It is currently 10 Aug 2020, 13:26

All times are UTC [ DST ]




Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: 5" gauge Craven 25 Ton
PostPosted: 23 May 2011, 23:22 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
Seeing David's gallery photo's of "my" crane, the Craven 25 ton at NRM, I thought it best send some piccies of my attempt.

I will dribble you a few piccie's once a week or so (don't want to get you too excited).

First off is the match truck or jib runner, made of wood and tied together with the correct tie rods, measuring 23.1/2" over the buffers.


Attachments:
Match wagon.jpg
Match wagon.jpg [ 90.59 KiB | Viewed 24436 times ]
match wagon 001.jpg
match wagon 001.jpg [ 87.95 KiB | Viewed 24436 times ]
match wagon 002.jpg
match wagon 002.jpg [ 107.83 KiB | Viewed 24436 times ]
match wagon 003.jpg
match wagon 003.jpg [ 103.32 KiB | Viewed 24436 times ]
match wagon 004.jpg
match wagon 004.jpg [ 99.3 KiB | Viewed 24436 times ]
Top
 Profile  
 
PostPosted: 09 Jun 2011, 17:10 
Offline
BDCA Member

Joined: 05 Jan 2011, 11:27
Posts: 31
John, The wagon is excellent!! really looks the part. you have to get some of the pictures of the crane on there.. the gear arrangement is fantastic!!


Top
 Profile  
 
PostPosted: 21 Jul 2011, 23:43 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
Hi, next off was the jib, well you do don't you. 5" wide and 29" long, used 8ft of brass angle and no, I didn't count the rivets. Actually, after a spat with the next door neighbour, 1/16 copper rivets were renamed "Angelas", It's surprising how much pleasure one can get by bashing Angelas on the head with a 1lb ball pein hammer!!


Attachments:
crane jib 1.jpg
crane jib 1.jpg [ 116.83 KiB | Viewed 24361 times ]
Top
 Profile  
 
PostPosted: 22 Jul 2011, 11:04 
Offline

Joined: 23 Dec 2010, 00:07
Posts: 339
Location: Poole, Dorset
John,

Stunning! Please keep the photos coming.

Roger.


Top
 Profile  
 
PostPosted: 26 Jul 2011, 23:53 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
Hi, more bits. Sheaves and center top, hoist brake disc. John
Attachment:
sheaves and brake disc.jpg
sheaves and brake disc.jpg [ 168.18 KiB | Viewed 24344 times ]


Top
 Profile  
 
PostPosted: 05 Aug 2011, 00:11 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
Hi, the biggest "gear" on the model. 8 3/4" dia. x 176 teeth plus the center pillar. It only just swung in the Myford gap. Having fallen foul of crane terminology, (see my intro), is it the "slew ring", or "base" ring, please let me know. There were some anxious moments as the last teeth were being cut in case I ended up with a half tooth!!! John


Attachments:
slew ring and pedestal.jpg
slew ring and pedestal.jpg [ 217.79 KiB | Viewed 24323 times ]
Top
 Profile  
 
PostPosted: 05 Aug 2011, 08:34 
Offline
Site Admin

Joined: 15 Dec 2010, 22:30
Posts: 281
Location: North Cambridgeshire, UK
John, that is impressive! But what else have we come to expect from you?

What in the way of machinery did you use to cut the gear teeth?
Presumably the gear and the pillar are separate components pressed or bonded together?

Please excuse any ignorance on my part as I'm not much of a machinist. [Though I do possess a gear tooth vernier... bought in a disposal sale several years ago simply because I liked the look and feel of it. :oops: ]

As to terminology, the gear you have made is the Slewing Ring. The Glossary on the main website describes this as "the large spur gear fixed to the carriage and used in conjunction with the Slewing Pinion to slew the superstructure".


Top
 Profile  
 
PostPosted: 09 Aug 2011, 00:21 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
The slewing ring is cast iron and the centrer pillar is mild steel and they are bolted together with 4 fitted bolts. The two photos show how some of the other components were machined in the miller. There are 19 spur gears and 18 bevel or mitre gears on the model, 2 dog clutches and 1 taper clutch. 5 of the larger spur gears have "H" section spokes which caused a bit of head scratching.


Attachments:
cutting a dog clutch.jpg
cutting a dog clutch.jpg [ 128.35 KiB | Viewed 24303 times ]
cutting a bevel gear.jpg
cutting a bevel gear.jpg [ 134.55 KiB | Viewed 24303 times ]
Top
 Profile  
 
PostPosted: 09 Aug 2011, 21:10 
Offline
BDCA Member

Joined: 05 Jan 2011, 11:27
Posts: 31
Now that is cool!, I am not looking forward to making the gears for mine!!


Top
 Profile  
 
PostPosted: 10 Aug 2011, 00:15 
Offline
BDCA Member

Joined: 07 Jan 2011, 17:55
Posts: 25
Hi Alex, easypeasy, but you will need a dividing head. The cutters I got from a second hand tool dealer at a model enginering exhibition. The Craven has two sizes of gear teeth, the ones for travelling are a larger tooth form than the crane gears. I have done both sizes but as the travelling gears are largely out of sight you could get away with the one size for all. Something to look forward to! John


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group