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--- 04_projects:02_kinetic_sand_table [2024/12/20 20:18] – [Stepper Motors] jattie
+++ 04_projects:02_kinetic_sand_table [2024/12/20 20:39] (current) – [Linear Stage] jattie
@@ Line 133: / Line 133: @@
 ===== Linear Hardware =====
+==== Stepper Motors ====
+My stepper motor choice is from what I already have on hand, is popular and abundantly available. Any Nema 17 motor will suffice.
+^Brand| Creality 3D 42-40|
+^Item Name| RepRap 42 Stepper Motor|
+^Article number| 42-40|
+^SKU|3204120126|
+^Step angle| 1.8degrees|
+^Rated voltage| 4.83V|
+^Current rating| 1.5(A)|
+^Rated speed| 1-1000(rpm)|
+^Rated torque| 0.4(NM)|
+^Ambient temperature| -20 ℃ ~ + 50℃|
+^Length| 40mm|
+^Application| 3D printer|
+^Shaft| Round shaft|
+Using this stepper in conjunction with a TB6600, simply set the current limit to match that of the motor selected, regardless pf the voltage supplied to the controller. The controller regulates the current limit set up from the dip switches. ((https://community.robotshop.com/forum/t/power-supply-requirements-for-stepper-motor-controller/28483/4))
+==== Linear Stage ====
+For my linear stage I decided to venture off the well travelled path and investigate alternative rail options.
+Browsing at my local hardware store I found polished oval rails like these and started working of a 3D printed design that can use cheap 3D printed options to turn these into a linear stage.
+{{:04_projects:screenshot_2024-12-20_202050.png?direct|}}
+{{:04_projects:screenshot_2024-12-14_173744.png?direct&400 |}}I created some oval shaped linear bearings for starters and testing them on the rails.
+The were designed with very tight fit tolerances.
+{{:04_projects:screenshot_2024-12-16_140548.png?direct&350|}}{{:04_projects:screenshot_2024-12-16_140559.png?direct&350 |}}
+Then created some bearing holders with idler pulley holders and mounts for the cross bar.
+The cross bar fit was also tight and I used a mallet to drive it on to avoid play. I realised I did not fit the bearing and designed a split bearing.
+The bearings are here: https://www.printables.com/model/1108249-oval-tube-linear-bearing-15x30x50mm
+The gantry sliders with bearing and idler pulleys are here: https://www.printables.com/model/1111593-oval-profile-linear-stage-single-bearing