Can't install OSX 10.8 on USB

I have a lab full of Macs I need to install 10.8 on and I have decided to do it with a USB Drive. Whenever I try to install the image onto the drive I get the message: An error (60) occured while copying. (Operation timed out.)
I am using a 32Gb Kingston USB Thumb drive.
I did select the GUID option.
Any ideas?
Thanks

Try this free program - it will erase the drive.
Bootable Drive DVD or USB Flash Drive – Lion Diskmaker

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