Friday, November 12, 2004
While the last of the machined parts are being made, I've put together a list of the assembly tasks required. These are tasks that require some minor machine tasks like taping holes to receive screws and cutting standoffs to size. This is the list as it stands now. The numbered tasks correspond to the leaders in the attached drawings.
Mechanical assembly task list
1. Cut ankle ring gear x2
2. Drill & C/sink ring gear x6
3. Tap bottom ankle link for ring gear x6
4. Drill and ream ankle hinges for hinge pin x6 ---11/23/2004
5. Turn bottom outrigger post for ball end x2
6. Cut, Drill, Tap, top outrigger post for ball end x2
7. Make bearing washers from Teflon / nylon type mtl. x22
8. Turn shoulder balance posts for ball end x2
9. Turn hip spreader posts for ball end x2
10. Drill, ream for alignment pins x6
11. Cut neck standoffs x5
12. Cut neck motor standoff x1
13. Tap holes x22
14. Make neck motor / bearing connector
15. Make shoulder bearing posts x2
16. Drill, Tap, Mount leg motor ball end. x2
Machined parts not yet finnished are:
1. hip bracket
2. shoulder plate and mating tail plates
3. leg motor mounts
5. assembly parts mentioned above
Monday, November 01, 2004
Looks really good guys..... Keith, you really do have too much time
on your hands.
IronCAD posted the Knewt Model on their site this week. Thanks to Kevin Devol and IronCAD for the software upgrade.
Brian Dean of BDMicro also responded this week with a very through explanation of the "extended mode" feature of ServoMojo for getting the full 180deg rotation from the foot motors. The settings are made by setting a minimum and maximum position address for each servo. We'll be testing this feature this week.
Philip FitzSimons (who did a great demo of his 5Amp, 30Volt, servo controller at the AHRC October meeting this week "FADC-01") will be helping us look into making a larger heavier, more powerfull, version of Knewt in the near future. (at which time "Knewt" wont be an appropriate name, perhaps "Knossos") How many lbs. of lumbering metal do you think 250watts will carry?
The ankle hinge is under way. I bought polished steel pins some time back for the purpose. But when I got them out this week, they were pitted with rust. The container I put them in must have had something corrosive in it at some point in the past. I have alot of .092 music wire, and we're going to use that as the ankle hinge pin.
View a movie of the lego test jig in action here.