Physics laws update

Mar 11, 2010 4 Replies

In order to make my new feed mechanism work as intended and eliminate the over-run of the feed gears we took this path. I had the mechanism running at full speed to fit into the 240 ms window. It's much faster than that. So, by slowing it down, lightening the gears and installing drag brakes the feed is consistent and accurate and on time



One of my less wise choices for employees cleaned me out of all my Aluminum, Brass and Copper cut-offs and old fixtures. The only thing I could find for the drag brake pads was a 1" Copper rod. We first tried Nylon and that was a dismal failure but the Copper works well. I use brass brake pads on a lot of other things but Copper is a first. Is there any reason that it won't behave?


If it starts to transfer to the braked piece, it'll probably start to grab (at a guess).

It might drag less if it begins to work harden (another guess).

Dave

1 inch sounds about the correct size for a mini-bike, or older snowmobile brake puck. I would worry about the copper getting warm and transferring to the other surface and causing problems.

The brake pucks I'm referring to are available at most bike, or sled shops.

Copper transferring and picking up is certainly a potential problem, but it seems to be working for you. A tin bronze might be better. Maybe one of the porous / sintered bronzes used for bearings, which you can "top up" with oil?

That's what I use on bigger applications with 3" pucks on a 24" wheel.

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