Author Topic: Bowman Loco Cylinders.  (Read 5384 times)

Offline Stilldrillin

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Bowman Loco Cylinders.
« on: July 05, 2010, 04:42:02 AM »
A German member of my other forum asked if anyone could help him...... He could only obtain metric tube, and needed imperial.....

Piece of bar, drill, ream, top od to size.......Course I can!  :thumbup:


I guess something got lost in translation........ He wanted cylinders!  :bugeye:


Here`s what he had just bought. A 193? Bowman loco.




Stripped......




He sent me a sample, from another loco......




Got off to a bad start, when the 3/8 tube I had ordered turned out to be 3/8 o/d instead! :bang:

Could find nothing, anywhere!  So, I appealed on here, and a kind Gentleman in America sent me the perfectly sized piece!

Thank you, Joe! (75Plus), yer a Gentleman!  :thumbup:


Parted to slightly over length..... Then made end plugs.




The bore is a couple of thou` over the original...... So, have to make a pair of pistons to suit......




Milled a 2" length of 5/8" dia brass, for the 1/2" wide cylinder blocks.




10mm ball end cutter + chamfer....... Looks ok!




Sawn in two & cleaned up. Then drilled holes & tapped 7BA pivot thread........




Made new pivot screws & nuts.......

Group photo........






Next job, soldering! Never liked doing that....... Would rather be machining.......   ::)

I made an aluminium pedestal support, plus a wooden handle to fit the bore.......




Tinned the bore and the cap. Then pressed & sweated them together......




Skimmed the ends to length.......




And drilled the 1.5mm holes.....




Screwed the block to a 7BA  aluminium support. Tinned the cylinder & block.

Then aligned them together with a 1.5mm drill shank, and re heated.....










After a good clean up, I think they came out ok!




Obligatory group photo.....




Oh, yes! In the pack with the samples was an SEL piston...... Could I make two of those, as well...... Pleese?










Note..... The top one`s still awaiting the big end rad machining......




Just received this pic from a very happy man......  :D




The loco will be rebuilt properly, during the winter months......  :thumbup:

David D
« Last Edit: July 05, 2010, 06:33:32 AM by Stilldrillin »
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline dsquire

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Re: Bowman Loco Cylinders.
« Reply #1 on: July 05, 2010, 04:52:33 AM »
David

Very well done and right nice of you to help out a fellow modeler. He should be well pleased with those bits. :ddb: :ddb:

Cheers  :beer:

Don
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'til your good is better,
and your better best

Offline Reckless_Engineer

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Re: Bowman Loco Cylinders.
« Reply #2 on: July 05, 2010, 06:46:55 AM »
Another cracking Job david :thumbup: How do you get time to do your own bits lol

Offline sbwhart

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Re: Bowman Loco Cylinders.
« Reply #3 on: July 05, 2010, 07:09:27 AM »
Nicely done and shown Dave.


Hope he makes a nice job of the rebuild to match your cylinders.

Stew
A little bit of clearance never got in the road
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Location:- Crewe Cheshire

Offline Brass_Machine

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Re: Bowman Loco Cylinders.
« Reply #4 on: July 05, 2010, 11:13:25 AM »
Very nice job David! Very professional looking.

Eric
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Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #5 on: July 07, 2010, 03:55:14 AM »
Thanks Chaps!

For all your positive comments......  :thumbup:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Rob.Wilson

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Re: Bowman Loco Cylinders.
« Reply #6 on: July 07, 2010, 10:31:46 AM »
Great thread David  :clap: :clap: :clap: :clap: :clap:

Your work must be all over the world now  :thumbup:


Rob

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #7 on: July 07, 2010, 12:40:08 PM »
Great thread David  :clap: :clap: :clap: :clap: :clap:

Your work must be all over the world now  :thumbup:


Rob

Thanks Rob!  :thumbup:

Funny you should say that! Off top of me head, Australia, New Zealand, Thailand, Austria, Germany, France, and all points of the Uk & Ireland.....

