Hello, I'm looking for some springs for my Z axis lead screws. I found these but the postage for me (To the UK) was way too much compared to the cost of the springs: Would these be an acceptable alternative ? The wire is about twice the diameter but I'm not sure if that is acceptable or not - I can't find the intended size anywhere. Thanks, -Andrew.by yngndrw - General Mendel Topics
What board did you select in the tools menu ?by yngndrw - Sanguino(lolu)
Thank you all. Using Arduino 23 with the Sanguino extensions worked great. I had to move the new /hardware/tools/avrdude.conf file to /hardware/tools/avr/etc/avrdude.conf but aside from that it worked right away. I will leave you all with a quote: Quoteavrdude done. Thank you.by yngndrw - Sanguino(lolu)
I was originally using Arduino 22 but had problems with that and when I read up about it people said you needed 1.0+ for the ATMega1284P. I'll try 23 tomorrow, thanks.by yngndrw - Sanguino(lolu)
Hi all, I know there are a few threads with this problem but I haven't found any solutions and wanted to post my exact setup. I'm using Marlin RC3 from here: (Downloaded as the tagged RC3 version) I'm also using Arduino-1.0.1 and have "Gen7+Arduino+IDE+Support+2.0.zip" installed into /Arduino-1.0.1/hardware/Gen7/ directory. I have a Sanguinololu v1.3a with an ATMega1284P - It is pre-loaded wby yngndrw - Sanguino(lolu)
In this use, both sides are kept at approx the same temperature meaning that it acts just like a resistor. If you was to attach a heatsink / fan to the "cold" side, it would also operate as a form of heat pump, meaning that it would be more efficient in terms of the electrical energy used versus the heat produced on the "hot" side.by yngndrw - General
Regarding the standard power supply voltages, Meanwell do a 27V PSU and a 36V PSU, both of which adjusted. (The 27V PSU goes up to 32V and the 36V PSU goes down to 32V.) For a 350W 36V Meanwell PSU you're looking at £32 including postage from Ebay.by yngndrw - Controllers
It's clear that you have a very strong background in both embedded systems and electronics so I expect your project to go well. I can't really argue with any of your reasoning for the choices you've made except two things: 1) I believe the voltage thing does also apply to stepper motors, although having said that this is usually a point raised on full CNC machines where they are driven by leadby yngndrw - Controllers
The reason for the higher voltage is because a stepper motor is an inductive load. It is better for me to just link you to an explination by a drive manufacturer than for me to try and explain it as I'll probably miss something: The main part to look at is section #4 on that page, specifically this graph: It also reduces the trace current further which lowers the cable losses and allows for sby yngndrw - Controllers
Is there any plans on making a higher voltage version ? 48V ? How will heatsinking be handled ? Is the layout final or will things be shifted to allow for one large plain heatsink to be used ? Will a charge-pump / watchdog system be implemented ? Personally I prefer mini-USB connectors to Type B USB connectors but that's just personal preference.by yngndrw - Controllers
Ah okay, I ordered a 0.5C/W heatsink but after seeing yours I was wondering if it was worth leaving it with the aluminium double U channel which I've put on it for a heatsink. On one had I wouldn't have to desolder the MOSFETs but on the other hand with the large heatsink and a fan I should have no problems at all. I do intend on printing ABS in the future so I should probably just get it fitted.by yngndrw - United Kingdom RepRap User Group
Nophead: I just noticed that you aren't using a heatsink on the heat bed MOSFET - How is that holding up for you or have you changed it since ? I took a while away from the RepRap stuff so I have no idea what has changed since I was last here.by yngndrw - United Kingdom RepRap User Group
I just bought 12AWG silicone cable (The kind you'd use on a remote control car) for mine, not set it up yet through. It's also very heat resistant.by yngndrw - General
Your post has concerned me. I've just been finishing off the rest of my setup and decided to use some aluminium W channel as a heatsink for each MOSFET and the regulator. I just cut a ~3cm length for each one and use some kapton tape (No thermal paste) / nylon bolts to secure and insulate them. I indended to use 12 AWG cable and connect one end to the MOSFET tab and the other would be powered thrby yngndrw - Sanguino(lolu)
What did you have on the "cold" side ? Nothing or did you put a heatsink on it ?by yngndrw - General
This could possibly work better with the help of an encoder. Either an encoder on the extruder, or a linear encoder on the X axis. (It would be best to use an linear encoder on the X axis.) This way, the controller controller will know exactly where one of them are and can then calculate exactly where the other is.by yngndrw - Mechanics
