Re: Open Source DC or BLDC controller
I'm using a stack of Arduino shields DC motor control, firmware at https://github.com/ezrec/BrundleFab-firmware It is very big and bloaty, and the DC motor control is very experimental, but the...
View ArticleRe: Servo motors on Prusa i3
I'm working on a similar project - I'm working on using a Adafruit Trinket Pro (ATmega323) for my ink sprayer control for my powder bed - Y axis is a DC motor + encoder (600 DPI) with a InkShield. The...
View ArticleRe: Servo motors on Prusa i3
I am in the process of migrating to a powerful 32-bit platform that will integrate motion planning and control loops. Most likely, control loops will take into account position and speed control, with...
View ArticleRe: Servo motors on Prusa i3
misan: Thank for the PDM Corp URL - very good information! /me bookmarks...
View ArticleNo retract with DRV8825 on Rumba
I have a Type A Machines Series 1 2014 with the Rumba 1.4 controller. It originally came with A4988 drivers on it. I had consistent issues with skipping on the extruder stepper when the driver got...
View ArticleRe: No retract with DRV8825 on Rumba
QuoterazzleThe DRV8825 behaves like the DRV pin is not hooked up. But the A4988 works just fine. I guess you mean the Dir pin. This can be masured with a voltage meter. 5V in one direction, 0V in the...
View ArticleRe: No retract with DRV8825 on Rumba
Oops, yes i meant the DIR pin. I will do some testing once my current print ends. But how would the driver chip affect how the Rumba board sends Hi/Lo to the DIR pin? I mean if the A4988 is getting...
View ArticleRe: No retract with DRV8825 on Rumba
QuoterazzleI mean if the A4988 is getting Hi/Lo on the dir pin from the board, wouldn't the DRV8825 get Hi/Lo as well? It should. If it doesn't, something is broken.
View ArticleTo Turn Fast or Slow, That is My Question
I'm a newbie. I want to use a small stepper to slowly tilt a 16" globe to simulate the seasons. Another would spin the globe in real time. The final drives would run indefinitely and extremely slowly....
View ArticleRe: To Turn Fast or Slow, That is My Question
Steppers have their maximum torque at zero RPM, so that's their optimum :-) To do just one rotation per day you likely want some gearing. It you move that directly you have just 3200 steps, which...
View ArticleChange of motors
OK so I built the Mendel using 17HS19-1684S stepper motors for all 3 axis and extruder. I then purchased the tricolour upgrade kit which came with different smaller motors (JK42HS34-1334A). I decided...
View ArticleSourcing stepper motors for Rostock mini pro
Hi to you all, I'm trying to build my very first 3d printer and I wanted to go for a rostock mini pro, I ordered a RAMPS and arduino (I know not part of the original design, but I wanted to try an...
View ArticleRe: Sourcing stepper motors for Rostock mini pro
Less torque means less acceleration, that's all. Less acceleration also means more precision. And pretty sure none of the steppers connected to a RepRap controller reaches 55 Ncm anyways.
View ArticleRe: Sourcing stepper motors for Rostock mini pro
Typo on the wiki then, any lower limit to that "less torque more precision" rule ?
View ArticleRe: Sourcing stepper motors for Rostock mini pro
I don't know suppliers in Ireland, but both RepRapPro and Think3DPrint3D in the UK sell stepper motors for 3D printers. See [reprappro.com] and [www.think3dprint3d.com]. But it's often cheaper to buy...
View ArticleRe: Sourcing stepper motors for Rostock mini pro
QuoteZxenopTypo on the wiki then Not neccessarily. Reaching nominal torque is possible, at zero RPM, with stepper drivers easily providing the neccessary current. QuoteZxenopany lower limit to that...
View ArticleRe: Sourcing stepper motors for Rostock mini pro
Quotedc42 But it's often cheaper to buy them on eBay, especially if you can wait for them to be shipped from China. Wouldn't mind the wait, but I'm mostly concerned about reliability, if you know a...
View ArticleRe: Sourcing stepper motors for Rostock mini pro
QuoteZxenop Quotedc42 But it's often cheaper to buy them on eBay, especially if you can wait for them to be shipped from China. Wouldn't mind the wait, but I'm mostly concerned about reliability, if...
View ArticleRe: Sourcing stepper motors for Rostock mini pro
Alright sounds reasonable enough, thanks a lot to you both for your assistance
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