Bachmann Online Forum

Discussion Boards => Large => Topic started by: nhstone on February 05, 2023, 03:47:47 AM

Title: Bachmann 4-6-0 PNP chuff mechanism and adjustment
Post by: nhstone on February 05, 2023, 03:47:47 AM
I have been working on a new Bachmann 4-6-0 PNP loco #170.
Does anyone know how the chuff mechanism works and if it is adjustable, please?
I am familiar with the chuff mechanism in the Bachmann Anniversary locos.
Is this mechanism the same.

Thank you.

Nev Stone
Title: Re: Bachmann 4-6-0 PNP chuff mechanism and adjustment
Post by: StanAmes on February 05, 2023, 07:24:43 AM
Nev

The new 4-6-0 locomotive has an optical chuff that is on the first axle.

(https://live.staticflickr.com/65535/52670566373_cb52267b3c_z.jpg)

The optical sensor is interupted each time one of the twangs on the axle passes through.  This provided a chuff that in square.

At the socket the chuff pin goes to ground  for each chuff.

Hope that helps

Stan

Stan
Title: Re: Bachmann 4-6-0 PNP chuff mechanism and adjustment
Post by: nhstone on February 05, 2023, 09:40:06 AM
Thank you Stan.

Very much appreciated.

Nev