Wednesday, February 22, 2017

2/22/2017

Hey, I haven't done much this week due to some complications on my computer, I was attempting to reinstall solidworks on my computer and am having a bit of difficulty with the licensing, therefore I started to redesign the brake within creo just so I could keep moving forward with the design of the brake.

Wednesday, February 8, 2017

2/8/2016

This is the first post of the new semester. For this reason I will overview what has happened over break.
Due to the initial decline of our BOM, we were asked as a group to look into finding a new motor that could possibly be provided from Lin Engineering or Oriental Motors. Our contact at Oriental motors no longer worked there and we were referred to a different contact without much of a headway for getting some motors donated. I then contacted Lin Engineering and Yaskawa to see if they would be able to provide stepper motors and controllers. Unfortunately, those two companies were unable to provide anything as well as Oriental, so I am at an indecision with propulsion.
As far as braking goes, I have looked through my personal stock of motors and found a suitable stepper to actuate the brake. I am still working to develop a small gear set for it to increase the torque and increase the force on the master cylinder that I will use to actuate the pistons in the brake calipers. Where the calipers will still have to be altered in order to fit around the rail.
Additionally, other work that I did over break was to waterjet out the main frame of the bogie before the waterjet at techshop went down. Making sure to get most of the pieces made before to make fabrication easier down the line.

Wednesday, December 7, 2016

12/7/2016

For this week, most of my time was spent cading new mounts for both the motor and the brake. the brake is now facing between the two bogie, where the most mounting space is available. The motor mount takes advantage of the pre existing bolt between the two bogies which are already used for the wheel bearings. The mount itself bolts together using 1/4-20 bolts and I am currently working to see the tear out failure for these bolts. Also, I 3d printed these mounts so they can be fixed to the pre-existing model that Michael had cut out.


I should also mention that the mount for the brake with going to be made out of 1inch tubing, using the same material as the bogie cross-members

Wednesday, November 30, 2016

11/30/16

I cannot say that I have been doing much for the project over the past few weeks. What I have been doing is thinking about how to mount a caliper large enough to clamp down on the rail from the bogie to act as a brake. Knowing that we are limited on fund, I ask some family about any parts that were available for making the braking system. As luck may have it, they can provide us with some calipers and master cylinders from older cars that can be used on the bogie. The downside is that there is no way to tell how large they are or what process will need to take place to make them work for the system. For that reason, only rough estimates can be made about the size and the orientation of these caliper parts until they can be acquired. Otherwise, the mounting of the motor need some reworking to be more effective given the limited space.
 3d printed models of the motor and the bevel gear have been made in order to have an object to compare with the bogie team’s rapid prototype. Providing a better idea of where the motor will ultimately be placed as well as where a caliper can be mounted without being in the way of other crucial components.

Although this is not easy to say. I am not sure what I can do about braking at the moment. I can pick up any parts that my dad can provide and use them in the system accordingly. Yet, the first chance that I will get to acquire those part will be over winter break, so the design for that may be held off until then. 

Wednesday, November 16, 2016

11/16/2016

For this week, not much can be said, I met with randy to further discuss braking options, and it is becoming increasingly clear that we are going to be limited on size. For the motor that I recently got a bid for, I am still working to figure out if it is capable of handling the back emf needed for engine braking as well as determining where it will become to hot from the process. In addition, I am working to fit a band brake to work with the motor in the bogie assembly, but tolerance is still an issue.
 In addition, I have rework the motor cad model to better resemble the new motor that I have chosen, I am still getting a few of the detail modeled and will apply it to the master cad model later this week. With the reworking of the motor, the mount, shaft, and gear will have to be alter to handle the different size for the output shaft of the motor,. The gears for replacement have already been selected of the McMaster Carr website and will be added to the bill of materials.

Wednesday, November 9, 2016

11/9/2016

This past week I have contacted a few companies with regards to acquiring a motor with the specifications that we need to move a 600lb pod-car assembly. Out of these companies, I got a response back from one, giving me a quote for the prices of two motors with the specifications that we need. Due to the change in motor, I am still working on updating a few things for the bogie design, placing that motor and gears along with it. Looking at the current design, it might be a more viable option to use motor braking compared to using a physical brake just to save space. We are still looking at brake designs and seeing if we can fit it in the main bogie, but not much can be said until then.

Wednesday, October 26, 2016

10/26/16

This week was spent more on cad than anything else, with the motor already selected, it was relatively easy to model the motor as well as a mounting bracket to attach it to attach it to the bogie as seen in the images below. In addition, a bevel gear, which was taken from a part supplier site, was mounted to the drive shaft of the motor and bogie, rotating the motion by 90 degrees. As fair as the brakes are concerned, we would have to go with something more compact than a disk brake to fit it onto the main axel. Even the smallest disk brake, which can be seen in the images below cannot fit into the tight space where the gears and motor are located. For this reason, we are looking at using a belt brake, which are typically used on pocket bikes due to their small form factor