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Posted By Alex Ryding
Hi all, can anyone let me know about the requirements when enabling a machine with inch movement (jog)? We're about to buy equipment which has this facility, and I've been asked does the guarding needs to be locked during inch movement, or the guarding can be open? The only reference I can fine if in HSG43 robot safety with ref to speeds for programming robots. I want to check there is no definitive answer on this subject, otherwise - time to risk assess!
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Posted By holmezy
Alex,
without knowing the specific machine, its difficult to answer, however, most if not all cnc machines have a set up mode which allows the tables or heads to be "jogged" during machine set up. Speed of the tables are limited to 5m per min, and the cutting heads are also limited to 5rpm. Dont quote me on the speeds, cant remember them exactly but it is in some guidance somewhere. If the machine is in set up mode then generally it will be able to run with the guards or interlocks open. What you normally find is the set up mode is selected via a keyed switch, the key to which should be kept away from the machine in the supervisors office or similar. What normally happens is it stays in the machine allowing the operator to do whatever he wants!!
Holmezy
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Posted By Ron Hunter
Some print machines have a similar "inch" function for manual cleaning/setting of rollers I recall. Good resources on HSE website for Printing Industry. Process is certainly permitted.
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Posted By Mitch
All the machines we supply have the "inch" facility, controlled by a key switch. This is left in all the time for our use, of refurbishment and repair, as this is our core business and we have systems of work to cover this. Customers who use the machines for production have their own systems however, due to the nature of the textile industry I have not seen a key removed "for safe keeping" as it is required continuosly during the machine operation.
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Posted By Bruce Sutherland
Think you may find something in the power presses bit of PUWER - the separate book or look in the HSE Engineering Book - what you are looking for is the tool makers / press setters stuff ie the difference between a skilled craftsman and production. Historically the cases under the Factories Act s14 all about guarding were interpreted fairly fluidly so that in essence when you were inching you could "throw" away all the guards as the operative was competent and the machine not in "use".The woodworking part of puwer may also may give a steer - some of those machines are a pig to guard and it may take ages to build a false fence to do one operation - I think you will have to look outside the box to get your best answer
Cheers
Bruce
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Posted By Edward H
I may be jumping to entirely undeserved conclusions here, but it strikes me that you are approaching this from the wrong direction...
Surely the starting point should be identifying all of the operations that you will need to do on/with this machine, not just production but also setting, adjusting, cleaning and maintaining. Then go through all of those and identify whether there are any that cannot be reasonably done with the machine guarded. If there are, then you should consider whether there are any modifications, either to the machine or the work process, that would allow guards still to be used; if there are still tasks that need unguarded access then you will need to provide alternative safeguards to control the risks during those particular operations.
Jog/inch is just one 'tool' that can be used [often with other 'tools' like special training]to minimise risks during such tasks where it is ESSENTIAL that the machine is unguarded.
The term jog or inch is often misused: true jog/inch is safest, it will move the machine a small distance then stop when the button is pressed, the button has to be released and re-pressed to move it another 'inch'. Many jog controls are actually low speed, continuous motion hold-to-run controls.
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