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Low relief arches - Scalescenes Building Kits. - More Practical Help - Your Model Railway Club
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 Posted: Sun Mar 24th, 2013 12:01 pm
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GreenBoy
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Any one here built the low relief arches?

If you have can you hare any tips on how to cut out the arches accurately?

I am really struggling with making a half way decent job of this.

Any comments gratefully received.
Dave.



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 Posted: Sun Mar 24th, 2013 05:17 pm
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Spurno
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Hi Dave.Are we talking about the scalescenes ones?,if so i have just built over twenty of them in n gauge,they really are very good.As far as i can see there is only one way and that is with a stanley knife or scalpel which is how i done mine.It is a slow and laborius job but worth it.dress the cut edges with a felt pen or similar.you can see mine on my Ilsham Valley Railway thread in members layouts.I must add that i built the underarch businesses but it's the same kit with different infills.



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 Posted: Sun Mar 24th, 2013 10:03 pm
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GreenBoy
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Hi Alan.
Yes I am talking about the scalescenes low relief arches.
I am building in 00 gauge, and have approx 15-20 todo ( still working on the final plan, but given how slow I am at doing anything, I thought I would make a start....
Cutting the arches is slow, and my free hand skills are a bit shakey to say the least.
Slow it is....:???:

Thanks for your reply
Dave



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 Posted: Sun Mar 24th, 2013 11:34 pm
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Petermac
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Scalescenes kits are slow to build Dave. ;-)

I haven't done the arches but I've done a few others.  They take time and care to build a decent model but are well worth it in the end.  In any case, half the fun is in the building.

Regarding the arches themselves, depending on the type of card you're using, I've usually found that it's easier to cut just inside the line, in short straight cuts then carefully sand back to the line with glasspaper.  I'd agree that it's very difficult to make a good job of cutting an inside curve in anything other than very thin card. ;-)



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 Posted: Mon Mar 25th, 2013 01:15 am
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See if you can find a jam jar lid of the same diameter and us that as a guide?

I beleive that you can buy dividers with one end a point and the other end a craft knife blade too.



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 Posted: Mon Mar 25th, 2013 10:45 am
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Spurno
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Hi Dave,as Peter says these kits are slow to build,mine took me five weeks working three days a week due to work.i also mounted mine onto some plastic trunking for rigidity.one thing i quickly found out was not to be too fussy using a steel rule to cut out edges.i used scissors for speed,every cut will be covered by cappings or buttresses.this will speed the build up considerably.like Peter i also used glasspaper to smooth the arch edges and then used marker pen on the edges.this does make a difference.also change blades regularly,i did this and went from three cuts to one cut to go through.another thing i did was to mount the paper on old bonio boxes,it's about 1mm thick and perfectly adequate to buiild scalescenes kits.It's a lot cheaper,you're recycling at the same time and it keeps the dog happy.Do post some photo's when you can.



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 Posted: Mon Mar 25th, 2013 12:24 pm
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Bob K
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GreenBoy wrote: Any one here built the low relief arches?

If you have can you hare any tips on how to cut out the arches accurately?

I am really struggling with making a half way decent job of this.

Any comments gratefully received.
Dave.


Hi Dave

I think Reg (Sparky) used these on his layout, see Blossom Hill. You could send him a PM, I am sure he will tell you about the pros and cons.

Bob

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 Posted: Mon Mar 25th, 2013 05:07 pm
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Perry
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The 'compass cutter' that Marty refers to is a useful piece of kit. It's worth bearing in mind though, that they only cut true radii, not elliptical ones. Therefore, unless your arches are exactly parts of a true circle, a compass cutter won't be of any help.

If you have a large number of arches to cut out that are all the same size and shape, it might pay you to make a cutting template from a piece of aluminium sheet. Cut and file to exactly the shape you need, then use that to guide your knife blade, ensuring that you cut on the waste side, not the side you want to keep.

Therefore, your cutting template needs to be like this:



...and NOT like this:



I hope this helps.

Perry




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 Posted: Mon Mar 25th, 2013 05:30 pm
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col.stephens
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Dave, from experience I have found two ways of cutting curves.  Firstly, slowly and lightly draw your scalpel blade along the outline of the curve.  Take your time with this as the first cut is important to ensure you get the correct shape of the arch.  Then go back and do it again and the blade will follow the first cut.  Repeat this operation until you eventually cut through the card.  Clean up the edgers with the scalpel.  Secondly, if the arch is a true part-circle, hunt around your house, especially the kitchen to find a saucer, plate or something else which is round which exactly fits the circumfrence of the arch.  Now use the plate or whatever as a cutting guide, lining it up with the edge of the arch and gently run your scalpel blade around it until eventually cutting through the card.

Terry.

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 Posted: Mon Mar 25th, 2013 08:37 pm
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Petermac
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spurno wrote: ...................................................another thing i did was to mount the paper on old bonio boxes,it's about 1mm thick and perfectly adequate to buiild scalescenes kits.It's a lot cheaper,you're recycling at the same time and it keeps the dog happy.............................

And if you don't have a dog, they don't taste too bad anyway ..................:cheers



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 Posted: Mon Mar 25th, 2013 10:12 pm
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GreenBoy
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Hi guys - thanks for all the great comments

In parallel I emailed John Wiffen, and the following is his response

Thanks for your email. The arches are actually slightly elliptical (as per most real archwork) so I'm not sure that the circle cutter will work.

Here are a few tips though for cutting curves successfully:

- a large level cutting surface so you can rotate the job easily without obstruction.
- a sharp blade! snap off a new blade every few cuts.
- always work from 'inside' the curve (ie as though the blade is attached to a compass with you at the centre)
- try to cut the full length of the curve, stopping and starting will produce 'kinks'. If you do have to stop mid curve, when you restart always backtrack along the existing cut.


Sooooo, it's by hand taking it slowly and in one cut... And with the other hand, rub your tummy in a counter clockwise direction. :mrgreen:

All good stuff.

Oh, and to give you all a laugh - spent all Sunday doing my first set of arches, only to spill gravy all over them at dinner time. That will teach me to do my modelling on the dining room table, and not clearing away when asked! :roll:

Thanks again guys.
Dave



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 Posted: Tue Apr 9th, 2013 02:33 pm
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Campaman
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I have found that the easiest way to cut out arches like this is to run you new sharp blade lightly round the curve a couple of times not going too deep as recommended by Mr Wiffen.
 
I then cut the waste part of the arch into segments so that as I then go back to cutting the actual curve of the arch the segments drop away, in effect you are cutting the arch out by cutting smaller segments out, a quick rub round with sandpaper smooth's out any notches, but if you are careful with the cutting it wont need much.
 
I find by segmenting it you get more control of the blade and less drag.
 
 



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