Pfabrizi said:
I was also wondering because I make my own wooden swords and I like to make bigger swords so I wasn't really sure if practicing with them would affect technique or anything.
In my school's kobudo classes, we generally use "standard" bokken for drills, sometimes going bokken to bokken for contact drills as well. We'll also use the bamboo shinai for contact drills. I would strongly recommend starting out with the bamboo shinai, if you are going to be doing some sword on sword work.
I've seen too many people try to start their sword on sword drills with bokken. While bokken on bokken drills are fine, I would rather the participants have at least a certain amount of experience in handling them, so that they're familiar with proper techniques. This way, you don't have people banging up their fingers and hands (all too common esepcially when children are working these drills).
We do keep a few subrito (very wide, heavy, and large wooden swords) whose sole purpose are for strength training. Not really for sword on sword contact drills, since the swing would be different, and I'm not one to screw around with things that would disrupt good mechanics.
I see that you make your own wooden swords, and that's certainly admirable. I will, however, suggest that you be a bit picky when it comes to making your own bokken, especially when selecting the wood.
As a general rule of thumb:
Avoid North American red oak. Too porous, and breaks with any serious contact.
Avoid most white oak as well. See reasons above. Japanese white oak (Kashi) is good, though.
Hickory is a great bang / buck wood. Very tough and resilient, and doesn't cost as much as the more expensive exotic woods.
Purpleheart and Jatoba are great woods for bokken. Very beautiful woods, and also tough and resilient. I have a Jatoba bokken that has lasted me for two years of regular use. Sure, it has a bunch of indentations and a few surface cracks, but the bokken is still in great condition, and everyone who tries to use a red oak bokken against mine ends up for the worse.
Ipe is my favorite wood for bokken. Very, very dense, and extremely tough. The Ipe bokken that I have is a bit wider than my Jatoba bokken, but not by much. It has a lot more weight, though. Make sure you use carbide blades when you cut it...