Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Builds, Repairs, Show Your Machines! => Technical Tips, Builds, and Help => Topic started by: Grotto on July 07, 2024, 03:22:56 pm

Title: Re: Cranko parts
Post by: Grotto on July 19, 2024, 03:28:40 am

Yep, & I’m not sure how many of the parts are actual Cranko.

The filler plug on it (which I’ll replace with a safety valve) looks like it’s ME thread.

Runs really well.

Cheers

Title: Re: Cranko parts
Post by: Scorpion2nz on July 19, 2024, 03:19:08 am

Your red “ Cranko “
 It looks to be a “Auckland Model Engineers “
 Made from Cranko parts after Cranko closed down

Cheers
Dennis

Title: Re: Cranko parts
Post by: Grotto on July 18, 2024, 02:44:32 am

Found my other “Cranko” engine I was planning on using as a sample for the safety valve, but it doesn’t seem to have one?

Made something that should work, although spring may be a bit strong. Will test on air and adjust if required.

Title: Re: Cranko parts
Post by: Scorpion2nz on July 10, 2024, 05:51:24 pm

@Grotto

All Crank Safety valves are the same
Chimney tin is .5 mm thin

Cheers
Dennis

Title: Re: Cranko parts
Post by: Grotto on July 09, 2024, 05:07:48 pm

Thanks for the photo & info Dennis,


Chimney looks pretty basic. I’ve done much rolling of sheet metal so should be a good learn.

It looks like the sheet metal is quite thin, looks like about 1mm?

I was going to copy the design of a safety valve from another Cranko I've got, it looks about the same as ones I’ve seen in photos.

Cheers

Title: Re: Cranko parts
Post by: Jim on July 08, 2024, 12:14:35 am

Thanks Dennis  :)

Title: Re: Cranko parts
Post by: Scorpion2nz on July 08, 2024, 12:01:37 am

Been a while since we have seen you around

Back wheels are held on with a circle type C clip made from soft wire.
That sits in the groove in the axle
Safety Valve main thread is 1BA and spring retainer nut is 8BA
Chimney height is tube 62 mm
Flare has width of 27 mm
Depth of 5 mm
Chimney is made from flat tin which is rolled and spot welded to fit over the chimney cup on boiler
Flare is separate and soldered on about 2 - 3 mm down
 I can make all parts if you have any problems

Cheers
Dennis

[attach=1]

Title: Re: Cranko parts
Post by: Jim on July 07, 2024, 05:57:21 pm

Welcome to the forum, hopefully Dennis @Scorpion2nz can help you out with your Cranko.

Title: Cranko parts
Post by: Grotto on July 07, 2024, 03:22:56 pm

Hi there,

I've got an old Cranko roller which is missing a couple of bits which I’d like to make.

If anyone can let me know:
the measurements of the chimney (just need total height and height of flare)
The thread for the safety valve.
How the rear wheels are held on.

Thanks