clickbait: Finished content, will need to fix probably.
This commit is contained in:
William Floyd
parent
c95041d34b
commit
cf579c4b21
GPG key ID:
B3EEEDD81893CAF9
1 changed files with 72 additions and 2 deletions
|
|
@ -44,9 +44,11 @@ The idea was fairly simple - use two smooth rods and a leadscrew to pull a carri
|
|||
The choice of this mechanism was, for the most part, due to availability of parts.
|
||||
I already owned the necessary rods and bearings, and springs were readily available.
|
||||
|
||||
***
|
||||
|
||||
|
||||
|
||||
Soon though, we had [some](/images/reduced/clickbait/20190919_213947.jpg) basic 3D printed parts in order - for it was 3D printing that was most accessible to us, and allowed largely unattended manufacturing while classes continued.
|
||||
Soon, we had [some](/images/reduced/clickbait/20190919_213947.jpg) basic 3D printed parts in order - for it was 3D printing that was most accessible to us, and allowed largely unattended manufacturing while classes continued.
|
||||
Despite this early start of progress, however, the ever present tendency toward procrastination crept in.
|
||||
The usual array of excuses were made by all, and little actual work was accomplished.
|
||||
|
||||
|
|
@ -66,4 +68,72 @@ As the shape of our ungainly creation began to emerge, it was clear progress nee
|
|||
Once we coupled our stepper motor to the leadscrew and power tested the unit, it was also clear that change was in order.
|
||||
|
||||
So a decision was made: a cheap cordless drill would be pilfered for a battery, motor and chuck.
|
||||
A H-Bridge would need to be bought (I [tried to](/images/reduced/clickbait/20191025_194859.jpg) [make one](/images/reduced/clickbait/20191102_144426.jpg))
|
||||
A H-Bridge would need to be bought for the drill motor (I [tried to](/images/reduced/clickbait/20191025_194859.jpg) [make one](/images/reduced/clickbait/20191102_144426.jpg), but the magic smoke was released...), and a latching system needed to be made.
|
||||
|
||||
***
|
||||
|
||||
|
||||
|
||||
The next week or so resulted in the beginnings of a working launch mechanism.
|
||||
With the aid of a rubber band, a latching track was put under the rods and springs, such that the motor would tension the launching carriage, then return to the front of the mechanism to allow the eventual release of the catch using a servo.
|
||||
Soon after this, the motor was [appropriately mounted to the frame](/images/reduced/clickbait/20191110_072012.jpg), with a carefully fit 3D printed socket.
|
||||
It was, it seemed, all coming together.
|
||||
|
||||
***
|
||||
|
||||
{{<youtube PWh-TsoAOK4>}}
|
||||
|
||||
Finally, some success came to us.
|
||||
A limit switch was mounted to the front of the device, and the motor was successfully power tested, along with the release of the launch mechanism.
|
||||
The end was near, or so it seemed.
|
||||
|
||||
***
|
||||
|
||||
|
||||
|
||||
Following soon after was the reel being mounted to the device also.
|
||||
Attempts were made to use a small DC motor, but with no luck.
|
||||
The lateral pressure of our motor acting through a belt meant friction was too much for our motor.
|
||||
Without time enough to reposition it, another solution had to be made.
|
||||
|
||||
Remaining at this point was a means of reeling in the line, a means of depressing the button on the rear of the reel, and the connecting electronics that would drive the entire contraption.
|
||||
|
||||
***
|
||||
|
||||
|
||||
|
||||
As it turned out, the very same stepper motor that had once tried to turn our leadscrew now instead would be pressed into service reeling in the line.
|
||||
Overkill, to be sure, and it's power most wastefully used, it did indeed reliably turn our reel, albeit slowly.
|
||||
The use of such a large pulley was a matter of making it fit the belt size that I had available.
|
||||
The next size down was too small, so the pulley had to be enlarged.
|
||||
This saved the most time 3D printed as compared to a smaller pulley with other parts changed.
|
||||
|
||||
***
|
||||
|
||||
|
||||
|
||||
Finally, the mechanics of the project were completed, with each component individually power tested, though not yet in tandem with one another.
|
||||
As all of this was coming about, I had also begun getting the electronics in order.
|
||||
By way of a multi-button garage door opener, and a 433MHz receiver, wireless control could be granted to an Arduino for little money.
|
||||
|
||||
{{<youtube TPhMx11LOok>}}
|
||||
|
||||
***
|
||||
|
||||
Finally, presentation day came.
|
||||
Not without some small failings, we presented, with acceptable results.
|
||||
The largest remaining issue was the fact that the leadscrew would slip the grasp of the chuck after several cycles of the machine.
|
||||
While we corrected by hand for the presentation (by re-chucking the leadscrew after each launch), we knew we needed to fit the slippage for good.
|
||||
After all, the final time-lapse of the project would not do with such continual, and blatant, hand-holding.
|
||||
|
||||
The solution, it turned out, was free: the end of the leadscrew was notched and tapered on a lathe, allowing the drill chuck to get a firm hold on the metal.
|
||||
With this solved, the final time-lapse was completed, and a collective sigh of relieve was given.
|
||||
|
||||
{{<youtube 4iX2adGqZVI>}}
|
||||
|
||||
***
|
||||
|
||||
Much was learned - how to more properly budget for a project, how to work with a team (something I need to improve on), and how to manage time well.
|
||||
All things considered, I found it to be a success - I did not pull an all-nighter for my own project, finishing with a few days to spare (no small thanks to an extended deadline), nor did I stress myself beyond all reason.
|
||||
Overall then, I enjoyed the experience of finally bringing a project to completion - this is something I do not often do, try as I might.
|
||||
The result, though useless for my own purposes, is something I am proud of, having taught me many things through it's completion.
|
||||
Loading…
Add table
Reference in a new issue