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Commit c08d449d authored by Jake Read's avatar Jake Read
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README.md
View file @ c08d449d
# Roller Coaster Gantries
- kinematic mounts are three button head cap screws on 20mm grid w/ reciprocal / wherever-u-like mount ins
- all axis have scroll-along top plate w/ connection to motor plate, final scroll kinematic triangle
- all axis have scroll-along bottom beam plate w/ 20mm grid w/ last scroll kinematic triangles
## BOM
### Hardware
Type | Size | QTY | Where Used | McMaster PN
--- | --- | --- | --- | ---
SHCS | M3 | 2.5mm Hex | 91292A110
SHCS | M4 | 3mm Hex | 91292A116
SHCS | M5 | 4mm Hex | 91292A124
Type | Meaning
--- | ---
SHCS | Socket Head Cap Screw: machine screws with hex heads in a 'socket' - i.e. the head is the socket, not the driver.
FHCS | Flat Head Cap Screw: similar to SHCS but have triangular heads, used when making fastener surfaces flush.
BHCS | Button Head Cap Screw: rounded head socket heads !
PLSTCF | Plastic Thread-Forming Screws: have triangular lobed threads and torx drive caps, wonderful in plastics as the beefy threads mean no inserts required.
``` OLD DOC: move this to /kunits/README.md and /kunits/images ```
Scratch / Landing page for the roller-bearings and 2d-sheet-stock axis system.
With RCT, we break axis into individual kinematic elements - and roll those elements into machine designs.
......@@ -71,6 +95,22 @@ This set assumes you're building with 3/8" HDPE or similar, Nema 23 Motors with
! to add here
- hardware stackups, BOM, tuning note
## Notes for Jake
- RCT Mod
- tabs on rail supports still no bueno
- std. order side-wall taps / wall-to-surface -
- of course the belt tensioning needs help ... fold-over or something ? glue it down? single track?
- belt tender assy - 3dp walls, bearings to hold-down, m4 screws on to carriage at edges ?
- motor rotational tensioning: pin one
- and make tools for drill, tap 3dp
- also drill / tap m6 / m4 verticals
- m4.3 or similar nice for m4 thru on motor
- order up tiny clampz
## BOM
- [N17 Bearings](https://www.amazon.com/5x11x4mm-Replacement-Precision-Bearings-MR115-2RSBU/dp/B00Y5W3JYS/)
......
cad/elements/rctElementsN17/RCT Elements 17 XY Constraint v5.step deleted 100644 → 0
View file @ 627f9617
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ENDSEC;
END-ISO-10303-21;
kunits/README.md 0 → 100644
View file @ c08d449d
``` OLD DOC: move this to /kunits/README.md and /kunits/images ```
Scratch / Landing page for the roller-bearings and 2d-sheet-stock axis system.
With RCT, we break axis into individual kinematic elements - and roll those elements into machine designs.
![gantries](images/one-two-three.gif)
A reasonable system for beginners, and easy to manufacture (with another CNC mill). Particularely, this system begets the [Madison Park Vocational Machine](https://gitlab.cba.mit.edu/jakeread/mpvm)
![mill](images/mpvm-v03.jpg)
## Building Axis and Machines from 'Kinematic Elements'
Machines are made of degrees of freedom, and those degrees can be assembled from 'Kinematic Elements' i.e. here I have one Motor / Pulley Unit, as well as Lateral (into the gantry) and Cross (across the gantry) supports. I'm doing a mediocre job of explaining this, but here are some images:
To scratch a machine together, I pull elements into Rhino as .step files, and lay them out into axis - here's one linear degree of freedom:
![basically](images/kunits-basic.png)