diff --git a/README.md b/README.md index a9e6fc8a11762fbc4e73361ed23289dd836f3abd..64457d00c17f01bd09a80624108601edc9c3f514 100644 --- a/README.md +++ b/README.md @@ -37,15 +37,29 @@ Make sure to change 'type' to .step, and check the 'save to my computer' box. No # Material Choice - - bring over notes on material choice +I've made a little table of different materials we can use. Typically, I stick with Aluminium (on a waterjet) or Acrylic (on a laser). Alternately, Delrin or HDPE can be machined, Delrin is medium-ok to lasercut, and I haven't tried (but am curious about) composites like FR4 and FR1. Probably more towards FR1: glass is a PITA to machine. - - acrylic, cool, but req' move to heat-set everwhere: cannot tap cannot heat-ineret (very well) +In the fullness of time, and with infinite fab, I figure gantry components (especially elements which see bearing contact) should be made from steels, water or laser-cut. + +| Material | Young's Modulus (GPA) | Specific Young's | Cost for 6mm x 24x24" | Machinability | +| --- | ---: | ---: | --- | +| ABS | 2 | ? | 52 | Not Dimensionally Stable, but OK to Machine | +| Nylon 6 | 3 | 2.5 | 130 | Painful | +| HDPE | 1 | ? | 23 | Easy | +| Acetal (Delrin) | 2.8 | ? | 89 | Breezy, also lasers, and non-cracking | +| Cast Acrylic | 3.3 | 2.8 | 46 | Breezy, esp. w/ Lasers | +| 6061 ALU | 69 | 22 | 87 | Breezy with WJ, Painful on Shopbot | +| FR1/CE (Canvas / Phenolic) | 6 | ? | 81 | TBD, probably WJ Pain and Ease on SB | +| FR4/G10 (Fiberglass) | 22 | ? | 98 | Painful on a WJ, Slightly Easier on a Shopbot | ## The Blocks ### [N17 Linear and Pinion-Type Belt](gantries/n17_linearPinion/)  +### [N17 Linear and Pinion-Type Belt, Reduced](gantries/n17_heavyPinion/) + + ### [N17 Linear and Pulley-Type Belt](gantries/n17_linearPulley/)  diff --git a/beams/README.md b/beams/README.md index fbd49a0836b815a23e3a38190151f3182eaf5083..950f628ec12aa2e85064a58221a011a13fd470c8 100644 --- a/beams/README.md +++ b/beams/README.md @@ -2,6 +2,8 @@ Torsion ain't easy, as they say. In a break from a bonafide software extravaganza, I've been walking through this design for a decent beam from flat stock, to back on RCT Gantry types. + + The beam design is straightforward, but I've also been occupied with joinery. A big driver here is the desire to make machines with laser cutters and acrylic, to really lower the threshold for fab-your-own-machine-ing. To that end, joints in acrylic that don't cause cracking has been the order. Typically, laser cut acrylic members are joined a-la this classic machinescrew-and-captured-nut joint: diff --git a/beams/images/acrylicbeam.jpg b/beams/images/acrylicbeam.jpg new file mode 100644 index 0000000000000000000000000000000000000000..062d0b003458e6d0bd1b14d24428de538217ca3a Binary files /dev/null and b/beams/images/acrylicbeam.jpg differ diff --git a/gantries/n17_heavyPinion/README.md b/gantries/n17_heavyPinion/README.md new file mode 100644 index 0000000000000000000000000000000000000000..0676a8a886735b0ac6d7b29f28b51dfa86b17b1e --- /dev/null +++ b/gantries/n17_heavyPinion/README.md @@ -0,0 +1,9 @@ +## Gantry for NEMA17 Motor, 0.25" Stock, Pinion-Type Belt with Reduction + +**STATUS:** looks and feels sound by first test, tbd on documentation + + + + + + diff --git a/gantries/n17_heavyPinion/n17-hp-01.jpg b/gantries/n17_heavyPinion/n17-hp-01.jpg new file mode 100644 index 0000000000000000000000000000000000000000..0bbe189682338bddd5bbb5f24c65428861afa025 Binary files /dev/null and b/gantries/n17_heavyPinion/n17-hp-01.jpg differ diff --git a/gantries/n17_heavyPinion/n17-hp-02.jpg b/gantries/n17_heavyPinion/n17-hp-02.jpg new file mode 100644 index 0000000000000000000000000000000000000000..d781ed4279e0b965abade5a292d41c033f99b819 Binary files /dev/null and b/gantries/n17_heavyPinion/n17-hp-02.jpg differ diff --git a/gantries/n17_heavyPinion/n17-hp-03.jpg b/gantries/n17_heavyPinion/n17-hp-03.jpg new file mode 100644 index 0000000000000000000000000000000000000000..63d7a36d3ae7c027d1f39586f75d0f8692646d00 Binary files /dev/null and b/gantries/n17_heavyPinion/n17-hp-03.jpg differ