require use of respirator.
The industrial guidelines linked are for industrial scale extrusion. 12kg/hr can be achieved from a small 25mm screw extruder. I'm in the process of upgrading an Ormerod 2 to a D-Bot. In the appendix it lists the maximum volumetric throughput of 12mm3/s. Taking
by
WesBrooks
-
General
No issues with what you say at all there. I'm only advising caution on how things are presented as we don't want to make things look an order of magnitude or more dangerous than they actually are. We are a group of knowledgeable individuals and have the experience to interpret the information we receive here. Outside of this forum, and specifically in business environments information and reports
by
WesBrooks
-
General
Ok, I'm still missing the real scare here. Capturing pollutants/emissions from the process is a good, and the right thing to do, but I don't think it is a massive heath scare compared to other things we tackle on a day to day basis like using cleaning solvents or even worse having a pint? For my own benefit how are you supposed to handle a contaminated active carbon filter? I presume this is not
by
WesBrooks
-
General
I'm going to have to get a big brew on hand when I translate all this understanding from being based on the nice simple Cartesian systems to the core x-y! Glad I'm not trying to understand the delta in this much information... ;-)
by
WesBrooks
-
General
Thanks for your comments. I've tried to reverse engineer the behaviour of laser based Additive Manufacturing systems before and your right, you can lean a lot about them by doing this but the results can be difficult to interpret if not careful. I've posted a similar message on the Duet3D forum and DC42 who is also on these forums has commented that a pending test release will have an improved si
by
WesBrooks
-
General
I've yet to catch up on the forum's posts on this matter but will be doing so shortly.
I believe there are a few parameters that have an affect on the levels of toxic fumes produced and these are predominately the quantity of polymer being processed, the length of time the polymer stays hot, and the ultimate processing temperature of the polymer. The quoted thermal degradation temperatures of ex
by
WesBrooks
-
General
Jerk! - 6 years ago
I'd just like to confirm my understanding of Jerk!
I understand the concept of the axis can instantaneously jump from stationary to the jerk speed but how is it applied when the axis is currently moving, particularly when there is a change in direction?
Would the axis need to slow to the point where the change in speed is less than the jerk, make the jump then continue to accelerate in the new
by
WesBrooks
-
General
Hello.
I would like to know which are the favoured build preparation and simulation software options? I'm considering Slic3r and Cura. Used Repetier in the past, but that now appears to have gone closed source.
With regards to the simulation I would like to be able to use the simulator to get an accurate build time that takes into account the jerk and maximum speeds as well as acceleration.
Th
by
WesBrooks
-
Experimental
This project is still running. I've got the system running on an ATX PSU at the moment but the bed heater is as expected woefully underpowered. In addition my shot from the hip on speeds and accelerations was overkill and resulted in many missed steps when I fired a build file at it stripped of all heat and extrusion commands.
As it is a closed system with binary file formats the required accele
by
WesBrooks
-
General
This is proving to be a right mess! My ATX PSU has the -Vs on the output side bonded to the earth. The passively vented single voltage PSUs that I have are isolated. In an ideal world it looks like the answer would be leave the output isolated to minimise any AC leakage and tie any shielding to the case/chassis and mains earth. However, for one of my current projects with an ATX PSU since the ATX
by
WesBrooks
-
Safety & Best Practices
Thinking a little further I'm guessing that the filter or what ever it is between the -ve and earth must be there to do something useful, and tying the -ve to earth would defeat whatever that is!
by
WesBrooks
-
Safety & Best Practices
Getting myself a little confused with the earthing!
Back ground: I've set my system up with 2 24V 1 5V PSUs. One of the 24V is a little one that I had kicking about and will just provide power to some guided contact relays which will make or break the power the the second main 24V PSU. The 5V is to allow the Duet to control kill the power to the heaters and steppers in the event of a temperature
by
WesBrooks
-
Safety & Best Practices
I think there have been a few people trying the carbon fibre tubes as rods. I think they wear much faster but would be significantly lighter than the steel equivalents.
Here's a good link for calculating voltage drop:
...and a rough guide on resistance per unit of length:
These issues will only really start to raise there head if you pull near the full rating of the cable.
