"Origami" CNC Plasma Build - folding 1200 x 600mm cut area

A little bit of tapping and we have a hinged table top in perfect balance with gravity.  Been like that for hours, just sitting there.
LOL - what we do when we need a break from work/computer-screen.

 
 

Love it Joco.

Super creative solution to suit your needs.

I'm excited to see how this all goes. Not long and you will be making sparks.

A little bit of advice sought:  While I realise that plasma is a lot more tolerant on the accuracy front than other machines, just because it is not that a precise process. At least not the version of  the process we tend to be building. So, I am pondering the best order of construction:   linear rails v's water table.

(a) Do I get the linear rails on and reference their alignment to the top of the flip-table frame then move on to #B or
(b) Do I work on the water table and the slats, get that all created and into a mounting system inside the flip-table frame, looking to get as level/flat as possible then move to #A?

My concern is that once I have the linear rails in I then have to worry about getting the table top wll referenced to their plan. Where as it might easier to do the referencing the other way around.

BUT I plan to have a THCAD so in theory so long as nothing is binding up in motion and variances in the linear motion plane  against the water table tops plane would be accomodated by the continual adjustment of the THCAD.

Views on the correct order? Am I over thinking it again? Or some other method/approach I have not considered?

Thanks - James.

 

not much point getting too stressed about it until your slats are in. But in any case, the accuracy is not affected enough to bother with.
eg. If your table was 10mm higher at one end than the other, the dimensional error is  about 0.04mm and you can't really expect better than 0.1mm from plasma!

I would just get it moving for now and align it when the slats are in

Thanks Rod.  So if I am reading you correctly either way is fine so long as take some time to do some alignment against which ever is the fixed reference and to not get too hung up accuracy cose its not (as I noted) that accurate. i.e. if you get 0.1mm on plasma you are doing well.

Cheers.

I faced this same issue. So I went with adjustable slat holders meaning I could align to my gantry once it was all together. I think I saw this on someone else build and thought 'that is a sweet way to overcome a problem'.

I made adjustable holders for the slats, that way I'm able to adjust/level all the slats as required (so far this has been twice). I have replaced the slats 3 times now. Each slat has a few lives, right way up, upside down, moved from high cut area to low cut area, ground flat, until they are completely trashed. Slats are 50x3mm steel. 

On my table I think I have 5mm difference across 1200mm. However, with the new Mesa 7i96 and thcad10 it's irrelivant as this negats the difference. For perspective last night I cut some alluminium that had been creased for strength, it had a rise and fall of 15mm every 200mm. The thc meant that I could cut this and the torch followed maintaining perfect cut height (honestly it still amazes me).  

forum.linuxcnc.org/show-your-stuff/42411...a-cnc?start=0#207451
Pictures 3 & 4 show the adjustable holders.