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LBSC "Dot"

Working on the non mentioned topics

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John Penfold29/04/2018 06:44:28
23 forum posts
3 photos

I have at long last, progressed my LBSC Dot build to the missing build detail of running boards, cab dimensions and the loco - tender drawbar.

The narrative and plans of both the loco and the tender do not show a drawbar nor provide a clue of the fittings required.

Would someone be so kind as to give me a clue of what the drawbar looks like and how I may work out it's length and connections.

John Penfold29/04/2018 16:41:58
23 forum posts
3 photos

Oh dear - these bits must “unmentionables”

John

Weary29/04/2018 20:49:05
292 forum posts

Hello John,

As no-one else has attempted to assist you here are my thoughts ->

For the drawbar of "Dot" I think that you will find that a piece of 3/32" x 1/4" wide flat bar will do the job. It could be connected by 1/8" diameter pins at each end dropping centrally through the horizontal part of the respective drawbars. You can provide a lower support to the pin as well if you prefer by simply brazing in a short length of 1/2" wide by 3/32" thick flat centrally along the lower edge of each drawbar parallel to the upper surface and drilling through from above. You may need to laterally slightly 'waist' the middle portion of the drawbar to provide side clearance in the 1/2" wide drawbar slots. This depends on the minimum track curvature you intend your locomotive to pass.

Similarly I think that you will find the LBSC didn't specify a length of loco/tender drawbar as once again this depended on the minimum track curvature that the locomotive had to go round. I'm afraid that it is down to a bit of experimentation as to what is the shortest length allowing sensible clearance between locomotive and tender on the tightest curves and that still 'looks right'.

Regards & best of luck,

Phil

John Penfold30/04/2018 08:05:32
23 forum posts
3 photos

Thanks Phil.

I’ll work with this.

J

Weary30/04/2018 09:10:54
292 forum posts

A further thought:

You could make a box section drawbar by centrally brazing in a short section of the 1/2" 'L' material left over from the drawbar the opposite way round to the drawbar. I suggest this as an 'option' only as it may actually be easier to set this up and hold for brazing than a single piece of flat bar.

The drawbar itself can be any material that you might have available but obviously limited to 3/32" thick unless you open out the slots. The 1/4" width is the minimum, but again you can use anything suitable that you might have i.e. 3/32" x 5/8". If it is much wider than 1/4" it will almost certainly need 'waisting' between the securing pins - but that is hardly a big job.

I'm afraid that LBSC left these sort of details to the builder to sort out. Provided it works it is good!

Phil

John Penfold01/05/2018 08:46:48
23 forum posts
3 photos

Thanks again Phil.

I have had a GOOD look at the plans with my workbook close at hand. This is what I came up with. The bracket material looked the same thickness as the loco frame (1.6mm - 1/16". There wasn't any lower bracket for the drag-pin mentioned previously. With some head scratching, I measured out a piece of 1/16 and cut & bent into the shape shown in the red sketch on the part plan. When it is a bit further progressed - through trial and error as I am on the second cutting and bending - I will post a picture.

J

dragbeam detail 3.jpg

Weary01/05/2018 19:06:07
292 forum posts

Very nice elegant 'solution' to the drawbar pin lower bracket.

Regards,

Phil

John Penfold02/05/2018 07:31:09
23 forum posts
3 photos

Dragbeam bracket 2.jpegHere are the pictures.

Dragbeam bracket 1.jpeg

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