mr rusty":12xp53ac said:This one https://www.screwfix.com/p/titan-ttb579 ... 230v/15774
As a planer it's pretty c**p, but I extended the thicknesser bed by bolting in a length of 18mm ply, removed the stupid plastic chip deflector and disabled the safety interlock (!!!), then made a plywood guard so the chips could just spit out - it makes loads and I didn't have a vacuum capable of handling the chip output!!
However, it has now processed a grand and half's worth of accoya into nicely PAR stock without changing a belt or blade.
I'd make your window in one piece. The largest sash window I have just made is around 2m H x 1.2m W
Having said all that, making a decent window takes planning. If you are using DG units, you also need to be thinking about draught seals, which are easily bought, but require planning in your sections. (no point having DG if your casements have gaps!) Similarly, how will you install DG units? I used dry glazing clips from reddiseals, and internal beads - everything is available, but much of the challenge is drawing up your sections. How will you machine them? It'll be a challenge IMHO without a router table, but certainly do-able, even with hand tools if you take your time. (but having just made a house full of windows, even with a domino for joints, decent router table, all the cutters for slotting out for seals, scribed joints etc, it's a work-out!)
For one window that is going to comply with building regs, the tools and/or time required are not insignificant. You need to work to quite tight tolerances. Anally I attempted to work to 0.2mm, and can fairly honestly say I achieved +/- 0.5mm in all my dimensions. (there is a certain satisfaction when you lay the laser measure over a large window frame, and get the same measurements top/bottom side/side to the mm)
But, if you can do it, you can make something as good or better than commercial products, and to a style and dimension as you want it!
With regard to douglas fir, the shrinkage when drying is quite high http://www.wood-database.com/douglas-fir/ which means that unless what you buy is fully seasoned and dry, it may move about a fair bit if it continues to dry, and/or is allowed to become wet again. Compare that to the shrinkage % of accoya between wet and dried https://www.accoya.com/wp-content/uploa ... N_2016.pdf and you see why accoya is such a good choice for doors and windows.
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