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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.
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Posted By Mitch
Graeme,
1. Yes.
2. No.
3. No.
Mitch
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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.
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Posted By water67.
Hi, As has been said you cant sign away legal duties, responsibilities or indeed rights. Seems to me this is an engineering problem.. requires an engineering solution. A simple change..left handed thread on the spindle and locking nut may prevent the braking from causing the nut to come loose.
Take it back to the maunfacturer.
Cheers.
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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.
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Posted By warderic
No you can't sign away your responsibilities. There are numerous requirements under the HSAWA section 6 and CE etc. A machine must be sold as safe to use. I think if you accept this machine knowing the problems and should things go wrong you will have legal problems. I do know that a company can sell you a secondhand machine with a written requirement for you to bring it up to the legal standard, but they must stipulate what needs to be done.Don't know if this could apply to new machinery.
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Posted By Graeme Main
Many thanks for the responses both on the forum and those that replied direct.
Regards
Graeme
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Posted By Jim Walker
Dado sets (for Table saws) are very common in USA, because of various EEC machine regs they are not sold in EEC.
Sounds like the supplier is a grey importer.
The trenching job (that Dado sets do) can be done better & safer either with a table mounted router or spindle moulder.
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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.pdfIt 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
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Posted By Jim Walker
Roly,
Not just me that cringes whilst watching (a coupla brads) Norm then.
The land of the free are just starting to come around to the idea of riving knifes & guards, I think.
I have a lovely photo of a lump of 2X2 sticking out of a blokes skull after a kick back on a table saw. Goes without saying its origin is USA.
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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
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