cleanout and rename

README.md

-# Roller Milling
+# Roller Coaster Milled Machines
 
-Spent some time working this out on the whiteboard today, and threw together some rhino sketches.
+Scratch / Landing page for the roller-bearings and 2d-sheet-stock axis system.
 
-![mill](/images/rct-machine-00.jpg)
+With RCT, we break axis into individual kinematic elements - and roll those elements into machine designs. 
 
-![wb](/images/wb-01.jpg)
+![gantries](/images/one-two-three.gif)
 
-I'm going for simple, strong-enough, and easy to build. Using rollers and pulleys, or, just as easily, rack and pinion or leadscrew-type actuation.
+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)
 
-Next up, getting into fusion to get through the details, then fabbing one axis... designing a simple 3axis machine, and fabbing that.
-
-I pulled this off with a simple set of flat-milled parts - I was trying to work with the constraints present in the set of FREP and Milling tools in MODS, to see if we could finish end-to-end gantry generation and milling.
-
-The result is OK, it'll certainly do - there's a line to toe between being kinematically wicked and loosing complexity. This is a bit of a midpoint - all of the axis of constraint have 'tuneability' in that their preloads can be adjusted, but all are over-constrained. There's enough (lots) flex in HDPE that this will be OK. There's a version which (not actually existing yet) is dead simple and totally constrained, and a version which is *perfect* motion-wise.
-
-Overall, it's a bit bulky. There's some detailing left out before it is complete. But I think in terms of an all-arounder axis, this is pretty OK, and certainly OK for being millable from one sheet of HDPE (or alu, whatever).
-
-![one-mill](/images/rob_rct_one.jpg)
+![mill](/images/mpvm-v03.jpg)
 
 ## CAD
 
@@ -82,44 +74,42 @@ filling in
 
 ## Hardware Notes
 
-- needs more clearance on belt-side
-- belt tensioning?
- - when rounding corner, teeth must at some point disengage b/c different lengths
- - same size M3 tensioning
+### CAM
+ - write down settings from fusion, all is good for full cut but go to 12.7krpm
+ - do 1st pass at holes, screw down from there. no tabs then ... much happier joints 
+ - don't forget bushing in 3dp set 
 
-Motor Idlers / Topside Way Bearings mount on M5 SHCS with washers on *both sides* and washers used as bearing shims. Use 3DP bushing (or purchased?) in axel. Important for carrying some moment to plate.
+## Some Simulation
 
-Clearances here for pulley to be mounted / tensioned! Consider order of assembly, tensioning.
+It occured to me in class today (Rob Hart fabricated the below component!) that the two-bar flexure I had intended was acting much more like a one-link flexure. Whoops, all well. Still does its job. Here's an image of that in any case:
 
-M5 Nuts 93625A200
-M5 SHCS (length not selected) 91292A128
-M5 Washers 93475A240
+![onebar](/images/preload-sim.png)
 
-also uses long M3's for tuning, nuts, washers. Length to be selected.
+## ooooh
 
-### Egregious Errors
- - bottom rail extremely unhappy, should be smooth and sideways ways should be clear
+![milling](/images/milling.jpg)
 
-### Minor Errors
- - missed a few holes in CAM, double check! 
- - y block internal boxing has co-dependent assy 
- - bearing bushings not satisfactory
- - on double rollers, accomodate washer in between 
- - motor collar coule be +0.05mm in diameter 
- - need long M5 for motor -> bearing 
- - need bigger wall on captive nut for tuning 
- - need channel in side of motor collet for screw turning 
- - XZ situation has lots of unaddressed assembly issues 
- - add clamping features, hole access for final beam -> gantry assembly
- - have to watch where bolt heads, bolts are - should include those in kinematic units modules 
- - y gantries should include two rollers in xy space (machine space) constraints 
+# BOM
 
-## Some Simulation
+## Machine 
 
-It occured to me in class today (Rob Hart fabricated the below component!) that the two-bar flexure I had intended was acting much more like a one-link flexure. Whoops, all well. Still does its job. Here's an image of that in any case:
+ - GT2 9mm Belts and 20T 1/4" Bore Pulleys https://www.amazon.com/Aluminium-Timing-Belt-Pulley-2GT/dp/B01COI0FEQ/ 
 
-![onebar](/images/preload-sim.png)
+## Spindle
 
-## ooooh
+ER16-C12-L100 Collet Holder (confirm?)
+
+2x 6001-2RS Bearings (confirm?)
+
+GT2 Pulley 5mm Bore 20T
+GT2 Pulley 12mm Bore 40T
+GT2 Belt 75T 150L (confirm?)
+
+4x SHCS M3x10
+1x SHCS M3x20
+4x M3 Washer
+1x M3 Locknut
+3x FHCS M2.5x8
 
-![milling](/images/milling.jpg)
\ No newline at end of file
+3DP:
+ Parts!
\ No newline at end of file

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