Correct size of holes to drill for wood screws in MDF?

[Iori]

What is the correct size of holes to drill into MDF?  I have some things glued together and am now ready to sturdy them up...    I the pieces are all 3/4" MDF and I plan on using some #6 and #8 screws, any help appreciated.  I am a total newbie on working with wood, but having alot of fun!  Thanks...

[Minwah]

I don't know if there is an exact size, but here's what I do (note: I am a total novice too, but this works for me):

Compare your drill bits to the screw in hand - pick the bit which is slightly smaller than the main body of the screw (ie not inc. thread).  Have a couple of practices on some scrap wood if you are in any doubt.  If you use a bit too small, the screw can be very hard to drive in.  Of course a bit too big could comprimise the holding of the screw.

[Iori]

Yea giving it a try on a bit of scrap is probably the best way to do it...  would hate to mess something up at this point!  

Hard to believe that you are a newbie too Minwah!  I guess you have mostly just messed with the software end of MAME up until now then...  MAMEWAH is the best front end, thanks for all your great work on it!  

[Minwah]

Hard to believe that you are a newbie too Minwah!  I guess you have mostly just messed with the software end of MAME up until now then...  MAMEWAH is the best front end, thanks for all your great work on it!  

Yeah I kept 'designing' (aka putting off) building my cab for months (ok years), lol!  Never been much of a carpenter...have a look at my cab as it stands, all the woodwork just about done - looking forward to getting final painting out the way so I can get to the fun stuff (electrics & control panels)  

[Iori]

Me neither though I am having alot of fun pretending I know something about carpentry and it has worked out ok so far.   Got the reinforcing done tonight...  

Your cab is looking great!