Edit: Changed l
by
WesBrooks
-
General
I measured 28 ohm but didn't trust my multimeter too much last night as it was giving some funny readings. I'll put some volts from a battery through the coil and measure the resistance that way. The PSU with the printer was 19V but even that seems a little on the low side. Nothing obvious on the board that would step up the voltage but will take a closer look.
I don't mind 24V, it's just I woul
by
WesBrooks
-
General
Looks like the motors may be very close to the following:
Changzhou Yangs Motor CO, 42BYGHW208-42A, Stepper Motor 1.8 Deg - 0.4A - No. 20101226
12V rated which mean running at 24V is likely to be needed to get any reasonable pace from them. This may be more of a fuss than I had hoped for! These aren't an exact match visually, but the coil resistance is not far off what I had measured.
Step
by
WesBrooks
-
General
Come to think of it I've a drill, and a model aircraft prop rpm sensor somewhere... Would measuring the voltage on the motor at specific RPMs give a reasonable idea of the inductance?
by
WesBrooks
-
General
Hi All,
Think this is the best section of this forum for this message, feel free to move it if need be!
I've had the chance to help out in replacing a dead control board in an Up Plus 2 printer. I've nearly done with the wiring but I'm a little concerned about the motors as there are no identifying marks on them and I can't find the specification of them anywhere! Suitable replacements are list
by
WesBrooks
-
General
I've reasonable experience with building/designing/servicing additive manufacturing machines but far less so with the extrusion printers. I'm having to learning fast and considering a similar path to yourself. This is my 2p worth, more experienced fused filament users are likely to expand further or indeed rule out some of these comments!
I'm currently building a 300x300x300mm core xy based d-bo
by
WesBrooks
-
General
Judging by the wiring diagram if I am tying together the chassis, mains earth, and PSU output grounds to a single point then there is little point connecting both the 5V ground and V_IN ground is there? From an earth loops perspective it would seem good practice to just connect to the V_IN ground on the duet?
by
WesBrooks
-
Safety & Best Practices
Thanks for your feedback. I was thinking about avoiding earth loops on the system but had forgotten about the USB. I'll look out for something like this:
In the mean time is it best to unplug my laptop before plugging into the duet for firmware upgrade, setup, etc?
by
WesBrooks
-
Safety & Best Practices
Hi all,
I'm just drawing up my wiring diagram for my printer.
I've got 24V and 5V power supply units and I intend to have a double pole relay cut the live and neutral of the supply to the 24V PSU until the duet grounds the PS_On pin on the three way external 5V connector.
Can I join the 24V ground, 5V ground, mains earth, and cable/enclosure shielding all together? Are there some power supplie
by
WesBrooks
-
Safety & Best Practices
Go ahead for the project granted!
I've ordered the printed parts to short cut some time. Not sure how long that would have taken to print but in ABS with the nuts and bolts for £100 on ebay. I'll be keeping a close total on spend so will keep it well logged.
The Ormerod is highly likely to live again, but may not be anytime in the next few months! All that I'm taking from it is the Duet, steppe
by
WesBrooks
-
Ormerod
This appears to be a similar thing to that already shown:
Some industrial servos that I have worked with (indirectly) used a battery back up to allow absolute position tracking in terms of number of turns moved since last zeroing. I'd check if there is isolation of the power and electronics on this board and consider something similar.
End of travel zeroing is still useful for situations like
by
WesBrooks
-
CoreXY Machines
Quotedc42
... using bang-bang control can cause Z banding.
Do the older (2014ish) systems and firmware default to bang bang or PWM? The Ormerod suffered banding. I may have been too quick to blame the slight bend in the z-axis threaded rod!
by
WesBrooks
-
Ormerod
Good to know about the 12.5A through the Duet. That simplifies things.
With regards the SSR I was a little unclear. I was intending to fit a thermal fuse in a an appropriate place and fit this in series with the relays coil (with reverse diode) direct to ground from a permanent live. I would then just break the feed to the heater on the switched side. This way if the temperature sensor looses co
by
WesBrooks
-
Ormerod