There is some drag established in the tube, so drill several holes along the length, to let the air our. One of the NRTLs questioned us when using the tube without the holes, and then suggested putting them in.
You can also make the tube slightly longer, and then drill a hole through both sides at the top. Place a screwdriver or something similar through the holes, and rest the ball on top. You now have a simple release mechanism. James Goedderz Sensormatic > ---------- > From: Colgan, Chris[SMTP:chris.col...@tagmclarenaudio.com] > Reply To: Colgan, Chris > Sent: Thursday, November 18, 1999 6:00 AM > To: emc-p...@ieee.org > Subject: RE: impact /probes > > > Hi group > > Most of you experienced ball droppers probably already know this but for > those of you that are new to the game I thought I should share this handy > hint with you... > > Buy some ordinary drain pipe from your local hardware store and cut it to > length the same as the height you need to drop the ball to obtain the > required impact force. Place the pipe over the bit of the product you > need > to bash and drop away. > The advantages are: > > You don't need to remember or recalculate the height you need to drop the > ball > The height is "calibrated" > The ball doesn't roll behind the nearest filing cabinet > Your toes aren't subject to the test. > > This is how they perform the impact test at CSA Toronto > > PS - I made all my own probes out of plastic rod, old screw drivers, bolts > and bits of wood (and a coin probe out of coins!). CSA and NEMKO have > never > complained. > > Regards > > Chris Colgan > EMC & Safety > TAG McLaren Audio Ltd > > mailto:chris.col...@tagmclarenaudio.com > > > > -----Original Message----- > > From: Price, Ed [SMTP:ed.pr...@cubic.com] > > Sent: 17 November 1999 16:39 > > To: 'Rich Nute'; rpick...@hypercom.com > > Cc: dwight.hunnic...@vina-tech.com; emc-p...@ieee.org > > Subject: RE: impact /probes > > > > > > I don't normally go around dropping steel balls on things, but if I > wanted > > to be a purist about it, I would hold the ball by an electromagnet, so I > > wouldn't have to alter the shape and mass of the ball by drilling or > > affixing an eyelet. It also sounds like more fun. > > > > Ed > > > > > > > :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):- > > ) > > Ed Price > > ed.pr...@cubic.com > > Electromagnetic Compatibility Lab > > Cubic Defense Systems > > San Diego, CA. USA > > 619-505-2780 (Voice) > > 619-505-1502 (Fax) > > Military & Avionics EMC Services Is Our Specialty > > Shake-Bake-Shock - Metrology - Reliability Analysis > > > :-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):- > > ) > > > > > -----Original Message----- > > > From: Rich Nute [SMTP:ri...@sdd.hp.com] > > > Sent: Tuesday, November 16, 1999 8:55 PM > > > To: rpick...@hypercom.com > > > Cc: dwight.hunnic...@vina-tech.com; emc-p...@ieee.org > > > Subject: Re: impact /probes > > > > > > > > > > > > > > > > BTW, you may find a 50mm diameter ball bearing, but will it weigh > > 500g > > > > +/-25g? And then you'l have to drill and tap it for an eyelet for > > the > > > > string. > > > > > > The impact ball spec was written around a 2-inch diameter > > > ball bearing. > > > > > > Drilling and tapping the ball bearing requires some sort > > > of arc-drilling equipment (because of the hardness of the > > > ball bearing). > > > > > > > > > Best regards, > > > Rich > > > > > > > > > > > > > --------- > > This message is coming from the emc-pstc discussion list. > > To cancel your subscription, send mail to majord...@ieee.org > > with the single line: "unsubscribe emc-pstc" (without the > > quotes). For help, send mail to ed.pr...@cubic.com, > > jim_bac...@monarch.com, ri...@sdd.hp.com, or > > roger.volgst...@compaq.com (the list administrators). > > > ===================================================== > Authorised on 11/18/99 at 11:01:38; code 37f48bf3EF969762. > The contents of this E-mail are confidential and for the exclusive use of > the intended recipient. > If you receive this E-mail in error, please delete it from your system > immediately and notify us either by E-mail, telephone or fax. You should > not copy, forward or otherwise disclose the content of the E-mail. > > TAG McLaren Audio Ltd, The Summit, 11 Latham Road > Huntingdon, Cambs, PE18 6ZU > Telephone : 01480 415600 (+44 1480 415600) > Facsimile : 01480 52159 (+44 1480 52159) > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
