* Stocks set to end the week lower
* Data on tap includes producer prices, consumer sentiment
* Futures down: Dow 2 pts, S&P 2.4 pts, Nasdaq 4.25 pts
NEW YORK, June 14 (Reuters) - U.S. stock index futures dipped on Friday, with Wall Street set to rack up a loss for the week, during which trading has been driven by investors' concerns that central bank stimulus programs will be reined in earlier than expected.
* Uncertainty over the path of monetary policy around the world has roiled markets in recent weeks and nerves were stretched further earlier in the week when the Bank of Japan decided to hold policy steady.
* The prospect that the accommodative stance of central banks - particularly the Federal Reserve - could be pulled bank sooner than expected has prompted traders to rethink this year's bets that have been built around that support. Stocks have fallen during three of the past four days, and heading into Friday's session, the S&P 500 is down 0.4 percent on the week.
* Attention is now focused on the Fed's policy-setting meeting next week. Investors will be looking for insight into the timing of the central bank's wind down of its $85 billion a month bond purchase plan.
* On the economic front on Friday, investors await data on producer prices, industrial production and consumer sentiment.
* S&P 500 futures fell 2.4 points but were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures was off 2 points, and Nasdaq 100 futures lost 4.25 points.
* Boeing Co is poised to launch a larger member of its 787 Dreamliner jetliner family to meet demand for long-haul travel within Asia and other long-haul routes, sources said.
* Smith & Wesson Holding Corp's shares could get a boost after the gun maker raised its outlook for the fourth quarter.
* Broadcast Music Inc (BMI), a songwriters' rights organization, is suing Pandora Media after the Internet radio company rejected a request to pay a higher license fee for playing songs across various devices.