Q: 60 watt charger on 15 inch macbook Pro

So there's a lot of discussion about this:

https://www.ifixit.com/Answers/View/1855/Definitive+answer+on+using+60w+or+85w+p ower+adapter+with+Macbook+Air

Of course Apple recommends the 85 Watt charger:

Find the right power adapter and cord for your Mac notebook - Apple Support

The standard answer in terms of general electronics practice is to use the charger that the MBP is designed for. Using a charger of a lower rating runs the risk of damaging the charger.

Here's another discussion:

http://apple.stackexchange.com/questions/71880/what-would-happen-if-i-use-a-macb ook-air-powersupply-with-a-15-macbook-pr…

So to me while it will probably work I always err on the side of caution, especially when we're talking about a very expensive piece of equipment. So I would bit the bullet and buy the right charger.

A 60w charger is 'safe' to use but not practical on a 15" MBP.  Charge times will be lengthened considerably and in the instances where a lot of power is required, the 60w charger will not be up to the task. 

Do yourself a favor and purchase a 85w charger.

Ciao.