By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Hercules Steam Crane Tubal Cain

All Topics | Latest Posts

Search for:  in Thread Title in  
BOB BLACKSHAW16/01/2020 18:15:25
263 forum posts
59 photos

I am making the steam crane but going by the book of Tubal Cain, I am not using any castings just brass and what's about in the shed.

I cant understand the drawing in the book on the cylinder steam ports that connect to the standards.

The standards have four holes, drilled No 46 but cant understand how this fits to the cylinders,the drawings are sectioned drawn as two holes.

I'm obviously missing something here, any help please, I've made about 1/3 of it so far and hope to finish it.

Bob

JasonB16/01/2020 18:20:07
avatar
Moderator
17057 forum posts
1839 photos
1 articles

Can you post a photo or scan of the page as I doubt many have the book but may be able to work out what the drawing shows

JasonB16/01/2020 18:31:00
avatar
Moderator
17057 forum posts
1839 photos
1 articles

Just had a look at what it is like. The 4 holes in the standards are the usual two exhaust and two inlet holes you find on a double acting oscillating engine and there should also be a central pivot too. so the standard will look something like this

The cylinder will have a central pivot and two holes on the same diameter as the 4 in the standards and look like this

as the cylinder moves from one side to the other each end will alternately connect to inlet then exhaust. Like this

Edited By JasonB on 16/01/2020 18:34:00

Bill Chugg16/01/2020 18:40:06
979 forum posts
6 photos

Bob

I have made the double acting engine version and still have the book . Happy to photograph mine and forward if it helps. Just send a PM with your e-mail address

Bill

Maximiser16/01/2020 20:04:39
3 forum posts

There’s a brief explanation of how this type of engine works on page 14 of my copy of Tubal Cain’s book (Building Simple Model Steam Engines, 1997 reprint)(Chapter 2, Polly steam plant, introductory paragraphs).

Edited By Maximiser on 16/01/2020 20:05:54

BOB BLACKSHAW16/01/2020 20:05:38
263 forum posts
59 photos

Thanks Jason and Bill

Its so obvious looking at the photos and the word oscillating, I had it fixed in my head that the cylinders didn't move.

Looking forward to get it sorted tomorrow.

Bob

BOB BLACKSHAW16/01/2020 20:08:05
263 forum posts
59 photos

Thanks,Maximinster.

Bob

BOB BLACKSHAW27/01/2020 12:31:59
263 forum posts
59 photos

I am making the cylinders out of brass and about to put the steam ports in, I was thinking of putting two condensation taps on the two cylinders.

I have made a boiler and have tried it out on one of my stationary engines but had more hot water coming out of the exhaust as the cylinders were cold so I gave up on that. The boiler works well with a good amount of steam which incorporates a superheater.

I will make a boiler as shown on the steam crane drawings but have others that have made the crane had the problem of wet steam, and would two taps make much difference.

Bob

JasonB27/01/2020 16:09:10
avatar
Moderator
17057 forum posts
1839 photos
1 articles

As nobody else has replied I would say add the drain cocks as it is easy to do at this stage as they can only help with getting rid of any condensate in the cold cylinders when you first start the engine. Or if you don't want to spend out on a pair of cocks you could drill and tap for them and just make up a couple of plugs then see how things go, if you get a condensate problem then just swap the plugs for drains.

JC5427/01/2020 21:13:33
avatar
113 forum posts
6 photos

I would think that drain cocks would not be necessary on an oscillating engine. Surely the cylinder will lift off the standard allowing any condensate to escape? John

Bill Chugg27/01/2020 21:30:29
979 forum posts
6 photos

I do not have drain taps on mine and it has not been a problem apart from the dribbles on start up. I do not have drain taps on any of my oscillators to be honest I have never considered it.

Raises an interesting point that I do not know the answer to.

The crane engine can be built as single or double acting - mine is double acting.

So how many draincocks would be needed for a single and how many on a double please ?

I suspect Jason may well know the answer on this one.

