Responsible Engineers: Dave, Trevor, Abraheim, Adam
OverviewIssue:
Can't put a huge aluminum cylinder on the lathe.
Can't assume the cots cylinder is perfectly smooth/uniform... it will have some imperfections and be warped.
- How to smooth these out without the use of a lathe?
Tools:
- Engine Cylinder Hone
- Method of Use:
- removes a little material on inner tube
- put on drill
- Will it work on 6 inch metal cylinder.
- How to purchase?
- order online, replace sandpaper
- Method of Use:
Questions:
Problem:
Screw holes are not radially symmetric (run-out tolerance is too high)
Proposed Solutions:
Get inside circular (using cylinder hone)
Cylinder Hone:
[As seen on mscdirect ^]
Allows us to clamp chuck from inside of the cylinder when radially indexing (?)
Cylinder hone extension (allows us to reach deeper into the rocket): here
Find a way to make the outside circular, then radially index how we have been
Build a new tool to attach to drill?
Use homemade woodturner to slowly turn and sand the outside
- What does tool do?
- How to use tool? Will it work
?
Next Steps:
Order
...
cylinder hone online
...
Replace stones with 80 grit sandpaper.
Look at homemade turning tool
Research industry solutions
Ask around about any bigger lathes on campus
...
Max Height: 8 feetz
Big Cylinder:
6’’ Diameter
7’ height (upper end)
Small Cylinder:
4’’ Diameter
4’ height (upper end)
Tools:
Engine Cylinder Hone
Homemade wood turner
Resources:
https://www.sandvik.coromant.com/en-us/knowledge/drilling/radial-adjusted-drilling
https://www.keyence.com/ss/products/measure-sys/gd-and-t/type/run-out-tolerance.jsp
https://www.gdandtbasics.com/circularity/
Information:
Runout tolerance = Axis offset + Total circularity
(a.k.a. how much it wobbles and how far from a perfect circle it is)
Proposed solution online: Straight surface + diameter gauge?
...
Gameplan:
Circularize interior using an engine hone
- Attaches to a drill and rotates three spring loaded grindstones that remove more or less material based on their spring pressure.
Circularize exterior using an improvised lathe
- Attach cylinder to a motor after the interior has been circularized (friction fit with laser cut wood circle?)
- Attach other end to a bearing so it can rotate (also friction fit with laser cut wood circle?)
- Fix a piece of sandpaper at a set diameter and move it up and down the cylinder until the entire thing matches that diameter (check tolerance at multiple locations to reduce error).
Backup method: Use a centerless grinder (more work but potentially better results)
- Cylinder sits on a rest while a grinder is rotated next to it
- A second regulating wheel is moved in to apply pressure and rotates without slipping with the cylinder
[As seen on Wikipedia ^]