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Tilzs:
Go buy one of those alum Fences from Home Depot. Make sure you measure twice and use a square to make sure it's square before you cut. You also need some clamps to make sure it's not going to move on you when you cut. You'll get really straight cuts useing that and a circle saw.

Edgedamage:
Get one of these:
Straightedge Tool Guide
This clamp is a 5/8" thick anodized aluminum channel with a full-length tensioning rod built in. You place the clamp on your work, slide the tailpiece along until it is snug, and then flip the cam to lock the channel in position.
The cam has two pressure positions and the tailpiece has a side-squeeze release. Jaws are 1/2" high by 1-1/2" wide.

Useful as a clamp, it is invaluable as a tool guide since the low profile lets a router or hand-held circular saw pass by unimpeded. It can even be used as a fence when needed.

hyiu:
Edgedamage tool is very good...

I use a cheap version...

I went to HD to buy a 4 ft metal ruler.... (a nice straight thick one..., not a wimpy skinny one....)

then with like 2 spring clamps... I can clamp the ruler on the wood... and use that as a guide for the saw....

from that, you should be able to use jigsaw for quite straight cuts.....

remember..... buy a pack of new, good blades for the jigsaw....

install the blade.... (and wear all your safety googles... etc)...
and then start your blade for a couple of seconds....

watch that blade pumps up and down.... the blade should be VERY steadily going up and down... no sideway motion....
(or else... your saw is bad....)

and when you cut..... go high rev... but don't push your blade too hard.... cut slow.....

you should be able to do good cuts....

now... there's something else to watch out for if you're using jigsaw.... you might screw up a cut if that cut is too close to the edge of the wood..... because as you are cutting, the piece that is close to the edge will start sinking as you're finishing the cut, and the saw will be at an angle... (making the blade also cutting at an angle...) and that will ruin your cut...

for those near the edge cut.... a circular saw is a better choice....

hope it helps...  ;) ;D

xcalibur:
We used the factory side of a piece of scrap MDF, full length. We clamped it down with a couple of quick clamps, the kind with the squeeze handle. No problems getting long or short straight cuts.

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