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Author Topic: Cruck Frame No 1
Ken Hume
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Posts: 430
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Post Re: Cruck Frame No 1
on: December 20, 2016, 09:18
Quote

After laying up the second sidewall posts for scribing to the cruck mantle [tie beam] and cruck foot it was noted that there is a small interference between the mortice of the principal rafter and sidewall post is present due to the mantle being only 7.5" deep.

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Care was taken not to damage the principal rafter tenon whilst cutting out the sidewall post mortice

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Ken Hume OWG

Ken Hume
Administrator
Posts: 430
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Post Re: Cruck Frame No 1
on: December 23, 2016, 15:25
Quote

When joining waney edge to waney edge timbers it is worth employing the double cutting method where joints are offered up for final scribing and fitting in situ.

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The 2nd sidewall post is 8" wide and cutting a similar length mortice would result in a significant reduction in relish on the end of the cruck mantle [tie beam] -

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- and so a short 2" barefaced shoulder has been cut to still provide support but reduce the possibility of breakout of grain on the end of the cruck mantle.

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Once the profiled housing and tenon ends have been recut then the joint slips together and fits perfectly.

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Ken Hume OWG

Ken Hume
Administrator
Posts: 430
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Post Re: Cruck Frame No 1
on: December 24, 2016, 09:01
Quote

In order to fit the top sidewall post tenon into its mortice it is necessary to reduce the post bottom -

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- and rough hew the post bottom taper -

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- to allow this post to be sufficiently pulled into position so that misalignment of the top tenon is greatly reduced.

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The step lap seat at the bottom of the cruck blade is cut first followed by -

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- the matching sidewall post seat. It is important to leave a "spring" cutting allowance to ensure a tight fit of the post top and bottom. Trial fitting of this joint can be achieved by pulling the two cruck blades together using a come-a-long. The rough wood elements left on the sidewall post bottom table taper are then gradually removed by hewing, paring with a wide chisel and finally by kerfing with the saw.

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Once there is a good match between the sidewall post tapered table and the side of the cruck blade the come-a-long can be removed to allow the joint to be pulled together.

Image

Ken Hume OWG

Ken Hume
Administrator
Posts: 430
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Post Re: Cruck Frame No 1
on: December 24, 2016, 09:28
Quote

By late afternoon the whole of cruck frame No 1 was pulled together ready for drilling and pegging and fitting 2nd fix window frame.

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The cruck frame will then be pulled towards the top of the framing floor to allow for cutting out the open cog mortices on the cruck feet. This will also help to create a bit more space towards the bottom end of the framing floor where the centre cruck will be laid out.

It is somewhat pleasing to being able to report completion of this cruck frame as this confirms that all of the joint designs together with layout & cutting techniques and assembly procedures have now been proven and thus progress rates on Cruck No 2 & 3 should improve.

Opportunities for regular volunteers to get involved still exist. In the first instance please contact :-

Ken Hume OWG

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