While a few faxes may be harmless enough, faxing can be an expensive proposition. Not only that, but a customer could be trying to fax something to you and getting a busy signal during one of Bob's "harmless faxes." Because Bob is also using this equipment during working time, you are experiencing a loss of productivity. You may also be sending a message to other employees that personal use of equipment during work time is OK. Is this the message you want to send? You may want to ask Bob to call in those take out orders and lay off the radio requests.