Build, Test, Document
Once the systems were designed, the building and testing of the lifting system were built and tested.
All Solidworks models and drawings can be found here. The model name assemy_new is the full model assembly, with all other parts needed to build this assembly.
Test Plans & Test Results
An up to date test plan can be found here.
The actuator test data can be found here.
Once the actuators arrived, testing began on making sure the loads that were going to be used could be handled. Some of the results and trends for the actuator testing are seen as follows:
The data and trends for the large actuator follow closely to this data, and can be seen in the testing document found here.
From this data, we know that since the time of extension or retraction does not very much with the load, and that it does vary with the voltage, we can use different voltages to match up the two actuators to the different speeds needed for each.
When the lifting system was being assembled, it was noticed that the large bottom actuator was larger than the model sent by Linak. This caused us to have to redesign the base of the chair by adding extensions that allowed for a larger actuator.
A few other changes were made to the back actuator system, and were implemented. There was a new model made to reflect this.
Once this new design was used to assemble the lifting system, the weight and tip testing was done.
After all the assembly and testing, we were able to compare our actual performance of the system versus the initial requirements.
After all of the assembly and testing, we learned plenty of lessons from the problems that were encountered in the process. This list can be found here