Re: OT: Repeatably lobbing "projectiles"

On 11/29/2024 5:33 AM, Jasen Betts wrote:

On 2024-11-26, Don Y <blockedofcourse@foo.invalid> wrote:

On 11/23/2024 6:20 PM, Don Y wrote:

What if I do this mechanism BACKWARDS?
>
I.e., use a spring in extension mode.  Let the "carriage" STRETCH
it to a desired length (storing energy).  HOLD the "free" end of
the spring in place ELECTROMAGNETICALLY (!).

>
THIS is the solution!  One can purchase electromagnets that can
hold 40+ pounds (some operating at up to 100 pounds) for ~$75 (QTY1)
and operate them from a 24V supply with << 1A.

 Or for the scrap value of a microwave oven transformer.

They make devices specifically designed to hold particular "weights"
so this eliminates that variable from the build.  They also come with
"striker plates" that are designed to ease repeatability in positioning.

This has got to be the easiest way to avoid the mechanical mess
that comes with other "launch" schemes!

 There will be magnetic friction as it lets go, but this should be
repeatable if the armature placement is repeatable,

Yes.  It also means I have more freedom over the exact mechanism
used for the "propulsion" as well as "tension"!

Maybe I can replace the spring with something else, at the same
time.  If the release/catch issue is out of the way the rest
should be easy!

 Some sort of "springboard" perhaps.

Any of the ideas presented is again, "fair game", as the release/catch
was the typical problem area.
Now, to figure out just how large (mass and size) I can go within the
constraints of the "catch"...