[modeleng] Re: Winson 14XX
- From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sun, 31 Oct 2004 21:21:02 -0000
Hi Clif
Thought so. With the wheels clear of the track it is quite common to get a
knocking sound. In normal use, the weight of the loco is taken by the
axleboxes resting on the axles. However, with the wheels clear of the
track, the axles will be running on the underkeeps. This means that there
will be a clearance between the axle and the axlebox crown. Once on every
revolution, the axle lifts due to the thrust of the piston and produces the
knocking noise that you heard. I've seen/heard it many times with engines
running on air.
Regards
Ron
----- Original Message -----
From: "Clif Walker" <clif.gwr@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, October 31, 2004 5:35 PM
Subject: [modeleng] Re: Winson 14XX
> Hi,
> This is with the wheels wedged up into about running position
>
> Clif
> ----- Original Message -----
> From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, October 30, 2004 9:49 PM
> Subject: [modeleng] Re: Winson 14XX
>
>
>> Hi Clif
>>
>> Is this with the engine running on air, with the wheels clear of the
> rails?
>>
>> Regards
>> Ron Head
>>
>> ----- Original Message -----
>> From: "Clif Walker" <clif.gwr@xxxxxxxxxxxxxx>
>> To: <modeleng@xxxxxxxxxxxxx>
>> Sent: Saturday, October 30, 2004 10:29 PM
>> Subject: [modeleng] Winson 14XX
>>
>>
>> > Hi All,
>> > My Winson 14XX still has the ability to confound.
>> > Whilst sorting out it's steam tests and the blow from the valve gear
> there
>> > was always a "boink" whilst running.At first I thought it was a bigend
> and
>> > did find a bit of play in one.I fixed that but the knock was still
> there.I
>> > next checked the other big end,took up a minute bit of play in that but
>> > the boink still carried on.On checking again I found a bit of play in a
>> > little end,made a new pin for that but the noise still went on.
>> > Now at last I think that I have found it.
>> > Winsons design only seems to give about a total clearance of about 15
> thou
>> > for the piston at the end of the cylinders.This has the net result that
> if
>> > the assembly of the piston rod to the crosshead and con rod to the big
> end
>> > is 7 thou out at either end of the stroke,the piston hits the end
>> > cylinder covers.
>> > I think that even the momentum of the piston or it bit of play in the
>> > bearings would also allow it to do it.
>> > I suppose that when I was testing the chassis on air,because of the
> noise
>> > from my compressor I did not hear it.
>> >
>> > Modifications are again in hand.
>> > Oh boy,am I getting good at taking this loco to bits.
>> >
>> > Regards
>> >
>> > Clif
>> > MODEL ENGINEERING DISCUSSION LIST.
>> >
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