Re: Unusual stepper ratings - vref settings for new Melzi
Thanks for the suggestion. Am inclined to leave it be now, since the new motors should be here on the weekend and I think it may be better not to risk upsetting the board potentially. I had carefully...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
To change microstep mode, normally there is a jumper or solder bridge. I looked at melzi page and it appears to have solder bridges from MS1&MS2 to 5v. If you check datasheet for a4982 chip, it...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Ahh ok, thanks. I'll add that to my list of stuff that I need to read up on about all of this. I enjoy finding out about this stuff, and Gcode etc, but I'm barely scratching the surface yet, and have...
View ArticleRe: Uploading marlin to printrboard, resulting in half speed/length etc
Your steps/mm in the firmware are set to match a different microstepping than what the board is set to. eg: the steps/mm were calculated for 1/8th microstepping, but your board is set to 1/16th, or...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Dunno about the chip, i was reading this page [reprap.org] and the there it says a4982, this is why i supposed you have that.
View ArticleRe: Uploading marlin to printrboard, resulting in half speed/length etc
Ofcourse... But still confusing since i uploaded the same exact code since last time. But yes this fixes the problem. Thank you!
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Hmmm, surprised it says that for the V2 version as I thought it was just the older boards using that, or the 4983, and the v2 had 4988 like my one. I think the main difference was the earlier driver...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
If you have different chip like a4988 then probably documentation is old or something, so you should also check what sense resistors you have, as these are in that relation between Ipk and Vref. The...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Sorry - I've cocked up here somewhere as I know I'd written already that the sense resistors on mine are 0.05 and I'd written out the calculation I was using but I can't see it, meaning I must have...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Then you need to change the math for Ipk=Vref / (8*0.05). Then i think vref of 0.23v would be what sort of caps the motors current, but thats sort of crazy low, basically with these motors adjusting...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
Hadn't thought of it like that I must admit. I was thinking that these motors would be trying to pull more juice than the drivers would want to do, thereby asking for trouble on the drivers if I...
View ArticleRe: Unusual stepper ratings - vref settings for new Melzi
The 30ohms coil motors cant pull more juice than ohms law, because supply is 12v then 12v/30ohms = 0.4a. And actually there is a frequency so the motor inductance L adds to the coil resistance so the...
View ArticleFirst Motherboard
I am new to reprap as well as 3d printers in general. I have been doing a lot of research and I have decided to build my own 3d printer instead of buying one. Although with all the research I have...
View ArticleRe: First Motherboard
Personally. I would go with a RAMPS. They are very well documented, easy to use and modular so if you break one bit, just replace it. Also RAMPS are available from many places, I think the RUMBA is...
View ArticleRe: Electronics help needed - rather urgent!
Thanks again, Noobman. Things went quiet for a bit, due to report writing etc. Looking up some ATX power supplies now, will probably fit the bill, although pretty large...
View ArticleRe: First Motherboard
Since you're new to 3D printing, I'd second RAMPS over RUMBA. The extra advantages that RUMBA has over RAMPS would be for a more advanced setup with two or three extruders, not typically the starting...
View ArticleRe: RAMPS for BeagleBone
I got notices from both OSH Park and the overseas vendor that my boards have shipped, so I'll hopefully be able to build one up next week. The overseas boards are coming standard mail, so might take a...
View ArticleRe: RAMPS for BeagleBone
Quotecdsteinkuehler Quotecdsteinkuehler QuoteDougl I would be interested in a kit if you do it even if beta./testing. I won't be selling kits, at least not for a while. Well, it turns out bobc over in...
View ArticleRe: RAMPS for BeagleBone
Quotecdsteinkuehler QuoteDougl I would be interested in a kit if you do it even if beta./testing. I won't be selling kits, at least not for a while. I've only got three circuit boards coming back from...
View ArticleRe: RAMPS for BeagleBone
QuoteDougl I was hoping you'd have had enough time to hear from people interested in PCB's so you could have ordered more than just 3 and also brought the price down. I haven't heard from many folks,...
View Article