Here is a video tutorial on how to create a flint and sand generator. This is a machine I setup to create materials for industrial TNT for use in the Implosion Compressor. I will be doing more tutorials for the mod pack showing some of the machine setups I use in my Feed the Beast Let's Play so be sure to subscribe if you need some help or just want to see my perspective of the game. Hope this helps.
This is still working fine after 2 weeks.