1″ Minnie Traction Engine

This topic has 10 replies, 4 voices, and was last updated 28 June 2026 at 18:48 by JasonB.

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28 June 2026 at 09:40 #853799
Geoff the bloke
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@milburyringbtinternet-com
I have just purchased a casting for the cylinder of a 1″ Minnie. As there is not enough room for the fixings to the boiler I presume it fixes to the cylinder saddle first for which I have drawings. But how does it fit? Also what is the thickness of the cylinder saddle which does not seem to be shown on the drawings I have? Thanks

Geoff
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28 June 2026 at 10:11 #853811
JasonB
Moderator
@jasonb
There is machining allowance on ALL surfaces, by the time you have got them all down to size there is plenty of room for nut or bolts .

The saddle is an integral part of the casting so not sure what your castings actually are, can you post some photos. The saddle is dimensioned as 5/32″ thick but may come up a little less
28 June 2026 at 11:28 #853822
Dave Halford
Participant
@davehalford22513
Hi Geoff,

All the MAP sourced drawings and book show the integral saddle with dimensions.

There are some strange cylinder castings out there, I have one that looks more like a letter P that I got with the gears I wanted. however I have never seen one without the saddle.

Where did you get it from?

Just thought, didn’t we have a conversation on here this month about fixing the saddle separately to a boiler? Found it – not very helpful after all.
28 June 2026 at 13:05 #853837
JasonB
Moderator
@jasonb
If it is a separate casting then firstly ask the supplier if they have a revised drawing.

If that fails then you have two options.

1. Cap head screws up from below with counterbored holes in the underside of the saddle

2. Just silver silder the two together and treat as one.

3 if the castings are not that good and as all surfaces will need machining, start with a block of metal and replicate the single casting with integral saddle.
28 June 2026 at 16:35 #853882
Geoff the bloke
Participant
@milburyringbtinternet-com
Hi Folks,

Thanks for all the replies I will complete the preparation of the cylinder and then check all the dimensions. In the meantime I attach 3 photos which prompted my query:

Geoff

PS: Can’t seem to be able to attach photos – how do you do this? I have dragged it into my reply, it fills the screen but I then can’t get back to submit. Technology!
28 June 2026 at 16:53 #853889
Bizibilder
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@bizibilder
Using your email as your username is inviting unwanted spam!!! Ask the moderators/admin to allow you to change it.
28 June 2026 at 17:28 #853902
JasonB
Moderator
@jasonb
Click th elittle landscape icon along th etop of the reply box (far right) and then drag a JPG image into th ebox that appears.

You don’t need a moderator to allow you to change username, just go to your profile .
28 June 2026 at 17:50 #853908
Geoff the bloke
Participant
@milburyringbtinternet-com
Images attached:
28 June 2026 at 17:58 #853909
Geoff the bloke
Participant
@milburyringbtinternet-com
Hi,

I tried to change my username but just got this message:

Why can’t I change my username?
Once a username has been set this can’t be changed. If your username has been migrated over from our old forum (pre-September 2023) this may have changed due to incompatible characters on the new system.

Any suggestions?

Geoff
28 June 2026 at 18:41 #853910
JasonB
Moderator
@jasonb
Go further down and you can change the publicly displayed name which is the one directly under an avatar in blue. Not much that can be done with the black one at the bottom.
28 June 2026 at 18:48 #853913
JasonB
Moderator
@jasonb
There is usually a bit of material that can come off the vertical side faces below where the valve chest fits and under the curved side of the cylinder. That combined with getting rid of the fillets where the cylinder meets the saddl eshould give enouugh room for fixings.
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