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Elliptical window mouldings

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Elliptical window mouldings

Postby RogerS » 04 Feb 2018, 11:05

Hi guys

Just wondering how you'd go about making these elliptical mouldings in the top windows? I'm guessing that they are plant-ons. Or buy them in from somewhere but where ?

Image

Also interested in how you'd approach the cornicing. It has rather a large cross-section which almost certainly needs to be assembled from smaller pieces, I think.

Buy-in ? Spindle mould it...some very large curves though meaning very large cutters or multiple passes then sanding where the cuts overlap ? Need about 25 linear metres.
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Re: Elliptical window mouldings

Postby Malc2098 » 04 Feb 2018, 11:21

I used to live opposite a retired engineer who made mouldings like that for the firms that maintained the old Georgian buildings in the town.

The cross section would often be hollow behind, so that the moulding was made out of one, two or several pieces of thiner wood, joined together.

He would make his own one-use cutters for his spindle moulder out of mild steel and run the timber through. I would sometimes have to be at the other end receiving the feed for him.
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Re: Elliptical window mouldings

Postby Malc2098 » 04 Feb 2018, 11:24

dbpsnewssp98b.jpg
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As a sort of example, this one is 10 plus inches wide. In the absence of board that wide, it would be made up of two or three mouldings joined together.
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Re: Elliptical window mouldings

Postby RogerS » 04 Feb 2018, 11:52

Many thanks, Malc. A very pragmatic approach. In the meantime I have found a company that makes...shhhh...don't tell the chaps...glass fibre cornice mouldings
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Re: Elliptical window mouldings

Postby Malc2098 » 04 Feb 2018, 12:02

RogerS wrote:Many thanks, Malc. A very pragmatic approach. In the meantime I have found a company that makes...shhhh...don't tell the chaps...glass fibre cornice mouldings



I heard that, pardon!
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Re: Elliptical window mouldings

Postby RogerS » 11 Feb 2018, 19:58

And just seen the price of them :o LOML quite likes this one as it's simple and takes cognisance of the ellipticals. But to buy it in will be £1500 :shock: Maybe even more...not sure if VAT is included.

But looking at the size...height 165mm and projection 200mm...
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Re: Elliptical window mouldings

Postby RogerS » 11 Feb 2018, 21:56

Just done a quick SketchUp drawing to see the size of the timber needed to make this and it's 65mm x 300mm. No way I'm going to be able to handle that with multiple passes through the spindle moulder.

:eusa-think:
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Re: Elliptical window mouldings

Postby Malc2098 » 11 Feb 2018, 22:03

Hmmm. That's why the glassfibre company are in business!
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Re: Elliptical window mouldings

Postby Robert » 11 Feb 2018, 23:43

The ovals sound like a job for a CNC. Programming an ellipse is not difficult as it is a circle with a scale factor applied to one axis. Back when I was punching metal I made them occasionally. Not sure what material would be up to the weather in this case though.

Never tried it but could you make a mould then use a casting resin?
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Re: Elliptical window mouldings

Postby fiveeyes » 13 Feb 2018, 01:51

If they are to be painted, perhaps a lamination would work for you.build a former of MDF, make 2 or 3 at a time.
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Re: Elliptical window mouldings

Postby droogs » 24 Mar 2018, 11:04

Roger, what you need is to make an Archemides Trammel, which allows you to then attach a router and create the mouldings. quick vid here:
https://www.youtube.com/watch?v=cI-QSlBqfME
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Re: Elliptical window mouldings

Postby RogerS » 24 Mar 2018, 12:29

Welcome to the forum Droogs

..and thanks guys for all your suggestions but seeing as how I need around 70+ I have decided to bottle out and get them made up elsewhere.

One good thing up here is that the timber is very well priced and excellent quality. £365 + V for a cube of unsorted 9 x 2 and seeing as how we're closer to Scandinavia (where a lot of the timber comes from) than most of you other guys, we can pick out the choicest bits before sending the rest down to you :lol:
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