Bill

Bill Chugg27/01/2020 21:30:57
979 forum posts
6 photos

Some pics of progress would be good please

Bill

Edited By 34046 on 27/01/2020 21:32:15

Bob Unitt 127/01/2020 21:45:00
81 forum posts
8 photos

I made one of these more years ago than I care to remember. I can't recall if the original boiler drawing specified it, but I piped my steam outlet down to the burner area and formed a loop of pipe to pass through the flame, gave me a bit of superheat. I also directed the exhaust into a glass screw-top jar fastened underneath the main platform,with an outlet through the screw-top - that kept most of the condensate in the jar, which i could unscrew and empty at the end of a run.

I was surprised at just how heavy a weight the crane could lift, given that the boiler red-lined at 30 psi, very impressive.

JasonB28/01/2020 06:57:32
avatar
Moderator
17057 forum posts
1839 photos
1 articles

Well if a single acting with open end to the cylinder then only one would be needed but you can get single acting ones where there is a cylinder cover that acts to guide the piston rod so any steam getting past the the piston that condenses will find it hard to get out as the passage is on the other side of the piston.

Regarding lifting off the port face again depends on the engine as not all have a simple spring, you can get ones that have a pivot on the opposite side to the ports with a screw adjuster that won't allow for any lift.

Drains can also be opened and steam allowed to flow through the cylinder which will warm it which will help reduce condensate on start up.

Bill Chugg28/01/2020 08:44:04
979 forum posts
6 photos

Thanks Jason

Having closely looked at mine I wonder if small enough drains are available that would look in keeping ?

Bob. I directed my exhaust straight back into firebox and up flue so heat would evaporate it.

I also fitted a valve so the engine speed could be controlled. Will try and upload a picture later.

Bill

BOB BLACKSHAW28/01/2020 09:44:58
263 forum posts
59 photos

dscn1164.jpgThanks for the replies, as stated the cylinders do look rather small and would look out of keeping for drains but worth some holes that can be plugged .

A slow progress picture that Bill asked for.

The large gear was slightly out of centre so I had to offset the bearings by .2 mm for it not to bind with the other gear, plus not as the drawing owing to what I could find in the shed.

Bob

JC5428/01/2020 09:51:14
avatar
113 forum posts
6 photos

Regards cylinder lifting off port face, I completely agree with you Jason about some oscillators not being able to lift off but after looking at the design for this engine/crane it can lift. It uses a spring to keep cylinder on portface. Whether you wish to add drain cocks or not is down to personal choice but Tubal Cain didn't appear to think them necessary. John

Bill Chugg28/01/2020 10:25:28
979 forum posts
6 photos

I give up. Do what I may I cannot upload tp my album, Everthing I click on comes up PAGE NOT FOUND - even on delete album.

Bob, Well impressed by your progress and work so fat, thanks for posting - the standards look much better than the Reeves castings.

Have sent you a PM and will send pictures of my set up of steam valve and exhaust into firebox on receipt of your e-mail address.

Bill

Bob Unitt 129/01/2020 08:39:11
81 forum posts
8 photos
Posted by 34046 on 28/01/2020 08:44:04:?

Bob. I directed my exhaust straight back into firebox and up flue so heat would evaporate it.

I tried that but it put the burner out surprise

Bill Chugg29/01/2020 10:37:14
979 forum posts
6 photos
Posted by Bob Unitt 1 on 29/01/2020 08:39:11:
Posted by 34046 on 28/01/2020 08:44:04:?

Bob. I directed my exhaust straight back into firebox and up flue so heat would evaporate it.

I tried that but it put the burner out surprise

That is interesting - just to clarify. The exhaust goes into firebox and then does a 90 so the tube is partly up the centre flue. I am also running on gas as opposed to meths, so the hotter flame so may be the reason why it burns it off ? Just a thought.

Bill

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
cowells
emcomachinetools
Warco
Eccentric July 5 2018
Allendale Electronics
ChesterUK
Ausee.com.au
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest