16mm
/
contact_printer
1
0
Fork 0
Code Issues 5 Pull Requests Projects Releases Wiki Activity

Bevel the sprockets and add reinforcement to let a bearing fit without issue.

This commit is contained in:
Matt McWilliams 2024-01-25 19:47:32 -05:00
parent de1ef1492b
commit 11026922ad
2 changed files with 31 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
ino/motor_encoder_poc/motor_encoder_poc.ino
View File

@ -25,28 +25,28 @@
#define MOTORA 10 #define MOTORA 10
#define MOTORB 11 #define MOTORB 11
volatile int64_t posi = 0; // specify posi as volatile volatile int32_t posi = 0; // specify posi as volatile
const long maxTime = 100000; const long maxTime = 100000;
const int maxRotations = 10; const int32_t maxRotations = 10;
const int ppr = 11; const int ppr = 11;
const float ratio = 62.0 / 1.0; const float ratio = 187.0 / 3.0;
const int maxPulses = (int) round((float) ppr * ratio); const int maxPulses = (int) round((float) ppr * ratio);
const int speed = 210; const int speed = 255;
const int framesPerRotation = 18; const int framesPerRotation = 18;
const float pulsesPerFrame = (float) maxPulses / (float) framesPerRotation; const float pulsesPerFrame = (float) maxPulses / (float) framesPerRotation;
volatile long start = 0; volatile long start = 0;
volatile long total; volatile long total;
volatile bool done = false; volatile bool done = false;
volatile bool stop = false; volatile bool stop = false;
volatile int incoming; volatile int32_t incoming;
volatile float rpm; volatile float rpm;
volatile float fps; volatile float fps;
volatile float fpsMax = -1.0; volatile float fpsMax = -1.0;
volatile float fpsMin = 100000.0; volatile float fpsMin = 100000.0;
volatile int rotations = 0; volatile int32_t rotations = 0;
volatile int lastRotationPosition = 0; volatile int32_t lastRotationPosition = 0;
volatile int lastFramePosition = 0; volatile int32_t lastFramePosition = 0;
volatile int frames = 0; volatile int32_t frames = 0;
float calculateFPS (long timeLength, int frames) { float calculateFPS (long timeLength, int frames) {
return 1000.0 / ((float) timeLength / (float) frames); return 1000.0 / ((float) timeLength / (float) frames);
@ -79,7 +79,7 @@ void setup() {
} }
void loop() { void loop() {
int64_t pos; int32_t pos;
// Read the position in an atomic block to avoid a potential // Read the position in an atomic block to avoid a potential
// misread if the interrupt coincides with this code running // misread if the interrupt coincides with this code running
// see: https://www.arduino.cc/reference/en/language/variables/variable-scope-qualifiers/volatile/ // see: https://www.arduino.cc/reference/en/language/variables/variable-scope-qualifiers/volatile/
@ -92,7 +92,10 @@ void loop() {
if (rotations != lastRotationPosition) { if (rotations != lastRotationPosition) {
lastRotationPosition = rotations; lastRotationPosition = rotations;
frames = rotations * framesPerRotation; frames = rotations * framesPerRotation;
Serial.print("Rotations: ");
Serial.print(rotations);
Serial.print(" = ");
Serial.println(millis() - start);
} }
frames = (int) floor((float) pos / pulsesPerFrame); frames = (int) floor((float) pos / pulsesPerFrame);
if (frames != lastFramePosition) { if (frames != lastFramePosition) {
@ -105,11 +108,11 @@ void loop() {
if (fps < fpsMin) { if (fps < fpsMin) {
fpsMin = fps; fpsMin = fps;
} }
Serial.print("Frames: "); //Serial.print("Frames: ");
Serial.print(frames); //Serial.print(frames);
Serial.print(" = "); //Serial.print(" = ");
//Serial.println(total); //Serial.println(total);
Serial.println(fps); //Serial.println(fps);
//Serial.print("@"); //Serial.print("@");
//Serial.println(pos); //Serial.println(pos);
} }
@ -123,7 +126,7 @@ void loop() {
digitalWrite(MOTORB, LOW); digitalWrite(MOTORB, LOW);
start = millis(); start = millis();
rotations = 0; rotations = 0;
} else if ((stop || millis() - start >= maxTime) && !done) { } else if (stop && !done) {
digitalWrite(MOTORA, LOW); digitalWrite(MOTORA, LOW);
digitalWrite(MOTORB, LOW); digitalWrite(MOTORB, LOW);
//Serial.print("Final: "); //Serial.print("Final: ");

13
scad/contact_printer.scad
View File

@ -23,7 +23,7 @@ FrameY = 175;
FrameZ = -16; FrameZ = -16;
Sprockets = 18; Sprockets = 18;
SprocketedRollerBevel = false; SprocketedRollerBevel = true;
SprocketedRollerModel = "gearbox_motor"; SprocketedRollerModel = "gearbox_motor";
SprocketedRollerSetScrewTop = true; SprocketedRollerSetScrewTop = true;
SprocketedRollerSetScrewSide = false; SprocketedRollerSetScrewSide = false;
@ -923,6 +923,17 @@ module sprocketed_roller_upright_solid (pos = [0, 0, 0]) {
} }
} }
//reinforce space abover motor shaft
translate([0, 0, 4]) difference () {
cylinder(r = R(10.5), h = 9, center = true, $fn = 80);
cylinder(r = R(3), h = 9 + 1, center = true, $fn = 40);
}
//offset bearing
translate([0, 0, 8.5]) difference () {
cylinder(r = R(23), h = 2, center = true, $fn = 80);
cylinder(r = R(19.8), h = 2 + 1, center = true, $fn = 40);
}
//reinforce overhang //reinforce overhang
translate([0, 0, 2.6]) difference () { translate([0, 0, 2.6]) difference () {