I dont think your idea is a good practical idee for a production 
machine. The torch does touch off thousands of times and the loose nuts 
will wear out in no time. There is nothing wrong with a well designed 
floating head and in my opinion it is the best possible pactise to date.
I do call out service to cnc machines as part of my income and most of 
the problems that I attend to re badly designed or built mechanics on 
machines. Sometimes the electronics are not good but mostly mechanics.
I will leave you with his idee - Because a thing works once does not 
mean it will work well forever.


On 2012/11/10 02:51 AM, Tom Easterday wrote:
> Perhaps a drawing or something?  I am not following what you are proposing.  
> Sounds like you are talking about having a set up where the z-axis ball nut 
> (and hence the whole z-axis) is "sloppy" and can move 10-15mm up/down?  While 
> it might work (if that is what you are describing) then won't there be a lot 
> of slop in the actual movements of the whole axis and won't that effect other 
> movements such as adjustments in response to the THC during cutting?  Or 
> perhaps I totally misunderstand what you are saying....
> Tom
>
> On Nov 9, 2012, at 5:42 PM, Viesturs La-cis wrote:
>
>> Hello!
>>
>> Little too late but still - I suddenly realized that I need some
>> provisions for something similar to floating head for plasma torch.
>> I would like to ask plasma table owners to share their experience, how
>> they have solved the following issue:
>> Hypertherm (and most probably other manufacturers' as well) plasma
>> sources have a signal for cnc controller, when torch has touched the
>> material, which is used to probe the material surface and then retract
>> to pierce height. Since decelerating the plasma torch from the moment,
>> when touch is sensed, takes some time and distance of travel, some
>> provisions for that extra travel are needed.
>>
>> I have seen lots of videos on Youtube with floating torches, but there
>> are 2 things that keep me reserved about them:
>> 1) vast majority of them are not used with LinuxCNC
>> 2) they require additional construction - bearings etc that I would like to 
>> skip
>>
>> So the question is - how do other plasma table owners feel about my
>> superior invention of non-fixed fixture of Z axis ballscrew nut:
>> The basic concept is something like this - motor and ballscrew is
>> attached to Z axis, ballscrew nut is attached to Y axis. And I thought
>> that I could leave the screws, holding the ballscrew nut in place,
>> turned (sorry, I do not know the correct word for that) so that they
>> allow for something like 10 mm free travel of nut to accommodate the
>> deceleration distance. What I mean here is to have the Z axis balscrew
>> nut to lay on its support plate, have screws in place that do not
>> allow it to rotate, but that allow it to move extra 10-15 mm for the
>> situations, when torch has touched material and is not supposed to
>> move further in -Z direction.
>>
>> The question is - has anyone ever attempted something similar and are
>> there any potential issues that I am running into? I am not sure that
>> the nut will be so eager to slide along those screws and that the
>> whole concept would generally fail...
>>
>> -- 
>> Viesturs
>>
>> If you can't fix it, you don't own it.
>> http://www.ifixit.com/Manifesto
>>
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>
>

-- 
Regards / Groete

Marius D. Liebenberg
MasterCut cc
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