Machdiamond: If the motors are broken anyway, you have nothing to lose by taking them apart and attempting a fix. Good luck with them, hopefully they will run find afterwards.by yngndrw - Mechanics
What is confusing is how they give a combined current rather than the current per winding. Anyway, for full power you'd want a peak current of 0.75A and a hold current of around half that to prevent excessive heating when they are stopped. Having said that running it at full power will make it warm up, so for a machine where the stepper motors are mounted on plastic mounts you'd want to lower thby yngndrw - Stepper Motors, Servo Motors, DC Motors
That's a fair point while it's at its final temperature, but when it starts heating from cold the temperature difference is going to be less. Therefore you should get a faster warm-up time and use less energy getting it up to temperature.by yngndrw - General
The reason for it is that a potentiometer is just a carbon track with a metal wiper which moves across it and as it turns it may jump. Some Pololus have caught fire (For other reasons) which suggests that they are rather sensitive. You wouldn't damage the stepper this way. The way I adjust mine is by measuring the voltage (With just 5V applied, the motor's power supply is off), switch it off, tby yngndrw - General
It's quoted as PPR on the site so I'd assume that is in edges, unless I'm miss-understanding it ? Edit: Oh, looking at the datasheet, you're right ! That's awesome news, thanks.by yngndrw - Stepper Motors, Servo Motors, DC Motors
miro87043 Wrote: ------------------------------------------------------- > Is it realy a bad idea to adjust pots while the > machine is on? I do that regularly while setting > up my printers. What's the worst that could happen > if doing this? It jumps as you turn it and you end up driving it with way too much current, or you slip and short something out.by yngndrw - General
L4ZX55 Wrote: ------------------------------------------------------- > beneficial This would depend on if you wanted to listen to said talk show. I'd doubt it would be harmful to the motors. (Unless it's a really boring talk show, where you may bore the motors to death.)by yngndrw - General
Thanks ! I couldn't find the R35i encoder on DigiKeybut the configurability of the CUI AMT encoder is ideal for me. I've placed an order for one so will see what it's like when it arrives. (The encoder is ~£16 on DigiKey - Came to a total of ~£34 with shipping and a cable.) I ordered: 102-1307-ND 102-1309-ND They are by far the cheapest I've seen and the fact that you can easily select the liby yngndrw - Stepper Motors, Servo Motors, DC Motors
ttsalo Wrote: ------------------------------------------------------- > At 60C temperature differential the peltier > element does pretty much no more useful work than > a power resistor would. And this applies both to > heating and cooling applications! I disagree, for heating they are ideal. Using either a reasonable size heatsink with fan on the cold side, (Or water-heating it toby yngndrw - General
Here's the full thread for it on CNCZone:by yngndrw - Mechanics
eranglr Wrote: ------------------------------------------------------- > Well - considering I got it free (birthday present > from a very good friend) - It won't be so > expensive I wish I had friends who bought me robotic arms for my birthday.by yngndrw - General
The first motor's optimal (And maximum) drive voltage would be 70V, but this mainly affects the top end speed which an extruder wouldn't really need. I wouldn't advise it for an axis motor, especially when using lead screws. The formula for the maximum voltage is as follows: = 32 * Sqrt() This affects the high speed torque and for this, the lower the inductance the better. This does however mby yngndrw - General
Please keep in mind inductance and supply voltage - See here: The ideal (Maximum) power supply for the first motor is about 42V. For the second motor (From Zapp) it's about 53V. The voltage will affect the high-speed performance. Pololus are only rated to 35V maximum, so realistically you'll want to keep them under 30V. As mentioned, Pololus are rated to only 2A maximum (With good heatsinkingby yngndrw - General
I'd just like to experiment with closed loop steppers - You can essentially turn them into AC servo motors with a very high pole count, which means that you don't need to gear them down. That and stepper motors are much cheaper than AC servo motors. Even with DC motors, I'd still need a source of cheap encoders so the same question still stands for that route too.by yngndrw - Stepper Motors, Servo Motors, DC Motors