How to make a perfect box

[OM2]

I've made 2 boxes out of deck planks.
I'm pretty happy with the results.

I measured and made a rough line down the planks - pretty sure they weren't perfect 90 degrees.

I cut with a jigsaw.

The ends, I used screws.
No glue was harmed in the making of my boxes.

How can I make more perfect boxes?
How can I make my wood all be the exact same length?
How can I mark exactly 90 degrees and then cut perfectly?

Circular saw? Table saw?
I'd prefer not to get! Kids running around.
But if that's the only choice, then I guess I have no choice.

Anything else?
Thanks.

 

[bernardgreen]

A chop saw with mitre feature such as one of THESE

Many other supplies exist.....

For safety switch off the power when you are not by the machine.

 

[freddiemercurystwin]

I've made perfectly acceptable and accurate planters with just a good handsaw.

 

[foxhole]

Chop saw is easiest, using a stop to get consistent lengths.

 

[OM2]

Thanks guys.
Chop saw looks perfect.

I also looked up 'track saw'. Would a chop saw be better?

I've also seen videos using jigsaw cutting with a rail - you can buy a a Bosch saw station.
For the price... I might as well get a chop saw.

Chop saw vs standalone circular saw?
Any thoughts. Can you get standalones that fit into a mount and make into a chop saw?

Thanks.