Commit 97625060 authored by Jake Read's avatar Jake Read

update BOM and drawing for fab class

parent 1a42900f
**.3dmbak
**.rhl
\ No newline at end of file
**.rhl
**drawing/
\ No newline at end of file
......@@ -4,29 +4,34 @@
**USED IN:** [Little Rascal](http://gitlab.cba.mit.edu/jakeread/littlerascal)
![parts](n17_linearPinion_partsCallout.jpg)
![explain](n17_linearPinion_explainer.jpg)
![n17sofar](n17-assem.jpg)
Smaller Gantries. Uses 45* bearings in 3DP blocks, with one set riding on flexures for smooth preloaded motion. Cut aluminum or steel rail on WJ with high cut quality, or cut acrylic on laser. 0.25" or similar (6.35mm) stock assumed.
### Development Notes ...
- while heat-setting M4 inserts in for the rollers, (1) there isn't *really* enough space to get the soldering iron in (without melting the adjacent pla) and (2) it's difficult to guarantee these go in straight. maybe use a press-in insert? / a hex nut ?
- long runs (beams) are not stiff ... try 1/8" waterjet stiffening folded members
- in the fullness of time, add an N23 size for torque-y applications like the CAT's bed: this is minimal overhead.
**shoulder bolts can be substituted for fabricated bushings**
s/o to Rahul in Kerala for this example:
![bushings](shoulder-alternative.jpg)
### BOM for N17
Type | Size | QTY | Where Used | Vendor | PN
--- | --- | --- | --- | --- | ---
Flat Head Thread-Forming | No. 6, 1/2" | 12 | - | McMaster | 95893A255
Flat Head Thread-Forming | No. 6, 3/4" | 8 | - | McMaster | 95893A258
Bearing Shims | 5x10x0.5mm | 22 | - | McMaster | 98089A331
Flat Head Thread-Forming | No. 6, 1/2" | 20 | Most Plastic Fasteners | McMaster | 95893A255
Bearing Shims | 5x10x0.5mm | 22 | Adjacent Every Bearing | McMaster | 98089A331
Shoulder Bolts | 5x10xM4 | 2 | Pulleys | McMaster | 92981A030
Shoulder Bolts | 5x6xM4 | 8 | Rollers | McMaster | 92981A146
Heat-Set M4 Tapered Inserts | M4 | 10 | - | McMaster | 94180A351
Heat-Set M3 Tapered Insert | M3 | 5 | - | McMaster | 94180A331
Heat-Set M4 Tapered Inserts | M4 | 10 | Anchors for Sholder Bolts into Plastic Parts | McMaster | 94180A351
Heat-Set M3 Tapered Insert | M3 | 3 | Threads for M3 Screws to Adjust Motor Tension and Bearing Preload | McMaster | 94180A331
M3 SHCS | 10mm Long | 4 | Motor Mounting | McMaster | 91292A113
M3 SHCS | 14mm Long | 5 | Tensioning and Tuning | McMaster | 91292A027
M3 Washers | - | 9 | Screws without Washers are Sad Screws | McMaster | 93475A210
M3 SHCS | 14mm Long | 2 | Bearing Preloading | McMaster | 91292A027
M3 SHCS | 20mm Long | 1 | Tensioning Pulley | McMaster | 91292A027
M3 Washers | - | 7 | Screws without Washers are Sad Screws | McMaster | 93475A210
M4 SHCS | 20mm Long | 4 | Belt Mounting | McMaster | 91292A121
M4 Washers | - | 4 | ibid | McMaster | 93475A230
625ZZ Bearings | 5x16x5mm | 12 | - | VXB | [link](https://www.vxb.com/20-625ZZ-Shielded-5mm-Bore-Diameter-Miniature-p/625zz20.htm) or McMaster 6153K113
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment