reverse quadrant/throttle quadrant in 3/4"scale.

[squandt]

Hello all, I am looking for a print to build a reverse and throttle quadrant in 3/4" scale for my Little Engine 4-8-4 northern ,I have the booklet for building the engine from Little Engines, drawing is very hard to make out, it is small and hard to read. I am looking for one's that use cut stop's not screw type , an help would be great,I do have the LBSC shop technical publication book,the screw type is shown.I am greatfull to all that have helped me in my building.

[NP317]

Contact Jack Boderman.
He is building such devices for his 3.5' gauge steamer, and has been posting progress as it occurs.
RussN

[FKreider]

You could also pick up Kozo's A3 book and use that quadrant as a basis of design and modify to suit your needs.

[Greg_Lewis]

Something I think about regardless of scale is a safety issue with notched throttle quadrants. While it is prototypical, we have much less time to react than the 12-inch folks, and if you have to make a panic stop or shut off in a derailment, a notched quadrant requires that you find the release latch, small as it might be, get your fingers on it, release it and close the throttle.

I’d suggest either a quadrant without notches but for the closed position, or a saw-toothed notching, with the teeth such that they catch on opening but ratchet shut when closing. In either case, all you need to do to shut the throttle is to hit it with the back of your hand. No fumbling for a tiny release latch needed.

[NP317]

My full-sized steam locomotive engineering experience has been with notched throttles with the latch lever between the engineer and the throttle handle.
Emergency shut-offs are done simply by pushing forward on the latch lever which releases the lock and closes of the throttle.
A simple forward motion accomplishes both unlocking and closing.
There is no reason our models cannot replicate that action.
Food for thought.
RussN

[Greg_Lewis]

My full-sized steam locomotive engineering experience has been with notched throttles with the latch lever between the engineer and the throttle handle.
Emergency shut-offs are done simply by pushing forward on the latch lever which releases the lock and closes of the throttle.
A simple forward motion accomplishes both unlocking and closing.
There is no reason our models cannot replicate that action.
Food for thought.
RussN

Great idea! I need to be more observant!

[elm53]

Just tighten the gland packing a little so the throttle stays where you put it.

[Bill Shields]

However reaching the quadrant on a 3/4 loco can be a reach / stretch..since you are rarely sitting ON the tender.

you need to plan the quadrant and / or reach rod mechanism carefully.