Jon, Several years ago, we contacted a ball-bearing company and told them what we needed regarding the weight and diameter. They had no problem providing a suitable ball. (It would not surprise me if this was the origin of the steel ball standard.) The cost was about $6 per ball.
Originally we modified one ball to attach a hook, but now we do most if not all of our tests with a vertical drop. Rotating the EUT so that the vertical side is horizontal and using a vertical drop test is equivalent to the swinging ball test, and more repeatable. For the ultimate in repeatability, obtain a piece of 2" ID PVC pipe just slightly longer than the required drop. Drill a hole through the pipe at the end to be designated the top to accommodate a screw driver shaft. The distance from this hole to the bottom of the pipe should match the height spec of the standard. Additional holes should also be drilled along the length of the pipe to prevent pressure build-up as the ball falls to the bottom of the pipe. The test goes something like this: Place the EUT on a suitable surface. Identify the area of the EUT surface where impact is desired. Place pipe vertically over (not in contact with) the target. Insert screwdriver in the correct hole at the top of the pipe. Place steel ball in the pipe, resting on the screw driver shaft. Withdraw the screwdriver and WHAM (bulls-eye every time). This is repeatable enough that you can hit your big toe (or even your little toe!) every time :-( Best regards, Don Umbdenstock Sensormatic > ---------- > From: Jon Jones[SMTP:jon.jo...@ascom.co.uk] > Reply To: Jon Jones > Sent: Monday, September 24, 2001 8:59 AM > To: Emc-Pstc (E-mail) > Subject: Steel ball for impact tests > > > > Can anyone detail a manufacturer / supplier who can supply the steel ball > for impact tests as per EN60950:2000 clause 4.2.5. (50mm diameter, 500g) > > Thanks in advance, > > > Jon Jones > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: pstc_ad...@garretson.org > Dave Heald davehe...@mediaone.net > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
