Overview of Status of Analysis, Design, Fabrication, Tests, etc.
FEMAP Analysis Errors need to be addressed with sponsor
The design of the structure is completed with the exception of the rung specifications as well as the method for securing the ratchet strap to the base
Two complete prototypes of the legs have been built
Tests have been conducted on the prototypes in order to observe whether they would satisfy the give functional and strength requirements outlined by our sponsors
The material specifications have been decided for the legs
While the materials for the legs are being shipped, we will design and outline the specifications for the hinges, rungs and base structure
Accomplishments from Previous Week
Fabricated a Single Slit Locking Collar with 1.125" bore size
Received order for 4 sections of the telescoping legs of two different wall thicknesses. (1/8" and 1/16")
Machined legs and assembled them to make two prototypes of different wall length
In order to test for slip between the legs, a total of 220 lbs was applied to the ends of the 1/8" tubes
In order to test for slip between the legs, a total of 210 lbs was applied to the ends of the 1/16" tubes
Used a hammer and hit the top of the tubes and around collar to test for slip
Conducted force tests for both the Single Slit Locking Collar and the Sanitation clamp to 220 lbs and 210 lbs respectively
Completed a FEMAP model with errors in the nodes. This model will be reviewed by the sponsors
Placed an order for a prototype locking collar and hinge from McMaster Carr.
Concluded that tubes with 1/16" wall thickness will meet the requirements outlines for the project and that the Aluminum Single Slit Locking Collar will meet the performance requirements.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Test the legs with the new collar from Mcmaster (Steven)
Place an order for the final materials for the aluminum tubing (Alex)
Place an order for all the clamps of each size (Alex)
Finish FEMAP model for the 1/16" wall thickness (David)
Find and contact a grinding shop to discuss prices and options for machining the legs (Kwan)
Test locktite and JB weld (Kwan)
Assign Roles for the report(Team)
Initial designs for rungs and base ratchet strap structure. (Team)
Purchase ratchet straps from home depot (David)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Anodizing is a good option to explore (Email, 4/15/13)
Purchase more parts online and off the shelf for reproducibility (In Person)
Finding a grind shop or machine shop is preferred to us doing the machining ourselves because they will need to use the same shop to machine the legs to the right sizes when they are trying to produce more units (In Person)
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Check if Anodizing is a feasible option (4/15)
Emailed Sponsors
Locktite Blue is cheaper and will go a long way (4/15)
Check for a grinding shop to machine the tubes that we have because they are too long for the mills. (Tom - 4/19)
Buy the clamps off the shelf if they are under $7 (Tom - 4/18)
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Fabrication advice for clamp (4/19)
Risks and Areas of Concern
Lubricant added to the legs will reduce the friction coefficient increasing the likelihood that the legs will slip when clamped
Machining each leg ourselves will take a large amount of time and this will decrease the possibility that our sponsor will reproduce our product in the future
The tubing that is order and received will not have all have the same inner and outer diameters creating inconsistent machining instructions for the grind shop
Stainless steel components will add to the weight
Resources or Information Required but not Available
Schedule
4/22/13 - Meet with Instructor
4/22/13-4/24/13 - Design and outline Rungs
4/24/13 - Place an order for tubes for final structure
4/26/13 - Pick up Material Order for collar and hinge
4/26/13 - Work with Mcmaster hinge and collar
4/26/13-4/27/13 - Place an order for the final clamps and the remaining hinges
4/27/13 - Meet with the sponsors
4/27/13 - Resolve errors in FEMAP Model
4/28/13 - Purchase Ratchet Straps and Ratchet Mechanism
Week 5 - Send the Tubes into the grind shop or machine shop
Budget (list amount spent and amount remaining)
Spent: $170
$130 (Tubing Prototypes)
$40 (Collar and hinge)
Remaining: $1330
Progress on Report and Webpage
Assignments for the report will be outlined this week so that progress may be made ahead of time