Posted By Graeme Main Ladies and Gentlemen I have 3 questions re the above and would be grateful for your opinions. It has come to my attention that one of our timber departments are looking purchase a set of twin chipper/cutting blades ( 8” ) complete with spacer ( to keep blades apart ) for cutting groves/slots in timber, this blade set up is used on a cross-cut saw. The supplier has stated that they must sell the above with a disclaimer because of the safety issues involved when using Dado sets ( twin chipper/cutting blades) it has nothing to do with dado rail, on machines fitted with electromagnetic braking systems on the grounds that the stopping system may course the blade retaining nut to come loose (according to there suppliers the manufacturers). 1.Would the issue of the blade becoming loose not be the same for saw blades on all systems fitted with electromagnetic braking systems or is it just because it twin bladed. 2.Can you really sign away your responsibility on the ground health and safety with a disclaimer. 3.Would you consider a second locking nut and a split pin put through a hole drilled in the shaft suitable additional safety measures. Kind regard and many thanks for any advice/comments. Graeme.

Posted By Neil R No, if you have legal duties then you have legal duties so you can not get round it with a disclaimer. You can have a disclaimer for if the equipment is not used for its intended purpose or if it has been tampered with etc. But standard supplier responsibilities still apply regardless of how many disclaimers they send you.

Posted By Casanova The direction of the thread takes account of the rotation of the motor takes account of the workpiece stop takes account of the tooth direction.

Posted By Graeme Main Many thanks for the responses both on the forum and those that replied direct. Regards Graeme

Posted By Roly Buss The short answer is don't do it. Using a dado set is difficult to make safe on a table saw. The riving knife has to be removed, increasing the chance of a kickback. The top guard may be difficult to position without the riving knife. Stopped grooves are impossible to guard. The HSE information sheet for table saws shows a tunnel "shaw guard" wihich includes a pressure plate to ensure the workpiece maintains contact with the table. The info sheet also says that stopped grooves should NOT be made on a table saw. See http://www.hse.gov.uk/pubns/wis16.pdf It is the responsibility of the employer to assess the guarding required and ensure it complies with PUWER, the supplier of the blade can argue that you may be using it in a fully automated and protected machine, hence his declaration. When you see these being used by Norm in the American series on Sky, you find that his machine is not braked, neither does it have any guards! Roly

Posted By Graeme Main Good morning Jim, Would it be possible for you to send me the picture you have spoken about in your posting. Kind regards Graeme