Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Still to be designed:
Clearance retaining method for large bearings. Ernest recommended a simple screw from underneath.
Block/method to attach spring steel assembly to main aluminum plate.
Jig for fitting each puck with a collar of pulley stock in the same fashion (necessary for compliance tolerances)
Jig/plate/design for fitting timing belt with all pucks in correct orientations (necessary for ease of assembly)
Simpler cam-actuator connection with press-fit pin in cam and bearing fixed to actuator shaft.
Analyses to seize:
Tolerance of DUT placement as given in a .pdf from Ernest should have changes temperature extreme applied for worst case placement tolerance
L-10 bearing life calculations.
Many sets of bearings in place: (1) large puck bearings, (2) roller bearings for compliance, (3) bearings in cam and (4) pneumatic pivot block.
Fabrication: (see Goals for Next Week)
Puck assembly (0% complete)
Airpel assembly (45% complete)
Spring steel assembly (60% complete)
Accomplishments from Previous Week
Alex almost completed first set of aluminum Airpel mounting block, will finish Monday and send to Airpot to be returned fully assembled
Spring steel block machining hit its stride
custom block-stabilizing piece machined by Mark
Tai churned out 10 bearing-holding blocks
Stale orders resolved (Misumi low-head screws and StockDrive pulley stock got delayed; will be arriving ~ Tuesday)
Report draft completely reworked (Steven) with many sections wholly changed; some later sections (e.g.: testing) still empty; still Work In Progress.
Website given a new look (Sean) with Home and Reports pages looking spiffy; still very much Work In Progress.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Machine, machine, machine!
Aluminum base and pulley stock collars for pucks (Sean)
Stainless blocks for hard stops and plates for (Mike)
Airpel mounting blocks (Alex)
Spring steel block to hold bearings (Tai)
Sub-system assembly should start this week and continue into early next week
Puck assembly: (Sean, likely with others)
6/8 of large-section bearings arrived. Last 2 arriving Thursday/Friday (Mar. 7-8).
Pulley stock arriving Monday/Tuesday (Mar. 4-5).
Completed (x8) puck assemblies feasible by Friday/Saturday (Mar. 8-9)
Spring steel assembly: (Tai and Alex, likely with others)
Roller bearings arrived.
Dowel pins and blocks need machining.
Spring steel needs holes drilled.
Mounting block needs design/assembly
Completed (x8) spring steel assemblies feasible by Thursday or later (Mar. 7- )
Airpel assembly: (Alex, likely with others)
Housing for send-away Airpel almost complete.
Second set of blocks for Airpel guts soon to start.
Completed Airpel assembly feasible by Friday/Saturday (Mar. 8-9)
Hard stop and hard flange assemblies: (Mike, likely with others)
Hard stop blocks (x4) and hard flanges (x8) for pucks can start when steel block/sheet arrives Tuesday (Mar. 5)
Goal to have fully working plate by next Thursday so more people have reason to show up for the sponsor presentation.
Report, webpage, and poster continuing work:
Create poster, first draft (Steven) (Mar. 8)
Reformat analysis sections for report (Steven) (Mar. 9-10)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Sponsor meeting with Ernest on February, 28th:
Consider single block for mounting spring steel
Ideally use metric screws instead of 0-80
In order to machine quickly enough we stayed with 0-80
Great to have prototype built by Thursday Week 10 meeting at Delta. Let Ernest know if we have working prototype and more staff will likely attend presentation
Able to perform testing (Thermal and Cycle) on Delta Machines. Cycle requires less, will need to reserve MATRiX for Thermal testing
Look up L-10 bearing life to calculate expected cycles with given loads. This would be a good analysis to have in report if possible
Consider moving single bearing to CAM arm rather than double bearing set in CAM puck
Another Delta employee ran press fit bearing test and they binded. Advised to use .007 clearance for bearings using Locktite
Use Locktite on outer race of shaft bearing on CAM, not press fit
Look up press fit for Puck bearing, in range of .001 or .002
Ernest sent us .pdf with these specifications
Use jig or some constrained piece to apply puck offset. Possibly tapped holes for screw-in pins on plate
Use pins (hole and slot) for precision in hard stop mounting
Apply temperature extremes to DUT position tolerances
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Presentation could use exploded view of puck assembly, makes idea much clearer
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Risks and Areas of Concern
Machining is time consuming and we have many high precision parts
Resources or Information Required but not Available
Schedule
Describe upcoming milestone
Update Gantt chart.
Budget (list amount spent and amount remaining)
~$1950 spent (awaiting confirmation of shipping/tax amounts)
$33.15 on acrylic for Proof of Concept presentation prototype (Delivered)
~$742 Boca bearings (6/8 Delivered)
~$140 OnlineMetals plate and rod stock (Delivered)
~$45 McMaster on timing belts (Delivered)
~$150 Airpot on pneumatic actuators
~$70 StockDrive Products on Pulley stock (ordered, officially)
~$260 AST on small bearings (Delivered)
~$150 McMaster on screws, spring steel, dowel pins, retaining rings (Delivered)
~$150 Misumi on ultra low-head screws (ordered, officially)
~$30 OnlineMetals for stainless sheet/stainless block for hard flanges/stops (ordered)
~$100 McMaster on dowel pins, bearing spacer washers, 3mm reamer (ordered)
Remainder: $1550
Progress on Report and Webpage
Second drafts of report and webpage updated Friday night.
Report draft underwent total rebirth - Chapters 1 - 3 overhauled.
Webpage layouts of Home and Reports pages started.
Most descriptions accurate, but most pictures just placeholders for now.
Template modified. Page looks more official.