I`m re sleeving a Cyldon piston, at the mo. For Bournemouth! ..... But, next week, it`s America! :bugeye:   A "Miss America".... Pre war, steam powered speedboat....... No cylinder/ piston/ crank/ flywheel etc. But, another member in the UK has one, for sampling...... Probably!  :scratch:

Should be another interesting project!  :D

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Bowman

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Re: Bowman Loco Cylinders.
« Reply #8 on: May 04, 2021, 04:46:50 AM »
Hi I am new to this group and not sure if this is the way to contact you .After reading your excellent artical ,My question is on the Bowman cylinder is the pivot pin originally screwed or pressed in .I have bought two Bowman 300 and the pivot pin protrudes in to the cylinders damaging them. I will make new cylinders and solder them to the old bases.

Regards Peter

Offline millwright

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Re: Bowman Loco Cylinders.
« Reply #9 on: May 04, 2021, 02:32:50 PM »
Nice to see you are still on your feet and keeping busy Dave, and good to see you helping out :clap: :clap: :clap:

John

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #10 on: May 04, 2021, 03:01:52 PM »
Nice to see you are still on your feet and keeping busy Dave, and good to see you helping out :clap: :clap: :clap:

John
Thanks John.
 But.... Have you seen the date of this project? That was 11 years ago!!  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #11 on: May 04, 2021, 03:12:58 PM »
My question is on the Bowman cylinder is the pivot pin originally screwed or pressed in .I have bought two Bowman 300 and the pivot pin protrudes in to the cylinders damaging them. I will make new cylinders and solder them to the old bases.
Regards Peter

Hi Peter. Welcome to Modder.
 I'm pretty sure, I copied the original, and screwed the pivot pin into the cylinder base. The tapped hole in the base, was deeper than the pin's thread length. So, it couldn't do any damage.

Has someone replaced the pivot pin, with studding... ?  :scratch:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline millwright

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Re: Bowman Loco Cylinders.
« Reply #12 on: May 05, 2021, 02:38:49 PM »
 :doh: Cheers Dave, i was at the opticians yesterday, and yes i'm in need of new glasses.

John

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #13 on: May 05, 2021, 04:26:57 PM »
:doh: Cheers Dave, i was at the opticians yesterday, and yes i'm in need of new glasses.

John
Nice one John! But....

You think you've got trouble!
 I've just had cataract op, on my left eye. Marvellous job! Everything is clear and bright. Through the new lens.  :thumbup:
The right eye, is still short sighted, and a pale khaki colour.  :palm:

I'm having fun, with single lensed reading glasses.....  :scratch:

David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline millwright

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Re: Bowman Loco Cylinders.
« Reply #14 on: May 06, 2021, 02:52:49 PM »
I was told i have a cataract starting in the corner of my left eye!!!!!!!!  ehhh its a bugger this getting old. hope yours gets back to normal soon Dave.

John

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #15 on: May 06, 2021, 03:15:37 PM »
  ehhh its a bugger this getting old. hope yours gets back to normal soon Dave.
John
Thanks John. But,being this age, sure beats the alternative.....   :lol:

I had a phonecall today. An appointment, for pre-op, Monday. Should be all sorted within a couple of weeks...  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline awemawson

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Re: Bowman Loco Cylinders.
« Reply #16 on: May 06, 2021, 03:46:14 PM »
Good luck David with the procedure.
Andrew Mawson
East Sussex

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #17 on: May 06, 2021, 05:45:56 PM »
Thanks Andrew....
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

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Re: Bowman Loco Cylinders.
« Reply #18 on: May 07, 2021, 02:26:59 AM »
Morning Dave

Nice to here from you  :thumbup: :thumbup: :thumbup:

Stew
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline Stilldrillin

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Re: Bowman Loco Cylinders.
« Reply #19 on: May 07, 2021, 02:47:11 PM »
Hi Stew!
 Still around. Not very productive, at the moment.
Waiting for the weather to sort itself out. And, allow me to, "get out there", again....

Hope all is well, with you and your's.
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!